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Ternary phase diagram of all-inorganic perovskite CsPbCl_(a)Br_(b)I_(3−a−b)nanocrystals

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Nano Research 2022年第8期15卷 7590-7596页

作者： Xin Lv Gaoyu Chen Xia Zhu Jiakun An Jianchun Bao xiangxing xu Jiangsu Key Laboratory of Biofunctional Materials Jiangsu Key Laboratory of New Power BatteriesSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210046China

All-inorganic lead halide perovskite CsPbX3(X=Cl,Br,and I)nanocrystals(NCs)have shown great application prospects in optoelectronic fields.Their properties can be feasibly tuned by the ratio of different halide ions.Post-synthesis halide anion exchange of Cl‒Br or Br‒I in CsPbX3 NCs allows getting any desired composition of CsPbClxBr3−x and CsPbBr_(x)I_(3−x)(0≤x≤3).However,due to the large difference of the Cl and I radii,they can only substitute each other in a limited ratio to form CsPbCl_(y)I_(3−y)(0

关键词： all-inorganic perovskite nanocrystals anion exchange ternary phase diagram

General Preparation and Shaping of Multifunctional Nanowire Aerogels for Pressure/Gas/Photo‑Sensing

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Advanced Fiber Materials 2022年第1期4卷 66-75页

作者： Xiaoyu Liu Gaoyu Chen Jianchun Bao xiangxing xu Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Center of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210046People’s Republic of China

Nanowires(NWs)with ultrahigh aspect ratio are good one-dimensional(1D)nano scafolds for building functional aerogels.However,challenges still remain in exploring methods to prepare shape designable NW aerogels with high quality,and to reveal multi functions in a single NW aerogel monolith.Here,we report a general camphene freeze-drying method for preparation of various inorganic NW aerogels(e.g,Cu,hydroxylapatite,MnO_(2)and MnOOH NW aerogels),2D graphene oxide nanosheet aerogels,organic polymer aerogels of polystyrene(post-synthesis)and resin(in situ polymerization)aerogels,which can be freely shaped in the frozen monolith stage.The as prepared aerogels have even distributed porosity and smooth surface.Also camphene is cheap and can be efectively recycling collected for reuse.For the Cu NW aerogel with even porosity and low density of 20 mg cm^(−3),multifunctional pressure/gas/photo-sensing was demonstrated.A high pressure sensitivity of 1.7 kPa^(−1)was achieved.

关键词： Nanowires Aerogel Camphene Multifunction Sensing

Ligand-controlled synthesis of high density and ultra-small Ru nanoparticles with excellent electrocatalytic hydrogen evolution performance

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Nano Research 2022年第2期15卷 1269-1275页

作者： Zhiwen Che xuyun Lu Bingfeng Cai xiangxing xu Jianchun Bao Ying Liu School of Chemistry and Materials Science Nanjing Normal UniversityNanjing 210023China

Ultra-small size metal nanoparticles(u-MNPs)have broad applications in the fields of catalysis,biomedicine and energy conversion.Herein,by means of a ligand-controlled synthesis strategy,series of Ru-based NPs with high dispersity and ultra-small size(marked as u-Ru/C),or sparse and aggregated state(marked as a-Ru/C)anchored on the surface of hollow porous carbon shells are prepared.Systematical in-situ thermogravimetry-mass spectrometry-Fourier transform infrared spectra tests suggest that the different ligands in these Ru-based precursors can regulate the nucleation,growth and fixation of metal sites during the pyrolysis process,thus contributing to Ru NPs with various size and dispersity.As a result,when applied to hydrogen evolution reaction,the u-Ru-1/C catalyst displays a low Tafel slope of 26 mV dec-1,overpotential of 31 mV(at 10 mA cm^(-2))and a large exchange current density of 1.7 mA cm^(-2) in 1.0 M KOH,significantly better than that of the a-Ru-2/C,hollow carbon and even commercial 20%Pt/C.This is mainly because that the u-Ru-1/C sample owns both smaller particle size,more electrochemical active sites,higher intrinsic activity and optimized surface H adsorption ability than that of the a-Ru-2/C counterpart.Such ligand-modulated growth strategy is not only applicable to Ru,but also can be extended to other similar metals,offering a step forward in the design and synthesis of highly dispersed u-MNPs.

关键词： ultra-small Ru nanoparticles ligand in-situ test formation mechanism hydrogen evolution reaction

Reduction of the oxidative damage to H_(2)O_(2)-induced HepG2 cells via the Nrf2 signalling pathway by plant flavonoids Quercetin and Hyperoside

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Food Science and Human Wellness 2024年第4期13卷 1864-1876页

作者： Meijing Zhang Gaoshuai Zhang xiangxing Meng Xinxin Wang Jiao Xie Shaoshu Wang Biao Wang Jilite Wang Suwen Liu Qun Huang xu Yang Jing Li Hao Wang State Key Laboratory of Food Nutrition and Safety Tianjin University of Science and Technology(TUST)Tianjin 300457China Key Laboratory of Environmental Pollution Monitoring and Disease Control Ministry of EducationGuizhou Medical UniversityGuiyang 550025China College of Chemical Engineering and Materials Science Tianjin University of Science and Technology(TUST)Tianjin 300457China Department of Agriculture Hetao CollegeBayannur 015000China College of Food Science&Technology Hebei Normal University of Science and TechnologyQinhuangdao 066004China National Center of Supervision and Inspection for Processed Food Quality Tianjin Institute for Food Safety Inspection TechnologyTianjin 300457China

Hyperoside and quercetin are similar in molecular structures.In this study,the antioxidant regulatory targets of hyperoside and quercetin are mainly in the nuclear factor(erythroid-2-derived)-related factor 2(Nrf2)pathway predicted by network pharmacology.And the antioxidant effect and mechanism of hyperoside and quercetin were measured and compared in H_(2)O_(2)-induced Hep G2 cells and Caenorhabditis elegans.The findings indicated that quercetin was more effective than hyperoside in reducing oxidative damage,which was proved by improved cell viability,decreased reactive oxygen species(ROS)production,decreased cellular apoptosis,and alleviated mitochondrial damage.In addition,quercetin was more efficient than hyperoside in enhancing the expression of Nrf2-associated m RNAs,increasing the activities of superoxide dismutase(SOD),glutathione peroxidase(GSH-Px),and catalase(CAT),and reducing the cellular malondialdehyde(MDA)content.Quercetin was superior to hyperoside in prolonging the lifespan of worms,decreasing the accumulation of lipofuscin,inhibiting ROS production,and increasing the proportion of skn-1 in the nucleus.With the Nrf2 inhibitor ML385,we verified that quercetin and hyperoside primarily protected the cells against oxidative damage via the Nrf2 signalling pathway.Furthermore,molecular docking and dynamics simulations demonstrated that the quercetin-Kelch-like ECH-associated protein 1(Keap1)complex was more stable than the hyperoside-Keap1 complex.The stable structure of the complex might hinder the binding of Nrf2 and Keap1 to release Nrf2 and facilitate its entry into the nucleus to play an antioxidant role.Overall,quercetin had a better antioxidant than hyperoside.

关键词： Hyperoside Quercetin HepG2 cell Oxidative damage Nrf2 signalling pathway

Fine Tuning of the Sizes and Phases of ZrO_(2)Nanocrystals

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Nano Research 2009年第11期2卷 891-902页

作者： xiangxing xu xun Wang Department of Chemistry Tsinghua UniversityBeijing 100084China

Monodisperse and pure phase zirconia(tetragonal:T-ZrO_(2);monoclinic:M-ZrO_(2))nanocrystals with finely tuned sizes as well as ultrathin T-ZrO_(2)nanowires have been selectively synthesized by a facile solvothermal method.For the first time,a diagram of the size to effective strain was mapped for both T-ZrO_(2)and M-ZrO_(2),which gives a good explanation for the size-and cation doping-dependent stability of the two phases on the sub-10nm scale.This work may expand our understanding of the phase properties of not only zirconia,but also various other polymorphic nanocrystals.

关键词： Nanocrystals polymorphism phase stability

PbS quantum dots as a saturable absorber for ultrafast laser

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Photonics Research 2018年第11期6卷 1028-1032页

作者： LING YUN YANG QIU CONGHAO YANG JIE XING KEHAN YU xiangxing xu WEI WEI College of Electronic and Optical Engineering & College of Microelectronics Nanjing University of Posts and Telecommunications Jiangsu Key Laboratory of Biofunctional Materials School of Chemistry and Materials Science Nanjing Normal University

Low-dimensional nanomaterials, owing to their unique and versatile properties, are very attractive for enormous electronic and optoelectronic applications. PbS quantum dots(QDs), characterized by a large Bohr radius and size-tunable bandgap, are especially interesting for photonic applications in the near-infrared region. Here, oleic acid capped colloidal PbS QDs as a saturable absorber are investigated for ultrashort-pulse generation. The PbS QDs exhibit outstanding nonlinear saturable absorption properties at 1550 nm: a modulation depth up to 44.5%and a thermal damage threshold larger than 30 mJ∕cm^2. By incorporating PbS QDs into a fiber laser, a transform-limited soliton pulse as short as 559 fs with a bandwidth of 4.78 nm is realized at 1563 nm. Numerous applications may benefit from the nonlinear saturable absorption properties of PbS QDs, such as near-infrared pulsed lasers and

关键词： QDs PbS ultrafast laser

Geochemistry and Petrogenesis of Volcanic Rocks from the Continent-Ocean Transition Zone in Northern South China Sea and Their Tectonic Implications

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Journal of Ocean University of China 2020年第5期19卷 1051-1061页

作者： xu Yue YANG Yaoming YU Hongjun GAO Wei GAO xiangxing LIU Baohua TIAN xu YANG Jichao ZHANG Wenquan Deep Sea Interdisciplinary Center Qingdao National Laboratory for Marine Science and TechnologyQingdao 266061China National Deep Sea Center Ministry of Natural ResourcesQingdao 266237China College of Marine Geosciences Ocean University of ChinaQingdao 266100China

Miocene–Pliocene(22–5 Myr) volcanism and associated seamounts are abundant in the continent-ocean transition(COT) zone in the margin of the north South China Sea(SCS). The petrogenesis of volcanic rocks from these seamounts and regional tectonic evolution of COT zone are poorly known. In this paper, we obtained whole-rock major and trace element compositions and Sr-Nd-Pb isotopic data for these volcanic rocks from the Puyuan and Beipo seamounts within COT zone, in northeastern SCS. Based on the geochemical analyses, the volcanic rocks are classified as alkaline ocean island basalts(OIB) and enriched mid-ocean ridge basalts(E-MORB). The OIBs from the Puyuan seamount are alkaline trachybasalts and tephrites that show enrichment of the light rare earth elements(LREE) relative to heavy rare earth elements(HREE) and more radiogenic Sr-Nd isotopic compositions, and have significant ‘Dupal isotopic anomaly'. In contrast, the E-MORBs from the Beipo seamount are tholeiitic basalts that have less enrichment in LREE and less radiogenic Sr-Nd isotopic compositions than the counterparts from the Puyuan seamount. Petrological and geochemical differences between the OIBs and MORBs from these two seamounts can be explained by different mantle sources and tectonic evolution stages of the COT zone. Syn-spreading OIB type basalts from the Puyuan seamount were derived from an isotopically ‘enriched', and garnet facies-dominated pyroxenitic mantle transferred by the Hainan mantle plume. In contrast, post-spreading E-MORB type basalts from the Beipo seamount are considered to be derived from the melting of isotopically ‘depleted' pyroxenite mantle triggered by lithosphere bending and subsequent post-rifting at the lower continental slope of the northern margin.

关键词： volcanic rocks geochemistry tectonic evolution South China Sea continent-ocean transition zone

Heterologous interactions between NS1 proteins from different influenza A virus subtypes/strains

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Science China(Life Sciences) 2012年第6期55卷 507-515页

作者： LI WeiZhong ZHANG Heng WANG GeFei ZHANG Chi ZENG xiangxing LIU Hui CHEN Xiaoxuan xu Yanxuan LI KangSheng Department of Microbiology and Immunology Key Immunopathology Laboratory of Guangdong ProvinceShantou University Medical CollegeShantou 515041China Department of Veterinary Medicine University of MarylandCollege ParkMD 20742USA Department of Ultrasonic Central Hospital of Luoyang CityLuoyang 471009China

Non-structural protein 1(NS1) of the influenza virus plays a crucial role in modulating the host immune response and facilitating virus replication.The formation of a homodimer or an oligomer is necessary for NS1 to exert its function efficiently.In the present study,the NS1 protein from the A/Shantou/602/06(H3N2) virus(herein abbreviated as NS32) was found to interact with NS1 from A/Shantou/169/06(H1N1),A/Chicken/Guangdong/1/05(H5N1) and A/Quail/Hong Kong/G1/97(H9N2)(abbreviated as NS11,NS51 and NS92,respectively) viruses,although NS32 shares 17.4% 20.9% sequence diversity with NS11,NS51 and NS92.This indicates that the heterologous interactions between NS1 proteins from different influenza A virus subtypes/strains may be a common event during co-infection.

关键词： A型流感病毒 NS1蛋白病毒亚型相互作用异源非结构蛋白病毒复制免疫反应

Reduction of the oxidative damage to HO-induced HepG2 cells via the Nrf2 signalling pathway by plant flavonoids Quercetin and Hyperoside

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Food Science and Human Wellness 2023年

作者： Meijing Zhang Gaoshuai Zhang xiangxing Meng Xinxin Wang Jiao Xie Shaoshu Wang Biao Wang Jilite Wang Suwen Liu Qun Huang xu Yang Jing Li Hao Wang Key Laboratory of Environmental Pollution Monitoring and Disease Control Ministry of Education Guizhou Medical University National Center of Supervision and Inspection for Processed Food Quality Tianjin Institute for Food Safety Inspection Technology College of Food Science & Technology Hebei Normal University of Science and Technology State Key Laboratory of Food Nutrition and Safety Tianjin University of Science and Technology (TUST) College of Chemical Engineering and Materials Science Tianjin University of Science and Technology (TUST) 4. Department of Agriculture Hetao College

Hyperoside and quercetin are similar in molecular structures. In this study， the antioxidant regulatory targets of hyperoside and quercetin are mainly in the Nrf2 pathway predicted by network pharmacology. And the antioxidant effect and mechanism of hyperoside and quercetin were measured and compared in H2O2-induced HepG2 cells and Caenorhabditis elegans. The findings indicated that quercetin was more effective than hyperoside in reducing oxidative damage， which was proved by improved cell viability， decreased reactive oxygen species (ROS) production， decreased cellular apoptosis， and alleviated mitochondrial damage. In addition， quercetin was more efficient than hyperoside in enhancing the expression of nuclear factor (erythroid-2-derived)-related factor 2 (Nrf2)-associated mRNAs， increasing the activities of superoxide dismutase (SOD)， glutathione peroxidase (GSH-Px)， and catalase (CAT)， and reducing the cellular malondialdehyde (MDA) content. Quercetin was superior to hyperoside in prolonging the lifespan of worms， decreasing the accumulation of lipofuscin， inhibiting ROS production， and increasing the proportion of skn-1 in the nucleus. With the Nrf2 inhibitor ML385， we verified that quercetin and hyperoside primarily protected the cells against oxidative damage via the Nrf2 signalling pathway. Furthermore， molecular docking and dynamics simulations demonstrated that the quercetin- Kelch-like ECH-associated protein 1 (Keap1) complex was more stable than the hyperoside-Keap1 complex. The stable structure of the complex might hinder the binding of Nrf2 and Keap1 to release Nrf2 and facilitate its entry into the nucleus to play an antioxidant role. Overall， quercetin had a better antioxidant than hyperoside.

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