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In vitro evaluation of degradation,cytocompatibility and antibacterial property of polycaprolactone/hydroxyapatite composite coating on bioresorbable magnesium alloy

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Journal of Magnesium and Alloys 2022年第8期10卷 2252-2265页

作者： zhang Chunyan Cheng Lan Lin Jiajia Sun Dongwei zhang Jun Liu Huinan School of Materials Science&Engineering Chongqing University of TechnologyNo.69 Hongguang AvenueChongqing 400054China Department of Bioengineering and the Materials Science and Engineering ProgramUniversity of CaliforniaRiverside900 University AvenueMSE 205RiversideCA 92521USA

Polycaprolactone/hydroxyapatite(PCL/HA)composite coating was fabricated by a combination of hydrothermal and dipping methods to delay the degradation of Mg alloy AZ31 as bioresorbable *** PCL/HA coating was composed of nano rod-shape HA crystals and PCL filled in the space of HA *** with the single HA coating,the binding strength between the PCL/HA composite coating and Mg alloy was obviously improved and the PCL/HA coating still adhered to the surface of AZ31 substrate even after 38 days of *** electrochemical corrosion rate of HA coated sample was reduced by ten times after being filled by *** electrochemical impedance spectroscopy(EIS)and immersion test results showed that the PCL/HA composite coating could provide a more effective barrier for Mg substrate than the HA coating *** cytocompatibility and the antibacterial property of HA coating and PCL/HA coating were evaluated by culturing with bone marrow-derived mesenchymal stem cells(BMSCs)and methicillin-resistant staphylococcus aureus(MRSA)for 24 h under direct culture conditions,*** PCL/HA composite coating showed better BMSC cell compatibility,more suitable for BMSC adhesion than HA coating alone and showed a potential application prospect as a biological ***,from the perspective of clinical applications,the antibacterial property of PCL/HA composite coating needs to be further improved.

关键词： Mg alloy PCL/HA coating Corrosion resistance Cytocompatibility Antibacterial property

Heat dissipation of carbon shell in ZrC-SiC/TaC coating to improve protective ability against ultrahigh temperature ablation

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Journal of Advanced Ceramics 2024年第7期13卷 1080-1091页

作者： Yuyu zhang Xuemeng zhang Hongkang Ou Bozhe Wang Jia Sun Qiangang Fu Science and Technology on Thermostructural Composite Materials Laboratory Shaanxi Key Laboratory of Fiber Reinforced Light-Weight CompositesNorthwestern Polytechnical UniversityXi’an 710072China System Design Institute of Hubei Aerospace Technology Academy Wuhan 430040China

To efficiently decrease ablation heat accumulation and improve the ability of ZrC-SiC/TaC coatings to protect carbon/carbon(C/C)composites,a thermally conductive nanonetwork with a ceramic@carbon core-shell structure was designed and ***-derived SiC/TaC with a graphene carbon shell was synthesized and introduced into a ZrC coating by supersonic atmospheric plasma spraying(SAPS).Graphene shell paths increased the heat transfer capability by lowering the surface temperature to approximately 200℃during oxyacetylene *** heat dissipation of the graphene shell in the ZrC-SiC/TaC@C coating reduced the volatilization of low-melting-point phases and delayed the sintering of ZrO_(2) ***,the graphene shell in ZrC-SiC/TaC@C coating decreased the mass and linear ablation rates by 91.4%and 93.7%compared to ZrC-SiC/TaC coating,*** work provided a constructive idea for improving the ablation resistance of the coatings by incorporating carbon nanomaterials as a function of heat dissipation.

关键词： carbon/carbon(C/C)composites carbon nanomaterials core-shell structure polymer-derived ceramic(PDC) ablation resistance

A metamaterial-free fluid-flow cloak

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National Science Review 2022年第9期9卷 212-218页

作者： Fuyang Tay Youming zhang Hongyi Xu Honghui Goh Yu Luo Baile zhang Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University School of Electrical and Electronic Engineering Nanyang Technological University Centre for Disruptive Photonic Technologies Nanyang Technological University

The model of ide al fluid flow around a cylindrical obstacle exhibits a long-established physical picture,where originally straight streamlines are deflected over the whole space by the *** by transformation optics and metamaterials,recent theories have proposed the concept of fluid cloaking,which is able to recover the straight streamlines,as if the obstacle did not ***,such a cloak,similar to all previous transformation-optics-based devices,relies on complex metamaterials with inhomogeneous parameters and is difficult to *** we deploy the theory of scattering cancellation and report on the experimental realization of a fluid-flow cloak without *** clo ak is realized by engineering the geometry of the fluid channel,which effectively cancels the dipole-like scattering of the *** clo aking effect is demonstrated through the direct observation of recovered straight streamlines in the fluid *** work sheds new light on conventional fluid control and may find application in microfluidic devices.

关键词： invisibility cloaks metamaterials fluid-flow control

Commercial Application of Novel Heavy Oil Catalytic Cracking Catalyst HSC

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China Petroleum Processing & Petrochemical Technology 2017年第1期19卷 11-18页

作者： zhang Zhimin Qilu Branch of SINOPEC Catalyst Co. LTD Zibo 255336

The commercial application of a novel RFCC catalyst HSC used in an 1.4 Mt/a RFCC unit at a refinery A was introduced. The application results show that in comparison with the base catalyst, the yield of dry gas and slurry was reduced, while the total liquid yield, gasoline yield and LPG yield increased by 1.34, 5.05 and 1.43 percentage points,respectively. The properties of the products showed no significant change while the anti-abrasion strength of the catalyst was relatively high. Based on the mid-term calibration test, the summary calibration test and the daily statistics of long term industrial application practice, the HSC catalyst features a strong conversion ability of heavy oil, a high gasoline yield, a satisfactory product distribution and a good selectivity.

关键词： heavy oil FCC catalyst industrial application structural stability

A route for large-scale preparation of multifunctional superhydrophobic coating with electrochemically-modified kaolin for efficient corrosion protection of magnesium alloys

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Journal of Magnesium and Alloys 2022年第11期10卷 3082-3099页

作者： Xiang Liu Tian C.zhang Yuxin zhang Jinsong Rao Shaojun Yuan Low-carbon Technology&Chemical Reaction Engineering Lab College of Chemical EngineeringSichuan UniversityChengdu 610065China Civil&Environmental Engineering Department University of Nebraska-LincolnOmahaNE 68182-0178USA State Key Laboratory of Mechanical Transmissions College of Materials Science and EngineeringChongqing UniversityChongqing 400044China

Superhydrophobic coating has been widely studied for its great applicational potential, such as for corrosion protection of magnesium alloys while it has been restrained by expensive materials, sophisticated preparation process and infirm rough structures. In this study, the electrochemical method was adopted by using a two-electrode system for rapid hydrophobic modification to obtain superhydrophobic *** mixing the modified superhydrophobic kaolin with commercial epoxy resin and polydimethylsiloxane glue, a paint can be formed and easily used on various substrates for preparation of superhydrophobic coating via spraying method. The influence factors on wettability of the modified kaolin and the mixing ratio of each component of the coating were explored. Also, the wettability, durability and anticorrosion of the prepared coating were evaluated comprehensively. The coating was able to maintain superhydrophobic after immersed in HCl solution at pH 1, the NaOH solution at pH 14, and 3.5 wt.% NaCl solution for 16, 21, 30 days, respectively. In addition, the coating exhibited 4A grade adhesion, high hydrophobicity after abraded for 200 cycles on a 600-mesh sandpaper with 100 g weight, and 99.86% anticorrosion efficiency after soaked in 3.5 wt.% NaCl solution for 20 days, demonstrating a good robustness and anti-corrosion property. Furthermore, the coating showed good transparency, flexibility and was easy to make in a large scale by the spraying method, which is of great significance to promote the practical application of superhydrophobic coatings and the anticorrosion Mg alloys.

关键词： Superhydrophobic coating Large-scale application Magnesium alloys Corrosion protection

Deformation behavior of a TiZr-based metallic glass composite containing dendrites in the supercooled liquid region

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Journal of Materials Science & Technology 2020年第2期37卷 64-70页

作者： Longjun Wu Zhengwang Zhu Dingming Liu Huameng Fu Hong Li Aimin Wang Hongwei zhang Zhengkun Li Long zhang Haifeng zhang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei230026China Dongguan Eontec Co. LtdDongguan523662China Shenyang Amorphous Metal Manufacturing Co. Ltd.Shenyang110000China

The deformation behavior of a TiZr-based bulk metallic glass composite(BMGC)was characterized in the supercooled liquid region(SLR)from 623 K to 693 *** was observed that the alloy exhibits the deformation behavior from work softening at low temperatures to work hardening at high *** yield stress and overshoot stress decrease remarkably with the increase of temperature,accompanied by *** results showed that the crystallization occurred in the amorphous matrix for the post-deformation samples and the volume fraction of the corresponding crystallization products increased with increasing testing *** is implied that the work hardening behavior was closely associated with the crystallization of the amorphous *** tensile stress can accelerate the crystallization of amorphous matrix and the martensitic transformation of dendrite phases,which implies that the thermal stability of the alloy decreases under *** findings shed light on designing new BMGCs with high mechanical performance as well as the good SLR formability.

关键词： Bulk metallic glass composite Tension Work hardening ability Superplasticity Crystallization

A self-supported heterogeneous bimetallic phosphide array electrode enables efficient hydrogen evolution from saline water splitting

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Nano Research 2023年第3期16卷 3658-3664页

作者： Jingwen Li Min Song Yezhou Hu Chang zhang Wei Liu Xiao Huang Jingjing zhang Ye Zhu Jian zhang Deli Wang Key Laboratory of Material Chemistry for Energy Conversion and Storage(Huazhong University of Science and Technology) Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China Department of Applied Physics Research Institute for Smart EnergyThe Hong Kong Polytechnic UniversityHung HomKowloonHongkong 999077China

Hydrogen generation from water splitting is of great prospect for the sustainable energy ***,it is still challenging to explore stable and high-performance electrocatalysts toward hydrogen evolution reaction(HER)from saline water such as seawater due to the chloride ***,we developed a self-supported heterogeneous bimetallic phosphide(Ni_(2)P-FeP)array electrode that possesses excellent HER performance in alkaline saline water with an overpotential of 89 mV at 10 mA·cm^(−2)and long-term stability over 90 h at 200 mA·cm^(−2).The analysis showed that the heterostructure between the interfaces of Ni_(2)P-FeP plays a pivotal role in promoting the activity of ***,the bimetallic phosphide nanoarrays can be employed as a shield for chlorine-corrosion resistance in the saline water,ensuring the long-term durability of hydrogen *** employed for alkaline saline water electrolysis,a current density of 100 mA·cm^(−2)is achieved at cell voltage of 1.68 *** work presents an effective approach for the fabrication of high-performance electrode for HER in alkaline saline environments.

关键词： saline water splitting hydrogen evolution reaction bimetallic phosphides chlorine-corrosion resistance

Antibody Therapies Targeting Complex Membrane Proteins

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Engineering 2021年第11期7卷 1541-1551页

作者： Georgina To’a Salazar Ziyi Huang Ningyan zhang Xue-Guang zhang Zhiqiang An Texas Therapeutics Institute Brown Foundation Institute of Molecular MedicineThe University of Texas Health Science Center at HoustonHoustonTX 77030USA Jiangsu Institute of Clinical Immunology The First Affiliated Hospital of Soochow UniversitySuzhou 215123China Jiangsu Key Laboratory of Clinical Immunology Soochow UniversitySuzhou 215123China Jiangsu Key Laboratory of Gastrointestinal Tumor Immunology The First Affiliation Hospital of Soochow UniversitySuzhou 215123China State Key Laboratory of Radiation Medicine and Protection Soochow UniversitySuzhou 215123China

In analyses of protein families that may serve as drug targets,membrane-associated G-protein-coupled receptors(GPCRs)dominate,followed by ion channels,transporters,and—to a lesser extent—membrane-bound ***,various challenges put such membrane proteins among key groups of underutilized opportunities for the application of therapeutic *** hold the promise of exquisite specificity,as they are able to target even specific conformations of a particular membrane protein,as well as adaptability through engineering into various antibody ***,the ease of raising and isolating specific,effective antibodies targeting membrane proteins depends on many *** particular,the generation of specific antibodies is easier when targeting larger,simpler,extracellular domains with greater uniqueness of amino acid *** rareness of such ideal conditions is illustrated by the limited number of approved biologics for targeting GPCRs and other complex membrane *** in developing antibodies to complex membrane proteins such as GPCRs,ion channels,transporters,and membrane-bound enzymes can be addressed by the design of the antigen,antibody-generation strategies,lead optimization technologies,and antibody modalities.A better understanding of the membrane proteins being targeted would facilitate mechanism-based drug *** review describes the advantages and challenges of targeting complex membrane proteins with antibodies and discusses the preparation of membrane protein antigens and antibody generation,illustrated by select examples of success.

关键词： Antibody therapy Complex membrane protein Ion channels Transporters Membrane-bound enzymes GPCRs Drug discovery

Supercritical CO2 produces the visible-light-responsive TiO2/COF heterojunction with enhanced electron-hole separation for highperformance hydrogen evolution

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Nano Research 2020年第4期13卷 983-988页

作者： Lifei Liu Jianling zhang Xiuniang Tan Bingxing zhang Jinbiao Shi Xiuyan Cheng Dongxing Tan Buxing Han Lirong Zheng Fanyu zhang Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of ColloidInterface and Chemical ThermodynamicsCASResearch/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China Physical Science Laboratory Huairou National Comprehensive Science CenterBeijing 101400China Beijing Synchrotron Radiation Facility(BSRF) Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China

To construct the heterojunctions of TiO2 with other compounds is of great importance for overcoming its inherent shortages and improving the visible-light photocatalytic *** we propose the construction of TiO2/covalent organic framework(COF)heterojunction with tight connection by a supercritical CO2(SC CO2)method,which helps bridging the transformation paths for photo-induced charge between T i02 and *** produced T i02/COF heterojunction performs a H2 evolution of 3,962 nmol·g^-1·h^-1 under visible-light irradiation,which is-25 times higher than that of pure TiO2 and 4.5 folds higher than that of TiO2/COF synthesized by the conventional solvothermal *** study opens up new possibilities for constructing heterojunctions for solar energy utilization.

关键词： supercritical CO2 covalent organic fram ework(COF) TiO2 H2 production visible light