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Surface photodynamic ion sterilization of ITO-Cu_(2)O/ZnO preventing touch infection

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Journal of Materials Science & Technology 2022年第27期122卷 10-19页

作者： Zexin liu xiangmei liu Zhenduo Cui Yufeng Zheng Zhaoyang Li Yanqin Liang Xubo Yuan Shengli Zhu Shuilin Wu School of Materials Science&Engineering the Key Laboratory of Advanced Ceramics and Machining Technology by the Ministry of Education of ChinaTianjin UniversityTianjin 300072China School of Life Science and Health Engineering Hebei University of TechnologyTianjin 300401China School of Materials Science&Engineering Peking UniversityBeijing 100871China

Pathogenic microbial infections are threatening the people’s health and even *** most common channel of infections can be caused by skin contact,especially hand touching facilities such as touching *** this work,Cu_(2)O covered with ZnO nanofilm was prepared on the surface of indium tin oxide conductive glass by electrodeposition and the followed atomic layer deposition *** composite coating had a light transmittance of 71.5%,which met the light transmission needs of touch screen *** spin resonance spectra showed that composite materials can generate more reactive oxygen species(ROS)than a single component under solar light *** was because a p-n junction with a built-in electric field was formed at the interface after Cu_(2)O contacting with *** the process of photocatalysis,photogenerated electrons and holes migrated at the interface driven by the built-in electric field,which promoted the separation of *** antibacterial rate against Staphylococcus aureus reached 92.5%after 3 min of light irradiation with simulated sunlight due to the synergy of ROS and Cu ions,Zn ***,this work may provide a potential method for antibacterial application of preventing hand touch infections.

关键词： Antibacterial Cu_(2)O ZnO Contact infection Photodynamic ion sterilization

The effects of dilution gas on nanoparticle growth in atmospheric-pressure acetylene microdischarges

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Plasma Science and Technology 2022年第8期24卷 105-112页

作者： xiangmei liu Xiaotian DONG Hongying LI Shuxia ZHAO School of Science Qiqihar UniversityQiqihar 161006People's Republic of China School of Physics Dalian University of TechnologyDalian 116024People's Republic of China

A two-dimensional multi-fluid model is developed to investigate the effects of dilution gas on microplasma properties and nanoparticle behavior in atmospheric-pressure radio-frequency acetylene *** percentage of dilution gases(argon and helium)percentage varied from 0%to 90%,with the pressure kept *** results show that the dilution gas percentage has a significant influence on the spatial distributions of the electron density and temperature,as well as on the formation of nanoparticles in acetylene *** increasing dilution gas percentage,the electron density profile changes continuously from being high at the edge to high in the center.A mode transition from a mixed discharge mode with bothαregime and drift-ambipolar regime intoαregime occurs,which is associated with a sudden decrease in the electron density of the presheaths and an increase in the electron temperature of the bulk *** mode transition point corresponds to the lowest number density ratio of hydrocarbon ions to *** highest number density ratio is observed at a dilution percentage of 90%,and causes more effective nucleation and coagulation of ***,owing to the high ionization potential of helium,the transition point moves to a larger dilution gas percentage in C_(2)H_(2)/He ***,the growth of nanoparticles via coagulation is studied.

关键词： dusty plasmas acetylene microdischarges dilution gas effects mode transition

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A facile fabrication of novel stuff with antibacterial property and osteogenic promotion utilizing red phosphorus and near-infrared light

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Bioactive Materials 2019年第1期4卷 17-21页

作者： Bo Huang Lei Tan xiangmei liu Jun Li Shuilin Wu Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei Key Laboratory of Polymer MaterialsSchool of Materials Science&EngineeringHubei UniversityWuhan430062China School of Materials Science&Engineering The Key Laboratory of Advanced Ceramics and Machining Technology by the Ministry of Education of ChinaTianjin UniversityTianjin300072China

Bone-implant materials are important for bone repairing and orthopedics surgery,which include bone plates and bone *** materials need to be designed not only considering its biostability and biocompatibility,but also their by-products induced infection after therapy or long-time treatment in ***,the development of novel implant materials is quite *** phosphorus has great biocompatibility and exhibits efficient photothermal ***,a red phosphorus/IR780/arginine-glycine-asparticacid-cysteine(RGDC)coating on titanium bone-implant was *** temperature sensitivity of Staphylococcus aureus biofilm is enhanced in the presence of ROS produced by IR780 with 808 nm light *** keeping the cells and tissues normal,a high antibacterial performance can be realized by near-infrared(808 nm)irradiated within 10 min at 50℃.Besides the high effective antibacterial efficacy provided by photothermal therapy(PTT)and photodynamic therapy(PDT),the RGDC decorated surface can also possess an excellent performance in osteogenesis in vivo.

关键词： Implants Red phosphorus Near-infrared Osteogenesis Antibacterial Biofilm

Simulation of mode transitions in capacitively coupled Ar/O_(2) plasmas

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Plasma Science and Technology 2024年第11期26卷 96-106页

作者： xiangmei liu Shuren ZHANG Shuxia ZHAO Hongying LI Xiaohui REN School of Science Qiqihar UniversityQiqihar 161006People’s Republic of China School of Physics Dalian University of TechnologyDalian 116024People’s Republic of China

In this work,the effects of the frequency,pressure,gas composition,and secondary-electron emission coefficient on the discharge mode in capacitively coupled Ar/O_(2) plasmas were carefully studied through *** discharge modes,i.e.,α,γ,and drift-ambipolar(DA),were considered in this *** results show that a mode transition from theγ-DA hybrid mode dominated by theγmode to the DA-αhybrid mode dominated by the DA mode is induced by increasing the frequency from 100 k Hz to 40 ***,the electron temperature decreases with increasing frequency,while the plasma density first decreases and then *** was found that the electronegativity increases slightly with increasing pressure in the lowfrequency region,and it increases notably with increasing pressure in the high-frequency *** was also observed that the frequency corresponding to the mode transition fromγto DA decreased when the secondary-electron emission coefficient was ***,it was found that increasing the oxygen content weakens theγmode and enhances the DA *** importantly,the density of oxygen atoms and ozone will increase greatly with increasing oxygen content,which is of great significance for industrial applications.

关键词： mode transition processing parameters Ar/O_(2)discharges

Inflammation and Microbiota Regulation Potentiate Pneumonia Therapy by Biomimetic Bacteria and Macrophage Membrane Nanosystem

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Research 2023年第4期2023卷 399-413页

作者： Yuan Li xiangmei liu Zhenduo Cui Yufeng Zheng Hui Jiang Yu Zhang Zhaoyang Li Shengli Zhu Paul K Chu Shuilin Wu School of Materials Science and Engineering Peking UniversityBeijing 100871China The Key Laboratory of Advanced Ceramics and Machining Technology by the Ministry of Education of China School of Materials Science and EngineeringTianjin UniversityTianjin 300072China Biomedical Materials Engineering Research Center Hubei Key Laboratory of Polymer MaterialsMinistry-of-Education Key Laboratory for the Green Preparation and Application of Functional MaterialsSchool of Materials Science and EngineeringHubei UniversityWuhan430062China School of Health Science and Biomedical Engineering Hebei University of TechnologyXiping Avenue 5340Beichen DistrictTianjin 300401China Department of Orthopedics Guangdong Provincial People’s HospitalGuangdong Academy of Medical SciencesGuangzhou510080China Department of Physics Department of Materials Science and Engineeringand Department of Biomedical EngineeringCity University of Hong KongKowloon 999077Hong KongChina.

While conventional nanosystems can target infected lung tissue,they cannot achieve precise cellular targeting and enhanced therapy by modulating inflammation and microbiota for effective ***,we designed a nucleus-targeted nanosystem with adenosine triphosphate(ATP)and reactive oxygen species stimuli-response to treat pneumonia coinfected with bacteria and virus that is enhanced through inflammation and microbiota *** nucleus-targeted biomimetic nanosystem was prepared through the combined bacteria-macrophage membrane and loaded hypericin and ATP-responsive dibenzyl oxalate(MMHP)*** MMHP despoiled the Mg^(2+)of intracellular cytoplasm in bacteria to achieve an effective bactericidal ***,MMHP can target the cell nucleus and inhibit the H1N1 virus duplication by inhibiting the activity of *** possessed an immunomodulatory ability to reduce the inflammatory response and activate CD8^(+)T cells for assisted infection *** the mice model,the MMHP effectively treated pneumonia coinfected with Staphylococcus aureus and H1N1 ***,MMHP mediated the composition of gut microbiota to enhance the pneumonia ***,the dual stimuli-responsive MMHP possessed promising clinical translational potential to therapy infectious pneumonia.

关键词： inflammation H1N1 lung

Dual elemental doping activated signaling pathway of angiogenesis and defective heterojunction engineering for effective therapy of MRSA-infected wounds

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Bioactive Materials 2024年第7期37卷 14-29页

作者： Jin Huang Shuilin Wu Yi Wang Jie Shen Chaofeng Wang Yufeng Zheng Paul K.Chu xiangmei liu Biomedical Materials Engineering Research Center Hubei Key Laboratory of Polymer MaterialsMinistry-of-Education Key Laboratory for the Green Preparation and Application of Functional MaterialsSchool of Materials Science&EngineeringHubei UniversityWuhan430062China Shenzhen Key Laboratory of Spine Surgery Department of Spine SurgeryPeking University Shenzhen HospitalShenzhen518036China School of Health Science&Biomedical Engineering Hebei University of TechnologyTianjin300401China School of Materials Science&Engineering Peking UniversityBeijing100871China Department of Physics and Department of Materials Science and Engineering City University of Hong Kong999077China

Multi-drug resistant bacterial infections pose a significant threat to human ***,the development of effective bactericidal strategies is a pressing *** this study,a ternary heterostructure(Zn-CN/P-GO/BiS)comprised of Zn-doped graphite phase carbon nitride(g-C3N4),phosphorous-doped graphene oxide(GO)and bismuth sulphide(Bi_(2)S_(3))is constructed for efficiently treating methicillin-resistant Staphylococcus aureus(MRSA)-infected *** doping-induced defect sites in g-C_(3)N_(4) results in a reduced band gap(ΔE)and a smaller energy gap(ΔEST)between the singlet state S_(1) and triplet state T_(1),which favours two-photon excitation and accelerates electron ***,the formation of an internal electric field at the ternary heterogeneous interface optimizes the charge transfer pathway,inhibits the recombination of electron-hole pairs,improves the photodynamic effect of g-C3N4,and enhances its catalytic ***,the Zn-CN/P-GO/BiS significantly augments the production of reactive oxygen species and heat under 808 nm NIR(0.67 W cm^(-2))irradiation,leading to the elimination of 99.60%±0.07%MRSA within 20 ***,the release of essential trace elements(Zn and P)promotes wound healing by activating hypoxia-inducible factor-1(HIF-1)and peroxisome proliferator-activated receptors(PPAR)signaling *** work provides unique insight into the rapid antibacterial applications of trace element doping and two-photon excitation.

关键词： Methicillin-resistant Staphylococcus aureus Defective heterojunction engineering Wound healing Phototherapy Signaling pathways

Effect of metal centres and substituents on the structure and optoelectronic properties of diarylethene compounds:A theoretical study

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Science China Chemistry 2013年第1期56卷 137-147页

作者： liu ShuJuan YANG ChengJiang XU WenJuan HUANG YanQin YE ShangHui ZHAO Qiang liu xiangmei HUANG Wei Key Laboratory for Organic Electronics & Information Displays (KLOEID) and Institute of Advanced Materials (IAM) Nanjing University of Posts & Telecommunications (NUPT) State Key Laboratory of Coordination Chemistry Nanjing University

Diarylethene derivatives are a class of fascinating photochromic materials because of their open and closed isomers with different absorption spectra and many other *** reveal the detailed structure and optoelectronic properties as well as the effect of metal centres and substituents on them,a systematic study on a series of diarylethene derivatives and their Re(I),Pt(II),and Ir(III) complexes was performed via theoretical *** optimized geometries,electronic properties,frontier molecular orbitals,ionization potentials,electron affinities,reorganization energies,and absorption spectra for both of their open-and closed-isomers have been calculated and ***-coordination and substituents exhibit great influence on the photophysical,charge-injection and-transporting *** addition,the binding of F-with the boron atom of dimesitylboryl group through Lewis acid/base interactions also induces great changes of structural,photophysical and electronic properties for these diarylethene derivatives,and consequently the compound with the substituent of dimesitylboryl group can be used as selective near-infrared phosphorescent F-probe.

关键词： complexes density functional theory diarylethene phosphorescence optoelectronic properties

Rapid and highly effective bacteria-killing by polydopamine/IR780@MnO2–Ti using near-infrared light

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Progress in Natural Science:Materials International 2020年第5期30卷 677-685页

作者： Xingfu Teng xiangmei liu Zhenduo Cui Yufeng Zheng Da-fu Chen Zhaoyang Li Yanqin Liang Shengli Zhu Shuilin Wu Hubei Key Laboratory of Polymer Materials Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials School of Materials Science & Engineering Hubei University The Key Laboratory of Advanced Ceramics and Machining Technology by the Ministry of Education of China School of Materials Science & Engineering Tianjin University State Key Laboratory for Turbulence and Complex System and Department of Materials Science and Engineering College of Engineering Peking University Beijing JiShuiTan Hospital Beijing Research Institute Orthopaedics & TraumatologyLab Bone Tissue Engineering

Bacterial infections are becoming a serious public health challenge because the abuse of antibiotics worldwide has caused bacterial resistance and the occurrence of superbugs. In this work, a new near-infrared(NIR) photoresponsive coating was constructed on Ti implant material, which was composed of Mn O2, IR780 photosensitizer and polydopamine(PDA). Under the irradiation of 808 nm NIR light, the component of Mn O2in the coating exhibited high photothermal performance, and IR780 could be stimulated to generate ROS as a photosensitizer. The addition of PDA not only improved the cytocompatibility of the composite coating but also strengthened the light absorption ability of the system. Under the irradiation of 808 nm NIR light for 15 min, the composite coating killed 99.94% Staphylococcus aureus and 99.89% Escherichia coli on Ti plates. This rapid and highly effective bactericidal rate was ascribed to the synergistic effects of photothermal performance and photodynamic effect of the coatings excited by NIR light. Cell culture tests showed that PDA/IR780@Mn O2–Ti had good cytocompatibility due to the excellent biocompatibility of PDA and nanostructured surface. Therefore,this surface system will be a very promising plateform to safely and effectively kill bacteria on biomedical devices and implants in a short time.

关键词： Antibacterial Photothermal Photocatalytic MnO2 Implant

Controlled release and biocompatibility of polymer/titania nanotube array system on titanium implants

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Bioactive Materials 2017年第1期2卷 44-50页

作者： Tingting Wang Zhengyang Weng xiangmei liu Kelvin W.K.Yeung Haobo Pan Shuilin Wu Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional MaterialsHubei Key Laboratory of Polymer MaterialsSchool of Materials Science&EngineeringHubei UniversityWuhanChina Division of Spine Surgery Department of Orthopaedics&TraumatologyLi Ka Shing Faculty of MedicineThe University of Hong KongPokfulamHong KongChina Center for Human Tissues and Organs Degeneration Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen518055China

Bacterial infection and tissue inflammation are the major causes of early failure of titanium-based orthopedic implants;thus,surgical implants with tunable drug releasing properties represent an appealing way to address some of these problems of bacterial infection and tissue inflammation in early age of orthopedic *** this work,a hybrid surface system composed of biodegradable poly(lactic-coglycolic acid)(PLGA)and titania nanotubes(TNTs)has been successfully constructed on Ti implants with the aim of preventing bacterial infection via long-term drug *** varying the size of the TNTs and the thickness of the polymer film,the drug release profile can be tuned to achieve the optimal therapeutic action throughout the treatment *** size of TNTs plays a dominant role in the drug loading dose of TNTs/PLGA hybrid *** this work,TNTs with an average size of 80 nm can achieve the largest loading *** on the polymer thickness,significant improvement in the drug release characteristics is attained,for instance,reduced burst release(from 84%to 27%)and overall release time extended from 5 to over 40 *** addition,the PLGA layers may favor the proliferation and osteogenesis of MC3T3-E1 mouse cells at an earlier ***,this TNT/PLGA hybrid surface system can be employed as an effective bioplatform for improving both self-antibacterial performance and biocompatibility of Ti-based biomaterials.

关键词： Antibacterial Biocompatibility Coating Drug delivery Implants