jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Jianmin Zhou | Yingru Hu | Dexue Chen | Xueli Bai | Yuting Ma | Yongsheng Fu
Source: Research Square (preprint, 2022-10-26)
Field: Materials Science — Biomaterials

Thermal activation and structural succession of coal gangue in southern Sichuan, China Abstract Coal gangue is rich in kaolin clay minerals, which can be used as raw materials for the preparation of adsorbents and intermediates of adsorbents, and is important for the high added value utilization of coal gangue. In this study, coal gangue from southern Sichuan, China, was activated and characterized by calcination at 100~900 °C, and the succession laws of the phase, microstructure and physical properties under thermal activation conditions were studied. Results showed that the content of active hydroxyl groups in the thermally activated coal gangue was the highest, and the chemical reaction activity was highest at 800 °C for 2 h. The pore structure of thermally activated coal gangue is primarily mesoporous, which nearly disappears at 900 ℃. The specific surface area of thermally activated coal gangue is highest at 600 ℃ and lowest at 900 ℃. The results of this study provide a reference for the preparation of adsorbents and adsorbent intermediates from coal gangue. Calcination ; Gangue ; Coal ; Adsorption ; Chemical engineering ; Ecological succession ; Materials science ; Waste management ; Mineralogy ; Metallurgy ; Geology ; Chemistry ; Catalysis ; Organic chemistry Clay minerals and soil interactions ; Hydrocarbon exploration and reservoir analysis ; Coal Properties and Utilization
Authors: Ahmed M. Elewa | Ahmed F. M. EL Mahdy | Ho‐Hsiu Chou
Source: Research Square (preprint, 2022-08-18)
Field: Materials Science — Materials Chemistry

Effective Remediation of Pb2+ Polluted Environment by Adsorption onto Recyclable Hydroxyl Bearing Covalent Organic Framework Abstract Heavy metal ions removal from wastewater has attracted keen interest due to its toxicity. Adsorption is one of the most promising approaches for heavy metal ions removal owing to its simplicity and effectiveness. Recently, covalent organic frameworks (COFs) have become promising adsorbents for effective wastewater remediation. However, many building blocks have been developed, and the constructing COFs with high adsorption efficiency remains a challenge. Herein, covalent organic framework, DHTP–TPB COF, decorated with hydroxyl groups was designed for the efficiency Pb 2+ removal. The DHTP–TPB COF showed excellent performance in adsorbing Pb 2+ from aqueous solution. More importantly, DHTP-TPB COF shows a high selectivity for Pb 2+ compared to other competing ions, which captured Pb 2+ ions with a removal efficiency of over 96% at pH ~ 4. The results show that the DHTP–TPB COF has excellent adsorption capacity at pH 4 up to 154.3 mg/g for Pb 2+ ions, the value is comparable with many COFs reported so far. More interestingly, this work provided a correction to the way of the isotherm study that has been frequently followed before. Moreover, the adsorbed Pb 2+ ions could be readily eluted using a 0.1M EDTA solution, and the DHTP–TPB COF can be reused for more than five adsorption-elution cycles without any significant adsorption efficiency loss. Furthermore, the adsorption mechanism was revealed using the XPS analysis indicating the formation of strong coordination bonding interactions between hydroxyl and Pb 2+ . Therefore, the DHTP–TPB COF produced herein has a high potential for treating Pb 2+ -contaminated wastewater, and it is promising for Pb 2+ ion adsorption in practice. Environmental remediation ; Adsorption ; Covalent bond ; Covalent organic framework ; Bearing (navigation) ; Chemistry ; Environmental chemistry ; Chemical engineering ; Environmental science ; Organic chemistry ; Contamination ; Engineering ; Computer science Covalent Organic Framework Applications ; Metal-Organic Frameworks: Synthesis and Applications ; Environmental remediation with nanomaterials
Authors: Bo Shi | Dandan Zhu | Pengxiang Lei | Ximin Li | Hengbo Xiao | Lihua Qian
Source: JOURNAL OF RENEWABLE MATERIALS (article, 2022-12-01)
Field: Materials Science — Materials Chemistry

Ammonium Metavanadate Fabricated by Selective Precipitation of Impurity Chemicals on Inorganic Flocculants High purity ammonium metavanadate (NH4VO3) is the most vital chemical to produce V2O5, VO2, VN alloy, VFe alloy and VOSO4, which have some prospective applications for high strength steel, smart window, infrared detector and imaging, large scale energy storage system. NH4VO3 is usually produced by spontaneous crystallization from the aqueous solution due to its sharp dependence of solubility on the temperature. However, hazardous chemicals in industrial effluent, include phosphorate, silicate and arsenate, causing severe damage to the environment. In this work, these impurities are selectively precipitated onto inorganic flocculants, while the vanadate dissolved in an aqueous solution keeps almost undisturbed. Therefore, high purity NH4VO3 is produced by the crystallization from the purified solution. By screening various flocculants and precipitating parameters, polyaluminum sulfate with an optimal amount of 50 g/L, is demonstrated to selectively remove phosphorate, silicate and arsenate, corresponding to the removing efficiency of 93.39%, 97.11% and 88.31%, respectively. NH4VO3 from the purified solution holds a purity of 99.21%, in comparison with 98.33% in the product from the crude solution. This purifying technology cannot only produce NH4VO3 with high added value, but also reduce the environmental pollution of waste liquid. Ammonium metavanadate ; Aqueous solution ; Arsenate ; Materials science ; Precipitation ; Ammonium ; Impurity ; Flocculation ; Crystallization ; Effluent ; Nuclear chemistry ; Inorganic chemistry ; Arsenic ; Chemistry ; Vanadium ; Metallurgy ; Organic chemistry ; Waste management Magnesium Oxide Properties and Applications ; Polyoxometalates: Synthesis and Applications ; Advanced Photocatalysis Techniques
Authors: Tamara APARECI GÎRNEȚ | Irina DĂNĂILĂ ȚÎCĂU | Iulian PĂDURARU | Adrian Cîrciumaru | Mihaela-Claudia GOROVEI
Source: The Annals of “Dunarea de Jos” University of Galati Fascicle IX Metallurgy and Materials Science (review, 2022-12-15)
Field: Materials Science — Polymers and Plastics

Trends on Reinforced Polymer Composites – A Review In recent years, the interest in using fiber reinforced composites (FRC) has increased due to their potential to replace traditional materials in various applications. The advantages of polymer composites from natural fibres are: biodegradability, high performance, market availability and low price. This article is based on a review that discusses both polymer composite materials and typical applications by other authors on fiber reinforced composites (FRCs).&#x0D; Composite material ; Materials science ; Natural fiber ; Polymer ; Fiber-reinforced composite ; Composite number ; Advanced composite materials ; Fiber Natural Fiber Reinforced Composites
Authors: Nur Adeela Yasid | Ain Aqilah Basirun | Hartinie Marbawi | Mohd Yunus Shukor | Mohd Khalizan Sabullah
Source: Journal of Environmental Bioremediation and Toxicology (article, 2022-12-31)
Field: Chemistry — Analytical Chemistry

Modelling the Kinetics of Tartrazine Sorption by the Rhizopus arrhizus Biomass Rhizopus arrhizus is utilized in many biotechnological applications such as in the manufacturing of enzymes, including pectinases, amylases, proteases, cellulases, and phytases, and metabolites such as lactic acid, ethanol and fumaric acids. Its spent biomass is useful in the food and feed industry. Its usage as a biosorption agent especially dye sorption is an emerging and important application. In this study we explore 16 adsorption kinetics model of tartrazine by R. arrhizus using nonlinear regression. Based on the statistical indicators especially penalty-based error functions such as adjusted coefficient of determination (R2), Root-Mean-Square Error (RMSE), corrected Akaike Information Criterion (AICc), Bayesian Information Criterion (BIC), Hannan-Quinn Information Criterion (HQC) and Marquardt's percentage standard deviation (MPSD) shows that the pseudo-2nd order (PSO) was the best model followed by pseudo-nth order and Fractal-like Pseudo-2nd Order. The parameter of the PSO model gave a value of equilibrium adsorption capacity, qe of 9.367 mg g-1 (95% confidence interval (C.I.), 9.250 to 9.485) and k2 (g/(mg.min)) of 0.037 (95%, C.I., 0.032 to 0.041). The nonlinear regression exercise allows the uncertainty determination of the parameters to be carried out. Rhizopus arrhizus ; Mathematics ; Nonlinear regression ; Biosorption ; Akaike information criterion ; Sorption ; Mean squared error ; Chemistry ; Statistics ; Adsorption ; Regression analysis ; Lipase ; Organic chemistry Dye analysis and toxicity ; Microbial Metabolism and Applications
Authors: Aïssatou Alioune Gaye | Ramatoulaye Diouf | Alioune Fall
Source: Earthline Journal of Chemical Sciences (article, 2022-11-05)
Field: Materials Science — Materials Chemistry

Bio-sorption of Methylene Blue by Defatted Seed of Adansonia digitata The study was carried to evaluate the ability of defatted seed of Adansonia digitata (DFSE) to remove methylene blue dye from contaminated water. The optimum parameters such as contact time, particle size, absorbent dose, initial dye concentration, and pH were investigated by performing batch experiments models. The kinetics and the isotherms adsorption were evaluated by varying the initial concentration and using the optimum parameters. The optimum of contact time is 90 min and the removal capacity is 99.34 %. A mass of 700 mg is sufficient to reach the maximum removal of methylene blue (99.44 %). The maximum adsorption is obtained with an initial methylene blue concentration of 75 ppm (98.53 %). The optimum particle size is 100 mm. The kinetics of the adsorption process are in accordance with the pseudo-second order model. Experimental values of the adsorption capacity are close proximity to the optimum values predicted by the pseudo-second order model. The Langmuir, Freundlich, Dubinin-Radushkevich and Tempkin isotherms are not suitable to explain the experimental isotherm. Methylene blue ; Adsorption ; Freundlich equation ; Sorption ; Langmuir ; Chemistry ; Chromatography ; Kinetics ; Particle size ; Nuclear chemistry ; Organic chemistry Pickering emulsions and particle stabilization ; Electrostatics and Colloid Interactions
Authors: Jannik Voges | Iryna Smokovych | Fabian Duvigneau | Michael Scheffler | Daniel Juhre
Source: Acta Mechanica (article, 2022-01-28)
Field: Materials Science — Ceramics and Composites

Modeling the oxidation of a polymer-derived ceramic with chemo-mechanical coupling and large deformations Abstract To get a better insight into the coating behavior of a polymer-derived ceramic material, we model and simulate the diffusion, oxidation and reaction-induced volume expansion of a specimen without outer mechanical loads. In this macroscale approach, we use an oxidation state variable which determines the composition of the starting material and the oxide material. The model contains a reaction rate which is based on the change of the free energy due to a change of the concentrations of the starting material, the oxide material and a diffusing gaseous material. Using this, we model a growing oxide layer in a perhydropolysilazane (PHPS)-based polymer-derived ceramic (PDC), containing silicon filler particles. Within the mechanical part of the modeling, we use the Neo-Hookean material law which allows for the consideration of volume expansion and the diffusion kinematics in terms of finite deformations. We derive this continuum formulation in 3D and reduce it later to 1D, as we show that a 1D formulation is sufficient for thin oxide layers in our consideration. In such a case, the reaction-induced volume expansion is mostly limited to strains orthogonal to the oxide layer, as the bulk material hinders transversal deformation. Both formulations, i.e., 1D and 3D, are implemented in the finite element software FEAP. We perform a parameter study and fit the results with experimental data. We investigate the diffusion kinematics in the presence of volume expansion. Additionally, we discuss the influence of the elastic energy on the reaction rate. Materials science ; Ceramic ; Composite material ; Oxide ; Solid mechanics ; Diffusion ; Polymer ; Material properties ; Finite element method ; Coating ; Deformation (meteorology) ; Mechanics ; Thermodynamics ; Metallurgy ; Physics Advanced ceramic materials synthesis ; Injection Molding Process and Properties ; Synthesis and properties of polymers
Authors: Josevânia Rodrigues Jovelino Torres and Eudesio Oliveira Vilar
Source: International Journal of Development Research (review, 2022-09-20)
Field: Materials Science — Metals and Alloys

Hydrogen permeation in metals and alloys: A Brief Review This is an integrative review deals with the hydrogen-metal interaction mechanisms, reversible and irreversible traps and highlights the use of electrochemical permeation as an important tool of evaluation the Hydrogen embrittlement (HE) mechanism. Due to its simplicity, flexibility, low cost and low risk, this technique is widely used in the study of hydrogen transport and diffusion parameters, contributing to the selection of more resistant steels and alloys. On the other hand, it´s important toothose new efforts should be made to develop and implement new techniques that can be applied to different temperature and pressure conditions. Hydrogen embrittlement ; Hydrogen ; Permeation ; Flexibility (engineering) ; Materials science ; Embrittlement ; Diffusion ; Electrochemistry ; Metal ; Metallurgy ; Thermodynamics ; Chemistry ; Membrane ; Corrosion ; Physical chemistry ; Electrode ; Physics Hydrogen embrittlement and corrosion behaviors in metals ; Corrosion Behavior and Inhibition ; Non-Destructive Testing Techniques
Authors: Shubhadip Moulick | Rafiqul Alam | Atindra Nath Pal
Source: arXiv (Cornell University) (preprint, 2022-10-18)
Field: Materials Science — Materials Chemistry

Sensing Remote Bulk Defects Through Resistance Noise in a Large Area Graphene Field Effect Transistor Substrate plays a crucial role in determining transport and low frequency noise behavior of graphene field effect devices. Typically, heavily dope Si/SiO$_2$ substrate is used to fabricate these devices for efficient gating. Trapping-detrapping processes closed to the graphene/substrate interface are the dominant sources of resistance fluctuations in the graphene channel, while Coulomb fluctuations arising due to any remote charge fluctuations inside the bulk of the substrate are effectively screened by the heavily doped substrate. Here, we present electronic transport and low frequency noise characteristics of large area CVD graphene field effect transistor (FET) prepared on a lightly doped Si/SiO$_2$ substrate (N$_A$ $\sim$ 10$^{15}$cm$^{-3}$). Through a systematic characterization of transport, noise and capacitance at various temperature, we reveal that remote Si/SiO$_2$ interface can affect the charge transport in graphene severely and any charge fluctuations inside bulk of the silicon substrate can be sensed by the graphene channel. The resistance (R) vs. back gate voltage (V$_{bg}$) characteristics of the device shows a hump around the depletion region formed at the SiO$_2$/Si interface, confirmed by the capacitance (C) - Voltage (V) measurement. Low frequency noise measurement on these fabricated devices shows a peak in the noise amplitude close to the depletion region. This indicates that due to the absence of any charge layer at Si/SiO$_2$ interface, screening ability decreases and as a consequence, any fluctuations in the deep level coulomb impurities inside the silicon substrate can be observed as a noise in resistance in graphene channel via mobility fluctuations. Noise behavior on ionic liquid gated graphene on the same substrate exhibits no such peak in noise and can be explained by the interfacial trapping - detrapping processes closed to the graphene channel. Graphene ; Materials science ; Substrate (aquarium) ; Optoelectronics ; Noise (video) ; Transistor ; Capacitance ; Field-effect transistor ; Contact resistance ; Silicon ; Doping ; Depletion region ; Quantum capacitance ; Nanotechnology ; Semiconductor ; Voltage ; Layer (electronics) ; Electrical engineering ; Physics ; Electrode Graphene research and applications ; Quantum and electron transport phenomena ; Surface and Thin Film Phenomena
Authors: Junyu Liu | Ziwei Tan | Yongliang Jia | Xiaotong Shi | Ruixia Hou | Jiajia Liu | Dongmei Luo | Xinyu Fu | Tingting Yang | Xiangyu Wang
Source: Journal of Applied Polymer Science (article, 2022-10-01)
Field: Materials Science — Biomaterials

Co‐delivery of tauroursodeoxycholic acid and dexamethasone using electrospun ultrafine fibers to induce early coupled angiogenesis and osteogenic differentiation Abstract In the complicated process of bone regeneration, osteogenic differentiation and angiogenesis are crucial. In this study, a novel dual small molecule composite electrospun scaffold was prepared using polycaprolactone embedded with angiogenic factor tauro‐ursodeoxycholic acid and osteogenic factor dexamethasone to promote early angiogenesis and osteogenesis. Additionally, the related properties, angiogenic activity, and osteogenic activity analyses were conducted for the scaffold. The results demonstrated that the composite scaffold possessed proper mechanical properties and hydrophilicity. During the initial drug release, the release rate of the hydrophilic drug tauro‐ursodeoxycholic acid was higher compared to the hydrophobic drug dexamethasonethe. The drugs were slowly sustained released for more than 528 h. The composite scaffold boosted cell proliferation and accelerated osteogenic differentiation up to 21 days. The alkaline phosphatase activity and mineral deposition were comparatively higher on dual drug‐releasing fibers compared to control scaffolds. Wound healing migration assay and tube formation assay for further in vitro revealed that the composite scaffold exhibited higher efficiency in promoting cell migration and the angiogenesis ductive. Hence, the composite scaffold had a high potential for promoting bone regeneration by enhancing angiogenesis. Tauroursodeoxycholic acid ; Angiogenesis ; Dexamethasone ; Materials science ; Chemistry ; Chemical engineering ; Biochemistry ; Medicine ; Internal medicine ; Unfolded protein response ; Engineering Electrospun Nanofibers in Biomedical Applications ; Bone Tissue Engineering Materials ; Mesenchymal stem cell research
Authors: Huan Lin | Fuhua Shen | Jinbo Xu | Lijun Zhang | Shen Xu | Na Liu | Siyi Luo
Source: Nanomaterials (review, 2022-12-27)
Field: Materials Science — Materials Chemistry

Thermal Transport in Extremely Confined Metallic Nanostructures: TET Characterization In recent years, the continuous development of electronic chips and the increasing integration of devices have led to extensive research on the thermal properties of ultrathin metallic materials. In particular, accurate characterization of their thermal transport properties has become a research hotspot. In this paper, we review the characterization methods of metallic nanomaterials, focusing on the principles of the transient electrothermal (TET) technique and the differential TET technique. By using the differential TET technique, the thermal conductivity, electrical conductivity, and Lorenz number of extremely confined metallic nanostructures can be characterized with high measurement accuracy. At present, we are limited by the availability of existing coating machines that determine the thickness of the metal films, but this is not due to the measurement technology itself. If a material with a smaller diameter and lower thermal conductivity is used as the substrate, much thinner nanostructures can be characterized. Thermal conductivity ; Characterization (materials science) ; Materials science ; Nanomaterials ; Nanostructure ; Nanotechnology ; Thermal ; Metal ; Coating ; Thermal conductivity measurement ; Conductivity ; Composite material ; Metallurgy ; Chemistry ; Physics Thermal properties of materials ; Surface and Thin Film Phenomena ; Advanced Thermoelectric Materials and Devices
Authors: Sami Matthews | Panu Tanninen | Amir Toghyani | Ville Leminen | Juha Varis
Source: Key engineering materials (article, 2022-07-22)
Field: Materials Science — Polymers and Plastics

Numerical Evaluation of Press Forming Parameters and Mould Geometry in Wood Plastic Composite (WPC) Products The purpose of this paper is to investigate factors associated with press-forming of Wood Plastic Composite (WPC) products. The WPC material is a novel, feasible, and economic way to use recycled thermoplastics. Due to the complexity of the fiber-polymer interaction, numerical simulation and thus prediction of WPC behavior in forming have been challenging. Up to now, press moulds have had to be empirically validated. In this paper, we explore the possibility of predicting material behavior using Autodesk Moldflow. Wood-plastic composite ; Composite number ; Composite material ; Materials science ; Engineering drawing ; Polymer science ; Engineering Natural Fiber Reinforced Composites ; Additive Manufacturing and 3D Printing Technologies ; Innovations in Concrete and Construction Materials
Authors: Alla V. Balueva | Ilia N. Dashevskiy | Christian Sims
Source: Journal of Energy and Power Technology (article, 2022-08-30)
Field: Materials Science — Metals and Alloys

Study of Hydrogen Embrittlement in Pipelines and Nuclear Power Plants: Estimates for Durability Due to the increasing need to further develop the world gas and oil industry and the increased public attention to clean energy sources, studying and preventing Hydrogen Induced Cracking is one of the main safety concerns in nuclear power plants, oil pipelines and platforms. In this article, the growth and incubation times for internal Hydrogen Induced Cracks (HIC) are examined. Specifically, these times are modeled in two separate phases - the first phase (I) is a long time approximation, when the crack growth is believed to be slow such that the equilibrium state for gas concentration establishes instantaneously, and the stationary diffusion problem can be solved for each moment of time. The second phase (II) is a short time approximation, when the crack growth is rapid and the concentration of atomic hydrogen is dependent on time. Closed-form solutions are obtained in both cases and are then coupled using a Padé approximation. Hydrogen ; Hydrogen embrittlement ; Pipeline transport ; Diffusion ; Embrittlement ; Cracking ; Moment (physics) ; Durability ; Nuclear power ; Phase (matter) ; Nuclear power plant ; Power (physics) ; Materials science ; Forensic engineering ; Thermodynamics ; Environmental science ; Chemistry ; Metallurgy ; Engineering ; Composite material ; Physics ; Nuclear physics ; Environmental engineering Hydrogen embrittlement and corrosion behaviors in metals ; Material Properties and Failure Mechanisms ; Fatigue and fracture mechanics
Authors: Laurence Cherfils | Alain Miranville
Source: Journal of Mathematical Study (article, 2022-01-21)
Field: Materials Science — Materials Chemistry

On a Coupled Cahn–Hilliard System for Copolymer/Homopolymer Mixtures Our aim in this paper is to study a coupled Cahn-Hilliard system for copolymer/homopolymer mixtures. We prove the existence, uniqueness and regularity of solutions. We then prove the existence of finite dimensional global attractors. Copolymer ; Materials science ; Thermodynamics ; Polymer chemistry ; Polymer science ; Physics ; Polymer ; Composite material Solidification and crystal growth phenomena ; Advanced Mathematical Modeling in Engineering