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214 results on '"Wang, Yinmin"'

7. Effect of Enhanced Thermal Stability of Alumina Support Layer on Growth of Vertically Aligned Single-Walled Carbon Nanotubes and Their Application in Nanofiltration Membranes

Author

In, Jung Bin, Cho, Kang Rae, Tran, Tung Xuan, Kim, Seok-Min, Wang, Yinmin, Grigoropoulos, Costas P, Noy, Aleksandr, and Fornasiero, Francesco

Subjects
Engineering, Aerospace Engineering, Nanotechnology, Bioengineering, Single-walled carbon nanotube, Catalyst, Alumina, CNT membrane, Condensed Matter Physics, Materials Engineering, Nanoscience & Nanotechnology, Materials engineering, Condensed matter physics
Abstract

We investigate the thermal stability of alumina supporting layers sputtered at different conditions and its effect on the growth of aligned single-walled carbon nanotube arrays. Radio frequency magnetron sputtering of alumina under oxygen-argon atmosphere produces a Si-rich alumina alloy film on a silicon substrate. Atomic force microscopy on the annealed catalysts reveals that Si-rich alumina films are more stable than alumina layers with low Si content at the elevated temperatures at which the growth of single-walled carbon nanotubes is initiated. The enhanced thermal stability of the Si-rich alumina layer results in a narrower (

Published
2018

30. Measurement on critical shear stress of circular point contact utilizing Atomic Force Microscope

Author

Xuejun Zheng, Xinyang Yan, Jinfeng Peng, Wang Yinmin, and Sisi Liu

Subjects
Materials science, Graphene, Mechanical Engineering, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Nanomaterials, law.invention, Mechanical system, Shear (geology), Mechanics of Materials, law, Critical resolved shear stress, 0103 physical sciences, Monolayer, Nanotribology, General Materials Science, Composite material, 010306 general physics, 0210 nano-technology, Nanosheet
Abstract

We propose Bowdon-Johnson-Kendall-Roberts model to measure the critical shear stress of circular point contact, and the critical shear stress map is constructed through the lateral force mode and force map mode of Atomic Force Microscope to research the interface property of nanomaterials. The mean critical shear stresses are measured as 0.24 MPa for monolayer MoS2 and 0.69 MPa for graphene. MoS2 nanosheet and graphene are of the lower critical shear stress and friction coefficient than those of the bulk materials, which are good agreement with the regularities in nanotribology. The critical shear stress can be used to not only quantitatively characterize the frictional properties, but also analyze the friction at different loading stages. The critical shear stress map would play an important role in sliding contact of nanomaterials for the drive part design and nanotribological reliability of nanoelectronic mechanical system.

Published
2018

32. Investigation of miR‐126‐3p loaded on adipose stem cell‐derived exosomes for wound healing of full‐thickness skin defects.

Author

Ma, Jie, Zhang, Zhaofeng, Wang, Yinmin, and Shen, Hua

Subjects
WOUND healing, EXOSOMES, FAT cells, STEM cells, UMBILICAL veins
Abstract

Objective: To investigate the function of miR‐126‐3p loaded on adipose stem cell (ADSC)‐derived exosomes (ADSC‐Exos) in wound healing of full‐thickness skin defects. Methods: ADSCs transfected with miR‐126‐3p mimic, miR‐126‐3p inhibitor or pcDNA3.1‐PIK3R2, or PKH26‐marked ADSC‐Exos were cultured with fibroblasts or human umbilical vein endothelial cells (HUVECs). The proliferation and migration rates of fibroblasts and angiogenesis of HUVECs were measured. Rats with full‐thickness skin defects were injected with ADSC‐Exos or exosomes extracted from ADSCs transfected with miR‐126‐3p inhibitor and the wound healing rates were measured. The wound bed, collagen deposition and angiogenesis in injured rats were assessed. Results: ADSC‐Exos could be ingested by fibroblasts and HUVECs. Co‐incubation with ADSCs or ADSC‐Exos promoted the proliferation and migration of fibroblasts and angiogenesis of HUVECs, which was further enhanced by miR‐126‐3p overexpression. Inhibition of ADSC‐Exos or miR‐126‐3p or PIK3R2 overexpression suppressed the proliferation and migration of fibroblasts and angiogenesis of HUVECs. ADSC‐derived exosomal miR‐126‐3p increased wound healing rate, collagen deposition and newly formed vessels in the injured rats. Conclusion: ADSC‐derived exosomal miR‐126‐3p promotes wound healing of full‐thickness skin defects by targeting PIK3R2. [ABSTRACT FROM AUTHOR]

Published
2022
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45. Sonication-Assisted Synthesis of Molybdenum Disulfide Aerogel for the Electrode Materials of Supercapacitors

Author

He Wenyuan, Xue Jun Zheng, Dazhao Pei, Wang Yinmin, and Qiang Zhang

Subjects
Supercapacitor, chemistry.chemical_compound, Electrode material, Materials science, chemistry, Chemical engineering, Sonication, Specific surface area, General Materials Science, Aerogel, Condensed Matter Physics, Molybdenum disulfide
Abstract

The sonication processing was added in front of the freeze-drying as an intermediate processing before the molybdenum disulfide (MoS2) aerogel was synthesized. It is distinguishing with the traditional hydrothermal reaction to combine the sonication processing and freeze-drying in our method. The structure, morphology, specific surface area and pore size distribution were characterized, and the electrochemical performances were measured in 0.5[Formula: see text]M Na2SO4 electrolyte for the MoS2 aerogel and flower-like MoS2. As for comparison, they are of porous structure and microsphere structure, and their specific surface areas are 55.14[Formula: see text]m2[Formula: see text]g[Formula: see text] and 38.12[Formula: see text]m2[Formula: see text]g[Formula: see text]. The specific capacitances are 166.7[Formula: see text]F[Formula: see text]g[Formula: see text] and 119.2[Formula: see text]F[Formula: see text]g[Formula: see text] at the scan rate of 5[Formula: see text]mV[Formula: see text]s[Formula: see text], and the capacity retentions are 87.7% and 81.6% after 3000 charge/discharge cycles. For the enhanced mechanism, the high specific surface of the MoS2 aerogel causes high specific capacitance, and the unique porous structure could buffer volume expansion to improve retention ability during charge/discharge processes. The MoS2 aerogel may thus be a promising electrode material for supercapacitors.

Published
2019

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