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Molecular dynamics simulation of tensile behavior of diffusion bonded Ni/Al nanowires
Zhenjiang Hu,Junjie Zhang,Yong Da Yan,Jiuchun Yan,Tao Sun,김동철,강성원 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.1
Interfaces play key roles in determining mechanical properties of materials. In current work we perform molecular dynamics simulations of diffusion bonding to evaluate the effect of temperature on the morphology of the Ni/Al interface and the strength of the diffusion bonded Ni/Al nanowires. The centro-symmetry parameter is adopted to identify defect atoms generated. Simulation results show that the thickness of the Ni/Al interface has strong dependence on the temperature of diffusion bonding. Following uniaxial tension tests indicate that the yield strength of Ni/Al nanowires is smaller than both the single crystalline Ni and Al nanowires, because of the Ni/Al interface acting as dislocation source and the mobilization of pre-existing dislocations at high temperature. It is shown that the mechanical properties of diffusion bonded Ni/Al nanowires strongly depend on the temperature.
Lu Dezhi,Yang Yang,Zhang Pingping,Ma Zhenjiang,Li Wentao,Song Yan,Feng Haiyang,Yu Wenqiang,Ren Fuchao,Li Tao,Zeng Hong,Wang Jinwu 한국조직공학과 재생의학회 2022 조직공학과 재생의학 Vol.19 No.6
Spinal cord injury (SCI) is a disabling and destructive central nervous system injury that has not yet been successfully treated at this stage. Three-dimensional (3D) bioprinting has become a promising method to produce more biologically complex microstructures, which fabricate living neural constructs with anatomically accurate complex geometries and spatial distributions of neural stem cells, and this is critical in the treatment of SCI. With the development of 3D printing technology and the deepening of research, neural tissue engineering research using different printing methods, bio-inks, and cells to repair SCI has achieved certain results. Although satisfactory results have not yet been achieved, they have provided novel ideas for the clinical treatment of SCI. Considering the potential impact of 3D bioprinting technology on neural studies, this review focuses on 3D bioprinting methods widely used in SCI neural tissue engineering, and the latest technological applications of bioprinting of nerve tissues for the repair of SCI are discussed. In addition to introducing the recent progress, this work also describes the existing limitations and highlights emerging possibilities and future prospects in this field.
Preparation and Performance Study of Self-Cleaning TiO2/Kaolin-Finished Cotton Fabric
Qiang Zhao,Yunting Zhang,Zhenjiang Liu,Huiyan Ma,Yan Li,Xiaoping Gao 한국섬유공학회 2023 Fibers and polymers Vol.24 No.12
TiO2/kaolin was first synthesized by using ultrasound-sol–gel method and then deposited onto the surface of cotton fabrics through two dipping and two rolling process. To investigate the properties of this TiO2/kaolin-finished cotton fabric, TiO2/kaolin/cotton composites were characterized by Fourier transform infrared spectrum and energy dispersive spectrometer, while the surface morphologies of the cotton fabrics were analyzed by field emission scanning electron microscopy. The whiteness, air permeability, breaking strength and elongation of TiO2/kaolin/cotton composites were, respectively, measured and the results showed that all these parameters decreased slightly with the appearance of TiO2/kaolin. The UPF value of TiO2/kaolin/cotton composites was significantly enhanced to 100+ , even if after soaping for 30 times, which might be due to the synergistic effect of kaolin and TiO2. In addition, the performance such as hand feel attributes, softness, smoothness and stiffness were measured by PhabrOmeter, respectively. The stiffness of all finished fabrics was obviously better than that of the unfinished cotton. However, the softness and smoothness of finished fabrics were slightly decreased compared to unfinished cotton. Rhodamine B was used as a test contaminant to qualitatively assess the self-cleaning properties of the TiO2/kaolin-finished cotton fabric. The removal of Rhodamine B indicated that the TiO2/kaolin-finished fabric exhibited excellent photocatalytic properties. This study illustrates the great potential of the low-cost kaolin powder as an efficient finishing agent for the fabric finishing process, and meanwhile provides a novel suggestion for fabric modification.