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Synthesis and characterization of tungsten and barium co-doped La2Mo2O9 by sol-gel process for solid oxide fuel cells

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Journal of Rare Earths 2019年第9期37卷 984-988,I0004页

作者： Chang′an Tian Lingbo Shao Dongdong Ji Jie Yang Jinsong Xie Qiyi Yin huirong le Department of Chemistry and Materials Engineering Hefei UniversityHefei 230601 China Department of Engineering College of Engineering and Technology University of DerbyDerby DE22 3AWUnited Kingdom

Herein,we demonstrate the synthesis of W and Ba co-doped La2Mo2O9(LBMWO)nanocrystalline powder by a sol-gel *** all the compositions have general formulae La1.9Ba0.1Mo2-xWxO8.95(x=0-0.40).The crystal structure,microstructure and conductivity of LBMWO were characterized by X-ray diffraction,scanning electron microscopy and electrical impedance *** addition,the thermal and decomposition properties of the LBMWO gel were analyzed by differential scanning *** results reveal that all LBMWO powders calcined at 700℃have a cubic structure;the average crystallite size is about 48 *** unit cell parameter of LBMWO powders increases with increase in W *** as-synthesized nanocrystalline LBMWO samples exhibit excellent sinterability and a relatively lower sintering temperature of 900℃.A high relative density of-96%is achieved after sintering at 900℃which is in good agreeme nt with the re sults of the ***,W and Ba codoping suppresses the phase transition and effectively stabilizes theβ-phase at low *** the same time,La1.9Ba0.1Mo1.85W0.15O8.95 exhibits high ionic conductivity,3.07 x 10^-2 S/cm at 800℃.It is therefore concluded that co-doping can improve the properties of La2MO2O9 electrolytes.

关键词： La2Mo2O9 Phase transition Conductivity Sol-gel Rare earths

Developing hierarchical CdS/NiO hollow heterogeneous architectures for boosting photocatalytic hydrogen generation

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Nano Research 2022年第3期15卷 2003-2012页

作者： Chonghai Deng Fan Ye Tao Wang Xiaohui Ling Lulu Peng Hong Yu Kangzhe Ding Hanmei Hu Qiang Dong huirong le Yongsheng Han School of Energy Materials and Chemical Engineering Hefei UniversityHefei 230601China Anhui Province Key Laboratory of Advanced Building Materials Anhui Jianzhu UniversityHefei 230601China The Future Lab Tsinghua UniversityBeijing 100084China State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

The hierarchical binary CdS/NiO hollow heterogeneous architectures(HHAs)with p–n heterojunction are constructed by a facile microwave-assisted wet chemical process for high-efficient photocatalytic hydrogen evolution reaction(HER)from *** as-designed CdS/NiO HHAs are composed of hexagonal n-type CdS nanoparticles with a size in the range of 20–40 nm attaching to cubic p-type NiO hollow microspheres(HMSs)which are aggregates of porous nanoplates with a thickness of about 20 *** photocatalytic water splitting over CdS/NiO HHAs is significantly increased under simulated solar irradiation,among which the most active sample of CdS/NiO-3(the mass ratio of CdS to NiO is 1:3)exhibits the fastest photocatalytic HER rate of 1.77 mmol∙g^(−1)∙h^(−1),being 16.2 times than that of pure *** boosted photocatalytic HER could be attributed to the synergistic effect on the proportional p–n heterojunction with special hierarchical hollow and porous morphology,an enhancement of visible light absorption,and an improvement of photoinduced charge separation as well as the photo-stability given by the composite *** work shows a viable strategy to design the heterojunction with special morphology for the efficient hydrogen generation by water splitting utilizing solar energy.

关键词： CdS nanoparticls NiO hollow microspheres p-n heterojunction hierarchical structure photocatalytic hydrogen evolution

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光催化纳米抗微生物自清洁复合材料研究进展

科技导报 2023年第8期41卷 113-119页

作者：何伟伟赵云乐恢榕清华大学未来实验室北京100084

表面光催化材料广泛用于表面自清洁、污水处理、水制氢等领域。特别是复合半导体纳米材料,利用p-n结原理可以大幅度提高表面自由电子和电子空穴浓度,从而提高吸收太阳光的能力,具有广阔的应用前景。阐述了纳米光催化材料领域的研究进展... 详细信息

表面光催化材料广泛用于表面自清洁、污水处理、水制氢等领域。特别是复合半导体纳米材料,利用p-n结原理可以大幅度提高表面自由电子和电子空穴浓度,从而提高吸收太阳光的能力,具有广阔的应用前景。阐述了纳米光催化材料领域的研究进展,以及在食品包装、医疗器械、交通设备及建筑材料领域抗菌自清洁的应用前景。

关键词：表面涂层抗菌材料自清洁光催化

慢性乙型肝炎患者胃粘膜HBV-DNA检测及临床意义

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微循环学杂志 2007年第3期17卷 44-45页

作者：乐惠荣张巍湖北省中医院检验科武汉430061 武汉市十一医院

目的:检测慢性乙型肝炎(乙肝)患者乙肝病毒脱氧核糖核酸(HBV-DNA),探讨HBV与胃粘膜病变的关系。方法:选择慢性乙肝并伴有慢性胃炎的患者58例(H组)及慢性胃炎但其血清HBV标志物(HBVM)和HBV-DNA均阴性对照组52名(C组),两组均进行胃镜检查... 详细信息

目的:检测慢性乙型肝炎(乙肝)患者乙肝病毒脱氧核糖核酸(HBV-DNA),探讨HBV与胃粘膜病变的关系。方法:选择慢性乙肝并伴有慢性胃炎的患者58例(H组)及慢性胃炎但其血清HBV标志物(HBVM)和HBV-DNA均阴性对照组52名(C组),两组均进行胃镜检查,同时取胃粘膜,H组取空腹静脉血液,采用荧光定量聚合酶链反应(FQ-PCR)方法进行血清、胃粘膜HBV-DNA含量和血清HBVM检测。结果:H组血清和胃粘膜HBV-DNA阳性例数分别为38例(65.52%)和46例(79.31%),两者相比有显著性差异(χ2=6.125,P<0.05);两者HBV-DNA含量显著正相关。H组32例血清HBeAg阳性患者的血清和胃粘膜HBV-DNA均为阳性,而26例血清HBeAg阴性患者的血清和胃粘膜HBV-DNA阳性只有6例(23.1%)和14例(53.8%)。C组胃粘膜HBV-DNA全部阴性。胃镜下观察H组患者广泛存在胃窦炎,C组以慢性浅表性胃炎为主。结论:HBV存在于胃粘膜中,可能引起胃部的炎性损伤。

关键词： HBV-DNA检测慢性乙型肝炎患者胃粘膜病变临床意义乙型肝炎病毒(HBV) 慢性乙肝胃肠道粘膜 DNA含量

通过氢还原热处理提升TiO_(2)薄膜的抗菌性能

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中国表面工程 2023年第1期36卷 77-84页

作者：赵云何伟伟许建兵苏虹阳刘鹏乐恢榕陈迪清华大学未来实验室北京100084 清华大学美术学院北京100084

提升在可见光区间的抗菌效率一直是二氧化钛(TiO_(2))抗菌性能研究的重要方向.采用脉冲激光沉积(PLD)制备TiO_(2)薄膜,并通过氢还原热处理的方法提升TiO_(2)表面的氧空位浓度从而增强其抗菌性能.结果发现,在以单晶氧化钇稳定的氧化锆(Y... 详细信息

提升在可见光区间的抗菌效率一直是二氧化钛(TiO_(2))抗菌性能研究的重要方向.采用脉冲激光沉积(PLD)制备TiO_(2)薄膜,并通过氢还原热处理的方法提升TiO_(2)表面的氧空位浓度从而增强其抗菌性能.结果发现,在以单晶氧化钇稳定的氧化锆(YSZ)为衬底时,生长的TiO_(2)薄膜为高度择优取向的锐钛矿相.生长温度越高,锐钛矿相的XRD衍射峰越强,薄膜越致密.将在600℃下生长的350 nm厚的TiO_(2)薄膜进行抗菌性能测试,发现其抗菌率约为86%.对样品进一步在4%H2氛围下进行还原处理,发现其抗菌率提升到约为97%.通过XPS、UV-Visible和PL测试,发现TiO2经过还原热处理后在其表面形成更多的氧空位,在TiO_(2)带隙中形成氧空位缺陷能级,导致在可见光区域吸光性能增强,使其具有更高的抗菌性能.通过氢还原过程调控材料的缺陷组成,并研究TiO_(2)薄膜的光催化抗菌性能及抗菌机理.这种简易的调控TiO_(2)光吸收的方法可为规模生长提供技术可行性.

关键词：脉冲激光沉积 TiO_(2)薄膜抗菌还原热处理光吸收效率

Integrating well logs, 3D seismic, and earthquake data for comprehensive prediction of 3D in-situ stress orientations: A case study from the Weiyuan area in the Sichuan Basin, China

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Petroleum Science 2025年第1期22卷 210-221页

作者： Huan Cao Yang Zhao Hai-Chao Chen le-le Zhang Cheng-Gang Xian Ji-Dong Yang Lu Liu State Key Laboratory of Petroleum Resources and Engineering and Unconventional Petroleum Research Institute China University of Petroleum (Beijing) Department of Geophysics China University of Petroleum (East China) Aramco Beijing Research Center Aramco Asia

Determining the orientation of in-situ stresses is crucial for various geoscience and engineering applications. Conventional methods for estimating these stress orientations often depend on focal mechanism solutions(FMSs) derived from earthquake data and formation micro-imager(FMI) data from well ***, these techniques can be costly, depth-inaccurate, and may lack spatial coverage. To address this issue, we introduce the use of three-dimensional(3D) seismic data(active sources) as a lateral constraint to approximate the 3D stress orientation field. Recognizing that both stress and fracture patterns are closely related to seismic velocity anisotropy, we derive the orientation of azimuthal anisotropy from multi-azimuth 3D seismic data to compensate for the lack of spatial stress orientation information. We apply our proposed workflow to a case study in the Weiyuan area of the Sichuan Basin, China, a region targeted for shale gas production. By integrating diverse datasets, including 3D seismic, earthquakes, and well logs, we develop a comprehensive 3D model of in-situ stress(orientations and magnitudes). Our results demonstrate that the estimated anisotropy orientations from 3D seismic data are consistent with the direction of maximum horizontal principal stress(SHmax) obtained from FMIs. We analyzed 12earthquakes(magnitude > 3) recorded between 2016 and 2020 for their FMSs and compressional axis(Paxis) orientations. The derived SHmax direction from our 3D stress model is 110°ES(East-South), which shows excellent agreement with the FMSs(within 3.96°). This close alignment validates the reliability and precision of our integrated method for predicting 3D SHmax orientations.

关键词： In-situ stress orientation SHmax Azimuthal velocity anisotropy Focal source mechanism Formation micro-imager

Engineering strategies of biomaterial-assisted exosomes for skin wound repair:Latest advances and challenges

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Chinese Chemical letters 2025年第1期36卷 99-109页

作者： Yang Xu le Ma Yang Wang Chunmeng Shi Institute of Rocket Force Medicine State Key Laboratory of Trauma and Chemical PoisoningThird Military Medical University(Army Medical University)Chongqing 400038China

The treatment of skin wounds,especially chronic wounds,remains a critical clinical challenge and places a heavy burden on patients and healthcare *** recent years,the engineering strategy of using biomaterial-assisted exosomes has emerged as a powerful tool for skin *** to treatments such as debridement and regular dressing changes,the design of biomaterial-assisted exosomes not only maintains the bioactivity of exosomes at the wound site but also provides an appropriate microenvironment for the repair of complex tissues,thereby accelerating wound *** review systematically introduces the general characteristics of exosomes and their functions in skin wound healing,highlights recent advances in classification of natural exosomes and engineering methods which enriching their functions in intercellular ***,various emerging and innovative approaches based on biomaterials delivery of exosomes are comprehensively *** review seeks to bring an in-depth understanding of bioactive dressings based on exosomes therapeutic strategies,aiming to facilitate new clinical application value.

关键词： Exosomes Biomaterials Hydrogel Delivery system Wound healing

Emerging progress:photochemical transformation of nitroso compounds

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Science China Chemistry 2025年第1期68卷 118-133页

作者： Ze-le Chen Qiang-Qiang Li Armido Studer Jun Xuan Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials School of Chemistry&Chemical EngineeringAnhui UniversityHefei 230601China Organisch-Chemisches Institut Universitat MünsterMunster 48149Germany

Nitroso compounds have emerged as highly valuable reaction partners or reagents in organic synthesis due to their rich *** versatile profile of these compounds allows them to function as electrophiles,nucleophiles,diradicals,and radical acceptors in diverse *** recent years,notable progress has been made in harnessing photochemical reactions with nitroso compounds to prepare N,O-containing structures using mild and eco-friendly *** nitroso compounds like nitrosoarenes,acyloxy nitroso compounds,N-nitrosoamines and nitrites have received significant attention for their ability to introduce NO moieties into complex molecules that are otherwise difficult to *** this review,we provide an overview of the recent advancements in the visible light-induced conversion of nitroso compounds,with particular emphasis on their role as bifunctional reagents and acceptors of radicals,carbenes and nitrenes.

关键词： nitroso compounds photochemistry radical reaction carbene transformation nitrosoarenes

Exotic hybrid pseudopotentials at finite temperature and chemical potential

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Chinese Physics C 2025年第1期49卷 186-194页

作者： le Zhang Fei-Yang Cai Xun Chen College of Physics and Electronic Science Hubei Normal UniversityHuangshi 435002China

Using gauge/gravity duality,we studied the exotic hybrid pseudopotentials at finite temperature and chemical *** Σ hybrid meson can be described by a model including an object called"defect"on a string linking the quark and *** Σ_(u)^(-) hybrid potential at zero temperature and chemical potential was first proposed by Andreev and is perfectly *** this study,we extended the aforementioned model to finite chemical potential and compared the separate distance and pseudopotentials of Σ_(g)^(+) and Σ_(u)^(-).Unlike the Σ_(g)^(+) ground state,the Σ_(u)^(-),hybrid pseudopotentials no longer exhibit Coulomb-like behavior at short *** addition,temperature and chemical potential have a significant impact on the Σ_(u)^(-) hybrid *** screen distances and hybrid pseudopotentials of Σ_(u)^(-) significantly decrease when increasing temperature and chemical *** represented the melting diagram of Σ_(g)^(+) and Σ_(u)^(-) in the T-μ plane and confirmed that the quark-antiquark pair in Σ_(u)^(-) excited state is easier to melt than that in Σ_(g)^(+) ground state.

关键词： holographic QCD hybrid potential heavy quark