# Based on the Application Practice of Multifunctional Nanomaterials in Art Design and Industrial Manufacturing Concept

Authors: Wensi Cai; Yuze Li
Journal: Advances in Materials Science and Engineering
 (2022)

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## Abstract

Design is the broad application of discovering new materials and technologies. Nanomaterials have been widely used in product design as a new type of material. The rapid development of nanotechnology is bound to trigger a new design revolution. Combining user needs, design concepts, and material selection, this paper discusses the relationship between user needs and nanoproducts and user needs and nanomaterials. In this paper, the design requirements and related properties of nanomaterials are put forward through the study of the hydration rate of nanomaterials after adding cement, optical microscopy, scanning electron microscopy, and morphology analysis. The effect of the addition of ultrafine materials on the dissolution of ions during cement hydration was studied by ICP technology. The experimental results in this paper show that with the development of the distance, the concentration of calcium ions gradually decreases, and the order of calcium ion concentration is No. 3 tank > No. 4 tank > No. 5 tank. The diffusion of calcium ions was enhanced after the incorporation of nanomaterials, and the diffusion ability of NT to calcium ions was stronger than that of NS group.


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## Body

## 1. Introduction

With the increase of social demand and the continuous deepening of nanomaterials research, magnetic nanomaterials stand out from many nanomaterials due to their excellent magnetic properties and broad application prospects, which have attracted the attention of many scholars. In recent years, magnetic nanomaterials have emerged one after another and are widely used in magnetic separation, information storage, biomedicine, and other fields and have achieved fruitful results. After years of exploration and challenges, researchers on the nanometer road have gradually discovered that the synthesis of multifunctional nanomaterials with stable performance and wide operating range is of great meaning to the development of nanomaterials in the future. In a simple way, this places higher demands on the overall design of the material.With the continuous development and progress of the social economy, people have put forward higher-level requirements for the use of new materials in product design. Nanomaterials are a relatively new type of materials, which are more and more widely used in product design. However, when applying nanomaterials to product design, it is necessary to analyze the needs of users. On the basis of fully considering the needs of users, nanomaterials are reasonably used in product design to design products with both performance and appearance, win the love of users, and then increase the market share of products. With the industrialization of society, the development of urban science and technology, and the rapid development of infrastructure construction, the transformation of cement-based materials in industrial production has gradually become a hot topic in the field of building materials. In recent years, adding nanoparticles to cement mortar or concrete for better performance has become a research hotspot.The innovation of this paper lies in the application of multifunctional nanomaterials to the concept of art design and industrial manufacturing, which is innovative and experimental.


## 2. Related Work

More and more researchers are incorporating multifunctional nanomaterials into art design and industrial manufacturing concepts. Rzayev emphasized the ability of polymer brushes as highly adjustable building blocks for forming structural nanomaterials through molecular templates, solution aggregation, and melt self-assembly. He stressed recent research results in the synthesis of discrete nanoobjects, micelle structures, and periodic nanomaterials from bottle brush copolymers and provided a brief discussion of future opportunities for polymer science [1]. Smith and Gambhir address the physicochemical composition/design of nanomaterials through lenses of physical properties that produce contrast signals for homologous imaging modalities [2]. Using a combination of macrocanonical Monte Carlo (GCMC) simulations and ab initio QM calculations, Lithoxoos et al. investigated the H2 adsorption capacity of single-walled silicon nanotubes (SWSINT) in an armchair structural model [3]. Nanomaterials have been widely used as reagents for therapeutic and diagnostic (i.e., therapeutic) applications. Huang and Lovell’s efforts have turned from exploring new materials in vitro to engineering materials that work in more relevant animal disease models, increasing the likelihood of clinical translation [4]. Zheng et al. first described the mode of action of silver nanoparticles (Ag-NPs) in disrupting bacterial outer membranes and their intracellular components, which enables them to exhibit broad-spectrum antibacterial effects [5]. Sadegh et al. recall the role of nanomaterials as useful wastewater adsorbents [6]. Wang et al. reviewed the research status of nanostructured photocatalysts for water disinfection, including 0D, 1D, and 2D (low-dimensional) nanostructures. They systematically summarized and discussed its synthesis method, characterization, and photocatalytic bacterial inactivation performance. They particularly emphasized the development of new conceptual directions for natural materials, especially to accelerate practical industrial applications [7]. Poorly crystallized calcium silicate hydrate (C–S–H) is the main binding phase in Portland cement concrete. Li et al. investigated experimentally and systematically the impacts of adding anatase phase nanotitanium dioxide, silica nanoparticles, graphene oxide (GO), and multiwalled carbon nanotubes (CNT) on the co-crystallization and patterns of C–S–H [8]. However, the shortcomings of these studies are that the model construction is not scientific enough and the data is not well prepared to adapt to more complex situations.


## 3. Multifunctional Nanomaterials and Related Methods

### 3.1. Nanomaterials

#### 3.1.1. Definition of Nanomaterials

Nanomaterials refer to materials whose size ranges from 1 to 100 nm. Since nanomaterials have nanoscale sizes, in general, the properties of nanomaterials, such as physical properties, electrical properties, optical properties, and magnetic properties, are very significantly different from those of conventional materials. Many nanomaterials are catalytic, adsorptive, and highly reactive.


#### 3.1.2. Application of Nanomaterials

In the past few decades, nanomaterials have been extensively researched and developed, and have been successfully applied in the fields of catalysis, medicine, sensors, and biology. Nanomaterials have a relatively large specific surface area due to their small size, so they have strong adsorption capacity and reactivity. In particular, it has also received extensive attention in water treatment and wastewater treatment. Moreover, the flow properties of nanomaterials in solution are very high. It has been reported that heavy metals, organic pollutants, inorganic anions, and bacteria can be successfully removed by many kinds of nanomaterials [9].


#### 3.1.3. Application of Nanomaterials in Product Design

Figure1 shows the user requirements for using nanomaterials in product design.Figure 1
User requirements for using nanomaterials in product design.(1) Demand for Product Features. In terms of product demand, most users hope that the product has the functions of energy saving, environmental protection, cleanliness and sanitation, and speed. For example, nano toothpaste not only has the cleaning function of ordinary toothpaste, but also nano hydroxyapatite free in nano toothpaste can repair teeth. When using nano-zinc dioxide in the refrigerator coating, people require the refrigerator to have general refrigeration and insurance functions, as well as the functions of sterilization and bacteria inhibition, which can absorb peculiar smells caused by food deterioration and odor. In nano skin care products, in addition to the usual functions, skin care products should also have the function of reaching the deep layers of the skin and repairing damaged skin [10]. The application of car paint made of nanomaterials can enhance the hardness of the car surface and enhance the wear resistance of the paint. Moreover, the angle of visible light of nano-carbon dioxide will change with the change of sunlight, which can reduce light pollution. Nano-ceramic knives are “sharp” unmatched by ordinary props, and can meet people’s needs for knife functions [11].(2) Demand for Product Safety and Durability. People pay more attention to whether the product will cause harm to the body when using the product in recent years and put forward higher requirements for the safety of the product. The use of nanomaterials in product design can meet people’s requirements in this regard [12]. In products such as nano tooth sound, nano skin care products, nano clothes and pants, people’s skin and cells directly contact the products. At this time, people not only require the product to have functions that ordinary products do not have, but also require that the product will not produce side effects and will not damage the human body. For products that come into direct contact with food, such as nano cling film and nano knives, not only should they have commonly used functions, but they should also have no chemical reaction to cause food deterioration, or leave harmful substances on the surface of food, so as not to cause damage to the human body.(3) The Need for Product Portability. As we all know, nanomaterials have the characteristics of light weight, and products made of nanomaterials also have the characteristics of light weight, easy portability, and strong plasticity, which can meet people’s needs for portability. For example, the thickness of solar cells made of nanomaterials is only 2–6 nm, which is not only small, but also light and thin, and is very convenient to carry. Electronic display screens made of nanomaterials have good flexibility, light weight, and strong bending resistance, and users can carry them with them when they use them [13].


#### 3.1.4. The Characteristics of Using Nanomaterials in Product Design

A schematic diagram of the characteristics of using nanomaterials in product design is shown in Figure2.Figure 2
Characteristics of nanomaterials used in product design.(1) People Are More Demanding in terms of Product Performance Feedback. Due to the special properties of nanomaterials and the influence of small molecules, nanomaterials can directly penetrate into biological cells and produce effects. It is precisely because of the above characteristics that people put forward higher requirements on the “rapidity” of nanoproducts; that is, compared with ordinary products, nanoproducts should quickly perform the functions that people need [14]. For example, by adding nanomaterials to the device for loosening drugs, the drug can quickly pass through the skin surface, reach the body’s circulation, and quickly exert the function of treating diseases. The feedback time is long, which is favored by most people.(2) Nano Products Are “Fine.” The size of nanomaterials is small, and the products made by using nanomaterials are also relatively small, allowing users to accurately grasp the relevant laws of the onlooker world. For another example, a drug delivery device made of nanomaterials is smaller in size than red blood cells so that the drug can lead to corresponding cells through blood circulation and achieve the effect of saving and curing people. This nano-drug delivery device does not damage healthy cells and can relieve the pain of patients during the treatment process [15].(3) Paying Attention to the Physical Structure of Nanomaterials in the Design of Nanoproducts. The structure used in the aforementioned nanodrug delivery device is a nano-multi-walled carbon tube half-deep cup structure. When treating cancer patients, related drugs can be put into the deep cup. For example, the fineness of nanometer is one ten millionth of that of hair, and it has good toughness and elasticity. In medical virus research, the virus is attached to the top of the nanoscale, and the weight of the virus can be recorded according to the amplitude of the weighing rod so as to facilitate the identification of the virus and then research drugs or methods based on this.(4) Nanoproducts Pursue Cleanliness and Hygiene. In the clean and hygienic functions of nanoproducts, it mainly includes the following two aspects: first, the products made of nanomaterials can prevent pollution and dust by themselves; second, some nanomaterials have the function of sterilization. These characteristics of nanomaterials are mainly determined by the following conditions: first, the molecules of nanomaterials are extremely small, and the scale is smaller than that of dust particles, so that dust particles cannot adhere to the surface of nanomaterials, resulting in a “lotus effect” and self-purification effect. Secondly, nanomaterials have photocatalytic effects [16]. Under the condition of light, the chemical activity of nanomaterials will be enhanced, and redox reactions will occur with the organic matter attached to its surface so that the organic matter becomes water or CO2 achieves the decontamination effect [17].(5) It Has Special Mechanical Properties. Due to the influence of mechanical properties, ordinary knives are relatively brittle and are often chipped or even broken during use. Adding nanomaterials to the tool can effectively increase the toughness and elasticity of the tool. The application of nano-zinc dioxide to spray the surface of the refrigerator can enhance the firmness of the refrigerator and prolong the service time of the refrigerator.


#### 3.1.5. Application-Oriented Products of Nanomaterials

Knives are tools that are often used in the kitchen. As shown in Figure3(c), nano-ceramic knives are knives made of nanomaterials, which are so called because they are similar to ceramics. The main raw material for making nano-ceramic knives is nano-zirconia. Nano-zirconia has no heavy metal components contained in ordinary knives, is non-toxic, safe, and does not have any adverse effects on the human body [18].Figure 3
Applied products of nanomaterials. (a) Nano waterproof material, (b) nano titanium dioxide car paint, (c) nano-ceramic cutting tool, and (d) nano-refrigerator coating.
(a)(b)(c)(d)As shown in Figure3(d), the refrigerator is most frequently used in daily life, and people are accustomed to stuffing all kinds of food into this small space. But over time, this leads to spoilage of food and odors between different foods; refrigerators are easy to breed germs (bacteria) and produce unpleasant odors. The general treatment method is to regularly clean and clean the refrigerator to keep it in a clean state. The refrigerator coated with nano-ZnO can effectively solve this headache. The refrigerator has effective bactericidal and bacteriostatic functions, which can effectively reduce the growth of bacteria in food and reduce unpleasant odors.Nano-titanium dioxide is nontoxic and harmless, has good compatibility with automobile paint, and has good transparency to visible light. Due to its high refractive index and high luminescent activity, it can absorb UV radiation and thus is a good automotive colorant [19], as shown in Figure 3(b).


#### 3.1.6. Synthesis of Nanomaterials

The preparation methods of nanomaterials can be roughly divided into physical methods, chemical methods, and other methods. Among them, physical methods include pulverization method, deposition method, and sputtering method. Chemical methods include sol-gel method, precipitation method, evaporative solvent pyrolysis method, redox method, and solvothermal method. Figure4 is a method for preparing nanoparticles.Figure 4
Nanoparticle preparation method.


#### 3.1.7. Characterization of Nanomaterials

In order to explore the mysteries of the nano-world, the structure and properties of nanoparticles must be characterized. The characterization of nanomaterials is the modern analysis and detection technology and related theoretical knowledge about particle composition, structure, morphology, and so on. Usually, we use inductively coupled plasma emission spectroscopy (ICP-AES), scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) to obtain the composition, particle size, morphology, structure, and interface of nanoparticles to characterize materials. The average particle size, particle size distribution, composition, and interface of nanomaterials all affect their physicochemical properties. Figure5 shows the commonly used characterization methods for nanomaterials.Figure 5
Nanomaterials characterization techniques.


### 3.2. BP Neural Network Algorithm

The historical summary of neural network development can be divided into four stages, namely, the enlightenment period from 1891 to 1968, the low tide period from 1968 to 1981, the revival period from 1981 to 1985, and the occurrence period of the new era from 1985 to the present. The neural network has experienced several periods of development and continuous improvement, and there are currently more than 40 neural network models [20]. Among them, the more typical neural networks are adaptive resonance theory networks network, back propagation neural network (BP neural network), cellular neural network, multilayer forward propagation network (BOP network), and so on.Artificial neural network is a highly nonlinear dynamic system with the ability of self-organization, self-adaptation, and parallel information processing, so it has been widely used in intelligent control, intelligent information processing, and other fields. With the continuous development of industrial production and agricultural engineering at the current stage, the objects in control become more and more complex, which requires matching with higher control requirements. The traditional control methods can no longer meet the requirements of industrial production and agricultural engineering control at the present stage. With the continuous in-depth study of control theory and a large number of theories used in practice, this makes the control theory develop in a more perfect direction, which requires some intelligent control algorithms and theories to be applied to it. The rapid development and application of neural network has made people pay more attention and research on it.


#### 3.2.1. The Establishment of BP Neural Network

The structure diagram of the BP neural network PID control system designed in this paper is as follows: a 3-layer BP neural network is used (Figure6). Its structure is as follows: 4 input neurons, 5 intermediate layer neurons, and 3 output layer neurons. The selection of neurons in the output layer is the adjustment parameters Sq,Su,So of the PID.Figure 6
Forward neural network model.


#### 3.2.2. Forward Propagation Process

According to the designed network, the input and output of each layer can be obtained.The input and output of the network input layer are(1)HT1=ATT=1,2,3.4.The input and output of the hidden layer of the network are(2)netu2S=∑TDKuv2HT1,(3)Hu2S=gnetu2Su=1,2,3,4,5.Among them,Kuv2 is the weighting coefficient of the hidden layer.The input and output of the network output layer are(4)netL3S=∑u=0DKuv3Hu2S,(5)HL2S=gnetL3SL=1,2,3.Among them, (1), (2), and (3) are used to represent each layer of the network.Since this paper studies the direction of chlorination process control, it can be determined that the output of the network is three adjustable parametersSq、Su、So, and the activation function of the output layer neurons is selected as a nonnegative sigmoid function:(6)H13S=Sq,(7)H23S=Su,(8)H33S=So,(9)fA=eAeA+e−A.


#### 3.2.3. Backpropagation Process

Selecting the output performance indicator function of the network is as follows:(10)ES=12rinkS−youtS2.The weight correction function of the network adjusts the weight coefficient of the network according to the gradient descent method in the core correction process of the BP neural network. That is, the weighting coefficient is adjusted in the negative direction according to the output performance index function value, and in order to prevent the network from falling into a local minimum, a learning rateη is added, and a global minimum inertia term is used to quickly converge the search.(11)ΔKLu3S=−η∂ES∂KLu3+αΔKuv3S−1.Among them,α is the inertia coefficient.The partial derivatives for the correction function are as follows:(12)∂ES∂KLu3=∂ES∂BS•∂BS∂ΔWS•∂ΔWS∂HL3S•∂HL3S∂netL3S•∂netL3S∂Kuv3S,(13)∂netL3S∂Kuv3S=Hu2S.Among them,∂BS/∂ΔWS cannot be known. This paper decides to use its sign function to approximate replacement by consulting relevant information so that the learning rate η is adjusted for calculation compensation [21].From the above calculation, the modified partial derivative formula of each output neuron can be obtained:(14)∂ΔWS∂H13S=eS−eS−1,(15)∂ΔWS∂H23S=eS,(16)∂ΔWS∂H13S=eS−2eS−1+eS−2.The learning algorithm for synthesizing the weights of the output layer of the available network is(17)ΔKLu3S=αΔKLu3S−1+ηδL3HL2S,(18)δL3=eSsgn∂BS∂ΔWS•∂ΔWS∂HL3Sf′netL3S.


### 3.3. Basic Principles of Convolutional Neural Networks

Convolutional Neural Network (CNN), as the name suggests, should come from neuroscience or biology, and it does. At present, CNN has a wide range of applications and has made outstanding contributions in many application directions, but the most interesting research field is the field of image processing [22]. The basic principles of CNN in image processing are described in detail below. Figure 7 shows the simplest structure of a typical convolutional neural network. The input image is color, can be expressed in the form of RGB three-channel, and the size can be expressed as 3 × 28 × 28. After convolution and pooling, it finally reaches the fully connected layer. After the fully connected layer, a classification function, such as Softmax, can be connected.Figure 7
Schematic diagram of the basic principle of convolutional neural network.First and foremost, to a machine (computer, etc.), each image is a sequence of points (pixels) in a specific order. If the order or color of the pixels is changed, the image also changes. Basically, the machine transforms the pixels of the image into a matrix and stores the color code for each locus pixel. So, every image the machine “sees” is a matrix of numbers. According to this principle, we can represent the image in the form of a digital matrix for the machine to recognize. Since different pictures will form different digital matrices, the computer can easily recognize it. So how to effectively represent the image in the form of a digital matrix and make the machine recognize it in a simple, efficient, and feasible way. After several generations of scientists’ efforts, the convolutional neural network (CNN) came into being [23].Convolutional neural networks are different from ordinary neural networks. Their main difference is that convolutional neural networks have a feature extractor, which consists of convolutional layers and subsampling layers. A convolutional layer of a convolutional neural network often contains multiple feature planes (Feature Map), and there are multiple neuron components on each feature plane, and these components are arranged in a rectangle [24].


## 3.1. Nanomaterials

### 3.1.1. Definition of Nanomaterials

Nanomaterials refer to materials whose size ranges from 1 to 100 nm. Since nanomaterials have nanoscale sizes, in general, the properties of nanomaterials, such as physical properties, electrical properties, optical properties, and magnetic properties, are very significantly different from those of conventional materials. Many nanomaterials are catalytic, adsorptive, and highly reactive.


### 3.1.2. Application of Nanomaterials

In the past few decades, nanomaterials have been extensively researched and developed, and have been successfully applied in the fields of catalysis, medicine, sensors, and biology. Nanomaterials have a relatively large specific surface area due to their small size, so they have strong adsorption capacity and reactivity. In particular, it has also received extensive attention in water treatment and wastewater treatment. Moreover, the flow properties of nanomaterials in solution are very high. It has been reported that heavy metals, organic pollutants, inorganic anions, and bacteria can be successfully removed by many kinds of nanomaterials [9].


### 3.1.3. Application of Nanomaterials in Product Design

Figure1 shows the user requirements for using nanomaterials in product design.Figure 1
User requirements for using nanomaterials in product design.(1) Demand for Product Features. In terms of product demand, most users hope that the product has the functions of energy saving, environmental protection, cleanliness and sanitation, and speed. For example, nano toothpaste not only has the cleaning function of ordinary toothpaste, but also nano hydroxyapatite free in nano toothpaste can repair teeth. When using nano-zinc dioxide in the refrigerator coating, people require the refrigerator to have general refrigeration and insurance functions, as well as the functions of sterilization and bacteria inhibition, which can absorb peculiar smells caused by food deterioration and odor. In nano skin care products, in addition to the usual functions, skin care products should also have the function of reaching the deep layers of the skin and repairing damaged skin [10]. The application of car paint made of nanomaterials can enhance the hardness of the car surface and enhance the wear resistance of the paint. Moreover, the angle of visible light of nano-carbon dioxide will change with the change of sunlight, which can reduce light pollution. Nano-ceramic knives are “sharp” unmatched by ordinary props, and can meet people’s needs for knife functions [11].(2) Demand for Product Safety and Durability. People pay more attention to whether the product will cause harm to the body when using the product in recent years and put forward higher requirements for the safety of the product. The use of nanomaterials in product design can meet people’s requirements in this regard [12]. In products such as nano tooth sound, nano skin care products, nano clothes and pants, people’s skin and cells directly contact the products. At this time, people not only require the product to have functions that ordinary products do not have, but also require that the product will not produce side effects and will not damage the human body. For products that come into direct contact with food, such as nano cling film and nano knives, not only should they have commonly used functions, but they should also have no chemical reaction to cause food deterioration, or leave harmful substances on the surface of food, so as not to cause damage to the human body.(3) The Need for Product Portability. As we all know, nanomaterials have the characteristics of light weight, and products made of nanomaterials also have the characteristics of light weight, easy portability, and strong plasticity, which can meet people’s needs for portability. For example, the thickness of solar cells made of nanomaterials is only 2–6 nm, which is not only small, but also light and thin, and is very convenient to carry. Electronic display screens made of nanomaterials have good flexibility, light weight, and strong bending resistance, and users can carry them with them when they use them [13].


### 3.1.4. The Characteristics of Using Nanomaterials in Product Design

A schematic diagram of the characteristics of using nanomaterials in product design is shown in Figure2.Figure 2
Characteristics of nanomaterials used in product design.(1) People Are More Demanding in terms of Product Performance Feedback. Due to the special properties of nanomaterials and the influence of small molecules, nanomaterials can directly penetrate into biological cells and produce effects. It is precisely because of the above characteristics that people put forward higher requirements on the “rapidity” of nanoproducts; that is, compared with ordinary products, nanoproducts should quickly perform the functions that people need [14]. For example, by adding nanomaterials to the device for loosening drugs, the drug can quickly pass through the skin surface, reach the body’s circulation, and quickly exert the function of treating diseases. The feedback time is long, which is favored by most people.(2) Nano Products Are “Fine.” The size of nanomaterials is small, and the products made by using nanomaterials are also relatively small, allowing users to accurately grasp the relevant laws of the onlooker world. For another example, a drug delivery device made of nanomaterials is smaller in size than red blood cells so that the drug can lead to corresponding cells through blood circulation and achieve the effect of saving and curing people. This nano-drug delivery device does not damage healthy cells and can relieve the pain of patients during the treatment process [15].(3) Paying Attention to the Physical Structure of Nanomaterials in the Design of Nanoproducts. The structure used in the aforementioned nanodrug delivery device is a nano-multi-walled carbon tube half-deep cup structure. When treating cancer patients, related drugs can be put into the deep cup. For example, the fineness of nanometer is one ten millionth of that of hair, and it has good toughness and elasticity. In medical virus research, the virus is attached to the top of the nanoscale, and the weight of the virus can be recorded according to the amplitude of the weighing rod so as to facilitate the identification of the virus and then research drugs or methods based on this.(4) Nanoproducts Pursue Cleanliness and Hygiene. In the clean and hygienic functions of nanoproducts, it mainly includes the following two aspects: first, the products made of nanomaterials can prevent pollution and dust by themselves; second, some nanomaterials have the function of sterilization. These characteristics of nanomaterials are mainly determined by the following conditions: first, the molecules of nanomaterials are extremely small, and the scale is smaller than that of dust particles, so that dust particles cannot adhere to the surface of nanomaterials, resulting in a “lotus effect” and self-purification effect. Secondly, nanomaterials have photocatalytic effects [16]. Under the condition of light, the chemical activity of nanomaterials will be enhanced, and redox reactions will occur with the organic matter attached to its surface so that the organic matter becomes water or CO2 achieves the decontamination effect [17].(5) It Has Special Mechanical Properties. Due to the influence of mechanical properties, ordinary knives are relatively brittle and are often chipped or even broken during use. Adding nanomaterials to the tool can effectively increase the toughness and elasticity of the tool. The application of nano-zinc dioxide to spray the surface of the refrigerator can enhance the firmness of the refrigerator and prolong the service time of the refrigerator.


### 3.1.5. Application-Oriented Products of Nanomaterials

Knives are tools that are often used in the kitchen. As shown in Figure3(c), nano-ceramic knives are knives made of nanomaterials, which are so called because they are similar to ceramics. The main raw material for making nano-ceramic knives is nano-zirconia. Nano-zirconia has no heavy metal components contained in ordinary knives, is non-toxic, safe, and does not have any adverse effects on the human body [18].Figure 3
Applied products of nanomaterials. (a) Nano waterproof material, (b) nano titanium dioxide car paint, (c) nano-ceramic cutting tool, and (d) nano-refrigerator coating.
(a)(b)(c)(d)As shown in Figure3(d), the refrigerator is most frequently used in daily life, and people are accustomed to stuffing all kinds of food into this small space. But over time, this leads to spoilage of food and odors between different foods; refrigerators are easy to breed germs (bacteria) and produce unpleasant odors. The general treatment method is to regularly clean and clean the refrigerator to keep it in a clean state. The refrigerator coated with nano-ZnO can effectively solve this headache. The refrigerator has effective bactericidal and bacteriostatic functions, which can effectively reduce the growth of bacteria in food and reduce unpleasant odors.Nano-titanium dioxide is nontoxic and harmless, has good compatibility with automobile paint, and has good transparency to visible light. Due to its high refractive index and high luminescent activity, it can absorb UV radiation and thus is a good automotive colorant [19], as shown in Figure 3(b).


### 3.1.6. Synthesis of Nanomaterials

The preparation methods of nanomaterials can be roughly divided into physical methods, chemical methods, and other methods. Among them, physical methods include pulverization method, deposition method, and sputtering method. Chemical methods include sol-gel method, precipitation method, evaporative solvent pyrolysis method, redox method, and solvothermal method. Figure4 is a method for preparing nanoparticles.Figure 4
Nanoparticle preparation method.


### 3.1.7. Characterization of Nanomaterials

In order to explore the mysteries of the nano-world, the structure and properties of nanoparticles must be characterized. The characterization of nanomaterials is the modern analysis and detection technology and related theoretical knowledge about particle composition, structure, morphology, and so on. Usually, we use inductively coupled plasma emission spectroscopy (ICP-AES), scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) to obtain the composition, particle size, morphology, structure, and interface of nanoparticles to characterize materials. The average particle size, particle size distribution, composition, and interface of nanomaterials all affect their physicochemical properties. Figure5 shows the commonly used characterization methods for nanomaterials.Figure 5
Nanomaterials characterization techniques.


## 3.1.1. Definition of Nanomaterials

Nanomaterials refer to materials whose size ranges from 1 to 100 nm. Since nanomaterials have nanoscale sizes, in general, the properties of nanomaterials, such as physical properties, electrical properties, optical properties, and magnetic properties, are very significantly different from those of conventional materials. Many nanomaterials are catalytic, adsorptive, and highly reactive.


## 3.1.2. Application of Nanomaterials

In the past few decades, nanomaterials have been extensively researched and developed, and have been successfully applied in the fields of catalysis, medicine, sensors, and biology. Nanomaterials have a relatively large specific surface area due to their small size, so they have strong adsorption capacity and reactivity. In particular, it has also received extensive attention in water treatment and wastewater treatment. Moreover, the flow properties of nanomaterials in solution are very high. It has been reported that heavy metals, organic pollutants, inorganic anions, and bacteria can be successfully removed by many kinds of nanomaterials [9].


## 3.1.3. Application of Nanomaterials in Product Design

Figure1 shows the user requirements for using nanomaterials in product design.Figure 1
User requirements for using nanomaterials in product design.(1) Demand for Product Features. In terms of product demand, most users hope that the product has the functions of energy saving, environmental protection, cleanliness and sanitation, and speed. For example, nano toothpaste not only has the cleaning function of ordinary toothpaste, but also nano hydroxyapatite free in nano toothpaste can repair teeth. When using nano-zinc dioxide in the refrigerator coating, people require the refrigerator to have general refrigeration and insurance functions, as well as the functions of sterilization and bacteria inhibition, which can absorb peculiar smells caused by food deterioration and odor. In nano skin care products, in addition to the usual functions, skin care products should also have the function of reaching the deep layers of the skin and repairing damaged skin [10]. The application of car paint made of nanomaterials can enhance the hardness of the car surface and enhance the wear resistance of the paint. Moreover, the angle of visible light of nano-carbon dioxide will change with the change of sunlight, which can reduce light pollution. Nano-ceramic knives are “sharp” unmatched by ordinary props, and can meet people’s needs for knife functions [11].(2) Demand for Product Safety and Durability. People pay more attention to whether the product will cause harm to the body when using the product in recent years and put forward higher requirements for the safety of the product. The use of nanomaterials in product design can meet people’s requirements in this regard [12]. In products such as nano tooth sound, nano skin care products, nano clothes and pants, people’s skin and cells directly contact the products. At this time, people not only require the product to have functions that ordinary products do not have, but also require that the product will not produce side effects and will not damage the human body. For products that come into direct contact with food, such as nano cling film and nano knives, not only should they have commonly used functions, but they should also have no chemical reaction to cause food deterioration, or leave harmful substances on the surface of food, so as not to cause damage to the human body.(3) The Need for Product Portability. As we all know, nanomaterials have the characteristics of light weight, and products made of nanomaterials also have the characteristics of light weight, easy portability, and strong plasticity, which can meet people’s needs for portability. For example, the thickness of solar cells made of nanomaterials is only 2–6 nm, which is not only small, but also light and thin, and is very convenient to carry. Electronic display screens made of nanomaterials have good flexibility, light weight, and strong bending resistance, and users can carry them with them when they use them [13].


## 3.1.4. The Characteristics of Using Nanomaterials in Product Design

A schematic diagram of the characteristics of using nanomaterials in product design is shown in Figure2.Figure 2
Characteristics of nanomaterials used in product design.(1) People Are More Demanding in terms of Product Performance Feedback. Due to the special properties of nanomaterials and the influence of small molecules, nanomaterials can directly penetrate into biological cells and produce effects. It is precisely because of the above characteristics that people put forward higher requirements on the “rapidity” of nanoproducts; that is, compared with ordinary products, nanoproducts should quickly perform the functions that people need [14]. For example, by adding nanomaterials to the device for loosening drugs, the drug can quickly pass through the skin surface, reach the body’s circulation, and quickly exert the function of treating diseases. The feedback time is long, which is favored by most people.(2) Nano Products Are “Fine.” The size of nanomaterials is small, and the products made by using nanomaterials are also relatively small, allowing users to accurately grasp the relevant laws of the onlooker world. For another example, a drug delivery device made of nanomaterials is smaller in size than red blood cells so that the drug can lead to corresponding cells through blood circulation and achieve the effect of saving and curing people. This nano-drug delivery device does not damage healthy cells and can relieve the pain of patients during the treatment process [15].(3) Paying Attention to the Physical Structure of Nanomaterials in the Design of Nanoproducts. The structure used in the aforementioned nanodrug delivery device is a nano-multi-walled carbon tube half-deep cup structure. When treating cancer patients, related drugs can be put into the deep cup. For example, the fineness of nanometer is one ten millionth of that of hair, and it has good toughness and elasticity. In medical virus research, the virus is attached to the top of the nanoscale, and the weight of the virus can be recorded according to the amplitude of the weighing rod so as to facilitate the identification of the virus and then research drugs or methods based on this.(4) Nanoproducts Pursue Cleanliness and Hygiene. In the clean and hygienic functions of nanoproducts, it mainly includes the following two aspects: first, the products made of nanomaterials can prevent pollution and dust by themselves; second, some nanomaterials have the function of sterilization. These characteristics of nanomaterials are mainly determined by the following conditions: first, the molecules of nanomaterials are extremely small, and the scale is smaller than that of dust particles, so that dust particles cannot adhere to the surface of nanomaterials, resulting in a “lotus effect” and self-purification effect. Secondly, nanomaterials have photocatalytic effects [16]. Under the condition of light, the chemical activity of nanomaterials will be enhanced, and redox reactions will occur with the organic matter attached to its surface so that the organic matter becomes water or CO2 achieves the decontamination effect [17].(5) It Has Special Mechanical Properties. Due to the influence of mechanical properties, ordinary knives are relatively brittle and are often chipped or even broken during use. Adding nanomaterials to the tool can effectively increase the toughness and elasticity of the tool. The application of nano-zinc dioxide to spray the surface of the refrigerator can enhance the firmness of the refrigerator and prolong the service time of the refrigerator.


## 3.1.5. Application-Oriented Products of Nanomaterials

Knives are tools that are often used in the kitchen. As shown in Figure3(c), nano-ceramic knives are knives made of nanomaterials, which are so called because they are similar to ceramics. The main raw material for making nano-ceramic knives is nano-zirconia. Nano-zirconia has no heavy metal components contained in ordinary knives, is non-toxic, safe, and does not have any adverse effects on the human body [18].Figure 3
Applied products of nanomaterials. (a) Nano waterproof material, (b) nano titanium dioxide car paint, (c) nano-ceramic cutting tool, and (d) nano-refrigerator coating.
(a)(b)(c)(d)As shown in Figure3(d), the refrigerator is most frequently used in daily life, and people are accustomed to stuffing all kinds of food into this small space. But over time, this leads to spoilage of food and odors between different foods; refrigerators are easy to breed germs (bacteria) and produce unpleasant odors. The general treatment method is to regularly clean and clean the refrigerator to keep it in a clean state. The refrigerator coated with nano-ZnO can effectively solve this headache. The refrigerator has effective bactericidal and bacteriostatic functions, which can effectively reduce the growth of bacteria in food and reduce unpleasant odors.Nano-titanium dioxide is nontoxic and harmless, has good compatibility with automobile paint, and has good transparency to visible light. Due to its high refractive index and high luminescent activity, it can absorb UV radiation and thus is a good automotive colorant [19], as shown in Figure 3(b).


## 3.1.6. Synthesis of Nanomaterials

The preparation methods of nanomaterials can be roughly divided into physical methods, chemical methods, and other methods. Among them, physical methods include pulverization method, deposition method, and sputtering method. Chemical methods include sol-gel method, precipitation method, evaporative solvent pyrolysis method, redox method, and solvothermal method. Figure4 is a method for preparing nanoparticles.Figure 4
Nanoparticle preparation method.


## 3.1.7. Characterization of Nanomaterials

In order to explore the mysteries of the nano-world, the structure and properties of nanoparticles must be characterized. The characterization of nanomaterials is the modern analysis and detection technology and related theoretical knowledge about particle composition, structure, morphology, and so on. Usually, we use inductively coupled plasma emission spectroscopy (ICP-AES), scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) to obtain the composition, particle size, morphology, structure, and interface of nanoparticles to characterize materials. The average particle size, particle size distribution, composition, and interface of nanomaterials all affect their physicochemical properties. Figure5 shows the commonly used characterization methods for nanomaterials.Figure 5
Nanomaterials characterization techniques.


## 3.2. BP Neural Network Algorithm

The historical summary of neural network development can be divided into four stages, namely, the enlightenment period from 1891 to 1968, the low tide period from 1968 to 1981, the revival period from 1981 to 1985, and the occurrence period of the new era from 1985 to the present. The neural network has experienced several periods of development and continuous improvement, and there are currently more than 40 neural network models [20]. Among them, the more typical neural networks are adaptive resonance theory networks network, back propagation neural network (BP neural network), cellular neural network, multilayer forward propagation network (BOP network), and so on.Artificial neural network is a highly nonlinear dynamic system with the ability of self-organization, self-adaptation, and parallel information processing, so it has been widely used in intelligent control, intelligent information processing, and other fields. With the continuous development of industrial production and agricultural engineering at the current stage, the objects in control become more and more complex, which requires matching with higher control requirements. The traditional control methods can no longer meet the requirements of industrial production and agricultural engineering control at the present stage. With the continuous in-depth study of control theory and a large number of theories used in practice, this makes the control theory develop in a more perfect direction, which requires some intelligent control algorithms and theories to be applied to it. The rapid development and application of neural network has made people pay more attention and research on it.


### 3.2.1. The Establishment of BP Neural Network

The structure diagram of the BP neural network PID control system designed in this paper is as follows: a 3-layer BP neural network is used (Figure6). Its structure is as follows: 4 input neurons, 5 intermediate layer neurons, and 3 output layer neurons. The selection of neurons in the output layer is the adjustment parameters Sq,Su,So of the PID.Figure 6
Forward neural network model.


### 3.2.2. Forward Propagation Process

According to the designed network, the input and output of each layer can be obtained.The input and output of the network input layer are(1)HT1=ATT=1,2,3.4.The input and output of the hidden layer of the network are(2)netu2S=∑TDKuv2HT1,(3)Hu2S=gnetu2Su=1,2,3,4,5.Among them,Kuv2 is the weighting coefficient of the hidden layer.The input and output of the network output layer are(4)netL3S=∑u=0DKuv3Hu2S,(5)HL2S=gnetL3SL=1,2,3.Among them, (1), (2), and (3) are used to represent each layer of the network.Since this paper studies the direction of chlorination process control, it can be determined that the output of the network is three adjustable parametersSq、Su、So, and the activation function of the output layer neurons is selected as a nonnegative sigmoid function:(6)H13S=Sq,(7)H23S=Su,(8)H33S=So,(9)fA=eAeA+e−A.


### 3.2.3. Backpropagation Process

Selecting the output performance indicator function of the network is as follows:(10)ES=12rinkS−youtS2.The weight correction function of the network adjusts the weight coefficient of the network according to the gradient descent method in the core correction process of the BP neural network. That is, the weighting coefficient is adjusted in the negative direction according to the output performance index function value, and in order to prevent the network from falling into a local minimum, a learning rateη is added, and a global minimum inertia term is used to quickly converge the search.(11)ΔKLu3S=−η∂ES∂KLu3+αΔKuv3S−1.Among them,α is the inertia coefficient.The partial derivatives for the correction function are as follows:(12)∂ES∂KLu3=∂ES∂BS•∂BS∂ΔWS•∂ΔWS∂HL3S•∂HL3S∂netL3S•∂netL3S∂Kuv3S,(13)∂netL3S∂Kuv3S=Hu2S.Among them,∂BS/∂ΔWS cannot be known. This paper decides to use its sign function to approximate replacement by consulting relevant information so that the learning rate η is adjusted for calculation compensation [21].From the above calculation, the modified partial derivative formula of each output neuron can be obtained:(14)∂ΔWS∂H13S=eS−eS−1,(15)∂ΔWS∂H23S=eS,(16)∂ΔWS∂H13S=eS−2eS−1+eS−2.The learning algorithm for synthesizing the weights of the output layer of the available network is(17)ΔKLu3S=αΔKLu3S−1+ηδL3HL2S,(18)δL3=eSsgn∂BS∂ΔWS•∂ΔWS∂HL3Sf′netL3S.


## 3.2.1. The Establishment of BP Neural Network

The structure diagram of the BP neural network PID control system designed in this paper is as follows: a 3-layer BP neural network is used (Figure6). Its structure is as follows: 4 input neurons, 5 intermediate layer neurons, and 3 output layer neurons. The selection of neurons in the output layer is the adjustment parameters Sq,Su,So of the PID.Figure 6
Forward neural network model.


## 3.2.2. Forward Propagation Process

According to the designed network, the input and output of each layer can be obtained.The input and output of the network input layer are(1)HT1=ATT=1,2,3.4.The input and output of the hidden layer of the network are(2)netu2S=∑TDKuv2HT1,(3)Hu2S=gnetu2Su=1,2,3,4,5.Among them,Kuv2 is the weighting coefficient of the hidden layer.The input and output of the network output layer are(4)netL3S=∑u=0DKuv3Hu2S,(5)HL2S=gnetL3SL=1,2,3.Among them, (1), (2), and (3) are used to represent each layer of the network.Since this paper studies the direction of chlorination process control, it can be determined that the output of the network is three adjustable parametersSq、Su、So, and the activation function of the output layer neurons is selected as a nonnegative sigmoid function:(6)H13S=Sq,(7)H23S=Su,(8)H33S=So,(9)fA=eAeA+e−A.


## 3.2.3. Backpropagation Process

Selecting the output performance indicator function of the network is as follows:(10)ES=12rinkS−youtS2.The weight correction function of the network adjusts the weight coefficient of the network according to the gradient descent method in the core correction process of the BP neural network. That is, the weighting coefficient is adjusted in the negative direction according to the output performance index function value, and in order to prevent the network from falling into a local minimum, a learning rateη is added, and a global minimum inertia term is used to quickly converge the search.(11)ΔKLu3S=−η∂ES∂KLu3+αΔKuv3S−1.Among them,α is the inertia coefficient.The partial derivatives for the correction function are as follows:(12)∂ES∂KLu3=∂ES∂BS•∂BS∂ΔWS•∂ΔWS∂HL3S•∂HL3S∂netL3S•∂netL3S∂Kuv3S,(13)∂netL3S∂Kuv3S=Hu2S.Among them,∂BS/∂ΔWS cannot be known. This paper decides to use its sign function to approximate replacement by consulting relevant information so that the learning rate η is adjusted for calculation compensation [21].From the above calculation, the modified partial derivative formula of each output neuron can be obtained:(14)∂ΔWS∂H13S=eS−eS−1,(15)∂ΔWS∂H23S=eS,(16)∂ΔWS∂H13S=eS−2eS−1+eS−2.The learning algorithm for synthesizing the weights of the output layer of the available network is(17)ΔKLu3S=αΔKLu3S−1+ηδL3HL2S,(18)δL3=eSsgn∂BS∂ΔWS•∂ΔWS∂HL3Sf′netL3S.


## 3.3. Basic Principles of Convolutional Neural Networks

Convolutional Neural Network (CNN), as the name suggests, should come from neuroscience or biology, and it does. At present, CNN has a wide range of applications and has made outstanding contributions in many application directions, but the most interesting research field is the field of image processing [22]. The basic principles of CNN in image processing are described in detail below. Figure 7 shows the simplest structure of a typical convolutional neural network. The input image is color, can be expressed in the form of RGB three-channel, and the size can be expressed as 3 × 28 × 28. After convolution and pooling, it finally reaches the fully connected layer. After the fully connected layer, a classification function, such as Softmax, can be connected.Figure 7
Schematic diagram of the basic principle of convolutional neural network.First and foremost, to a machine (computer, etc.), each image is a sequence of points (pixels) in a specific order. If the order or color of the pixels is changed, the image also changes. Basically, the machine transforms the pixels of the image into a matrix and stores the color code for each locus pixel. So, every image the machine “sees” is a matrix of numbers. According to this principle, we can represent the image in the form of a digital matrix for the machine to recognize. Since different pictures will form different digital matrices, the computer can easily recognize it. So how to effectively represent the image in the form of a digital matrix and make the machine recognize it in a simple, efficient, and feasible way. After several generations of scientists’ efforts, the convolutional neural network (CNN) came into being [23].Convolutional neural networks are different from ordinary neural networks. Their main difference is that convolutional neural networks have a feature extractor, which consists of convolutional layers and subsampling layers. A convolutional layer of a convolutional neural network often contains multiple feature planes (Feature Map), and there are multiple neuron components on each feature plane, and these components are arranged in a rectangle [24].


## 4. Experimentation of Multifunctional Nanometers for Industrial Manufacturing Ideas

### 4.1. The Effect of Nanoparticles on the Hydration Process of Industrially Manufactured Cement

In order to better reflect the influence of different nanoparticles on the cement hydration process in this experiment,SiO2 nanoparticles with a particle size of 20 nm and TiO2 nanoparticles with a particle size of 10 nm were selected. In order to reduce the influence of impurities in cement, Portland cement with less impurities is selected. The mineral composition of Portland cement is shown in Table 1. In order to reflect the hydration reaction of cement under the condition of different dosages of nanoparticles, three different dosages were selected for the two nanomaterials, which were 0.1 wt%, 1 wt%, and 5 wt%, respectively (the dosage in this experiment is relative to the mass of water). In order to clearly observe the hydration growth process of cement particles, the water-cement ratio was set to 10 : 1. The mix ratio design is shown in Table 1 [25].Table 1
Mix design of water-cement ratio.
SampleCement (g)Water (g)NS or NT (%)10Pure330010NS0.1%3300.110NS1%330110NS5%330510NS0.1%3300.110NS1%330110NS5%3305


### 4.2. Scanning Electron Microscope Observation of Cement Hydration Products

In this experiment, in order to observe the morphology of cement hydration products more clearly, a higher water-cement ratio W/B = 10 : 1 was selected. At the same time, the influence of nanomaterials on the early hydration of cement is relatively significant, so the early 12 h, 24 h, and 3 d were selected as the age for the comparison of the morphology of the hydration products. In order to better illustrate the effect of nanomaterials on the hydration ofC3S, three additional groups of C3S hydration groups without nanomaterials and those with nanomaterials were additionally set. The mix design of this experiment is shown in Table 2.Table 2
Test mix ratio of tricalcium silicate and Portland cement hydration products with different nano-content materials.
SampleW/BC3SCementNSNTC3SPure100.6 g———C3SNS1%100.6 g—1%—C3SNT1%100.6 g——1%CPure10—5 g——CNS1%10—5 g1%—CNS5%10—5 g6%—CNT1%10—5 g—1%CNT5%10—5 g—6%


### 4.3. Test Process

The calcium ion concentrations in the five tanks at each time point were accumulated to obtain the dissolution amount of calcium ions during the cement hydration process. Figure8(a) shows the dissolved calcium ion concentration at three time points during the hydration process of Portland cement doped with different nanomaterials. The three samples were the blank group without nanomaterials, the group with 1% NS, and the group with 1% NT. The three time periods are 5 min, 15 min, and 30 min in the early stage. It can be found that after the dissolution time of 5 min, the dissolved calcium ion concentration in the group doped with nanomaterials is higher than that in the control group. The dissolved concentration of the NS group was 2.38 times that of the control group, while the dissolved concentration of the NT group was 1.63 times that of the control group. It can be seen that the dissolution effect of NS on calcium ions is better than that of NT. However, at 15 min, the calcium ion concentrations of the control group and NT group were basically the same, while the calcium ion concentration of the NS group did not change with the concentration at 5 min. It can be found that, during this period, the dissolution rate of calcium ions in the NS group was basically balanced with its reaction rate, while the rate of dissolution of calcium ions in the NT group was significantly lower than that of the control group. At 30 min, the calcium ion concentration decreased significantly due to the reaction between NS and calcium ions, and the dissolution rate of calcium ions in the control group was still higher than that in the NT group.Figure 8
Cement ion dissolution and calcium ion diffusion rate diagram. (a) The concentration of calcium ions dissolved in cement hydration with different nanomaterials. (b) The diffusion rate of calcium hydrate in cement doped with different nanomaterials.
(a)(b)The measured calcium ion concentration was simultaneously scaled up to the undiluted concentration for comparison. Figure8(b) is the concentration of calcium ion diffusion during the hydration process of cement mixed with different nanomaterials at 5 min. The three groups represent the undoped nanomaterial group, the 1% NS doped group, and the 1% NT doped group, respectively. The reaction times are 5 min, 15 min, and 30 min, respectively. Since both the No. 1 and No. 2 tanks contain the migration of cement particles, the No. 3, No. 4, and No. 5 tanks are selected as the calibration tanks for ion diffusion. It can be seen that with the increase of distance, the concentration of calcium ions gradually decreases, and the order of calcium ion concentration is slot 3> slot 4> slot 5. The diffusion of calcium ions was enhanced after the incorporation of nanomaterials, and the diffusion ability of NT to calcium ions was stronger than that of NS group.


## 4.1. The Effect of Nanoparticles on the Hydration Process of Industrially Manufactured Cement

In order to better reflect the influence of different nanoparticles on the cement hydration process in this experiment,SiO2 nanoparticles with a particle size of 20 nm and TiO2 nanoparticles with a particle size of 10 nm were selected. In order to reduce the influence of impurities in cement, Portland cement with less impurities is selected. The mineral composition of Portland cement is shown in Table 1. In order to reflect the hydration reaction of cement under the condition of different dosages of nanoparticles, three different dosages were selected for the two nanomaterials, which were 0.1 wt%, 1 wt%, and 5 wt%, respectively (the dosage in this experiment is relative to the mass of water). In order to clearly observe the hydration growth process of cement particles, the water-cement ratio was set to 10 : 1. The mix ratio design is shown in Table 1 [25].Table 1
Mix design of water-cement ratio.
SampleCement (g)Water (g)NS or NT (%)10Pure330010NS0.1%3300.110NS1%330110NS5%330510NS0.1%3300.110NS1%330110NS5%3305


## 4.2. Scanning Electron Microscope Observation of Cement Hydration Products

In this experiment, in order to observe the morphology of cement hydration products more clearly, a higher water-cement ratio W/B = 10 : 1 was selected. At the same time, the influence of nanomaterials on the early hydration of cement is relatively significant, so the early 12 h, 24 h, and 3 d were selected as the age for the comparison of the morphology of the hydration products. In order to better illustrate the effect of nanomaterials on the hydration ofC3S, three additional groups of C3S hydration groups without nanomaterials and those with nanomaterials were additionally set. The mix design of this experiment is shown in Table 2.Table 2
Test mix ratio of tricalcium silicate and Portland cement hydration products with different nano-content materials.
SampleW/BC3SCementNSNTC3SPure100.6 g———C3SNS1%100.6 g—1%—C3SNT1%100.6 g——1%CPure10—5 g——CNS1%10—5 g1%—CNS5%10—5 g6%—CNT1%10—5 g—1%CNT5%10—5 g—6%


## 4.3. Test Process

The calcium ion concentrations in the five tanks at each time point were accumulated to obtain the dissolution amount of calcium ions during the cement hydration process. Figure8(a) shows the dissolved calcium ion concentration at three time points during the hydration process of Portland cement doped with different nanomaterials. The three samples were the blank group without nanomaterials, the group with 1% NS, and the group with 1% NT. The three time periods are 5 min, 15 min, and 30 min in the early stage. It can be found that after the dissolution time of 5 min, the dissolved calcium ion concentration in the group doped with nanomaterials is higher than that in the control group. The dissolved concentration of the NS group was 2.38 times that of the control group, while the dissolved concentration of the NT group was 1.63 times that of the control group. It can be seen that the dissolution effect of NS on calcium ions is better than that of NT. However, at 15 min, the calcium ion concentrations of the control group and NT group were basically the same, while the calcium ion concentration of the NS group did not change with the concentration at 5 min. It can be found that, during this period, the dissolution rate of calcium ions in the NS group was basically balanced with its reaction rate, while the rate of dissolution of calcium ions in the NT group was significantly lower than that of the control group. At 30 min, the calcium ion concentration decreased significantly due to the reaction between NS and calcium ions, and the dissolution rate of calcium ions in the control group was still higher than that in the NT group.Figure 8
Cement ion dissolution and calcium ion diffusion rate diagram. (a) The concentration of calcium ions dissolved in cement hydration with different nanomaterials. (b) The diffusion rate of calcium hydrate in cement doped with different nanomaterials.
(a)(b)The measured calcium ion concentration was simultaneously scaled up to the undiluted concentration for comparison. Figure8(b) is the concentration of calcium ion diffusion during the hydration process of cement mixed with different nanomaterials at 5 min. The three groups represent the undoped nanomaterial group, the 1% NS doped group, and the 1% NT doped group, respectively. The reaction times are 5 min, 15 min, and 30 min, respectively. Since both the No. 1 and No. 2 tanks contain the migration of cement particles, the No. 3, No. 4, and No. 5 tanks are selected as the calibration tanks for ion diffusion. It can be seen that with the increase of distance, the concentration of calcium ions gradually decreases, and the order of calcium ion concentration is slot 3> slot 4> slot 5. The diffusion of calcium ions was enhanced after the incorporation of nanomaterials, and the diffusion ability of NT to calcium ions was stronger than that of NS group.


## 5. Discussion

Nanomaterials are one-dimensional (0.1∼100 nm) materials in three-dimensional space. Nanomaterials have attracted more and more attention due to their advantages such as nanometer size effect, quantum effect, surface effect, and interface effect [26]. Through the natural effects of these nanomaterials, nanomaterials have unique properties in the fields of mechanics, heat, optics, and electromagnetism.Since the early 1980s, nanomaterials have been known as “the most promising materials in the twenty-first century,” and together with information technology and biotechnology, they have become one of the three pillars and strategic commanding heights of social and economic development in the twenty-first century. At present, the product design industry has achieved extensive development. In the process of product design, more and more designers apply nanomaterials to it, which largely meets the needs of users for products.Nanoparticles, as a nanomaterial, have a high surface area, and they are not fully coordinated on the particle surface, thereby increasing the active centers on the surface. The combination of nanotechnology and biotechnology gives rise to nanotechnology and uses nanotechnology to solve biological problems.


## 6. Conclusions

In this paper, the effects of two nanomaterials on cement hydration rate, hydration product morphology, and ion dissolution and diffusion were compared. The main results are as follows: effects of adding two different nanomaterials on cement hydration rate, hydration products, hydration ion solubility, and ion diffusion capacity. The main test method used in this paper is to observe the effects of different dosages of nanomaterials on the hydration rate of Portland cement by using a super-depth optical digital microscope. In this paper, scanning electron microscopy was used to observe the effect of different nanomaterials on the morphology of hydration products of tricalcium silicate and Portland cement. In this paper, the plasma emission spectrometer was used to detect the effect of different nanomaterials on the ion dissolution and ion diffusion ability of Portland cement.



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*Source: 1653828-2022-08-27.xml*