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Conjugated Polymers for Combatting Antimicrobial Resistance

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Chinese Journal of Chemistry 2022年第6期40卷 759-772页

作者： Zijuan Wang hao geng Chenyao Nie Chengfen Xing School of Materials Science and Engineering Hebei University of TechnologyTianjin 300130China Key Laboratory of Biotechnology and Pharmaceutical Engineering School of Pharmaceutical SciencesCixi Biomedical Research InstituteWenzhou Medical UniversityWenzhouZhejiang 325035China Key Laboratory of Hebei Province for Molecular Biophysics Institute of BiophysicsHebei University of TechnologyTianjin 300130China

Antimicrobial resistance(AMR)is one of the major challenges in pathogenic infections,which endangers human health and brings devastating public health ***,developing new materials to reduce the over-reliance on antibiotics or to replace antibiotics is in great need to solve this *** polymers(CPs)with excellent light-harvesting properties and good biocompatibility are ideal candidate materials for combat-ting AMR through photodynamic antimicrobial therapy(PACT)by sensitizing oxygen and photothermal therapy(PTT)by light to heat ***-nificant works of CPs-based antimicrobial approaches have been reported in recent ***,we summarize the types of CPs-based antimicrobial materials,illustrate their antimicrobial mechanisms,and discuss their applications in combating AMR mainly by PACT or antimicrobial *** addi-tion,we proposed some other antimicrobial treatment strategies based on CPs,hoping to provide inspiring insight for overcoming AMR.

关键词： Polymers Antimicrobial resistance Photochemistry Materials science Phototherapy

Effects of P addition on the microstructure and mechanical properties of Mg–5%Sn–1.25%Si alloy

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International Journal of Minerals,Metallurgy and Materials 2014年第3期21卷 289-294页

作者： hao-ran geng Qing-lei Wang Peng Liu Ming Wu School of Material Science and Engineering University of Jinan Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials University of Jinan Jinan Jinzhong Electronic Scale Company Ltd.

The effects of Al-P addition on the microstructure and mechanical properties of as-cast Mg–5%Sn–1.25%Si magnesium alloy were investigated. The results show that the phases of the as-cast alloy are composed of α-Mg, Mg2 Sn, Mg2 Si, little P, and AlP. The Chinese character shape Mg2 Si phase changes into a granular morphology by P addition because AlP can act as a heterogeneous nucleation core for the Mg2 Si phase. When 0.225wt% of Al–3.5%P alloy is added, the mechanical properties of the Mg–5%Sn–1.25%Si alloy are greatly improved, and the tensile strength increases from 156 to 191 MPa, an increase of 22.4% compared to the alloy without P addition. When the amount of Al–3.5%P reaches 0.300wt%, a segregation phenomenon occurs in the granular Mg2 Si phase, and the tensile strength and hardness decrease though the elongation increases.

关键词： magnesium alloys microstructure mechanical properties phosphorus

Refinement of primary Si in Cu-50Si alloys with novel Al-Zr-P master alloy

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Rare Metals 2013年第3期32卷 252-257页

作者： Min Zuo Zhong-Shi Zhang Xin-Ying Teng hao-Ran geng Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials School of Materials Science and Engineering University of Jinan School of Physics and Technology University of Jinan

In this article, a novel Al-6Zr-2P master alloy with ZrP particles was successfully synthesized, and the refining performance of this novel master alloy for the primary Si in Cu-50Si alloys was also investigated. By means of the fracture plane observation, it is found that the ZrP phase would precipitate first in the solidification pro- cess, and then, the ZrAl3 phase grows around them. Fur- thermore, it is observed that the refining effect can be remarkably improved by changing the addition sequence of the raw materials. After the melting of commercial Cu, the 2.0 wt% Al-6Zr-2P master alloy and crystalline Si were added in sequence, and the mean size of the primary Si in Cu-50Si alloy can be significantly refined from 255.7 to 75.3 gm. Meanwhile, the refining mechanism was dis- cussed in detail.

关键词： Al-Zr-P master alloy Cu-Si alloy ZrP Microstructure Phase transformation

Glass-forming ability, microhardness, corrosion resistance, and dealloying treatment of ***40Ndx alloy ribbons

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International Journal of Minerals,Metallurgy and Materials 2017年第6期24卷 708-717页

作者： hao-yi Chi Zhen-gui Yuan Yan Wang Min Zuo De-gang Zhao hao-ran geng Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials School of Materials Science and Engineering University of Jinan Jinan 250022 China

The influence of Nd addition on the glass-forming ability (GFA), microhardness, and corrosion resistance of Mg60−xCu40Ndx(x = 5, 10, 15, 20, and 25, at%) alloys were investigated by differential scanning calorimetry, Vickers-type hardness tests, and electrochemical methods. The results suggest that the GFA and microhardness of the amorphous alloys increase until the Nd content reaches 20at%. The corrosion potential and corrosion current density obtained from the Tafel curves indicate that the Mg35Cu40Nd25ternary alloy exhibits the best corrosion resistance among the investigated alloys. Notably, nanoporous copper (NPC) was synthesized through a single-step dealloying of Mg60−xCu40Ndx(x = 5, 10, 15, 20, and 25) ternary alloys in 0.04 mol·L−1H2SO4solution under free corrosion conditions. The influence of dealloying process parameters, such as dealloying time and temperature, on the microstructure of the ribbons was also studied using the surface diffusivity theory. The formation mechanism of dealloyed samples with a multilayered structure was also discussed. © 2017, University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg.

关键词： Corrosion Corrosion resistance Differential scanning calorimetry Glass Microhardness Neodymium alloys Ternary alloys

Microstructure and properties of SiC gradiently coated C_f/C composites prepared by a RCLD method

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International Journal of Minerals,Metallurgy and Materials 2009年第3期16卷 334-338页

作者： Jun-hua Chen Guang-li Chen hao-ran geng Yan Wang School of Materials Science and Engineering Shandong University Jinan 250061 China School of Materials Science and Engineering University of Jinan Jinan 250022 China

The SiC gradiently coated carbon fiber/carbon （Cf/C） composites were prepared by a two-step rapid chemical liquid deposition （RCLD） method. The microstructure and properties of the composites were investigated using X-ray diffraction, scanning electron microscopy together with energy dispersive X-ray analysis, bending tests, and oxidation tests. The experimental results show that the surface layer of the composites is composed of SiC, pyrocarbon, and carbon fibers. Their inner area consists of pyrocarbon and carbon fibers. The SiC content gradiently decreases with increasing distance from the outer surface to the center of the composites. Furthermore, the thickness of the SiC layer increases with increasing tetraethylorthosilicate content and deposition time. SiC coatings have no significant influence on the bending strength of the composites. However, the oxidation resistance of the composites increases with increasing thickness of the SiC layer.

关键词： carbon fiber reinforced composites chemical liquid deposition bending strength oxidation resistance

Strategies for Inhibition and Disaggregation of Amyloid-β Fibrillation

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Chinese Journal of Chemistry 2022年第4期40卷 524-538页

作者： hao geng Dong Gao Zijuan Wang Xiaoning Liu Zhanshuo Cao Chengfen Xing School of Materials Science and Engineering Hebei University of TechnologyTianjin 300130China Key Laboratory of Hebei Province for Molecular Biophysics Institute of BiophysicsSchool of ScienceHebei University of TechnologyTianjin 300130China College of Chemical Engineering Hebei University of TechnologyTianjin 300130China

Comprehensive Summary Amyloid-β protein(Aβ)is a fatal cause of Alzheimer's disease,which can trigger a series of cytotoxicity by the abnormal aggregation of Aβ in human *** strategies for inhibition and disaggregat... 详细信息

关键词： Amyloid beta-peptides Inhibition and disaggregation Materials science Photooxidation Photothermal effect

Topographic controls on the annual runoff coefficient and implications for landscape evolution across semiarid Qilian Mountains, NE Tibetan Plateau

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Journal of Mountain Science 2020年第2期17卷 464-479页

作者： CAI Shun geng hao-peng PAN Bao-tian HONG Yang CHEN Li-ping Key Laboratory of Western China’s Environmental Systems (Ministry of Education) College of Earth and Environmental Sciences Lanzhou University

The combination of different topographic and climatic conditions results in varied precipitation-runoff relations, which in turn influences hillslope erosion, sediment transport and bedrock incision across mountainous landscapes. The runoff coefficient is a suitable tool to represent precipitation-runoff relations, but the spatial distribution of the runoff coefficient across tectonically active mountains in semi-arid environments has received little attention because of limited data availability. We calculated annual runoff coefficients over 22 years for 26 drainage basins across the semi-arid Qilian Mountains based on:(i) annual discharge records;and(ii) the China Meteorological Forcing Dataset to enhance our understanding of the precipitation-runoff processes. The mean annual runoff coefficients show no obvious spatial trends. When compared to potential controlling factors, mean annual runoff coefficients are highly correlated with mean slope rather than any climatic characteristics(e.g., mean annualprecipitation and Normalized Difference Vegetation Index). The slope-dependent runoff coefficient could theoretically have enhanced the topographic control on erosion rates and dampen the influence of precipitation. The enhanced discharge for drainage basins with less precipitation but steep topography in the western Qilian Mountains will enable fluvial incision to keep pace with ongoing uplift caused by the northward growth of the Qilian Mountains. The geomorphic implications are that tectonic rather than climatic factors are more significant for long-term landscape evolution in arid and semi-arid contexts.

关键词： Landscape evolution Precipitation-runoff process Qilian mountains Semiarid environments

Effects of lanthanum on properties of cathode materials and ion implanted spinning rings

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中国有色金属学会会刊：英文版 2004年第Z1期14卷 278-281页

作者： ZOU Qing-hua ZHANG De-yuan Zhao hao-min geng Man WANG Zhen-guo Electromechanical Department Wuhan University of Science and Engineering Wuhan 430073 China National Research and Development Centre for Surface Engineering of China Shenzhen 518029 China National Research and Development Centre for Surface Engineering of China Shenzhen 518029 China National Research and Development Centre for Surface Engineering of China Shenzhen 518029 China Electromechanical Department Wuhan University of Science and Engineering Wuhan 430073 China

The effects of rare earth elements on the structure of cathode materials composed of WC, 663Cu and Ti as well as the performances of spinning rings implanted with this cathode materials were investigated. The results show that rare earth elements can improve the microstructure and compactness of the cathode materials, and elevate the wear resistance and corrosion resistance of spinning rings implanted with these materials. Consequently, the yarn quality is improved significantly.

关键词： spinning ring ion implantation rareearth wear resistance

Microstructural evolution and mechanical behavior of in situ synthesized MgAl_(2)O_(4)whiskers reinforced 6061 Al alloy composite after hot extrusion and annealing

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Rare Metals 2023年第5期42卷 1732-1742页

作者： geng hao Chun-Sheng Shi Nai-Qin Zhao En-Zuo Liu Chun-Nian He Fang He Li-Ying Ma School of Materials Science and Engineering Tianjin UniversityTianjin 300350China Tianjin Key Laboratory of Composite and Functional Materials Tianjin UniversityTianjin 300350China Collaborative Innovation Centre of Chemical Science and Engineering Tianjin 300072China

In situ synthesized MgAl2O4whiskers reinforced 6061 Al alloy composites were fabricated by a powder metallurgy ***-sized MgAl2O4spinel whiskers distributed uniformly in 6061 Al alloy matrix without any interfacial product and laid along the extrusion direction after hot ***-extruded composite samples were annealed at 530,580,600 and 630℃for 1 h and examined by electron backscattered diffraction to investigate the recrystallization behavior of obtained *** and texture evolution was investigated,and it is found that the recrystallization process is inhibited by whiskers because of Zener *** fibrous grains remain until 630℃,and deformation textures still exist even in specimen annealed at 630℃.Hardness and tensile tests show that the completely recrystallized sample has an ultimate tensile strength of 218 MPa and a hardness of HV52 compared with 283 MPa and HV 69 of the unannealed *** properties of the annealed samples decline slightly with annealing temperature increasing up to 600℃.

关键词： Composite In situ synthesized whiskers Recrystallization Microstructure Texture