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Chinese Journal of Polymer Science 2001年第3期19卷 297-301页

作者： Zi-chen li Yue Shen Yu-zeng liang fu-{3. li department of Polymer Science & Engineering College of chemistry Peking University{3., china beijing Univ Coll Chem Dept Polymer Sci & Engn Beijing 100871 Peoples R China

The morphological transition of molecular assemblies in aqueous solutions for a new amphiphilic diblock copolymer induced by changing the initial solvent conditions was studied by transmission electron microscopy (TEM). The copolymer was polystyrene(77)-b-poly[2-(beta -D-glucopyranosyloxy)ethyl acrylate (6)] (PSt(77)-b-PGEA(6)) and the solvent was a mixture of DMF and THF. PSt(77)-b-PGEA(6) yields vesicles and tubules when it is initially dissolved in THF and DMF respectively. The morphological transition between vesicles and tubules can be achieved by simply varying the amounts of THF and DMF, or changing the temperature at which the aggregates were prepared.

关键词： block copolymer amphiphile glycopolymer self-assembly tubule vesicle

SURFACE　MODIFICATION　OF　PHOSPHOliPID　liPOSOMES　BY　INCORPORATION　OF　GLYCOliPID

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Chinese Chemical Letters 1995年第11期6卷 947-950页

作者： Zi Chen li Wei HE fu mian li(department of chemistry, Peking Univerisity,{3.) beijing Univ Dept Chem Beijing 100871 Peoples R China

Two single-chain glycolipids, octadecyl-β-D-glucopyranoside(1) and 2-octadecanamido-2-deoxy-D-glucopyranose(2) were synthesized and their dispersing properties in water were studied. Incorporation of 1 into the phospholipid liposomes could inhibit the aggregation of liposomes and improve the molecular packing in the bilayer membranes.

关键词： SURFACE GLYCOliPID INCORPORATION liPOSOMES MODIFICATION OF PHOSPHOliPID BY

SYNTHESIS AND CHARACTERIZATION OF POLYSILOXANE CONTAINING OliGO(OXYETHYLENE)SULFATE SALT

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Chinese Journal of Polymer Science 2000年第2期18卷 109-113页

作者： Shu-wen Hu Zheng-cheng Zhang FanYi Shi-bi Fang Xin-feng Zhang fu-mian li department of chemistry, Peking University, beijing 100871, china Chinese Acad Sci Inst Chem Beijing 100080 Peoples R China Peking Univ Dept Chem Beijing 100871 Peoples R China

Solvent-free polymeric alkali-metal ion conductors, consisting of a comb-like polysiloxane with oligo(oxyethylene) side chains and pendant sulfate groups were synthesized by the hydrosilylation of allyl oligo(oxyethylene) sulfate salt and allyl methoxy oligo(oxyethylene) with poly(methylhydrosiloxane). The factors influncing the ionic conductivity of the resulting polymer such as the electrolyte content and the nature of the alkali-metal were investigated. The temperature dependence of conductivity was determined, and the ionic conductivity of the polymer follows the Vogel-Tammann-fulcher (VTF) equation.

关键词： hydrosilylation electrolytes ionic conductivity

SYNTHESIS　AND　VESICLES　OF　A　DOUBLE-CHAIN　GLYCOliPID

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Chinese Chemical Letters 1996年第5期7卷 401-402页

作者： Zi Chen li Wei HE fu mian li (department of chemistry Peking University Beijng {3.) beijing UNIV DEPT CHEMBEIJING 100871PEOPLES R CHINA

Abstract: A double-chain glycolipid, dioctadecyl-2-glucopyronosylthio-succinate(1) was *** glycolipid itself formed stable vesicles. It could also be incorporated into the lipid bilayer membrane to form Stable dried l...

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How interfacial electron-donating defects influence the structure and charge of gold nanoparticles on TiO_(2)support

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Nano Research 2024年第7期17卷 5965-5974页

作者： Guang-Jie Xia Yu fu Wei Cao Jun li Yang-Gang Wang department of chemistry and Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and TechnologyShenzhen 518055China School of Physical Sciences Great Bay UniversityDongguan 523000China department of chemistry Tsinghua UniversityBeijing 100084China

The reduction degree of TiO_(2)support is critical to the performances of metal *** many previous theoretical calculations,only the bridge oxygen vacancy(Ov)was considered as the electron-donating defect on reduced rutile TiO_(2)(r-TiO_(2−x))***,titanium adatoms(Tiad.),oxidized titanium islands(***),and acid hydroxyls(ObrH)also exist at the metal/support *** conducting density functional theory(DFT)calculations and ab initio molecular dynamics(AIMD)simulations,we compared r-TiO_(2−x)surfaces with Ov,Tiad.,***,and ObrH sites loaded with Au nanoparticles(NPs).The results showed the Au NPs were oxygen-phobic but titanium-philic,resulting in wetting of Ov and *** short contact with *** and *** Bader charges of Au NPs(QM)showed a good linear relationship with the ideal number of donating electrons(Ne)from the defective sites(QM=−KeNe+QM,S),demonstrating the intrinsic electron allocation at the *** Ov,Tiad.,and *** exhibited similar slopes(Ke),relatively steeper than that of *** means in the scope of Au NP charge state,the *** *** have a close electron-donating ability with Ov,but the ObrH donates relatively fewer *** linear relationship can be extended approximately to other *** higher the metal work function,the steeper the Ke for easier electron donation from defective *** stronger the metal oxygen affinity,the more positive the intercept(QM,S).That explains the easy generation of metallic or negative Pt and Au NPs on r-TiO_(2−x),but hard for Cu and Zn in *** provides theoretical guidance for regulating the charge of metal NPs over TiO_(2−x)supports.

关键词： metal-support interaction titanium oxide oxygen vacancy surface hydroxyl titanium adatom

Nanostructured Lead Sulfide Containing Nanoholes Templated by Lyotropic Hexagonal liquid Crystals

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Chinese Chemical Letters 2000年第5期11卷 467-470页

作者： Yan li Qing Min ZHANG fu Zhi HUANG Zhen Nan GU (department of Material {3., Peking University, beijing 100871) Peking Univ Dept Chem Mat Beijing 100871 Peoples R China

The hexagonal liquid crystal mediated synthesis of nanostructured PbS was studied. Thioacetamide and lead acetate were used as the sulfide and lead source, respectively. It was found that the nanohole structure of PdS... 详细信息

关键词： hexagonal liquid crystal nanomaterial lead sulfide

Designing simple non-fused terthiophene-based electron acceptors for efficient organic solar cells

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Journal of Energy chemistry 2024年第9期96卷 501-508页

作者： Jiayu li Kun li Zhe Mei Yu Chen Qian Xie Chenxu Yu Xuefeng liu Yanqi Wang Yishi Wu Qing liao Cunbin An Hongbing fu beijing Key Laboratory for Optical Materials and Photonic Devices Department of ChemistryCapital Normal UniversityBeijing 100048China beijing Synchrotron Radiation Laboratory Institute of High Energy PhysicsChinese Academy of Sciences(CAS)Beijing 100049China

Low-cost photovoltaic materials are essential for realizing large-scale commercial applications of organic solar cells(OSCs).However,highly efficient OSCs based on low-cost photovoltaic materials are scarce due to a deficiency in understanding the structure-property ***,we investigated two low-cost terthiophene-based electron acceptors,namely,3.C8 and 3.EH,with 3.4-bis(octan-3.yloxy)thiophene,differing only in the alkylated *** acceptors exhibit low optical gaps(∼1.43.eV)and possess deep highest occupied molecular orbital(HOMO)levels(∼−5.8 eV).Notably,the single-crystal structure of 3.EH demonstrates highly planar conjugated backbone and strongπ-πstacking between intermolecular terminal groups,attributed to the presence of the bulky alkylated noncovalently conformational *** utilizing both acceptors to fabricate OSCs,the 3.C8-based device exhibited a power conversion efficiency(PCE)of 11.1%,while the 3.EH-based OSC demonstrated an excellent PCE of 14.4%.This PCE is the highest among OSCs based on terthiophene-containing electron *** results offer a new strategy for designing low-cost electron acceptors for highly efficient OSCs.

关键词： Organic solarcells Low cost Terthiophene Non-fused electron acceptor

Probing the electric double layer structure at nitrogen-doped graphite electrodes by constant-potential molecular dynamics simulations

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Journal of Energy chemistry 2024年第6期93卷 299-305,I0008页

作者： Legeng Yu Nan Yao Yu-Chen Gao Zhong-Heng fu Bo Jiang Ruiping li Cheng Tang Xiang Chen Tsinghua Center for Green Chemical Engineering Electrification(CCEE) Department of Chemical EngineeringTsinghua UniversityBeijing 100084China beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China National Materials Corrosion and Protection Data Center University of Science and Technology BeijingBeijing 100083China Ordos Carbon Neutral Research and Application Co. Ltd.Ordos 017010Inner Mongoli1China Institute for Carbon Neutrality Tsinghua UniversityBeijing 100084China Center for Next-Generation Energy Materials and School of Chemical Engineering Sungkyunkwan University2066 Seobu-roJangan-guSuwon-siGyeonggi-do 16419Republic of Korea

Electric double layer(EDL)is a critical topic in electrochemistry and largely determines the working performance of lithium ***,atomic insights into the EDL structures on heteroatom-modified graphite anodes and EDL evolution with electrode potential are very ***,a constant-potential molecular dynamics(CPMD)method is proposed to probe the EDL structure under working conditions,taking N-doped graphite electrodes and carbonate electrolytes as an *** interface model was developed,incorporating the electrode potential and atom *** a result,an insightful atomic scenario for the EDL structure under varied electrode potentials has been established,which unveils the important role of doping sites in regulating both the EDL structures and the following electrochemical reactions at the atomic ***,the negatively charged N atoms repel the anions and adsorb li~+at high and low potentials,*** preferential adsorption suggests that Ndoped graphite can promote li~+desolvation and regulate the location of li~+*** CPMD method not only unveils the mysterious function of N-doping from the viewpoint of EDL at the atomic level but also applies to probe the interfacial structure on other complicated electrodes.

关键词： lithium batteries Graphite N-doping Electric double layer Molecular dynamics Constant potential method Electrode potential

Establishment of NaLuF_(4):15%Tb-based low dose X-PDT agent and its application on efficient antitumor therapy

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International Journal of Minerals,Metallurgy and Materials 2024年第3期31卷 599-610页

作者： Yi Tian Zhiguang fu Xiaosheng Zhu Chunjing Zhan Jinwei Hu li Fan Chaojun Song Qian Yang Yu Wang Mei Shi department of Radiation Oncology Xijing HospitalThe Fourth Military Medical UniversityXi’an 710032China department of Oncology Air Force Medical CenterPLAThe Fourth Military Medical UniversityBeijing 100142China department of Tumor Radiotherapy Air Force Medical CenterPLAThe Fourth Military Medical UniversityBeijing 100142China department of Gastroenterology Air Force Hospital of Southern Theater CommandGuangzhou 510062China department of Pharmaceutical chemistry and Analysis School of PharmacyThe Fourth Military Medical UniversityXi’an 710032China School of life Sciences Northwestern Polytechnical UniversityXi’an 710072China Institue of Materia Medica School of PharmacyThe Fourth Military Medical UniversityXi’an 710032China

X-ray excited photodynamic therapy(X-PDT)is the bravo answer of photodynamic therapy(PDT)for deep-seated tumors,as it employs X-ray as the irradiation source to overcome the limitation of light penetration ***,high X-ray irradiation dose caused organ lesions and side effects became the major barrier to X-PDT *** address this issue,this work employed a classic-al co-precipitation reaction to synthesize NaLuF_(4):15%Tb^(3.)(NLF)with an average particle size of(23.48±0.91)nm,which was then coupled with the photosensitizer merocyanine 540(MC540)to form the X-PDT system NLF-MC540 with high production of singlet *** system could induce antitumor efficacy to about 24%in relative low dose X-ray irradiation range(0.1-0.3.Gy).In vivo,when NLF-MC540 irradiated by 0.1 Gy X-ray,the tumor inhibition percentage reached 89.5%±5.7%.The therapeutic mechanism of low dose X-PDT was found.A significant increase of neutrophils in serum was found on the third day after *** immunohistochemical staining of tumor sections,the Ly6G^(+),CD8^(+),and CD11c^(+)cells infiltrated in the tumor microenvironment were *** the bilat-eral tumor model,the NLF-MC540 with 0.1 Gy X-ray irradiation could inhibit both the primary tumor and the distant tumor ***-tected by enzyme linked immunosorbent assay(EliSA),two cytokines IFN-γand TNF-αin serum were upregulated 7 and 6 times than negative control,*** by enzyme linked immune spot assay(EliSPOT),the number of immune cells attributable to the IFN-γand TNF-αlevels in the group of low dose X-PDT were 14 and 6 times greater than that in the negative control group,***,it conclude that low dose X-PDT system could successfully upregulate the levels of immune cells,stimulate the secretion of cy-tokines(especially IFN-γand TNF-α),activate antitumor immunity,and finally inhibit colon tumor growth.

关键词： X-ray excited photodynamic therapy singlet oxygen low dose X-Ray irradiation efficient antitumor therapy anti-tumor immunity

Synthesis of Cholesterol Derivative with Amino Acid as Hydrophilic Group and the Vesicles Prepared Therefrom

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Chinese Chemical Letters 1999年第12期10卷 0-0,0-0页

作者： Zi Chen li Wei JIN fu mian li(College of chemistry, Peking University, beijing 100871)

Three single chain amphiphilic cholesterol derivatives with amino acid as hydrophilicgroups, Ⅰ,Ⅱ and Ⅲ, were synthesized. When they were hydrated in water, they can all formlamellae structures as evidenced by DSC measurement. The lamellae states of Ⅱ and Ⅲ can beconverted to vesicles upon ultrasonication of the diluted aqueous solutions. The vesicles showedvery slow release rate of the encapsulated water-soluble dyes, indicating that they are stable andbelong to the least permeable vesicles.

关键词： Vesicles amphiphiles amino acid cholesterol.