bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on Synthesis of 9,9-Bis (4-hydroxyphenyl) Fluorene by Heteropoly Acid Catalysis
Authors: Liu Bin , E Yongsheng 
Published: July 2023

Abstract
9,9-Bis (4-hydroxyphenyl) fluorene is synthesized with heteropoly acid instead of inorganic acid as the catalyst, which has great significance for environmental protection. In this experiment, the synthesis of 9,9-bis (4-hydroxyphenyl) fluorene is studied by using fluorenone and phenol as raw materials, using homemade heteropoly acid 11-tungsten-titanium titanium (molecular formula H4Ti(H2O)TiW11O39) as the catalyst and 3-mercaptopropionic acid as the cocatalyst. The structure of the catalyst was characterized. The effect of the molar ratio of raw material, reaction temperature, reaction time, and the dosage of catalyst and cocatalyst on the purity and yield of 9,9-bis(4-hydroxyphenyl) fluorene are investigated, and the best reaction conditions are obtained. The results show that the new catalyst has a good catalytic effect, and the product has good quality and a high yield.
Study on the Synthesis and Rheological Properties of Polycarboxylate Superplasticizer with Different Main Link Density
Authors: Wang Zhaopeng 
Published: July 2023

Abstract
Rheological properties of concrete are considered to be the most ideal method to characterize the working performance of concrete. Rheological models are used to quantitatively characterize the working performance of concrete based on the yield stress and viscosity of fresh cement paste. In this paper, Rheology QC was used to study the influence of different main link densities (acid-ether ratios) on the rheological properties of fresh paste. The Bingham model was used to fit the rheological curve of the slurry, and the influence of different main link densities on the yield stress, plastic viscosity, and thixotropic ring area of the slurry was analyzed. And the structural characterization and concrete performance characterization were carried out. The results show that the plastic viscosity and yield stress decrease with the increase of the main link density, and the thixotropic area also increases first and then decreases. When the acid-ether ratio is 3.5, the dispersion, rheology, and thixotropy properties of the sample are better.
Study on Preparation of Homogenized Highly Dispersible AlON Powder
Authors: Xue Zhongyuan , Liu Yuyang , Wang Xingming 
Published: July 2023

Abstract
The quality of Aluminum oxynitride (AlON) powder is the main factor affecting the properties of ceramics. To accurately control the nitrogen AlON content and improve the dispersion degree of powder, AlON powder was prepared from γ-Al2O3 and activated carbon powder by carbothermic reduction and nitridation. The uniformity of distribution of raw materials and the dimension and microstructure of AlON powder was controlled by changing the time and rotation rate of the ball milling process. The influences of ball milling process parameters on the microstructure and distribution uniformity of Al2O3/C mixed powder, microstructure, and particle size of AlON powder were studied. The results show that powder agglomeration was effectively reduced, and the uniformity of raw material distribution was increased by controlling the time and rotation rate of the ball milling process. The Al2O3/C mixed powder has good particle size and uniform distribution with roller ball milling for 24 h. After holding the powder at 1700 °C for 60 min, the homogenized AlON powder was obtained, and the residual carbon content was about 0.04 wt%. When the time of planetary ball milling at 250 rpm was 16 h, highly dispersible AlON powder was obtained.
Achieving Long Cycle Life and Single-Crystal of Li-rich Mn-based Cathodes by Reheating with Sintering Additives
Authors: He Haocheng , Li Hao , Mou Lisha , Ou Mei , Wang Hua , Ren Zhimin , Zhang Xiangjun 
Published: July 2023

Abstract
Lithium-rich layered oxides, as one of the most potential cathode materials for lithium-ion batteries, still need crucial improvements in mechanical strength and cycle life. Herein, we present an effective strategy to improve the compacted density and cycle stability of Li-rich materials by adding the sintering additive (H3BO3, Li2WO4) for reheating. After reheating with a complex additive of Li2WO4 and H3BO3, the compacted density increased from 3.07 to 3.29, and micromorphology changed from spherical secondary agglomerate to dispersive single crystals with micrometer size. It was found that after reheating with Li2WO4, the sample exhibited a discharge capacity of 241.9 mAh g-1 with an improved ICE of 80.9 %, and cycle life extended to 658 cycles, increased by nearly 250 cycles. This work guides the industrialization of Li-rich cathodes.
Study on Preparation of Slow-release Polycarboxylate Superplasticizer by Macromonomer EPEG at Room Temperature
Authors: Chen Hao 
Published: July 2023

Abstract
Slow-release polycarboxylate superplasticizer was synthetic under room-temperature conditions, a free radical copolymerization reaction occurred under the action of a redox initiator, and the optimal preparation process and temperature effect were discussed in detail. The results show that the best preparation process (EP-15) is: acid-to-ether ratio is 1.89, the amount of NaH2PO2 is 2.27%, the appropriate reaction temperature is 15-25°C, and the suitable macromonomer is EPEG-3000 of OXIRANCHEM. Tests have verified that compared to a commercially available slow-release polycarboxylate superplasticizer (PCE-1), EP-15’s dispersion retention performance and the strength growth of concrete in 3 d, 7 d, and 28 d are significantly better.
Preparation and Characterization of fluorinated copolymer emulsion for concrete protection
Authors: Qiu Xi-Rong , Xu An-Hou 
Published: July 2023

Abstract
Emulsifier-free copolymerizations of 2,2,2-trifluoroethyl 2-methylpropanoate (TFMPA) and methyl acrylate in the presence of surface-active commoner, undecylenic acid (UA), were carried out using potassium persulfate (KPS) as initiator. The prepared copolymer emulsions were characterized and analyzed by FT-IR, 1H and 19F NMR spectra, TEM, dynamic light scattering (DLS), and contact angle testing. The results showed that the average particle size of copolymer latex particles was 200-300 nm with a relatively uniform particle size distribution. The glass transition temperature was controlled with the monomer feed ratios. After copolymer emulsions coating on the concrete surface, the contact angle was significantly increased, and the water absorption of the concrete was significantly reduced.
Study on sustained-release polycarboxylate superplasticizer prepared by EPEG macromonomer
Authors: Chen Zhanhua 
Published: July 2023

Abstract
Ethylene glycol monomer polyoxyethylene ether (EPEG) is a new macromonomer that has been introduced in recent years. Its special molecular structure enables it to form copolymers with acrylic acid (AA) that are closer to the ideal copolymerization structure. However, the current production capacity is relatively small, so there are not many related studies. Therefore, this paper uses EPEG as the main raw material to prepare a slow-release polycarboxylate superplasticizer SP-YH. By studying the effects of different reaction conditions on the properties of SP-YH, the optimum synthesis conditions were determined. The structure of the polymer was characterized by gel permeation chromatography (GPC) and infrared spectroscopy (FTIR). In addition, the concrete test and hydration heat test results show that it has better slump protection performance and compression resistance than the commercial slump protection polycarboxylic acid water reducer.
The study on performances of environment-friendly colorless chemical conversion coatings on aluminum alloy
Authors: Hou Bin , Zhu Lizhi 
Published: July 2023

Abstract
With the increasingly high requirements on the appearance of electronic equipment and environmental protection, conventional chromate chemical conversion coatings on aluminum alloys gradually showed some shortcomings, such as the color difference in appearance and harm to human health and the environment in the process. In this paper, three kinds of environment-friendly colorless chemical conversion coatings (LANTH-613, ALTRCHR-250, YMT-631) were prepared by using 5056 and 6061 aluminum alloy samples and visually observing the appearance of the coatings. Then, the performances of the coatings, such as the morphology, corrosion resistance, electrical contact resistance, and paint adhesion, were characterized by scanning electron microscope, salt spray test, electrical contact resistance test, and cross-cut test, respectively. As a result, we proposed YMT-631 colorless chemical conversion coating could be used alone as a long-term protective coating for aluminum alloy parts that require the natural appearance of aluminum in electronic equipment, by which corrosion resistance and adaptability in the harsh environment could be significantly improved.
Study of Fe-Doped Ordered Mesoporous Titanium Dioxide Synthesis
Authors: Yan Zhiyuan , Ren Han , Geng Yuan , Yuan Yuehui , Meng Sicong , Cheng Rongchao , Qu Yuanzhi , Wang Ren , Yang Hong , Gao Shifeng , Zhang Yan , Zhang Zhilei 
Published: July 2023

Abstract
Titanium dioxide is often designed as an excellent catalyst carrier and photocatalyst due to its tunable structure. In this paper, iron-doped ordered mesoporous titanium dioxide was prepared. These powders were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and nitrogen physisorption (BET). It was found that mesoporous titanium dioxide powders containing 1% Fe doping were roasted at 350 °C to favor the formation of ordered mesoporous titanium dioxide. This is due to the fact that Fe doping can enhance the pore structure and improve the orderliness of pores, while the increase in temperature can accelerate the growth of grains.
Determination of Several Free Radicals in Electrochemical Disinfection
Authors: Tie Zihan , Qi Lihong , Zhang Jidong , Yang Jinxing , Wang Xuefeng , Zhang Jianhong 
Published: July 2023

Abstract
Electrochemical disinfection is a broad spectrum, efficient, clean, and environment-friendly, and is widely used in water treatment technology. In addition to the active chlorine generated by electrolysis, the oxidation of active oxygen free radicals cannot be ignored. In this paper, the electron spin resonance (ESR) technique is used to measure the ESR spectra of ·OH. 1O2, and O2
- that may exist during the electrolysis process and after the electrification by using two methods of mixed electrolysis of capture agent and electrolyte and adding capture agent after electrolysis. The catalytic activity of four DSA titanium base plates is compared, the existence of several active oxygen free radicals in the electrolysis process is confirmed, and the generated path is inferred. The experiment shows that these reactive oxygen radicals can be produced during the electrification process, and they accumulate continuously with the extension of electrolysis time. After the electrification, the process will continue for a period of time due to the Fenton reaction of metal catalytic ions.
Study on preparation and properties of nanocrystalline TiO2/graphite photocatalytic composite by mechanochemistry
Authors: Pan Xiaoyan 
Published: July 2023

Abstract
Graphite-modified TiO2 composite is a promising photocatalyst in environmental purification. In this study, TiO2/graphite photocatalytic composites were prepared by mechanochemistry using natural flake graphite and nanocrystalline TiO2 as raw materials. The composites were examined by X-ray diffractometer, Raman spectrometer, X-ray photoelectron spectrometer, scanning electron microscope and UV-vis spectrophotometer. The photoelectrochemical properties of the composites were investigated via electrochemical impedance spectroscopy and photocurrent response. The influences of the content and premilling time of graphite on the photocatalytic properties of the composites were studied through the photocatalytic decomposition of methylene blue. The results showed that graphite was exfoliated and broken during ball milling, and defects of graphite increased with the extension of milling time. In the composite, there is no solid solution of carbon atoms in TiO2 lattice. The photocatalytic results indicated that a proper amount of graphite could improve the photocatalytic behavior of TiO2. The TiO2/graphite composite containing 1wt% graphite exhibited the best photocatalytic behavior. The pretreatment of graphite by ball milling could enhance the photocatalytic behavior of the TiO2/graphite composite and the optimal premilling time of graphite was 4 hours.
A Research of Selective Catalytic Reduction of NOx with NH3 by Using Novel Catalysts
Authors: Bai Shuiquan 
Published: July 2023

Abstract
Nitrogen oxides are one of the most important industrial pollutants, which have many harmful effects on the human body and the environment. In this paper, the formation mechanism of nitrogen oxides was studied, and the selective catalytic reduction of nitrogen oxides was carried out by selective catalytic reduction technology. This paper also reviews the low-temperature denitration performance of molecular sieve catalysts, manganese oxide and ceria-based catalysts, and expounds on the influence of catalysts on denitration activity under different active components. It is found that ceria-based catalytic materials have better structural properties and catalytic performance, the methods to improve the performance of ceria-based catalysts are discussed, and the future development of ceria-based catalysts has been prospected.
Finite element analysis on first deep drawing process of combustion calotte made of high temperature alloy GH536
Authors: Wu Shibao , Gao Jing , Li Wenbo , Ma Jia , Wang Heng 
Published: July 2023

Abstract
In order to investigate the characteristics of the deep drawing process of a combustion’s calotte which was made of the high temperature alloy GH536, a finite element model which could simulate the first deep drawing process of this calotte was presented and change features of some key parameters in this deep drawing process were solved by ABAQUS software. Finite element analysis results revealed that ruptures were easy to occur and a press machine with larger tonnage was needed during this deep drawing process.
Study on the influence law and mechanism of industrial atmospheric environment on the corrosion behavior of Q235 carbon steel
Authors: Liu Sen , Wen Xiaohan , Hu Jiayuan , Zhu Liwei , Li Yanwei 
Published: July 2023

Abstract
This paper combines the traditional hanging test and corrosion sensor technology to study and explore the corrosion law and its mechanism of Q235 carbon steel in industrial atmospheric environment. The results show that Hangzhou’s industrial atmospheric corrosion is a constantly changing and highly variable corrosion intensity process with the corrosive strength shows a seasonal trend. Through the analysis of weight loss, macroscopic corrosion morphology, microscopic corrosion morphology and elemental distribution, it showed that the traditional hanging test results and sensor test results had a good correspondence, indicating that the sensor values can be used to study the corrosion of the outdoor samples.
Contributions of Different Functional Groups to Particles in Electrophoretic Display
Authors: Xu Shuteng , Zhang Yue , Zeng Debo 
Published: July 2023

Abstract
Electrophoretic display (EPD) has excellent research potential because of its ultra-low power consumption and friendliness to the eyes. To obtain efficient electrophoretic inks, researchers need to understand the charging mechanism of electrophoretic particles. In this work, several silane coupling agents with similar main chains but different functional groups on the side chains were used to investigate the effects of different functional groups on the charging properties of the electrophoresis particles. The results showed that silane coupling agents containing amino groups resulted in the most positively charged particles, and those containing carboxyl groups resulted in the most negatively charged particles. More importantly, after introducing many additional amino groups by grafting, it was found that the charge on the particle surface was only slightly elevated, indicating that the polymer layer grafted on the particle surface would cover the functional groups inside and hinder the acid-base interactions between the functional groups in the inner layer and the charge control agent. The findings of these results may contribute to the precise design of materials for electrophoretic display.
Influence of Guest Molecular Mass on Gas Hydrate Nucleation via Molecular Simulation
Authors: Li Liwen , Zhong Jie , Zhang Jun 
Published: July 2023

Abstract
Hydrates are ice-like crystals. Its nucleation event has important significance for many industrial fields, such as seawater desalination, gas separation, and gas storage. Therefore, researchers are looking for a kind of highly effective promoters to accelerate hydrate nucleation and stabilize hydrate crystals so that hydrate-based technology can be sustainable and economical. Herein, we use the molecular simulation method and construct ideal guest molecules to study the influence of guest molecular mass on the hydrate nucleation process. Our results show that lighter guest molecules nucleate more easily. However, when the light and heavy guest molecules coexist, the light guest molecules can only enhance the formation of the nucleation precursor but cannot effectively reduce the free energy barrier of hydrate nucleation because of the competition between the light and heavy guest molecules around the critical nuclear state. Overall, our work provides a theoretical basis for the development of hydrate promoters, which is expected to be helpful for their efficient design.
A mathematical study of the influences of dynamic parameters on the memory effect of glasses
Authors: Li Yan Zhuo , Bian Xiao Min , Fu Hao 
Published: July 2023

Abstract
Retaining an imprint of their thermal history is a hallmark of glassy materials. Although its microscopic origin is still in debate, this memory effect is the potential to be utilized in engineering applications as a way to rejuvenate the glasses. For a better understanding of it, we investigated how the memory effect is affected by non-exponentiality and non-linearity, which are two basic features of glass dynamics. A mathematical model with a linear superposition of relaxation functions at a series of experienced temperatures was employed to reproduce the memory effect. The results demonstrate that non-exponentiality has a leading role in determining memory behaviors while non-linearity influences it weakly. An enhanced memory effect found in a recent multistep temperature training experiment is understood with the decreasing non-exponentiality caused by the increasing dynamical heterogeneities of the system. This work provides a guide to regulating the memory effect in practical applications.
Preparation and Properties of Nitrogen-doped Graphene Composite Carbon Materials Prepared from Different Nitrogen Sources
Authors: Zhu Yangyang , Zhu Yu , Ni Hongjun , Gu Ruobo 
Published: July 2023

Abstract
To get materials with better electrochemical properties, the physicochemical properties of nitrogen-doped graphene composite carbon materials prepared from different nitrogen sources are investigated in this paper. Nitrogen-doped graphene composite carbon materials with pyridine, urea, and melamine as nitrogen sources (NGpyridine, NGurea, and NGmelamine) were prepared by electrospinning and post-heat treatment. The results show that graphene exists in all three kinds of composite carbon fibers in the form of multi-layers. The NGmelamine fibers have more defects, the distribution of NGpyridine fibers is more uniform and the diameter of NGpyridine fibers is mostly concentrated in 270-330 nm. The maximum current density of NGpyridine is 27.51 mA/cm2, that of NG urea is 8.99 mA/cm2, and that of NGmelamine is 2.24 mA/cm2. In comparison, NGpyridine shows better electrochemical performance.
Study on Modification Technology of Superfine Dry Powder Fire Extinguishing Agent
Authors: Wang Xuancheng 
Published: July 2023

Abstract
The superfine dry powder fire extinguishing agent has the characteristics of high fire extinguishing efficiency and low cost and has been widely used in the field of fire extinguishing. This paper briefly describes the classification and current problems of dry powder and analyzes the current technology of micronization and surface modification. The superfine dry powder fire extinguishing agent is greatly improved in water resistance by surface grafting modification, the water repellency meets the standard requirements, and the D90 particle size of the dry powder extinguishing agent after modification is ≤15μm.
Effect of oxygen-containing functional groups and pore structure characteristics of coal on the slurryability of coal wastewater slurry
Authors: Li Dedi , Feng Biao , Zong Yue , Lai Xinjie , Luo Yuanlin , Wu Yuechao , Huang Huimin 
Published: July 2023

Abstract
The physical and chemical characteristic of coal have an important influence on the slurryability of coal wastewater slurry. In this paper, eight different coals are used to make coal wastewater slurry, and the effects of oxygen containing functional groups and pore structure characteristics of different coal samples on the slurryability are analyzed. Results show that (a) Coal with more oxygen-containing functional groups on surface have stronger hydrophilicity, higher surface activity and have stronger adsorption capacity for water molecules, this will lead to the reduction of free water and the increase of viscosity of the slurry. (b) Coal with larger BET specific surface area and pore volume and smaller average pore diameter have the stronger ability to adsorb and store water in coal wastewater slurry, thus the concentration of coal wastewater slurry prepared from these coal is low. The conclusion of this paper can provide reference for coal selection in the preparation of coal wastewater slurry.
Research and synthesis of polyolefins materials
Authors: Qi Yuanxia , Li Xiaofang 
Published: July 2023

Abstract
Polyolefins are widely used in our lives, such as food packaging materials, agricultural films, and lubricants, but the lack of polar groups that can make polyolefins compatible with other types of materials has limited the use of polyolefins. This has been a challenging and highly concerned issue in academia and industry. Therefore, it is great significance that we introduce polar groups into polyolefins to improve the use of performance to synthesize functional polyolefins. In this paper, we introduce the direct catalytic polymerization of polar α olefin monomers using rare earth catalysts, and the experimental data shows that we have obtained a higher molecular weight and better selectivity polar α olefin monomer of homopolymer. Subsequently, we determined the optimal reaction conditions for the synthetic polymer through screening of different reaction conditions.
Analysis of damping characteristics in carbon fiber sheet embedded with an Acoustic Black Hole structure
Authors: Zheng Feng , Tang Zhiwen 
Published: July 2023

Abstract
Acoustic Black Hole (ABH) is a newly developed passive control method. It commonly uses the gradual change of the vertical thickness of the structure to control the propagation and aggregation of bending waves, which has excellent performance in structural vibration suppression and other aspects. Carbon fiber is the most famous composite material, the structure of low density, high strength and stiffness. The dynamic characteristics of carbon fiber sheet with ABH structure were analyzed by finite element method, and the vibration suppression performance was further verified by experiments. The results show that in the frequency range of 180~3000 Hz, the vibration level of the CFRP-ABH structure is reduced by 6~20 dB compared with the uniform thickness plate, showing excellent broadband vibration reduction performance.