Vol. 3 No. 1 (2021)

Open Access

Original Research Articles

Article ID: 844

Magnetic Field-Dependent Reversal Effect of the Electromagnet- Induced Normal Stress of Magnetorheological Materials

by Taixiang Liu, Yangguang Xu, Ke Yang, Lianghong Yan, Beicong Huang, Zhuo Zhang, Xiaodong Jiang, Hongwei Yan

Materials Physics and Chemistry, Vol.3, No.1, 2021; 314 Views, 7 PDF Downloads

Magnetorheological (MR) materials are a type of magnetoactive smart materials, whose physical or mechanical properties can be altered by applying a magnetic field. In usual, MR materials can be prepared by mixing magnetic particles into non-magnetic matrices. In this work, the electromagnet-induced (or non-uniform magnetic field-induced) normal stress of MR materials is studied. It shows that the stress does not vary monotonically along with the enhancement of the applied magnetic field. There exists a field-dependent reversal effect of the variation of the stress. The reversal effect is thought resulting from that the ratio of interparticle repellent of parallel magnetic particles to the particle-electromagnet attraction gets enlarged along with the enhancement of the field.

Open Access

Original Research Articles

Article ID: 791

Research on Health Effects of Environmental Chemicals Based on Structure and Gene Association Analysis

by Yinbing Zhang

Materials Physics and Chemistry, Vol.3, No.1, 2021; 309 Views, 12 PDF Downloads

China is a major producer and consumer of chemicals. The production and use of chemicals play a role in the development of the entire national economy. Therefore, effective chemical management has a huge impact on the development of the national economy. At present, chemical management guidelines have achieved a lot in chemical operations, but there are still many shortcomings. Relevant institutions should further improve the standard system, strengthen the coordination of subjective institutions, the supervision and management, establish information standards, complete information sharing, build a feedback system, strengthen the transformation of experimental results and trust training.

Open Access

Original Research Articles

Article ID: 845

Synthesis and Photocatalytic Activity of Polyhedral BiVO4

by Jianfei Chen, Ranbo Yu, Zumin Wang

Materials Physics and Chemistry, Vol.3, No.1, 2021; 278 Views, 16 PDF Downloads

Polyhedral BiVO 4  was prepared by hydrothermal-calcination two-step method. The physicochemical properties of polyhedral BiVO 4  were characterized by XRD, TG/DTA, SEM and UV-vis DRS. The photocatalytic properties of the samples were investigated by using 10 mg/L methylene blue (MB) as the target degradant. The experimental results showed that the  prepared polyhedral BiVO 4  is monoclinic. The morphology is about 10 μm polyhedral block. The pure phase BiVO 4  has strong visible light absorption capacity. Under visible light irradiation, the prepared BiVO 4  can degrade 90% of MB within 40 min. Moreover, the photocatalytic performance was further improved by forming a BiVO4/BiOCl heterojunction, and the kinetic reaction rate was 1.5 times that of the pure phase BiVO 4

Open Access

Original Research Articles

Article ID: 846

The Progress of Composites with High Thermal Conductivity and Electromagnetic Shielding

by Houbao Liu, Renli Fu, Weisong Dong, Yingjie Song, Hao Zhang

Materials Physics and Chemistry, Vol.3, No.1, 2021; 278 Views, 8 PDF Downloads

As electronic components develop toward high power, high package density, and device size miniaturization,  heat dissipation and electromagnetic interference between electronic components are becoming more and more serious. In order to solve the adverse elec  tromagnetic waves and heat radiation generated by electronic devices, people have high hopes for electronic packaging materials with high thermal conductivity and electromagnetic interference resistance. This paper summa  rizes the research status of high thermal conductivity composite materials and electromagnetic shielding composite materials. Finally, the latest research results of high thermal conductivity and electromagnetic shielding composites are introduced, and the future development trend of new materials for microelectronic packaging is prospected.

Open Access

Original Research Articles

Article ID: 841

Finite Element Analysis and Experimental Study of Atomized Gas Flow Field in Spray Forming

by Yongqi Cheng, Yang Bai, Yuhang Chen, Peng Zhang

Materials Physics and Chemistry, Vol.3, No.1, 2021; 255 Views, 11 PDF Downloads

During the spray forming process of die steel, the gas flow field of nozzle atomizer has an important influence on the atomization effect of metal solution and the shape and performance of deposited billet. In this paper, the finite element analysis method was used to study the flow field distribution of the annular slot type restricted nozzle. The results showed that the negative pressure area was formed at the front of the atomizing gas outlet of the nozzle; the negative pressure area was enlarged and the negative pressure value was increased with the increase of the extending position of the liquid guide pipe and the atomizing pressure; when the atomizing pressure was 0.5MPa and the extending position of the liquid guide pipe was 7mm, the negative pressure value of the front of the liquid guide pipe could reach-38650Pa and the gas flow rate could reach 191.4m/s; the back-injection could be effectively avoided by optimizing the appropriate process parameters. And the damage of atomizing nozzle could be reduced.  

Open Access

Original Research Articles

Article ID: 566

Mathematical Modeling of Hydraulic Resistance in Pipes With Rough Walls

by Lobanov Lgor Evgenjevich

Materials Physics and Chemistry, Vol.3, No.1, 2021; 757 Views, 9 PDF Downloads

In recent years, the numbers of patents have been devoted to the development of rough pipes. The technique theoretical settlement determine of factor of hydraulic resistance for round pipes with rough walls is developed on the basis of a principle of a superposition of complete viscosity in turbulent a layer mainly distinguished from the existing theories. The received results of account for the extended range of determining parameters much distinguished from appropriate given for round pipes with turbulizers, specify a level и intensification of heat exchange.

Open Access

Original Research Articles

Article ID: 1625

Modification in LiFePO4 electrode material for lithium-ion battery

by Yan Yin

Materials Physics and Chemistry, Vol.3, No.1, 2021; 146 Views, 7 PDF Downloads

Despite the excellent stability of LiFePO 4 , shortcomings such as poor conductivity and low energy density reduced its comprehensive properties and application range. In this article, I summarized three main practical methods so far. It will briefly introduce the fundamental property of LiFePO 4 , carbon coating, and nanocrystallization, and then describe doping in detail. Comparing the best dopants from research pieces, we can see that the capacity and conductivity will first increase and then decrease, and the proper ions may lie in lanthanide.