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Direct conversion of lignin into arene products catalyzed by a niobium-based material

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Science Bulletin 2017年第18期62卷 1231-1232页

作者： limin qi College of Chemistry Peking University Beijing 100871 China

As a complex aromatic biopolymer that constitutes 25%–35%of renewable carbon on the earth,lignin is the only large-volume renewable source of aromatic chemicals[1].Lignin has an extended network built from alcohol monomers via intermolecular C–O and C–C bonds in a random order[2],leading to a highly irregular polymeric structure and a recalcitrant ***,lignin is broadly considered as an industrial waste product,and tradition-

关键词：芳烃化合物催化转化木质素直接转化产物材料生物聚合物聚合物结构

腹部超声中实时组织弹性成像联合剪切波速度测量在肝脏局灶性病变中的诊断价值

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临床研究 2024年第10期32卷 26-29页

作者：赵洁齐莉敏郑州颐和医院国际健康管理中心河南郑州450000 郑州颐和医院超声科河南郑州450000

目的分析腹部超声中实时组织弹性成像联合剪切波速度测量在肝脏局灶性病变中的诊断价值。方法选择2019年3月至2021年3月郑州颐和医院收治的90例肝脏局灶性病变患者作为研究对象,所有患者均接受腹部超声中实时组织弹性成像与剪切波速... 详细信息

目的分析腹部超声中实时组织弹性成像联合剪切波速度测量在肝脏局灶性病变中的诊断价值。方法选择2019年3月至2021年3月郑州颐和医院收治的90例肝脏局灶性病变患者作为研究对象,所有患者均接受腹部超声中实时组织弹性成像与剪切波速度测量,以术后病理结果作为金标准,对比腹部超声中实时组织弹性成像联合剪切波速度测量诊断在肝脏局灶性病变性质中的鉴别价值。绘制受试者工作特征(ROC)曲线,分析腹部超声中实时组织弹性成像、剪切波速度测量及联合检测对肝脏局灶性病变性质中的鉴别价值。结果以术后病理诊断结果为金标准,90例肝脏局灶性病变患者中恶性肿瘤有53个(58.89%),其中肝细胞癌35个(66.04%),肝转移癌10个(18.87%),胆管细胞癌8个(15.09%);良性肿瘤37个(41.11%),其中肝硬化结节12个(32.43%),血管瘤17个(45.94%),腺瘤4个(10.81%),炎性结节4个(10.81%)。腹部超声中实时组织弹性成像、剪切波速度测量及联合与金标准的一致性分别为0.402、0.586、0.767。三种诊断方式的特异度对比差异无统计学意义(P> 0.05);腹部超声中实时组织弹性成像、剪切波速度及联合诊断的准确度、灵敏度对比,以联合诊断最高,差异均有统计学意义(P <0.05);ROC曲线显示,腹部超声中实时组织弹性成像、剪切波速度及联合对肝脏局灶性病变的曲线下面积(AUC)分别为0.709(95%CI:0.599~0.818)、0.809(95%CI:0.716~0.901)、0.877(95%CI:0.794~0.960)。结论腹部超声中实时组织弹性成像与剪切波速度均可有效鉴别肝脏局灶性病变性质,但通过联合检测的方式可提高诊断效能,值得应用。

关键词：肝脏局灶性病变腹部超声实时组织弹性成像剪切波速度测量诊断效能

TiO_2 mesocrystals: Synthesis, formation mechanisms and applications

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Science China Chemistry 2012年第11期55卷 2318-2326页

作者： CAI JinGuang qi limin Beijing National Laboratory for Molecular Sciences State Key Laboratory for Structural Chemistry of Unstable and Stable SpeciesCollege of ChemistryPeking UniversityBeijing 100871China

Mesocrystals, which are assemblies of crystallographically oriented nanocrystals, have received increasing attention due to their unique properties such as high crystallinity, high porosity, oriented subunit alignment, and similarity to highly sophisticated biominerals. However, the controlled synthesis of TiO 2 mesocrystals has not been realized until recently, probably because of the difficulty in accurately controlling the reaction processes that produce TiO 2 crystals. In this review, recent advances in the synthesis and applications of TiO 2 mesocrystals are summarized with particular attention paid to the mechanisms of their formation. Three typical pathways for the preparation of TiO 2 mesocrystals are discussed, namely topotactic transformation, direct synthesis in solution, and growth on supports. The potential applications of TiO 2 mesocrystals in lithium ion batteries, photocatalysis, enzyme immobilization, and antireflection materials are also described.

关键词： mesocrystals TiO2 formation mechanisms topotactic transformation oriented attachment mesoscale assembly

Recent advances in fabrication of monolayer colloidal crystals and their inverse replicas

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Science China Chemistry 2014年第1期57卷 58-69页

作者： YE XiaoZhou qi limin Beijing National Laboratory for Molecular Sciences State Key Laboratory for Structural Chemistry of Unstable and Stable Species College of Chemistry Peking University

Monolayer colloidal crystals(MCCs)are two-dimensional(2D)colloidal crystals consisting of a monolayer of monodisperse colloidal particles arrayed with a 2D periodic *** recent years,MCCs have attracted intensive interest because they can act as 2D photonic crystals and be used as versatile templates for fabrication of various 2D nanostructure *** this review,we provide an overview of the recent progress in the controllable fabrication of MCCs and their inverse ***,some newly-developed methods for the self-assembly of MCCs based on different strategies including interfacial assembly and convective assembly are ***,some representative novel methods regarding the fabrication of various functional2D inverse replicas of MCCs,such as 2D arrays of nanobowls,nanocaps,and hollow spheres,as well as 2D monolayer inverse opals(MIOs),are *** addition,the potential applications of MCCs and their inverse replicas are discussed.

关键词： monolayer colloidal crystals,2D inverse replica,nanosphere lithography,self-assembly,replication,fabrication method

Solution-phase synthesis of inorganic nanostructures by chemical transformation from reactive templates

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Science China Chemistry 2010年第2期53卷 365-371页

作者： HUANG Teng qi limin Beijing National Laboratory for Molecular Sciences(BNLMS) State Key Laboratory for Structural Chemistry of Unstable and Stable SpeciesCollege of ChemistryPeking UniversityBeijing 100871China

The solution-phase synthesis by chemical transformation from reactive templates has proved to be very effective in morphology-controlled synthesis of inorganic nanostructures. This review paper summarizes the recent progress in solution-phase synthesis of one-dimensional and hollow inorganic nanostructures via reactive templates, focusing on the approaches developed in our lab. The formation mechanisms based on reactive templates are discussed in depth to show the general concepts for the preparation processes. An outlook on the future development in this area is also presented.

关键词： reactive template morphology-controlled synthesis nanostructures one-dimensional structures hollow structures

重症医学科产KPC-2肺炎克雷伯菌的耐药情况分析及同源性研究

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系统医学 2024年第4期9卷 48-51页

作者：戚丽敏陈建军睢宁县人民医院检验科江苏徐州221200 徐州市第一人民医院检验科江苏徐州221002

目的探究重症医学科产碳青霉烯酶-2(Klebsiella Pneumoniae Carbapenemase,KPC-2)肺炎克雷伯菌的耐药状况并分析其同源性情况。方法回顾性选取2020年10月—2022年9月睢宁县人民医院收治的46例重症医学科患者的临床资料,从中提取46株... 详细信息

目的探究重症医学科产碳青霉烯酶-2(Klebsiella Pneumoniae Carbapenemase,KPC-2)肺炎克雷伯菌的耐药状况并分析其同源性情况。方法回顾性选取2020年10月—2022年9月睢宁县人民医院收治的46例重症医学科患者的临床资料,从中提取46株耐青霉烯类肺炎克雷伯菌菌株,进行药敏性试验、mCIM及eCIM联合试验,并采用聚合酶链反应(Polymerase Chain Reaction,PCR)扩增法检测待测菌的耐药基因,实施序列检测,使用脉冲场凝胶电泳(Pulsed field Gel Electrophoresis,PFGE)实施同源性分析。结果待测菌对替加环素、复方新诺明、阿米卡星、妥布霉素及庆大霉素有敏感性;mCIM及eCIM试验结果显示46株耐青霉烯类肺炎克雷伯菌均产丝氨酸碳青霉烯酶;待测菌株携带肺炎克雷伯菌碳青霉烯酶基因阳性率达100.00%。结论产丝氨酸碳青霉烯酶是造成ICU分离耐青霉烯类肺炎克雷伯菌的耐药机制,酶基因为KPC-2型,且本院重症医学科存在耐青霉烯类肺炎克雷伯的克隆传播。

关键词：重症医学科肺炎克雷伯菌同源性耐药性

Inorganic/polymer hybrid layer stabilizing anode/electrolyte interfaces in solid-state Li metal batteries

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Nano Research 2020年第12期13卷 3230-3234页

作者： Yiran Hu Yiren Zhong limin qi Hailiang Wang Beijing National Laboratory for Molecular Sciences(BNLMS) College of Chemistry and Molecular EngineeringPeking UniversityBeijing100871China Department of Chemistry and Energy Sciences Institute Yale UniversityWest HavenCT06516USA

Li1.5Al0.5Ge1.5(PO4)3(LAGP)is a solid-state electrolyte with high ionic conductivity and air stability but poor chemical stability and high interfacial impedance when directly contacted with Li *** this work,we develop an inorganic/polymer hybrid interlayer composed of Li bis(trifluoromethylsulfonyl)imide/poly(vinylene carbonate)polymer electrolyte and SiO2 submicrospheres to stabilize the Li/LAGP *** polymeric component renders high ionic conductance and low interfacial resistance,whereas the inorganic component imparts flame retardancy and a physical barrier to the known Li-LAGP side reaction,together enabling stable Li stripping/plating for more than 1,500 h at room *** this interlayer at both electrodes,all-solid-state Li∥LiFePO4 full cells with stable cycling performance are also demonstrated.

关键词： Li1.5Al0.5Ge1.5(PO4)3(LAGP) hybrid interlayer solid-state electrolyte Li metal battery interface

Mesocrystalline TiO_(2) nanosheet arrays with exposed {001} facets: Synthesis via topotactic transformation and applications in dye-sensitized solar cells

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Nano Research 2017年第8期10卷 2610-2625页

作者： Yanhe Zhang Jinguang Cai Yurong Ma limin qi Beijing National Laboratory for Molecular Sciences(BNLMS) State Key Laboratory for Structural Chemistry of Unstable and Stable SpeciesCollege of ChemistryPeking UniversityBeijing 100871China

A facile,fluorine-free approach for synthesizing vertically aligned arrays of mesocrystaUine anatase TiO_(2) nanosheets with highly exposed{001}facets was developed through topotactic *** mesocrystalline{001}-faceted TiO_(2) nanosheet arrays vertically aligned on conductive fluorine-doped tin oxide glass were realized through topotactic conversion from single-crystalline precursor nanosheet arrays based on lattice matching between the precursor and the anatase *** morphology and microstructure of the{001}-faceted TiO_(2) nanosheets could be readily modulated by changing the reactant concentration and annealing *** to enhanced dye adsorption,reduced charge recombination,and enhanced light scattering arising from the exposed{001}facets,in addition to the advantageous features of low-dimensional structure arrays(e.g.,fast electron transport and efficient charge collection),the obtained TiO_(2) nanosheet arrays exhibited superior performance when they were used as anodes for dye-sensitized solar cells(DSSCs).Particularly,{001}-faceted TiO_(2) nanosheet arrays-15μm long annealed at 500℃showed a power conversion efficiency of 7.51%.Furthermore,a remarkable efficiency of 8.85%was achieved for a DSSC based on doubleqayered TiO_(2) nanosheet arrays-35μm long,which were prepared by conversion from the precursor nanoarrays produced via secondary hydrothermal growth.

关键词： titanium dioxide nanosheets {001}facets nanostructure arrays dye-sensitized solar cells mesocrystals

Reversible self-assembly of gold nanorods mediated by photoswitchable molecular adsorption

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Nano Research 2019年第7期12卷 1563-1569页

作者： qian Wang Di Li Junyan Xiao Fucheng Guo limin qi Beijing National Laboratory for Molecular Sciences (BNLMS) College of ChemistryPeking UniversityBeijing 100871China

Stimuli-responsive self-assembly of nanoparticles represents a powerful strategy to achieve reconfigurable materials with novel functionalities and promising *** this regard,light-induced reversible self-assembly (LIRSA) of nanoparticles is most attractive but it is usually limited by the prerequisite yet cumbersome chemical functionalizations of the particle *** we describe an innovative method to realize LIRSA of gold nanorods (GNRs) without surface functionalization through photoswitchable adsorption of an anionic azobenzene derivate *** LIRSA of GNRs is caused by the reversible change between a nearly neutral state and a highly charged state of the GNRs arising from the photoswichable adsorption of AzoNa triggered by *** LIRSA behavior can be readily adjusted by changing the concentration of AzoNa and the aspect ratio of the *** new LIRSA strategy may provide a convenient and efficient route toward light-triggered reversibly reconfigurable nanomaterials.

关键词： self-assembly of nanoparticles gold nanorods reversible self-assembly photoswichable adsorption reconfigurable nanomaterials