Three-dimensional core-shell Fe3O4/Polyaniline coaxial heterogeneous nanonets: Preparation and high performance supercapacitor electrodes

Wound dressings with high flexibility, mechanical strength, and porosity have received increasing attention. Herein, nanocomposite sponges of sodium alginate/graphene oxide (GO)/polyvinyl alcohol were prepared by a freeze-thawing cyclic process and freeze-dried molding. The properties of the sponges were investigated including morphology, mechanical properties, swelling, water vapor permeability, in vitro norfloxacin (NFX) release, antibacterial property, and biocompatibility as well as in vivo wound healing in a mouse model. A GO concentration of 1 wt% resulted in the sponges with a homogeneously porous and interconnected network structure, which exhibited suitable water absorption, breathability, and mechanical properties. Hemolysis tests indicated that the prepared sponges were non-hemolytic material. The CCK-8 assay demonstrated that the presence of an appropriate amount of GO could promote the cell proliferation. The sponges displayed excellent bioavailability of NFX, with a sustained release behavior and a strong inhibitory effect against both Escherichia coli and Staphylococcus aureus. The in vivo evaluations demonstrated that the sponges enhanced wound healing. Therefore, these novel nanocomposite sponges are promising candidates for wound healing applications.

Nanocomposite sponges of sodium alginate/graphene oxide/polyvinyl alcohol as potential wound dressing: In vitro and in vivo evaluation

Poly (vinyl butyral)/Graphene oxide/poly (methylhydrosiloxane) nanocomposite coating for improved aluminum alloy anticorrosion

Influence of re-melting on surface roughness and porosity of AlSi10Mg parts fabricated by selective laser melting

Dr. D. Jiang, Y. Wang, Prof. B. Li, Prof. C. Sun, S. Qi College of Science Northeast Forestry University Harbin 150040, P. R. China E-mail: libinzh62@163.com Prof. B. Li Post-Doctoral Mobile Research Station of Forestry Engineering Northeast Forestry University Harbin 150040, P. R. China Dr. Z. Wu Key Laboratory of Engineering Dielectrics and Its Application Ministry of Education Harbin University of Science and Technology Harbin 150040, P. R. China E-mail: zijian.wu@hrbust.edu.cn Prof. H. Yan School of Mechatronics Engineering Harbin Institute of Technology Harbin 150001, P. R. China Dr. L. Xing MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001, P. R. China Prof. Y. Li College of Materials Science and Engineering North University of China Taiyuan 030051, P. R. China

Flexible Sandwich Structural Strain Sensor Based on Silver Nanowires Decorated with Self-Healing Substrate

Microstructural evolution and mechanical properties of IN718 alloy fabricated by selective laser melting following different heat treatments

Wear resistance of graphene nano-platelets (GNPs) reinforced AlSi10Mg matrix composite prepared by SLM

In this research, the effect of several heat treatments on the microstructure and microhardness of TC4 (Ti6Al4V) titanium alloy processed by selective laser melting (SLM) is studied. The results showed that the original acicular martensite α′-phase in the TC4 alloy formed by SLM is converted into a lamellar mixture of α + β for heat treatment temperatures below the critical temperature (T0 at approximately 893 °C). With the increase of heat treatment temperature, the size of the lamellar mixture structure inside of the TC4 part gradually grows. When the heat treatment temperature is above T0, because the cooling rate is relatively steep, the β-phase recrystallization transforms into a compact secondary α-phase, and a basketweave structure can be found because the primary α-phase develop and connect or cross each other with different orientations. The residence time for TC4 SLM parts when the treatment temperature is below the critical temperature has little influence: both the α-phase and the β-phase will tend to coarsen but hinder each other, thereby limiting grain growth. The microhardness gradually decreases with increasing temperature when the TC4 SLM part is treated below the critical temperature. Conversely, the microhardness increases significantly with increasing temperature when the TC4 SLM part is treated above the critical temperature.

https://www.mdpi.com/1996-1944/11/8/1318/pdf

The Heat Treatment Influence on the Microstructure and Hardness of TC4 Titanium Alloy Manufactured via Selective Laser Melting

Development of AZ91D magnesium alloy-graphene nanoplatelets composites using thixomolding process

TiC/316L stainless steel (316Lss) metal matrix composite parts have been formed using selective laser melting (SLM). In this study, we have investigated the influence of the TiC mass fraction on the microstructure evolution, microhardness, friction properties, wear properties, and corrosion resistance of the TiC/316Lss composites. The results show that the microhardness increased by the addition of the TiC mass fraction. In terms of friction and wear properties, the corrosion resistance initially increased, and then decreased. Compared with the pure 316Lss (298.3 HV0.2), the microhardness of the TiC/316Lss composites, which were formed with 2 wt% TiC, was raised to 335.2 HV0.2, which was a 12.4% increase, while the average friction coefficient was 0.123. The reason for this is that the addition of TiC can effectively refine the cell size, and as the TiC content increases, the refinement effect is more obvious. During the melting process, TiC particles act as nucleation centres, hindering the growth of crystal cells, promoting the formation of the austenite phase, and forming fine equiaxed structures, which increases the strength. However, excessive TiC particles aggravate the spheroidisation during the process of SLM, leading to increased defects, as well as a decrease in density and corrosion resistance.

Jing Li

Papers

Microstructural evolution and mechanical properties of IN718 alloy fabricated by selective laser melting following different heat treatments

Wear resistance of graphene nano-platelets (GNPs) reinforced AlSi10Mg matrix composite prepared by SLM

The Heat Treatment Influence on the Microstructure and Hardness of TC4 Titanium Alloy Manufactured via Selective Laser Melting

Development of AZ91D magnesium alloy-graphene nanoplatelets composites using thixomolding process

Microstructure and Mechanical Properties of TiC-Reinforced 316L Stainless Steel Composites Fabricated Using Selective Laser Melting