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Mg-Based Micromotors with Motion Responsive to Dual Stimuli

研究（英文） 2020年第3期 104-115页

作者： Kang Xiong Leilei Xu Jinwei Lin Fangzhi Mou Jianguo Guan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China

Mg-based micromotors have emerged as an extremely attractive artificial micro/nanodevice,but suffered from uncontrollable propulsion and limited motion lifetime,restricting the fulfillment of complex ***,we have demonstrated Mg-based micromotors composed of Mg microspheres asymmetrically coated with Pt and temperature-sensitive poly(N-isopropylacrylamide) (PNIPAM) hydrogel layers in *** can implement different motion behaviors stemming from the driving mechanism transformation when encountering catalyzed substrates such as H2O2 and respond to both H2O2 concentration and temperature in aqueous *** as-constructed Mg-based micromotors are self-propelled by Pt-catalyzed H2O2 decomposition following the self-consuming Mg-H2O *** this case,they could further generate bilateral bubbles and thus demonstrate unique self-limitation motion like hovering when the phase transformation of PNIPAM is triggered by decreasing temperature or when the H2O2 concentration after permeating across the PNIPAM hydrogel layer is high enough to facilitate bubble *** work for the first time provides a stimuli-induced 'hovering' strategy for self-propelled micromotors,which endows Mg-based micromotors with an intelligent response to the surroundings besides the significant extension of their motion lifetime.

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In-Situ Crystalline Cr3c2 and Amorphous Sio2 Dual-Particles Reinforced Nicr-Based Composites

SSRN

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SSRN 2023年

作者： Hu, Guangmin Han, Yanfeng Liu, Sida Yu, Biao Tang, Wenqi Li, Dong Xing, Hui Liu, Xiangfa Zhang, Jiao Sun, Baode Shanghai Key Lab of Advanced High-Temperature Materials and Precision Forming School of Materials Science and Engineering Shanghai Jiao Tong University No. 800 Dongchuan Road Shanghai200240 China Institute for Advanced Technology Shandong University No. 17923 Jingshi Road Shandong Jinan250061 China Key Lab for Liquid–Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University No. 17923 Jingshi Road Shandong Jinan250061 China State Key Lab of Metal Matrix Composites Shanghai Jiao Tong University No. 800 Dongchuan Road Shanghai200240 China

Strength and ductility of structural materials are mutually exclusive in general due to the strength-ductility trade-off. Using in-situ pyrolysis of polycarbosilane in NiCr powder green compacts, we fabricated NiCr-based composites with micro-sized crystalline Cr3C2 and amorphous SiO2 dual-particles. Tensile tests show that the NiCr-based composites have a combination of high strength and ductility with the yield strength, ultimate tensile strength and ductility as 449 MPa, 838 MPa and 20.5%, respectively. The amorphous SiO2 and crystalline Cr3C2 particles exhibit plastic deformation and transgranular fracture, respectively, under tensile stress. Besides solid solution strengthening, the generation and annihilation behavior of dislocations at amorphous/crystalline interface and the strain hardening of the ceramic particles by hindering the movement of dislocations mutually contributes to the combination of excellent strength and ductility of our composites. © 2023, The Authors. All rights reserved.

关键词： Silica

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Preparation and Evaluation of MPEG-PCL Polymeric Nanoparticles Against Gastric Cancer

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Journal of Wuhan University of technology(materials Science) 2020年第6期35卷 1162-1168页

作者： LIU Xia LI Juncan HUANG Long YANG Jin WANG Yaowen YANG Mengjia TANG Mingxiu QIU Tong School of Chemistry Chemical Engineering and Life SciencesWuhan University of technologyWuhan 430070China China Tobacco Hubei Industrial Co. LtdWuhan 430000China College of Chemical and Environmental Engineering Hubei University for NationalitiesEnshi 445000China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Biomedical Materials and Engineering Research Center of Hubei Province Wuhan University of TechnologyWuhan 430070China

This paper provides a new treatment for gastric cancer with a new OMT delivery *** synthesized MPEG-PCL,an amphiphilic polymer,to construct a nanoparticle encapsulated OMT by pH gradient method,and then examined the nanodrug’s therapeutic *** integral analytical method was used to characterize the structure of *** single factor method and orthogonal test were utilized to investigate the optimum preparation *** morphology and average size of the OMT-NPs were analyzed by transmission electron microscopy and ***-8 assay and confocal fluorescent microscope were used to study the inhibitory effect on SGC-7901 gastric cancer *** average size of nanoparticles was 95.86±1.54 *** maximum encapsulation efficiency of OMT was 46.84±4.37%,while the drug loading content was 8.89±1.09%.The cumulative release of nanoparticles was 73.07±1.5%,inspected through dynamic dialysis in *** with free OMT,OMT-NPs showed enhanced cytotoxic effects in SGC-7901 *** nanoparticles could efficiently deliver the OMT into the cancer cells and release *** OMT delivery system prepared in this paper provides a potential platform for the treatment of gastric cancer..

关键词： MPEG-PCL nanoparticles oxymatrine gastric cancer

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Facile Fabrication of Ag Nanocrystals Encapsulated in Nitrogen-doped Fibrous Carbon as an Efficient Catalyst for Lithium Oxygen Batteries

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Energy & Environmental materials 2021年第2期4卷 239-245页

作者： Lili Liu Tianyi Ma Weiwei Fang Yuqing Liu Kostantin Konstantinov Jiazhao Wang Hua-Kun Liu School of Energy and Institute for Advanced Materials Nanjing Tech UniversityJiangsu ProvinceNanjing 211816China Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Jiangsu Provincial Key Lab for the Chemistry and Utilization of Agro-Forest BiomassCollege of Chemical EngineeringNanjing Forestry University(NFU)Nanjing 210037China State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054China Intelligent Polymer Research Institute University of WollongongWollongong NSW 2522Australia Institute for Superconducting and Electronic Materials University of WollongongWollongong NSW 2522Australia

A facile synthesis of Ag nanocrystals encapsulated in nitrogen-doped carbon fiber(NCF)is proposed,based on the simultaneous reaction between pyrrole and Ag^(+)ions in an aqueous solvent followed by a heat *** as-prepared Ag/NCF demonstrated superior catalytic behavior toward ORR and *** improved cycling stability,a much lower discharge/charge gap of 0.89 V(vs Li/Li^(+))compared with 1.38 V for NCF cathode with a fixed capacity of 500 m Ah g^(-1)was obtained in lithium oxygen *** introduction of Ag crystals into NCF facilitates the oxygen reduction reaction/oxygen evolution reaction kinetics.X-ray diffraction analysis coupled with Raman spectroscopy confirmed that Ag/NCF cathode could reversibly catalyze Li_(2)O_(2)formation and *** NCF matrix offers a conductive network to realize rapid mass transfer and the encapsulated Ag nanocrystals supplied effective catalytic active *** combined action between both contributes to the superior electrocatalytic performance.

关键词： Ag nanocrystals Li_(2)O_(2) Li–O_(2)batteries N-carbon fiber overpotential

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Phenyl propyl polysiloxane modified epoxy resin IV: flame retardancy and smoke suppression

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Polymer Degradation and Stability 2025年 240卷

作者： Wang, Changzeng Li, Shuxin Cao, Dongfeng Ji, Yundong Xu, Chengxin Wang, Dongzhi State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China Department of Materials science and Engineering University of Jinan Jinan 250022 China

The toxicity of smoke emitted from epoxy resins (EPs) and their composites in fires presents a substantial risk to human health, highlighting the continuous research efforts aimed at reducing smoke production from EP. This study utilizes phenyl propyl polysiloxane (PPPS) as a modifier to effectively decrease smoke emissions from EPs and their composites. Based on the cone calorimeter test findings, the modified epoxy resins (P/Es) exhibited a reduction of almost 60 % in total smoke emissions. Furthermore, the maximum specific optical density (Ds, max) measurements of glass fiber, carbon fiber, and Kevlar fiber reinforced P/Es in a single-chamber test all demonstrated values under the international standard requirement of 400. Examination of residual char through FTIR, SEM, and XPS techniques indicated that the presence of siloxane interfered the soot nucleation and facilitated the formation of a protective C/O/Si layer upon combustion, leading to decreased volatile emissions. The significance of the pyrolysis protective layer in influencing the thermal properties and smoke emissions of resins has been elucidated. The study suggests that silicon can efficiently capture and stabilize carbon and oxygen, providing important implications for composites research on suppressing smoke and improving post-fire strength.

关键词： Composite Epoxy Polysiloxanes Smoke suppression

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Biomimetic multi-layered protective materials with prestress and a periodic laminated structure

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Journal of Materiomics 2025年

作者： Xin Liu Fan Zhang Ji Zou Weimin Wang Wei Ji Zhengyi Fu Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration Zone Xiangyang 441138 Hubei China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

The nacreous layer of shells has become an excellent biomimetic template of materials due to its unique structure. Inspired by the highly complex multilayered structure of shells, biomimetic layered composite protective materials with outstanding strength, toughness, and impact resistance have been developed. As the hard phase in biomimetic pearlescent layered protective materials, ceramics suffer from inherent low toughness. Applying prestress proved to be an efficient method to enhance their toughness and impact resistance. In this study, prestressed biomimetic periodic laminated (TiB 2 –TiB)/Ti protective materials were fabricated with spark plasma sintering (SPS) technology under the conditions of 1450 °C and 30 MPa in an argon atmosphere. Moreover, both experimental and numerical simulation analyses were conducted to investigate their protective performance. Compared to non-prestressed protective materials, the prestressed constrained materials exhibited the significantly improved protective performance with reduced penetration depth, substantially lower residual velocity, and kinetic energy after impact. This study provided valuable insights into the structural design and performance optimization of other protective materials.

关键词： (TiB 2 -TiB)/Ti Bionic Pre-stress Protective performance Simulation modeling

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Numerical Investigation and Experimental Validation of Water Condensation in the Gas Diffusion Layer with Different Properties

SSRN

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SSRN 2022年

作者： Zhang, Heng Sarker, Mrittunjoy Rahman, Md Azimur Zhan, Zhigang Sui, Pang-Chieh Chuang, Po-Ya Abel Mechanical Engineering University of California Merced MercedCA95343 United States Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan528200 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei 430070 China School of Automotive Engineering Wuhan University of Technology Wuhan430070 China

Liquid water in the porous media hinders the transport of reactant to the catalyst layer, where the electrochemical reactions occur, which in turn, reduces performance and lifetime of a PEMFC. In this study, two different types of gas diffusion layer (GDL) materials are used to study the two-phase saturation distribution in a PEMFC. The correlations between the effective and anisotropic transport properties and porosity of the two GDLs are solved by the pore scale model. In addition, the anisotropic liquid water permeability and the relationship between saturation and capillary pressure is determined by using the Lattice-Boltzmann method. Fuel cell performance as well as liquid water distribution in the GDL using neutron radiography are obtained for validation. Under wet conditions, the cell with Freudenberg GDL performs better than that using Toray GDL, especially at high current densities. The results of the two-phase model simulation show that the peak water saturation for Toray GDL occurs in the catalyst layer and can reach 40%, while the peak water saturation for Freudenberg GDL occurs inside the GDL directly under the ribs and only reaches 25% saturation. The combined results provide key insights to enable high power operation of a PEMFC through GDL material optimization. © 2022, The Authors. All rights reserved.

关键词： Proton exchange membrane fuel cells (PEMFC)

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One-Pot Annealing Preparation of Imidazole Ring-Doped Graphitic Carbon Nitride with Enhanced Peroxidase-Like Activity for Glucose Detection

SSRN

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SSRN 2022年

作者： Gao, Xueyou Xue, Hang Zhou, Yue Chen, Yuanyuan Peng, Jian Biomedical Materials and Engineering Research Center of Hubei Province State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Department of Orthopaedics Union Hospital Tongji Medical College Huazhong University of Science andTechnology Wuhan430022 China Department of Pharmacology Medical College Wuhan University of Science and Technology Wuhan430022 China

Peroxidase-like activity of artificial enzymes has been widely used for biosensing. However, the peroxidase-like activity of artificial enzymes is far from satisfactory in contrast to natural enzymes. Herein, by imitating the structure of natural enzymes, we propose a one-pot annealing process to prepare imidazole ring-doped graphitic carbon nitride with enhanced peroxidase-like activity. By adding histidine during calcination, the graphite-phase carbon nitride doped with imidazole rings (g-C3N4-His) is obtained, which shows enhanced peroxidase-like activity by 46.5 times compared to bare g-C3N4. Furthermore, imidazole rings from g-C3N4-His make it possible to anchor Cu(II) active sites on it to produce g-C3N4-His-Cu, which show another 3 times increased peroxidase-like activity. It should be noted that the as-prepared g-C3N4-His-Cu could work in wide pH (4-9) and low temperature (5 oC). The ultrahigh peroxidase-like activity is attributed to the electronic effect of imidazole rings and active sites of Cu(II) for ·OH production. Based on the enhanced peroxidase-like activity, a H2O2 and glucose biosensor is developed with high sensitivity (limit of detection 10 nM) and selectivity. Therefore, the biosensor shows potential applications in diabetic diagnosis in clinic. © 2022, The Authors. All rights reserved.

关键词： Glucose

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Double-headed brush CsPbI 3 nanorod assemblies for high non-filtered linear polarization in optical displays

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Nano Energy 2025年 142卷

作者： Chengqi Liu Xiaoqian Wang Zisheng Tang Yanhui Jiao Dafu Zhao Manrui Liu Qi Zhang Damin Liu Zhe Pang Jiazhen He Hang Li Zhao Deng Kang Song Dongyuan Zhao Yong Liu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology Chinese Academy of Sciences Wuhan 430072 China Department of Chemistry Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative Materials State Key Laboratory of Molecular Engineering of Polymers Fudan University Shanghai 200433 China

Metal halide perovskite materials exhibit significant potential for linear polarization applications owing to their unique chemical composition, crystal structure, and exceptional optoelectronic properties. However, their intrinsic soft ionic nature, arising from dynamic lattice behavior and weak ionic bonding, presents substantial challenges in achieving precise control over assembly morphology, thereby limiting their effectiveness in linear polarization applications. Here, we report the synthesis of CsPbI 3 perovskite nanorod assemblies with a distinctive "double-headed brush" morphology via a one-step hot-injection method. This unique remote assembly structure, featuring feather-like protrusions at both ends and an enhanced moment of inertia, effectively stabilizes the horizontal orientation distribution of nanorod assemblies in solution. Consequently, the "double-headed brush" nanorod assemblies demonstrate remarkable emission anisotropy, achieving a high linear polarization degree of approximately 0.52. This study showcases precise morphological control over CsPbI 3 nanorod assemblies, leveraging the non-filtered linear polarization properties of the double-headed brush architecture, and underscores the promising potential of CsPbI 3 perovskite materials for advancing next-generation optical display.

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Anomalous Nernst Effect in an Antiperovskite Antiferromagnet

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Physical Review Applied 2022年第2期18卷 024007-024007页

作者： Yunfeng You Hei Lam Caihua Wan Chunlei Wan Wenxuan Zhu Lei Han Hua Bai Yongjian Zhou Leilei Qiao Tongjin Chen Feng Pan Junwei Liu Cheng Song Key Laboratory of Advanced Materials School of Materials Science and Engineering Tsinghua University Beijing 100084 China Department of Physics Hong Kong University of Science and Technology Hong Kong 00852 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China State Key Lab of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China

The anomalous Nernst effect (ANE), the generation of a transverse electric voltage by a longitudinal temperature gradient, has attracted increasing interest from researchers recently, due to its potential in thermoelectric power conversion and close relevance to the Berry curvature of the band structure. Avoiding the stray field of ferromagnets, the ANE in antiferromagnets (AFMs) has the advantage of realizing highly efficient and densely integrated thermopiles. Here, we report the observation of the ANE in an antiperovskite noncollinear AFM, Mn3SnN, experimentally, which is triggered by the enhanced Berry curvature from Weyl points located close to the Fermi level. Considering that antiperovskite Mn3SnN has a rich magnetic phase transition, we modulate the noncollinear AFM configurations by the biaxial strain, which enables us to control its ANE. Our findings provide a potential class of materials to explore the Weyl physics of noncollinear AFMs as well as realizing antiferromagnetic spin caloritronics that exhibits promising prospects for energy conversion and information processing.

关键词： Electronic structure Magnetic phase transitions Magnetotransport Nernst effect Spin caloritronics Thermoelectric generators Antiferromagnets Noncollinear magnets

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