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Plasma spray-physical vapor deposition toward advanced thermal barrier coatings:a review

Rare Metals 2020年第5期39卷 479-497页

作者： Mei-jun liu Gao Zhang Yan-Hong Lu Jia-Qi Han guang-Rong li Cheng-Xin li chang-jiu li guan-jun yang State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi'an 710049China

Plasma spray–physical vapor deposition(PS–PVD)is a unique technology that enables highly tailorable functional films and coatings with various rare metal elements to be *** technology bridges the gap between conventional thermal spray and vapor deposition and provides a variety of coating microstructures composed of vapor,liquid,and solid deposition *** PS–PVD technique serves a broad range of applications in the fields of thermal barrier coatings(TBCs),environmental barrier coatings(EBCs),oxygen permeable films,and electrode *** also represents the development direction of high-performance TBC/EBC preparation *** the PS–PVD technique,the composition of the deposition unit determines the microstructure of the coating and its *** coating materials are injected into a nozzle and transported into the plasma jet,the deposition unit generated by a coating material is affected by the plasma jet ***,there is no direct in situ measurement method of material transfer and deposition processes in the PS–PVD plasma jet,because of the extreme conditions of PS–PVD such as a low operating pressure of*100 Pa,temperatures of thousands of degrees,and a thin and high-velocity *** the difficulties,the transport and transformation behaviors of the deposition units were also researched by optical emission spectroscopy,observation of the coating microstructure and other *** paper reviews the progress of PS–PVD technologies considering the preparation of advanced thermal barrier coatings from the perspective of the transport and transformation behaviors of the deposition *** development prospects of new high-performance TBCs using the PS–PVD technique are also discussed.

关键词： Plasma spray–physical vapor deposition (PSPVD) Deposition unit Cross-domain behavior Deposition mechanism Thermal barrier coatings (TBCs)

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Highly stable carbon-based perovskite solar cell with a record efficiency of over 18% via hole transport engineering

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Journal of Materials Science & Technology 2019年第6期35卷 987-993页

作者： Qian-Qian Chu Bin Ding jun Peng Heping Shen Xiaolei li Yan liu Cheng-Xin li chang-jiu li guan-jun yang Thomas P. White Kylie R. Catchpole State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi'an Jiaotong University 28 West Xianning RoadXi'an 710049 China Research School of Engineering The Australian National University Canberra ACT 2601 Australia

Carbon-based perovskite solar cells show great potential owing to their low-cost production and superior stability in air, compared to their counterparts using metal contacts. The photovoltaic performance of carbon-based PSCs, however, has been progressing slowly in spite of an impressive efficiency when they were first reported. One of the major obstacles is that the hole transport materials developed for stateof-the-art Au-based PSCs are not suitable for carbon-based PSCs. Here, we develop a low-temperature,solution-processed Poly(3-hexylthiophene-2,5-diyl)(P3 HT)/graphene composite hole transport layer(HTL), that is compatible with paintable carbon-electrodes to produce state-of-the-art perovskite devices. Space-charge-limited-current measurements reveal that the as-prepared P3 HT/graphene composite exhibits outstanding charge mobility and thermal tolerance, with hole mobility increasing from8.3 × 10^-3 cm^2 V-1 s-1(as-deposited) to 1.2 × 10^-2 cm2 V^-1 s^-1(after annealing at 100°C)-two orders of magnitude larger than pure P3 HT. The improved charge transport and extraction provided by the composite HTL provides a significant efficiency improvement compared to cells with a pure P3 HT HTL. As a result, we report carbon-based solar cells with a record efficiency of 17.8%(certified by Newport);and the first perovskite cells to be certified under the stabilized testing protocol. The outstanding device stability is demonstrated by only 3% drop after storage in ambient conditions(humidity: ca. 50%) for 1680 h(nonencapsulated), and retention of ca. 89% of their original output under continuous 1-Sun illumination at room-temperature for 600 h(encapsulated) in a nitrogen environment.

关键词： Planar carbon-based perovskite solar cells Hole transport engineering Recorded efficiency Excellent moisture and light stability

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Selective Carbon Dioxide Capture in Antifouling Indole-based Microporous Organic Polymers

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Chinese Journal of Polymer Science 2020年第2期38卷 187-194,I0008页

作者： Meng-Qi Du yu-Zheng Peng yuan-Chi Ma li yang yuan-lin Zhou Fan-Kun Zeng Xiang-Ke wang Man-ling Song guan-jun chang State Key Laboratory of Environment-friendly Energy Materials School of Material Science and EngineeringSchool of Life Science and EngineeringSouthwest University of Science and TechnologyMianyang 621010China Department of Chemical and Biomolecular Engineering University of PennsylvaniaPennsylvania 19104United States

Intermolecular synergistic adsorption of indole and carbonyl groups induced by intermolecular hydrogen bonding makes microporous organic polymer(PTICBL)exhibit high CO2 uptake capacity(5.3 mmol·g^-1at 273 K)and selectivities(CO2/CH4=53,CO2/N2=107 at 273 K).In addition,we find that indole units in the PTICBL networks inhibit the attachment of bacteria(*** and ***)on the surface of PTICBL and extend its service life in CO2 capture.

关键词： CO2 capture Synergistic adsorption Antifouling Indole Microporous organic polymer

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Function toggle of tumor microenvironment responsive nanoagent for highly efficient free radical stress enhanced chemodynamic therapy

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Nano Research 2022年第9期15卷 8228-8236页

作者： Xueting yang Shuaitian Guo li wang Shanyue guan Shuyun Zhou jun Lu State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100190China Beijing Advanced Innovation Center for Soft Mater Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China

In contrast to reactive oxygen species(ROS),the generation of oxygen-irrelevant free radicals is oxygen-and H2O2-independent in cell,which can offer novel opportunities to maximum the chemodynamic therapy(CDT)***,an H2O2-independent“functional reversion”strategy based on tumor microenvironment(TME)-toggled C-free radical generation for CDT is developed by confining astaxanthin(ATX)on the NiFe-layered double hydroxide(LDH)nanosheets(denoted as ATX/LDH).The unique ATX/LDH can demonstrate outstanding TME-responsive C-free radical generation performance by proton coupled electron transfer(PCET),owing to the specific ATX activation by unsaturated Fe sites on the LDH nanosheets formed under ***,the Brönsted base sites of LDH hydroxide layers can promote the generation of neutral ATX C-free radicals by capturing the protons generated in the ATX activation ***,ATX/LDH maintain antioxidant performance to prevent normal tissue cancerization due to the synergy of LDH nanosheets and antioxidative *** addition,C-free radical can compromise the antioxidant defense in cells to the maximum extent,compared with *** free radicals burst under TME can significantly elevate free radical stress and induce cancer cell *** strategy can realize TME-toggled C free radical generation and perform free radical stress enhanced CDT.

关键词： ultrathin layered double hydroxide nanosheets astaxanthin free radical chemodynamic therapy

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miR-205 is frequently downregulated in prostate cancer and acts as a tumor suppressor by inhibiting tumor growth

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Asian Journal of Andrology 2013年第6期15卷 735-741,I0005页

作者： Ning wang Qi li Ning-Han Feng Gong Cheng Zhao-Long guan yang wang Chao Qin chang-jun Yin li-Xin Hua Department of Urology First Affiliated Hospital of Nanjing Medical University Nanjing 210029 China

The purpose of this study was to elucidate the molecular mechanisms of microRNA-205 （miR-205） as a tumor suppressor in prostate cancer （PCa）o In the present study, microRNA microarray analysis suggested that the expression of miR-205 was significantly decreased in advanced PCa compared with early PCa. Real-time PCR analysis also indicated that miR-205 expression was significantly decreased in PCa tissues compared with non-cancerous tissues. Moreover, the expression of miR-205 has been demonstrated to be associated with the clinicopathological stage and total/free prostate-specific antigen （PSA） level of PCa. Functional analyses showed that both the overexpression of miR-205 and the knockdown of c-SRC in PCa cell lines could inhibit cell growth, colony formation, migration, invasion and the cell cycle as well as induce cell apoptosis in vitro. Furthermore, over-expressing miR-205 reduced tumorigenicity in vivo. Through a luciferase activity assay and Western blotting, c-SRCwas identified as a target of miR-205 in cells. The overexpression of miR-205 suppressed c-SRC and its downstream signaling molecules, including FAK, p-FAK, ERK1/2 and D-ERK1/2, and attenuated cell proliferation, invasion and tumor growth.

关键词： c-SRC miR-205 prostate cancer (PCa) tumor growth

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Insight into role of Ni/Fe existing forms in reversible oxygen catalysis based on Ni-Fe single-atom/nanoparticles and N-doped carbon

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Rare Metals 2022年第12期41卷 4034-4040页

作者： Hong-yu Gong Xiu liang guan-liang Sun Dong-Wei li Xiang-jun Zheng Huan Shi Kai Zeng guan-Chen Xu Yong li Rui-Zhi yang chang-Zhou yuan Advanced Materials Institute Qilu University of Technology(Shandong Academy of Sciences)Jinan 250014China Shandong Saikesaisi Hydrogen Energy Co. LtdJinan 250100China School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China School of Materials Science&Engineering University of JinanJinan 250014China College of Energy Soochow Institute for Energy and Materials InnovationsSoochow UniversitySuzhou 215006China

Oxygen catalysis reactions play essential roles in metal-air batteries,fuel cells,water electrolysis and artificial photosynthesis,with their development receiving significant attention in recent *** the structure-activity relationship plays an important role in the construction and performance optimization of reversible oxygen catalyst.

关键词： catalyst catalysis reversible

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Extracellular vesicles from hypoxia-preconditioned mesenchymal stem cells alleviates myocardial injury by targeting thioredoxininteracting protein-mediated hypoxia-inducible factor-1αpathway

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World Journal of Stem Cells 2022年第2期14卷 183-199页

作者： Cheng-yu Mao Tian-Tian Zhang Dong-jiu li En Zhou yu-Qi Fan Qing He chang-Qian wang jun-Feng Zhang Department of Cardiology Shanghai Ninth People’s Hospital affiliated to Shanghai Jiao Tong University School of MedicineShanghai 200010China

BACKGROUND Extracellular vesicles(EVs)derived from hypoxia-preconditioned(HP)mesenchymal stem cells(MSCs)have better cardioprotective effects against myocardial infarction(MI)in the early stage than EVs isolated from normoxic(NC)-***,the cardioprotective mechanisms of HP-EVs are not fully *** To explore the cardioprotective mechanism of EVs derived from HP *** We evaluated the cardioprotective effects of HP-EVs or NC-EVs from mouse adipose-derived MSCs(ADSCs)following hypoxia in vitro or MI in vivo,in order to improve the survival of cardiomyocytes(CMs)and restore cardiac *** degree of CM apoptosis in each group was assessed by the terminal deoxynucleotidyl transferase dUTP nick end-labeling and Annexin V/PI ***(miRNA)sequencing was used to investigate the functional RNA diversity between HP-EVs and NC-EVs from mouse *** molecular mechanism of EVs in mediating thioredoxin-interacting protein(TXNIP)was verified by the dual-luciferase reporter ***-immunoprecipitation,western blotting,and immunofluorescence were performed to determine if TXNIP is involved in hypoxia-inducible factor-1 alpha(HIF-1α)ubiquitination and degradation via the chromosomal region maintenance-1(CRM-1)-dependent nuclear transport *** HP-EVs derived from MSCs reduced both infarct size(necrosis area)and apoptotic degree to a greater extent than NC-EVs from CMs subjected to hypoxia in vitro and mice with MI in *** of EV-associated miRNAs showed the upregulation of 10 miRNAs predicted to bind TXNIP,an oxidative stress-associated *** showed miRNA224-5p,the most upregulated miRNA in HP-EVs,directly combined the 3’untranslated region of TXNIP and demonstrated its critical protective role against hypoxia-mediated CM *** results demonstrated that MI triggered TXNIP-mediated HIF-1αubiquitination and degradation in the CRM-1-mediated nuclear transport pathway in CMs,which led to aggravated injury and hypoxia t

关键词： Extracellular vesicles Myocardial infarction Mesenchymal stem cells Hypoxia preconditioning Thioredoxin-interacting protein Hypoxia-inducible factor 1 alpha

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Bimodal TBCs with low thermal conductivity deposited by a powder-suspension co-spray process

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Journal of Materials Science & Technology 2018年第8期34卷 1293-1304页

作者： Wei-Wei Zhang guang-Rong li Qiang Zhang guan-jun yang Guo-wang Zhang Hong-Min Mu State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi'an Jiaotong UniversityXi'an 710049China School of Materials Science and Engineering Chang'an UniversityXi'an 710064China Institute of Publication Science Chang'an UniversityXi'an 710064China AECC Beijing Institute of Aeronautical Material Beijing 100095China

Advanced thermal harrier coatings （TBCs） with better thermal barrier performance are required by both advanced gas turbine and air engine. In this work, novel bimodal TBCs with low thermal conductivity were deposited and characterized by a novel co-spray approach with both solid powder and suspension. Experimental and finite element analyses were used to optimize the process parameters to prepare the specific morphology nanostructure features. With a comprehensive understanding on the influence of spraying parameters on the morphology ofnano-particles, homogeneous nano-particle heaps with a large aspect ratio were introduced to conventional layered coatings by plasma co-spraying with suspension and solid powder. Co-sprayed bimodal microstructure composite coatings resulted from both wet suspension droplets and molten particle droplets exhibited low thermal conductivity. The thermal conductivity of the composite coating was 1/5 lower than that of the counterpart coatings by conventional plasma spraying with solid powder. This study sheds light to the structural tailoring towards the advanced TBCs with low thermal conductivity.

关键词： Thermal barrier coatings Aspect ratioBimodal microstructure Thermal conductivity Co-spray process

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Micro-patterned hydroxyapatite/silk fibroin coatings on Mg-Zn-Y-Nd-Zr alloys for better corrosion resistance and cell behavior guidance

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Frontiers of Materials Science 2020年第4期14卷 413-425页

作者： Lei chang Xiangrui li Xuhui TANG He ZHANG Ding HE yujun wang Jiayin ZHAO Jingan li jun wang Shijie ZHU liguo wang Shaokang guan School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China Henan Key Laboratory of Advanced Magnesium Alloy Zhengzhou 450001China Key Laboratory of Materials Processing and Mold Technology(Ministry of Education) Zhengzhou UniversityZhengzhou 450001China

In this study,a micro-patterned hydroxyapatite/silk fibroin(HA-SF)coating was firstly fabricated on the surface of Mg-Zn-Y-Nd-Zr alloy by template-assisted electrospraying technique coupling with spin coating *** types of micro-patterns were achieved with high contour accuracy,namely HA SF(line-pattern)and HA-SF(dot-pattern).The microstructure,composition,surface wettability and corrosion behaviors of the coatings were investigated by SEM,EDS,FTIR,XRD,water contact angle and potentiodynamic polarization *** results revealed the hydrophilic nature of coatings and two orders of magnitude reduction of corrosion density(icorr)as compared with that of the *** the micro-patterned surfaces promoted the attachment of MC3T3-E1 cells with visible filopodia after 1 d *** addition,coatings with line pattern exhibited the superior guidance to cell migration as compared to dot pattern,and the preference of cell attachment in the convex zone was *** summary,the obtained micro-patterned HA-SF coatings possessed the remarkably improvement of anticorrosion ability and good efficacy in guidance of cell attachment and alignment,which can serve as a promising strategy for cellular response modulation at the interface of magnesium-based implants and bone.

关键词： magnesium alloy silk fibroin hydroxyapatite micro-patterned surface electrospraying technique

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Hydrogeochemical and isotopic characteristics of spring water in the Yarlung Zangbo River Basin, Qinghai-Tibet Plateau, Southwest China

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Journal of Mountain Science 2021年第8期18卷 2061-2078页

作者： li Ying-zhi GAO Zong-jun liU jiu-tan wang Min HAN Cong School of Environmental Science and Engineering Chang’an UniversityXi’an710054China Center for Hydrogeology and Environmental Geology Survey China Geological SurveyBaoding071051China College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao266590China College of Energy and Mining Engineering Shandong University of Science and TechnologyQingdao266590China

The Yarlung Zangbo River Basin(YZRB)is situated in the southern part of the Tibetan Plateau and remains in a mostly natural *** understand the chemical characteristics of spring water and its controlling factors in the YZRB,68 sets of spring water samples were analyzed using hydrochemical and isotopic *** spring water was found to be slightly alkaline with total dissolved solids(TDS)below 1000 mg L−*** ions were Mg2+,Ca2+,SO42−,and HCO3−.The spring water types in this basin were determined to be HCO3-Ca·Mg and SO4·Cl-Ca·*** exchange and dissolution of carbonate,gypsum,and silicate were identified as the prevalent hydrogeochemical processes contributing and defining spring water chemistry in this *** indices(SI)of most major minerals studied in this region were below zero,indicating that these minerals remain under-saturated in the spring water in this ***,the rank of different processes in terms of their contribution to the chemical composition of spring water in the YZRB was carbonate weathering>evaporate dissolution>silicate weathering>precipitation *** content of 18O in spring water ranged from−22.22‰to−14.08‰with a mean of−18.15‰.Samples collected below and close to the local and global meteoric water lines indicated that spring water in this area is derived from meteoric water with chemistry affected by evaporation.

关键词： Hydrochemistry Stable isotopes Spring water Controlling factors The Yarlung Zangbo River Basin

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