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Impact of Various Charge States of Hydrogen on Passivation of Dislocation in Silicon
Lihui Song,Jingjing Lou,Jiayi Fu,Zhenguo Ji 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.5
Dislocation, one of typical crystallographic defects in silicon, is detrimental to the minority carrier lifetime of silicon wafer. Hydrogen passivation is able to reduce the recombination activity of dislocation, however, the passivation efficacy is stronglydependent on the experimental conditions. In this paper, a model based on the theory of hydrogen charge state control isproposed to explain the passivation efficacy of dislocation correlated to the peak temperature of thermal annealing and illuminationintensity. Experimental results support the prediction of the model that a mix of positively charged hydrogen andnegatively charged hydrogen at certain ratio can maximise the passivation efficacy of dislocation, leading to a better powerconversion efficiency of silicon solar cell with dislocation in it.
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Nanotherapeutics with immunoregulatory functions for the treatment of bacterial infection
Dongliang Yang,Meng Ding,Yanni Song,Yanling Hu,Weijun Xiu,Lihui Yuwen,Yannan Xie,Yingnan Song,Jinjun Shao,Xuejiao Song,Heng Dong 한국생체재료학회 2023 생체재료학회지 Vol.27 No.00
The advent of drug-resistant pathogens results in the occurrence of stubborn bacterial infections that cannot betreated with traditional antibiotics. Antibacterial immunotherapy by reviving or activating the body’s immune systemto eliminate pathogenic bacteria has confrmed promising therapeutic strategies in controlling bacterial infections. Subsequent studies found that antimicrobial immunotherapy has its own benefts and limitations, such as avoidingrecurrence of infection and autoimmunity-induced side efects. Current studies indicate that the various antibacterialtherapeutic strategies inducing immune regulation can achieve superior therapeutic efcacy compared with mono therapy alone. Therefore, summarizing the recent advances in nanomedicine with immunomodulatory functionsfor combating bacterial infections is necessary. Herein, we briefy introduce the crisis caused by drug-resistantbacteria and the opportunity for antibacterial immunotherapy. Then, immune-involved multimodal antibacterialtherapy for the treatment of infectious diseases was systematically summarized. Finally, the prospects and challengesof immune-involved combinational therapy are discussed.
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Study on Electro-Spark Deposition Welding of Ultra-thin Sheet of Ti-6.5Al-1Mo-1 V-2Zr Alloy
Fei Liu,Tao Chen,Lihui Pang,Kuijing Song,Yucheng Wu 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.10
In this work, butt welding experiment of Ti-6.5Al-1Mo-1 V-2Zr alloy sheet of 0.5 mm thickness was performed via electro-spark deposition method. The results of the experiment indicate that the reactive titanium alloy’s surface is free from oxidation without trailing shielding protection due to low heat input and rapid thermal cycles associated with the process. The fusion zone is mainly composed of equiaxed microstructure of martensite α′ and α dual phases, wherein the amount of α′ in the central joint is higher than that adjacent to the base metal. The maximum tensile strength of the welded joint can reach 1187 MPa, which is 95% of the base metal. Besides, the joint shows obvious plastic deformation before fracture. The findings have demonstrated the possibility of widely applying the welding methodology to thin sheets of titanium alloys.
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Xiong Xu,Jianying Yu,Canlin Zhang,Song Xu,Lihui Xue,Dong Xie 한국고분자학회 2016 폴리머 Vol.40 No.6
Aging behavior and thermal stability of styrene-butadiene-styrene tri-block copolymer (SBS) in blends were investigated using Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and thermo-gravimetric analysis (TG). From the analysis of FTIR, the alcohol and carboxyl hydroxyl groups will be gradually generated during the thermal and ultraviolet aging, and the effect of short-term high temperature is more serious than longterm ultraviolet exposure on the structure of SBS; XPS results show that oxygen/carbon ratio of thermal and ultraviolet aged SBS have significantly increased, while the relative concentration of C-O-H(R) is far higher than that of COOH(R); inferred oxidation mechanism of SBS based on the analytical results of FTIR and XPS shows alcohol, carboxyl, ether, ketone, etc. have mainly formed in blends after thermal or ultraviolet aging; moreover, on account of the distribution index of carbon-oxygen binding state of thermal and ultraviolet aged SBS(respectively 3.15 and 1.28), C-O is easily produced than C=O and the effect of thermal aging is more obvious; from the results of TG, the maximum decomposition rate and temperature decrease after aging.
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