# Preparation of High-Refractive-Index Flexible Nanoparticle Laser Engraving Materials and Micro-Nano Sculpture Art

Authors: Zhilei Guo; Liling Huang; Li Tian
Journal: Advances in Materials Science and Engineering
 (2022)

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## Abstract

The continuous development of nanotechnology has brought new trends of thought and new impetus to sculpture art. In the field of microengraving, people usually use two-photon engraving technology, but not every particle conforms to the engraving process. ZnO nanoparticles have a high refractive index and are extremely flexible, making them the material of choice for laser engraving. This article aims to investigate whether the incorporation of high-refractive-index flexible nanoparticles into engraving techniques can significantly improve the functional properties of products. This paper firstly introduces the preparation methods of common nanoparticle laser engraving materials and then describes simple micro-nano sculptures on this basis. Finally, experiments on the transmittance and refractive index of ZnO nanoparticles are carried out. The experimental results show that the refractive index and transmittance of this material are 1.7 and 1.039, respectively, which is very suitable for laser engraving.


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## Body

## 1. Introduction

Two-photon engraving technology has an extremely wide range of applications in nanoparticle engraving, mainly because it can engrave many fine three-dimensional structures. In electronic products, we usually see many precision parts and ingenious designs. In fact, most of these are realized by two-photon engraving technology. However, the products engraved by this technology often lack flexibility, and the product features are greatly reduced in terms of product functions. Therefore, how to improve the functionality of engraving products is the current research hotspot. ZnO nanoparticles have good refractive index and flexibility, and incorporating them into the engraving technology is bound to improve the functional properties of the product. In particular, in terms of micro-nano sculpture, the particle-based sculpture technology can add masterpieces to the field of sculpture art. Under the blessing of new technology, micro-nano sculpture art will surely achieve great development and continuously inject new vitality into the field of art. Moreover, the particles are sensitive to light and light perception, and we can make extremely sensitive light sensing devices using this technology.The innovations of this paper are as follows:(1)
The article innovatively introduces ZnO nanoparticles and proposes a laser engraving technology based on this. It is believed that it can bring some inspiration to the traditional laser engraving technology and promote the development of the entire industry.(2)
The article starts with technology and finally returns into reality. The article innovatively combines micro-nano sculpture art and to a certain extent innovates its carving techniques, which is bound to bring new development to the entire art industry.


## 2. Related Work

Many scholars have provided a lot of references for the research on nanoparticles, laser engraving materials, flexible nanoparticles with high refractive index, and micro-nano sculpture art.Gajrani and Ravi Sankar first reviewed the research progress of micro-nano technology in the field of cutting tools and then proposed that the application of special nanotextures on the rake face and flank face of metal cutting tools may reduce the force coefficient during the cutting process. At the same time, they also pointed out that nanotexture also has the ability to improve sliding friction performance [1].Zhang et al. proposed a plasmonic resonance-based infrared laser sensor and improved the refractive index and sensitivity of the sensor using nanoparticles. On this basis, they designed a new type of nanoparticle sensor, which theoretically studied the optical properties of nanoparticles in the entire near-infrared band [2].Yang et al. proposed a QD film based on poly(zinc methacrylate) coating on the basis of the original QD film. The high-refractive-index BaTiO3 nanoparticles were applied in the coating, which improved the scattering coefficient of the QD film to a certain extent. At the same time, they also provided ideas for the development of quantum dot optical films with high scattering and enhanced light for flexible displays [3].Jiang et al. pointed out that the ability to control surface wettability and liquid diffusion on textured surfaces is of interest. They proposed a simple method to fabricate flexible hydrophobic smart coatings using graphene-polymer films. In this film, an array of individual patterns was created by laser engraving, and the contact angle of the small droplets was controlled by fixing the contact lines within a horizontal stretch range of 0–200% [4].Mirkhalaf and Zreiqat pointed out that materials with dense structures can be fabricated by laser engraving. Examples of these materials include engineered structures such as vaults and highly mineralized natural materials such as tooth enamel. At the same time, they also pointed out that the micromechanics of the obtained materials have certain applications in stretching, bending, fracture, puncture, and impact [5].Hu et al. proposed a strain energy function to obtain the thermal coupling constitutive relation of thermoelastic materials. At the same time, they also designed a high-temperature measurement system, using the digital image correlation (DIC) method to obtain the mechanical properties of magnesium alloys at high temperatures. At the same time, a new laser engraving technique was also applied to the surface of magnesium alloy samples to generate speckle patterns [6].Sun et al. pointed out that a class of pure inorganic metal iodides is a promising X-ray detection material which can directly realize photon-to-charge conversion and has the potential to develop a practical flexible X-ray detector. Among them, elements with higher atomic numbers tend to have higher absorption coefficients and larger band gaps. Therefore, they pointed out that X-ray detectors can be upgraded with high atomic number elements [7].


## 3. Nanoparticle Laser Engraving and Micro-Nano Sculpture Art

### 3.1. Nanoparticles

Before discussing nanoparticles, many people tend to think of nanotechnology first. This is because the size and volume of nanoparticles are too small, so people often cannot form an intuitive understanding of them [8, 9].Nanotechnology is a new type of microscopic technology based on countless modern science and technology. In the scientific community, people are accustomed to referring to nanotechnology as dynamic science and technology, because nanotechnology is a constantly evolving technology, and once it is combined with technologies from other disciplines, there is a high probability of a new transsubject technology [10, 11]. At the same time, nanotechnology is a very comprehensive technology. The development of nanotechnology has been closely related to seven major disciplines and three disciplines. Nanoparticles generally refer to particles with a size between 1 and 100 nm, and their shape under a microscope is shown in Figure 1. Because of their special size and shape, nanoparticles possess special properties and unique effects that many substances do not have [12, 13]. Nanoparticles have been widely used in various fields since their birth, and their main application fields are shown in Figure 2.Figure 1
Nanoparticle map.Figure 2
Nanoparticle application fields.The unique effects and properties of nanoparticles are mainly as follows.


#### 3.1.1. Surface Effect

Although nanoparticles are relatively small, they can also be regarded as spheres themselves. According to the formula for calculating the area of a sphere, we find that the volume of a sphere is proportional to its diameter [14]. However, there are certain differences between particles and spheres. When the diameter of particles reaches the nanometer level, their volume and area will not shrink and will increase rapidly. The area characteristics of particles different from spheres are summarized as surface effect, and, under the influence of this effect, the surface of particles has great tension and activity. The activity of the surface atoms not only causes the changes of atomic transport and configuration on the surface of the nanoparticle but also causes the changes of the surface electron spin conformation and electron energy spectrum.


#### 3.1.2. Quantum Size Effect

Due to the existence of certain tension and activity on the surface of the particle, the distance between it and other particles changes accordingly. To sum up, when the volume of a particle is larger, the distance between it and other particles is smaller, and the smaller the volume of a particle is, the larger the distance between it and other particles is [15]. This opposite property of ordinary objects is called the quantum size effect of particles.


#### 3.1.3. Small Size Effect

In philosophy, the principle of quantitative change and qualitative change tells us that the accumulation of quantitative change will lead to qualitative change [16]. This is manifested in nanoparticles; that is, the quantitative change of particle size will also produce qualitative change of particle properties to a certain extent. Since this is a change in the size of the particle itself, people define this property as a small size effect.


#### 3.1.4. Macroscopic Quantum Tunneling Effect

The ability of microscopic particles to penetrate a potential barrier is called tunneling. In recent years, it has been found that some macroscopic quantities, such as the magnetization of microparticles, the magnetic flux in quantum coherent devices, and the electric charge, also have tunneling effects. They can change through the potential barrier of the macroscopic system, so it is called the macroscopic quantum tunneling effect. This effect, together with the quantum size effect, defines the limits of further miniaturization of microelectronic devices and also limits the minimum time for information storage using magnetic tape and disk.Because nanoparticles have many excellent properties, people have researched nanomaterials on this basis. After discussing nanoparticles, we will next focus on nanomaterials. The material is a special material composed of nanoparticles, which has three main characteristics: light, strong, and high. The so-called lightness means that the volume and size of nanomaterials are very small, so the products made of this material are generally lighter in quality. Strong means that nanomaterials have stronger electrical, light, and thermal conductivity than general physical materials. High means that nanomaterials are far superior to other materials in various properties. At present, nanomaterials are mainly divided into four categories: nanopowder, nanofiber, nanofilm, and nanoblock. Among them, scientists have the earliest research on nanopowder, so the preparation technology of nanopowder is the most mature, and it is also an important basis for the production of three other nanomaterials.Below we will give a brief introduction to these four nanomaterials [17].Nanopowder: Nanopowder is also known as ultrafine powder. The main reason why it is called ultramicro is because it is a solid particulate material in an intermediate state between atoms, molecules, and macroscopic objects. This nanomaterial is also one of the most widely used, and it is mainly used in the fields of electronics and optics.Nanofibers: On the basis of nanopowders, people have upgraded the technology and proposed nanofibers. Nanofibers are currently mainly the basic materials for electronic wires and network fibers.Nanomembrane: Like nanofibers, nanomembranes are also developed on the basis of nanopowders. Among them, nanofilms are mainly divided into particle films and dense films. At present, nanofilms are mainly used for the production of photocatalysis and photosensitive materials.Nanobulk: Nanobulk is a material made directly from nanopowders. At present, nanoblocks are mainly used in the production of ultrahigh-strength and ultrahigh-density materials. Nanosurface atoms often lack adjacent atoms and have many dangling bonds, so they have unsaturated properties. At the same time, nanoscientists also pointed out that the current scientific community’s understanding of nanomaterials has just begun, and little is known at present. But there is no doubt that nanoparticles are a very promising and attractive field. At the same time, the current development of nanomaterials will provide mankind with unprecedented intelligent nanomaterials [18].


### 3.2. Nanoparticle Laser Engraving

Before studying nanoparticle laser engraving technology, we first need to have an understanding of laser engraving technology. Laser engraving technology is an interdisciplinary technology based on numerical control technology and using laser as the medium. Laser engraving technology uses lasers to engrave and strike objects. In the course of the development of this technology, laser engraving has continuously derived new features [19]. First of all, laser engraving can ignore the surface characteristics and material of the processing material, so laser engraving has the characteristics of high speed, simple operation, and high precision. It is precisely because of the many characteristics of laser engraving technology that its application field is no longer the traditional numerical control and electronic fields. After the development of modern microscopic technology, people combined laser engraving technology with nanotechnology to derive a new nanoparticle laser engraving technology. However, people generally have a misunderstanding about nanoparticle engraving; that is, they think that the strength and hardness of the particles cannot achieve engraving and that this technology is an unfeasible technology [20].In the middle of the 20th century, Swiss scientists successfully used nanoparticle laser engraving technology to achieve engraving on copper plates, and this technology was really recognized by people. The general laser engraving technology is mainly composed of three parts, and the nanoparticle technology engraving technology is composed of two parts, namely high-energy particles and particle transmission units.After the emergence of laser engraving technology, people generally believe that light is a very magical and energetic thing. After the birth of nanoparticle laser engraving technology, nanoparticles are also full of mystery and energy like light.With the development of nanotechnology, as well as the unique effect of nanoparticle itself, its appearance has caused a huge impact on the traditional carving industry and art industry. Among them, the most serious impact is the miniaturization of art works. In terms of figure sculpture, many miniature and miniaturized works of art have appeared under the influence of nanotechnology, such as the nuclear boat recorded in the Qing Dynasty, the thinker carved by British masters, and the Statue of Liberty copied by Italian scholars. The earliest applications of laser engraving on nanoparticles began in the late 20th century [21]. In this period, people simply arranged and combined the particles and did not discover the unique properties of the particles, so there were few laser engraving works of art in that period, and there were not many representative mature works of art. In modern times, scientists have mastered this skill proficiently, and many carving techniques have been derived from it. Figure 3 is its basic operation flow.Figure 3
Nanoparticle laser engraving process.However, since the development of nanoparticle laser engraving, many engraving methods have emerged, such as nanoparticle printing. Different methods often have different advantages and disadvantages, and, after using different methods for engraving, the artistic works produced by people are also different [4]. Table 1 is a comparison of different nanoparticle laser engraving methods.Table 1
Comparison of nanoparticle laser engraving methods.
CategoryPreparation principleAdvantageDisadvantageDNA foldingSculpting DNA into a shape with particlesSmall size, mature technologyNeed patiencePrinting technologyAllow nanoparticles to build up on surfaces and guide them into a certain shapeTechnology is similar to printing technologyHigh requirements for equipmentMicro contact printing technologyEmbedding particles into objects with lamination materialEmbedded operationLamination material is relatively rareFreeze dryingFreeze particles into solids that maintain a certain shapeSimple to implementStrict temperature controlAtmospheric dryingThe particles are contracted by the tension on the surface of the objectOnly need special solvents to achieveSide effects of solvents


### 3.3. Micro and Nano Sculpture Art

Sculpture, also known as carving, can be traced back to ancient times. Before the microscopic world appeared in people’s field of vision, sculpture only referred to artistic creation in the macroscopic world. By fully expressing their emotions on a variety of moldable materials, people turn originally messy materials into artworks one after another [5]. The artistic characteristics of sculpture are mainly as follows.


#### 3.3.1. 3D Solids

Traditional sculpture generally sculpts solid objects in three-dimensional space, and the final product is often a three-dimensional entity [6]. Under the influence of the physical object, the first thing people pay attention to is its shape. The shape, size, and posture of the entity are all people’s intuitive feelings about the physical object.


#### 3.3.2. Feelings Vary from Person to Person

Sculpture is an important medium for artists to express their feelings. However, because each person wants to express different emotions, their life experiences are also different, so people’s emotions towards sculpture will also be different [11]. In the beauty conveyed by sculpture, people understand the image of sculpture through their own perception of beauty.


#### 3.3.3. Rich Expressiveness

Although there is only one entity, sculpture has rich expressive power [22]. On the one hand, sculpture emphasizes a subjective spirit, so everyone can get a certain emotional expression from it. In the process, the sculpture is also expressing its own emotions. Sculpture, on the other hand, is an aesthetic. Aesthetic object differences will also be reflected in the sculpture itself and have an impact on the expressiveness of the sculpture.


#### 3.3.4. Sufficient Sense of Volume

Sculptures are generally made of bronze or marble. Therefore, they generally do not rely on color to win but problems are solved in terms of volume, and primary and secondary contradictions are resolved in terms of volume. Sculpture is often prioritized by how its salient points are organized.After possessing the above-mentioned numerous carving techniques, people are no longer satisfied with the carving of traditional products, and finally people turn their attention to the art of micro-nano sculpture. But, for ordinary people, the micro-nano world is too microscopic to appreciate. Later, with the advent of microscopes, the world in micro-nano was first revealed to people’s eyes. Figure4 is a nanoimage under a microscope. The figure is a petal-like crystal composed of nanoparticles and an animal-like shape composed of countless particles. In modern times, with the help of advanced technology and high-power microscopes, most scientific artists have been able to write their own chapters in the micro-nano world. After this, micro-nano technology and art have been continuously integrated, and science and art have finally achieved the same frame in reality.Figure 4
Micro-nano sculpture.


## 3.1. Nanoparticles

Before discussing nanoparticles, many people tend to think of nanotechnology first. This is because the size and volume of nanoparticles are too small, so people often cannot form an intuitive understanding of them [8, 9].Nanotechnology is a new type of microscopic technology based on countless modern science and technology. In the scientific community, people are accustomed to referring to nanotechnology as dynamic science and technology, because nanotechnology is a constantly evolving technology, and once it is combined with technologies from other disciplines, there is a high probability of a new transsubject technology [10, 11]. At the same time, nanotechnology is a very comprehensive technology. The development of nanotechnology has been closely related to seven major disciplines and three disciplines. Nanoparticles generally refer to particles with a size between 1 and 100 nm, and their shape under a microscope is shown in Figure 1. Because of their special size and shape, nanoparticles possess special properties and unique effects that many substances do not have [12, 13]. Nanoparticles have been widely used in various fields since their birth, and their main application fields are shown in Figure 2.Figure 1
Nanoparticle map.Figure 2
Nanoparticle application fields.The unique effects and properties of nanoparticles are mainly as follows.


### 3.1.1. Surface Effect

Although nanoparticles are relatively small, they can also be regarded as spheres themselves. According to the formula for calculating the area of a sphere, we find that the volume of a sphere is proportional to its diameter [14]. However, there are certain differences between particles and spheres. When the diameter of particles reaches the nanometer level, their volume and area will not shrink and will increase rapidly. The area characteristics of particles different from spheres are summarized as surface effect, and, under the influence of this effect, the surface of particles has great tension and activity. The activity of the surface atoms not only causes the changes of atomic transport and configuration on the surface of the nanoparticle but also causes the changes of the surface electron spin conformation and electron energy spectrum.


### 3.1.2. Quantum Size Effect

Due to the existence of certain tension and activity on the surface of the particle, the distance between it and other particles changes accordingly. To sum up, when the volume of a particle is larger, the distance between it and other particles is smaller, and the smaller the volume of a particle is, the larger the distance between it and other particles is [15]. This opposite property of ordinary objects is called the quantum size effect of particles.


### 3.1.3. Small Size Effect

In philosophy, the principle of quantitative change and qualitative change tells us that the accumulation of quantitative change will lead to qualitative change [16]. This is manifested in nanoparticles; that is, the quantitative change of particle size will also produce qualitative change of particle properties to a certain extent. Since this is a change in the size of the particle itself, people define this property as a small size effect.


### 3.1.4. Macroscopic Quantum Tunneling Effect

The ability of microscopic particles to penetrate a potential barrier is called tunneling. In recent years, it has been found that some macroscopic quantities, such as the magnetization of microparticles, the magnetic flux in quantum coherent devices, and the electric charge, also have tunneling effects. They can change through the potential barrier of the macroscopic system, so it is called the macroscopic quantum tunneling effect. This effect, together with the quantum size effect, defines the limits of further miniaturization of microelectronic devices and also limits the minimum time for information storage using magnetic tape and disk.Because nanoparticles have many excellent properties, people have researched nanomaterials on this basis. After discussing nanoparticles, we will next focus on nanomaterials. The material is a special material composed of nanoparticles, which has three main characteristics: light, strong, and high. The so-called lightness means that the volume and size of nanomaterials are very small, so the products made of this material are generally lighter in quality. Strong means that nanomaterials have stronger electrical, light, and thermal conductivity than general physical materials. High means that nanomaterials are far superior to other materials in various properties. At present, nanomaterials are mainly divided into four categories: nanopowder, nanofiber, nanofilm, and nanoblock. Among them, scientists have the earliest research on nanopowder, so the preparation technology of nanopowder is the most mature, and it is also an important basis for the production of three other nanomaterials.Below we will give a brief introduction to these four nanomaterials [17].Nanopowder: Nanopowder is also known as ultrafine powder. The main reason why it is called ultramicro is because it is a solid particulate material in an intermediate state between atoms, molecules, and macroscopic objects. This nanomaterial is also one of the most widely used, and it is mainly used in the fields of electronics and optics.Nanofibers: On the basis of nanopowders, people have upgraded the technology and proposed nanofibers. Nanofibers are currently mainly the basic materials for electronic wires and network fibers.Nanomembrane: Like nanofibers, nanomembranes are also developed on the basis of nanopowders. Among them, nanofilms are mainly divided into particle films and dense films. At present, nanofilms are mainly used for the production of photocatalysis and photosensitive materials.Nanobulk: Nanobulk is a material made directly from nanopowders. At present, nanoblocks are mainly used in the production of ultrahigh-strength and ultrahigh-density materials. Nanosurface atoms often lack adjacent atoms and have many dangling bonds, so they have unsaturated properties. At the same time, nanoscientists also pointed out that the current scientific community’s understanding of nanomaterials has just begun, and little is known at present. But there is no doubt that nanoparticles are a very promising and attractive field. At the same time, the current development of nanomaterials will provide mankind with unprecedented intelligent nanomaterials [18].


## 3.1.1. Surface Effect

Although nanoparticles are relatively small, they can also be regarded as spheres themselves. According to the formula for calculating the area of a sphere, we find that the volume of a sphere is proportional to its diameter [14]. However, there are certain differences between particles and spheres. When the diameter of particles reaches the nanometer level, their volume and area will not shrink and will increase rapidly. The area characteristics of particles different from spheres are summarized as surface effect, and, under the influence of this effect, the surface of particles has great tension and activity. The activity of the surface atoms not only causes the changes of atomic transport and configuration on the surface of the nanoparticle but also causes the changes of the surface electron spin conformation and electron energy spectrum.


## 3.1.2. Quantum Size Effect

Due to the existence of certain tension and activity on the surface of the particle, the distance between it and other particles changes accordingly. To sum up, when the volume of a particle is larger, the distance between it and other particles is smaller, and the smaller the volume of a particle is, the larger the distance between it and other particles is [15]. This opposite property of ordinary objects is called the quantum size effect of particles.


## 3.1.3. Small Size Effect

In philosophy, the principle of quantitative change and qualitative change tells us that the accumulation of quantitative change will lead to qualitative change [16]. This is manifested in nanoparticles; that is, the quantitative change of particle size will also produce qualitative change of particle properties to a certain extent. Since this is a change in the size of the particle itself, people define this property as a small size effect.


## 3.1.4. Macroscopic Quantum Tunneling Effect

The ability of microscopic particles to penetrate a potential barrier is called tunneling. In recent years, it has been found that some macroscopic quantities, such as the magnetization of microparticles, the magnetic flux in quantum coherent devices, and the electric charge, also have tunneling effects. They can change through the potential barrier of the macroscopic system, so it is called the macroscopic quantum tunneling effect. This effect, together with the quantum size effect, defines the limits of further miniaturization of microelectronic devices and also limits the minimum time for information storage using magnetic tape and disk.Because nanoparticles have many excellent properties, people have researched nanomaterials on this basis. After discussing nanoparticles, we will next focus on nanomaterials. The material is a special material composed of nanoparticles, which has three main characteristics: light, strong, and high. The so-called lightness means that the volume and size of nanomaterials are very small, so the products made of this material are generally lighter in quality. Strong means that nanomaterials have stronger electrical, light, and thermal conductivity than general physical materials. High means that nanomaterials are far superior to other materials in various properties. At present, nanomaterials are mainly divided into four categories: nanopowder, nanofiber, nanofilm, and nanoblock. Among them, scientists have the earliest research on nanopowder, so the preparation technology of nanopowder is the most mature, and it is also an important basis for the production of three other nanomaterials.Below we will give a brief introduction to these four nanomaterials [17].Nanopowder: Nanopowder is also known as ultrafine powder. The main reason why it is called ultramicro is because it is a solid particulate material in an intermediate state between atoms, molecules, and macroscopic objects. This nanomaterial is also one of the most widely used, and it is mainly used in the fields of electronics and optics.Nanofibers: On the basis of nanopowders, people have upgraded the technology and proposed nanofibers. Nanofibers are currently mainly the basic materials for electronic wires and network fibers.Nanomembrane: Like nanofibers, nanomembranes are also developed on the basis of nanopowders. Among them, nanofilms are mainly divided into particle films and dense films. At present, nanofilms are mainly used for the production of photocatalysis and photosensitive materials.Nanobulk: Nanobulk is a material made directly from nanopowders. At present, nanoblocks are mainly used in the production of ultrahigh-strength and ultrahigh-density materials. Nanosurface atoms often lack adjacent atoms and have many dangling bonds, so they have unsaturated properties. At the same time, nanoscientists also pointed out that the current scientific community’s understanding of nanomaterials has just begun, and little is known at present. But there is no doubt that nanoparticles are a very promising and attractive field. At the same time, the current development of nanomaterials will provide mankind with unprecedented intelligent nanomaterials [18].


## 3.2. Nanoparticle Laser Engraving

Before studying nanoparticle laser engraving technology, we first need to have an understanding of laser engraving technology. Laser engraving technology is an interdisciplinary technology based on numerical control technology and using laser as the medium. Laser engraving technology uses lasers to engrave and strike objects. In the course of the development of this technology, laser engraving has continuously derived new features [19]. First of all, laser engraving can ignore the surface characteristics and material of the processing material, so laser engraving has the characteristics of high speed, simple operation, and high precision. It is precisely because of the many characteristics of laser engraving technology that its application field is no longer the traditional numerical control and electronic fields. After the development of modern microscopic technology, people combined laser engraving technology with nanotechnology to derive a new nanoparticle laser engraving technology. However, people generally have a misunderstanding about nanoparticle engraving; that is, they think that the strength and hardness of the particles cannot achieve engraving and that this technology is an unfeasible technology [20].In the middle of the 20th century, Swiss scientists successfully used nanoparticle laser engraving technology to achieve engraving on copper plates, and this technology was really recognized by people. The general laser engraving technology is mainly composed of three parts, and the nanoparticle technology engraving technology is composed of two parts, namely high-energy particles and particle transmission units.After the emergence of laser engraving technology, people generally believe that light is a very magical and energetic thing. After the birth of nanoparticle laser engraving technology, nanoparticles are also full of mystery and energy like light.With the development of nanotechnology, as well as the unique effect of nanoparticle itself, its appearance has caused a huge impact on the traditional carving industry and art industry. Among them, the most serious impact is the miniaturization of art works. In terms of figure sculpture, many miniature and miniaturized works of art have appeared under the influence of nanotechnology, such as the nuclear boat recorded in the Qing Dynasty, the thinker carved by British masters, and the Statue of Liberty copied by Italian scholars. The earliest applications of laser engraving on nanoparticles began in the late 20th century [21]. In this period, people simply arranged and combined the particles and did not discover the unique properties of the particles, so there were few laser engraving works of art in that period, and there were not many representative mature works of art. In modern times, scientists have mastered this skill proficiently, and many carving techniques have been derived from it. Figure 3 is its basic operation flow.Figure 3
Nanoparticle laser engraving process.However, since the development of nanoparticle laser engraving, many engraving methods have emerged, such as nanoparticle printing. Different methods often have different advantages and disadvantages, and, after using different methods for engraving, the artistic works produced by people are also different [4]. Table 1 is a comparison of different nanoparticle laser engraving methods.Table 1
Comparison of nanoparticle laser engraving methods.
CategoryPreparation principleAdvantageDisadvantageDNA foldingSculpting DNA into a shape with particlesSmall size, mature technologyNeed patiencePrinting technologyAllow nanoparticles to build up on surfaces and guide them into a certain shapeTechnology is similar to printing technologyHigh requirements for equipmentMicro contact printing technologyEmbedding particles into objects with lamination materialEmbedded operationLamination material is relatively rareFreeze dryingFreeze particles into solids that maintain a certain shapeSimple to implementStrict temperature controlAtmospheric dryingThe particles are contracted by the tension on the surface of the objectOnly need special solvents to achieveSide effects of solvents


## 3.3. Micro and Nano Sculpture Art

Sculpture, also known as carving, can be traced back to ancient times. Before the microscopic world appeared in people’s field of vision, sculpture only referred to artistic creation in the macroscopic world. By fully expressing their emotions on a variety of moldable materials, people turn originally messy materials into artworks one after another [5]. The artistic characteristics of sculpture are mainly as follows.


### 3.3.1. 3D Solids

Traditional sculpture generally sculpts solid objects in three-dimensional space, and the final product is often a three-dimensional entity [6]. Under the influence of the physical object, the first thing people pay attention to is its shape. The shape, size, and posture of the entity are all people’s intuitive feelings about the physical object.


### 3.3.2. Feelings Vary from Person to Person

Sculpture is an important medium for artists to express their feelings. However, because each person wants to express different emotions, their life experiences are also different, so people’s emotions towards sculpture will also be different [11]. In the beauty conveyed by sculpture, people understand the image of sculpture through their own perception of beauty.


### 3.3.3. Rich Expressiveness

Although there is only one entity, sculpture has rich expressive power [22]. On the one hand, sculpture emphasizes a subjective spirit, so everyone can get a certain emotional expression from it. In the process, the sculpture is also expressing its own emotions. Sculpture, on the other hand, is an aesthetic. Aesthetic object differences will also be reflected in the sculpture itself and have an impact on the expressiveness of the sculpture.


### 3.3.4. Sufficient Sense of Volume

Sculptures are generally made of bronze or marble. Therefore, they generally do not rely on color to win but problems are solved in terms of volume, and primary and secondary contradictions are resolved in terms of volume. Sculpture is often prioritized by how its salient points are organized.After possessing the above-mentioned numerous carving techniques, people are no longer satisfied with the carving of traditional products, and finally people turn their attention to the art of micro-nano sculpture. But, for ordinary people, the micro-nano world is too microscopic to appreciate. Later, with the advent of microscopes, the world in micro-nano was first revealed to people’s eyes. Figure4 is a nanoimage under a microscope. The figure is a petal-like crystal composed of nanoparticles and an animal-like shape composed of countless particles. In modern times, with the help of advanced technology and high-power microscopes, most scientific artists have been able to write their own chapters in the micro-nano world. After this, micro-nano technology and art have been continuously integrated, and science and art have finally achieved the same frame in reality.Figure 4
Micro-nano sculpture.


## 3.3.1. 3D Solids

Traditional sculpture generally sculpts solid objects in three-dimensional space, and the final product is often a three-dimensional entity [6]. Under the influence of the physical object, the first thing people pay attention to is its shape. The shape, size, and posture of the entity are all people’s intuitive feelings about the physical object.


## 3.3.2. Feelings Vary from Person to Person

Sculpture is an important medium for artists to express their feelings. However, because each person wants to express different emotions, their life experiences are also different, so people’s emotions towards sculpture will also be different [11]. In the beauty conveyed by sculpture, people understand the image of sculpture through their own perception of beauty.


## 3.3.3. Rich Expressiveness

Although there is only one entity, sculpture has rich expressive power [22]. On the one hand, sculpture emphasizes a subjective spirit, so everyone can get a certain emotional expression from it. In the process, the sculpture is also expressing its own emotions. Sculpture, on the other hand, is an aesthetic. Aesthetic object differences will also be reflected in the sculpture itself and have an impact on the expressiveness of the sculpture.


## 3.3.4. Sufficient Sense of Volume

Sculptures are generally made of bronze or marble. Therefore, they generally do not rely on color to win but problems are solved in terms of volume, and primary and secondary contradictions are resolved in terms of volume. Sculpture is often prioritized by how its salient points are organized.After possessing the above-mentioned numerous carving techniques, people are no longer satisfied with the carving of traditional products, and finally people turn their attention to the art of micro-nano sculpture. But, for ordinary people, the micro-nano world is too microscopic to appreciate. Later, with the advent of microscopes, the world in micro-nano was first revealed to people’s eyes. Figure4 is a nanoimage under a microscope. The figure is a petal-like crystal composed of nanoparticles and an animal-like shape composed of countless particles. In modern times, with the help of advanced technology and high-power microscopes, most scientific artists have been able to write their own chapters in the micro-nano world. After this, micro-nano technology and art have been continuously integrated, and science and art have finally achieved the same frame in reality.Figure 4
Micro-nano sculpture.


## 4. Preparation of High-Refractive-Index Flexible Nanoparticle Laser Engraving Materials

All particles have sizes, so how to measure or even calculate them becomes the first problem we need to solve. To solve such problem, we introduce the optical concept of light force. In the field of geometrical optics, for general particles, the optical force can be simply expressed by(1)F=0.3NbPc,where P is the angle of incidence in the field of light, Nb is the refractive index of the medium based on this angle of incidence, and c is the speed of light. But this is the particle representation in the general case. If the position area of the particle changes, then we cannot get the light force in this case using the above method. Therefore, we introduce an approximate expression method, whose expression is shown in formula (2):(2)Fg=0.4I∆Q2,(3)Fm=λQNbc.In the above formulas, we divide the optical force into two partsFg and Fm, which represent the actual gravitational gradient and the approximate mass gradient, respectively. I refers to the rate of change of the particle, Q is the polarizability of the particle during the change, and λ represents the rate of change of the optical force of the incident angle of the particle. Through the above method, we can basically calculate the positions of different particles.(4)M=θdπn1−n22.But only the calculation of particles cannot meet our actual needs. Therefore, on the basis of calculating the particle position, we introduce the refractive index and transmission rate of the particle.M represents the transmission rate during particle motion, and the result is mainly affected by particle diameter d and particle position n.Under certain conditions, the tension between the optical force acting on the particle and its area can be expressed by the following formula:(5)<F>=<∫sd⋅θdS>,θ=14εFF+d−εF2,<F>=14∫0πεFF+dssinθdθdρ.In the above formula,F is the optical force, θ is the tension per unit area of the particle, and ε is a unit vector.In three-dimensional space, the change of the particle’s position also involves the influence of another parameter, namely, the electromagnetic field. If we assume that the particle moves infinitely in the study area, then its motion characteristics can be expressed as(6)∂A=ΔF,Aϖ=λ0ϖFϖ.In the above formula, we have obtained its basic motion law. Next, we use some special algorithms to estimate and predict the motion of the particles.Before estimation, we introduce an actual error value ofρ, and the final error calculation is shown as follows:(7)φ=λFρA⋅λ.Since the three-dimensional region is not easy to characterize, we adopt a segmentation method. By formula (8), we can get the slope change between particle motions, where k represents the slope value of a distance in particle motion.(8)l=arctank2−k11+k1k2.Then we compare the slope transformation of the particle with the maximum value of the magnetic field. If it is satisfied, it means that it basically fits the curve we estimated. If it is not satisfied, we need to refit its motion curve.(9)k1k2<∂max,Q=∑i=0nNiθiFn∑i=0nNiλi.In the above formula,Q represents the fitting result, and N is the particle refractive index.NURBS curve fitting calculation is as follows:(10)p=∑i=0nNi∑Qj∑i=0nNiλi,pk≈pε∼θi,d=∑i=1npk−pk−1,m=pk+pk−pk1d.In the above formula, we construct a rational basis function using the least squares method.p is the control vertex of the curve, which is a kind of basis function. In order to make the parameters more uniform, the parameters are equidistant:(11)d=∑i=1npk−pk−11/3,m=pk+pk−pk11/3d,where m is the calculated result of the node in the chord length and d is the chord length. It utilizes the centripetal parameter method to achieve continuous minimization of the cumulative parameter:(12)β=m+1n−p+2,S=intβ,M=1+βsm+1+βsm,S=β−S.In the above formula, to finally determine this basis function, we introduce the vectorsS and β. In the case of other known parameters, we continue to round and fit to get the final error value of M. The larger the result, the lower the fitting rate of the final curve, and the smaller the result, the higher the fitting rate.In order to explore the actual refractive index and transmittance of different particles and finally confirm the role of ZnO nanoparticles in laser engraving, the following experiments are now performed.First, we take different numbers of nanoparticles for different elements and then test the general conditions of their refractive indices. The reason why different quantities are selected for different particles is that the size of some nanoparticles is too small, and the method used in this experiment cannot accurately measure the particles that are too fine. Before the experiment, we selected four particle elements and then measured their weight and corresponding refractive index. The specific results are shown in Table2.Table 2
Test results of different particle elements.
ElementWeight (mg)Refractive indexC0.442.11Cu10.1220.23Zn20.0310.09ZnO15.1115.49Table2 shows that, in the actual measurement process, we selected the largest amount of zinc, which is 20.03 mg, and the least selected amount of carbon, which is only 0.44 mg. By measuring the refractive index of its entire number of particles, we found that copper has the highest refractive index at 20.23, followed by ZnO at 15.49.However, considering the difference in the number of selected particles, we need to calculate the unit refractive index of particle elements and estimate the actual refractive index of different particle elements, so as to determine the basic refractive index of particle elements. Table3 is the unit refractive index of different particle elements.Table 3
Unit refractive index of different particle elements.
ElementWeight to volume ratio (mg/v)Unit index of refractionC23.195.02Cu1.6711.32Zn3.789.09ZnO5.3312.01Table3 shows that, after measuring the unit refractive index of the particles, copper, which we estimated to have a larger refractive index, still maintains a relatively high refractive index of 11.32. The ZnO particles, which were originally next, became the particle elements with the highest refractive index, as high as 12.01. This fully explains the refractive index of the particle in general.After determining the refractive index of ZnO particles in general, we decided to evaluate their performance in different media. Moreover, in order to fully explore the utility of this particle in laser engraving, we also need to conduct a comprehensive evaluation of its refractive index under different structures and morphologies. Table4 shows the relevant parameters of different media. Table 5 shows the effect of different structures on the refractive index of ZnO nanoparticles.Table 4
Critical parameters of common media.
MediumBoiling pointTemperatureDensityCarbon dioxide−78.531.10.433Nitrogen−33.4135.10.235Isopropyl alcohol82.2235.20.277Ethanol78.3243.00.267Benzene80.1288.80.330N-propanol97.2235.60.276Table 5
Effects of different structures on the refractive index of ZnO nanoparticles.
ZnOCorrelation formula parametersTimeCoefficientA0.0012138T − 0.000980.001210.99901B0.0013417T − 0.006110.004780.91156C0.0011209T − 0.001180.004560.92120D0.0010120T − 0.000340.009120.92012E0.0010011T − 0.002710.003780.90129Tables4 and 5 show that different media and different structures do have some effect on the refractive index of the particles. But we also see that, in the process of this influence, the correlation coefficient of the particle’s refractive index has been kept above 0.9, which shows the stability and certain flexibility of the particle. At the same time, at different times, although the particle’s final refractive index correlation coefficient fluctuated, its fluctuation trend also slowed down as time went on.After confirming that time and related structures do not have much influence on the refractive index of particles, we decided to start from the particle concentration to explore the refractive index fluctuations of particles at different concentrations. At the same time, it aims to complete the preparation of ZnO nanoparticle laser engraving materials. Figure5 shows the variation of the particle refractive index with time.Figure 5
Variation of particle refractive index with time.
(a)(b)Figure5(a) shows that the refractive index of the particles changes with time at different particle concentrations. Among them, when the particle concentration reaches 3%, its refractive index is continuously stable with the passage of time and finally reaches an average of 1.7, which is much higher than the particle refractive index at other concentrations. Figure 5(b) shows that the refractive index of the particles is constantly fluctuating over time. Especially from the 10th minute to the 14th minute, the refractive index of the particles is always relatively low. But, around the 18th minute, the refractive index of the particles can reach 1.7, which basically meets the requirements.The refractive index of the particles will change with time, but the average value can reach 1.7 in the end. Now it is necessary to study the coefficient relationship of ZnO nanoparticles under different conditions. This coefficient is a comprehensive reflection of refractive index and flexibility, which can explain the comprehensive situation of particles to a certain extent. Table6 shows the correlation coefficient of ZnO nanoparticles under different conditions.Table 6
Correlation coefficients of ZnO nanoparticles under different conditions.
Crystal faceSurface areaRefractive indexRelative velocity{001}33.3563.8510.356{010}29.7892.1560.296{011}38.1593.3660.326{100}38.1232.2960.398{101}29.1811.1160.258Table6 shows that ZnO nanoparticles possess different surface areas under different crystal structures. The size of its surface area also affects the refractive index and flexibility of the particles to a certain extent. We found that when the particle surface area reaches more than 30, the correlation coefficient can reach more than 0.3, and the highest can reach 0.398.After fully studying the refractive index of this particle, we are well prepared to study its flexibility. Before studying the flexibility of this particle, we added three more particles for comparison to fully study the flexibility of ZnO nanoparticles.Figure6(a) shows that the flexibility of ZnO nanoparticles remains in the first place over time, reaching a maximum close to 1.4. Figure 6(b) shows that the flexibility of ZnO nanoparticles changes to some extent after adding different active substances. In particular, at the 25th minute, the flexibility of the particles reached 1.4.Figure 6
Activity and flexibility tests of different particles.
(a)(b)In the process of fusion and degradation, we selected different particle types, but they all belong to the same kind of ZnO nanoparticles. We explored the preparation of ZnO nanoparticles in laser engraving by comparing their fusion rate and degradation rate. Figure7 shows the fusion rate and degradation rate of the particles at different times.Figure 7
Fusion rate and degradation rate of particles at different times.
(a)(b)Figure7(a) shows that the fusion rate of 3-ZnO and 5-ZnO increases continuously at different times. This fully shows that the particles meet certain requirements in the preparation process of laser engraving materials. Figure 7(b) shows that the degradation rates of 3-ZnO and 5-ZnO decreased continuously over different time periods, and when the time reaches the 6th minute, its degradation rate reaches 0.4.It takes a certain amount of time for the particles to be completely integrated and degraded, so the next experiments will be carried out in different concentrations of particles. Ultimately, what we need to explore is the flexibility and transmittance of the particle, which will determine whether the particle can become the laser engraving material we prepared. We selected 6 kinds of particles with different concentrations and measured their flexibility and transmittance in turn. Figure8 shows the flexibility and transmittance of particles at different concentrations.Figure 8
Particle flexibility and transmittance.
(a)(b)Figure8(a) shows that the flexibility of the particles increases with increasing concentration, and when the concentration reaches 1.5%, the flexibility reaches 1.5. Figure 8(b) shows that the transmittance of particles fluctuated continuously under the condition of increasing concentration. There was a low value when the concentration was 1%, and the transmittance was the highest when the concentration was about 0.1%, reaching 1.04.After the above experiments, we can basically draw the following conclusions: Through the research on the transmittance and flexibility of the particles during the experiment, we found that the nanoparticle materials with low concentration are more suitable for nanoparticle laser engraving. Such samples can engrave better three-dimensional microstructures. The high-concentration particles have high refractive index and flexibility, but, due to their low transmittance, we think they are no longer suitable for laser engraving.


## 5. Discussion

The incorporation of ZnO nanoparticles into nanoparticle laser engraving is an innovation and development of traditional engraving technology. ZnO nanoparticles have excellent refractive index and flexibility. Introducing them into laser engraving technology will provide technical support for the development of micro-nano sculpture art and will have a huge impact on the shape and emotional shaping of micro-nano sculpture. At the same time, the preparation of high-refractive-index flexible nanoparticle laser engraving materials is an innovation to the previous engraving materials. On this basis, people can use materials richer in refractive index and flexibility and use them in the engraving of micro-nano sculptures. In this process of continuous evolution, sculpture art will continue to develop and constantly reflect the whole picture of social life, bringing people’s longing and expectations for life.


## 6. Conclusion

On the basis of traditional laser engraving technology, this paper incorporates ZnO nanoparticles and completes the preparation of high-refractive-index and flexible nanoparticle laser materials. The article first focuses on traditional laser engraving techniques and methods and then completes the integration of ZnO nanoparticles on this basis. At the same time, the article also played a certain role in promoting the progress and development of micro-nano sculpture art. However, the ZnO nanoparticle laser engraving technology mentioned in the article is in the experimental stage, so its technology is not too mature, and it may not be able to handle complex micro-nano sculptures. In the future, the article will continue to promote the development of ZnO nanoparticle laser engraving technology, change it from theory to reality, and continuously promote the development of micro-nano sculpture art.



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*Source: 9986466-2022-07-13.xml*