检索结果-南通市图书馆

Preparation of nanosize CdS/PANI Film and Its Photoelectric Properties

在线全文

学校读者我要写书评

暂无评论

Semiconductor Photonics and Technology 2004年第4期10卷 260-264页

作者： ZHONGHuai-zhen HEXiao-yun LIGuo-qiang CHENZhen CollegeofChem.andMater.Sci. FujianNormalUniversityFuzhou350007CHN

nanosize CdS semiconductor particles were synthesized using the solvothermal technique. The structure was characterized by means of XRD,TEM and ED techniques. PANI film was prepared by electro-chemistry method onto the indium-tin oxide glass. The nanoparticles were doped on PANI film by the dipping process, and the self-assembled nanoparticles-PANI composite film was acquired. The photoelectric properties of the self-assembled film were studied by PL and Z-scan method.

关键词： nanosize Polyaniline Composite film Semiconductor

Phase Transformation of nanosized Zirconia

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2006年第4期25卷 424-432页

作者：刘欣梅阎子峰 State Key Laboratory of Heavy Oil Processing CNPC Key Laboratory of Catalysis China University of Petroleum Dongying 257061 China

The nanosized zirconia was synthesized via solid state reaction in the presence of surfactant. The results indicate that crystal phase of zirconia can be controlled by tuning the synthesis parameters such as OH^-/Zr molar ratio, crystallizing temperature and time. It can be transformed among amorphous, tetragonal and monoclinic phases. The transformation is driven by particle size. The research shows the nanocrystalline zirconia possesses the higher thermal stability compared with amorphous framework. The ＂glow exotherm＂ can be observed for the amorphous samples. Otherwise, it is in the absence for nanocrystalline samples. Herein, the reason for retention of tetragonal zirconia is demonstrated.

关键词： solid state reaction zirconia nanosize phase transformation

Synthesis and Photoconductivity of nanosized Phthalocyanine

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2006年第4期22卷 533-535页

作者： Shuguang BIAN Xianggao LI Lei SHAO Jianfeng CHEN Key Lab for Nanomaterials Ministry of Education Beijing University of Chemical Technology Beijing 100029 China College of Chemical Engineering Tianjin University Tianjin 300072 China Research Center of the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical Technology. Beijing 100029. China

Functional phthalocyanine （Pc） compounds of H2Pc, TiOPc, FePc and CIAIPc were synthesized with a yield of 46.7%, 91.2%, 37.4% and 34.0%, respectively. nanosized TiOPc was synthesized via a one-step sol-gel method and effects of surfactant doses, nucleation temperature on TiOPc particle size and photoconductivity were investigated. When re（PEG）： m（TiOPc） was 0.1 and nucleation temperature was 0℃, the as-obtained TiOPc had the smallest particle size and largest specific surface area, which were 60 nm and 83m^2/g, respectively. TiOPc synthesized under these conditions also exhibits excellent photoconductivity with charging potential V0, dark decay speed Rd and energy for half-discharging of potential E1/2 being 1160 V, 30 V/s and 0.6 1x.s, respectively.

关键词： Phthalocyanine nanosize Synthesis Photoconductivity

Fabrication of Transparent Hydrophilous nanosized TiO2 Films via Layer-by-Layer Self-Assembly

在线全文

学校读者我要写书评

暂无评论

Fabrication of Transparent Hydrophilous Nanosized TiO2 Films...

Catalytic Activity of Ceria-Zirconia Nanostructured Materials Prepared via Reversed Microemulsion Method

第二届海峡两岸功能材料科技与产业峰会（2015）

作者： ZENG Zhiyong SHI Ying YUAN Sujun XIE Jianjun School of Materials Science and Engineering Shanghai University

Thetransparentnanosized TiO film was fabricated by a layer-by-layerassembly method starting from the highlydispersed anataseoppositely charged TiO nanoparticles without using *** positively charged TiO nanoparticles(ca.7 nm) and negatively charged TiOnanoparticles(ca.5 nm) were synthesized by a subsequentlyhydrothermal process. Thezeta-potential of the oppositely TiO nanoparticles depending on the p H of the TiO sol was discussed. Field-emission scanning electron microscopy,UV-vis transmittance spectra and Contact angle measurement were employed to characterize TiO *** the treatment of 500 ℃for 2hrs,the nano-structured TiO film showeda water contact angle ofbelow10°andthe relative transmittance to quartz glass of over 90%.

关键词： nanosize layer-by-layer self-assembly Titanium dioxide hydrophilicity

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Rare Earths 2005年第6期23卷 690-694页

作者：安源朱凌云王军沈美庆 Key Laboratory for Green Chemical Technology of State Education Ministry School of Chemical Engineering & Technology Tianjin University Tianjin 30007 China Key

Single-phase homogeneous Ce1-x ZrxO2 solid versed microemulsion method. The structural properties solutions with various compositions were synthesized using the reand performance of Ce1- xZrxO2 were studied using XRD, BET, SEM, HRTEM, TPR and CO oxidation measurements. The results show that in the range of x = 0.4 - 0.5 and x = 0.6 - 1.0, the solid solutions posses the cubic and the tetragonal phase structure, respectively, Solids obtained by the reversed microemulsion method were more homogeneous on the whole range of composition, XRD investigations of the prepared materials did not show segregation of cerium or zirconium oxides, Highly uniform nanosize solid solution particles of ceria-zirconia with high specific area （146.7 m^2·g^-1） were attained under the conditions of this study. The TPR results and CO oxidation measurements indicate that the performance of the CeO2-ZrO2 mixed oxides is strongly related to the composition and structure of the oxides. Enhancement of the activity was found for the catalyst prepared by reversed microemulsion method as compared to the sample prepared by sol-gel method.

关键词： CeO2-ZrO2 solid solution reversed microemulsion nanosize catalytic property carbon monoxide oxidation rare earths

Preparation and Magnetic Properties of Anisotropic SmCo5/Co Composite Particles

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2018年第2期31卷 143-147页

作者： Lin Lv Feng-Qing Wang Qiang Zheng Juan Du Xian-Lin Dong Ping Cui J.Ping Liu CAS Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Material Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China School of Materials and Chemical Engineering Ningbo University of Technology Ningbo 315211 China Department of Physics University of Texas at Arlington Arlington TX 76019 USA University of Chinese Academy of Sciences Beijing 100049 China Shanghai Institute of Ceramics CAS Shanghai 200050 China School of Physical Science and Technology Shanghai Tech University Shanghai 201210 China

Anisotropic SmCo5/Co nanocomposite powders have been prepared by electroless Co deposition on commercial SmCo5 powders with hydrazine as reducer. The Co particles are mainly in the range of 8–27 nm and form dense/continuous soft magnetic coatings on the surface of SmCo5 powders. Exchange coupling happened between the coated Co soft magnetic particles and the SmCo5 hard phase. As a result, SmCo5/Co nanocomposite powders with remanence of73.58 emu/g and energy product of 13.74 MGOe were obtained in the optimum condition, as compared with those of70.52 emu/g and 13.40 MGOe for uncoated SmCo5 powders. The effects of Co adding amount on Co particle size, coating morphology, and magnetic properties of SmCo5/Co products were investigated.

关键词： Nanocomposite Permanent magnet Coating nanosize Exchange coupling

Preliminary Synthesis and Characterization of Mesoporous Nanocrystalline Zirconia

在线全文

学校读者我要写书评

暂无评论

Journal of Natural Gas Chemistry 2003年第3期12卷 161-166页

作者： XinmeiLiu GaoqingLu ZifengYan TheNanomaterialsCentreandDepartmentofChemicalEngineering UniversityofQueenslandBrisbane4072Australia StateKeyLaboratoryforHeavyOilProcessing KeyLaboratoryofCatalysisCNPCUniversityofPetroleumDongying257062China

A novel method to prepare mesoporous nano-zirconia was developed. Thesynthesis was carried out in the presence of PEO surfactants via a solid-state reaction. Thematerials exhibit a strong diffraction peak at low 2θ angle and their nitrogenadsorption/desorption isotherms are typical of type IV with H1 hysteresis loops. The pore structureimaged by TEM can be described as wormhole domains. The tetragonal zirconia nanocrystals are uniformin size (around 1.5 nm) and their mesopores focus on around 4.6 nm. The zirconia nanocrystal growthis tentatively postulated to be the result of an aggregation mechanism. This study also revealsthat the PEO surfactants can interact with the Zr-O-Zr framework to reinforce the thermal stabilityof zirconia. The ratio of NaOH to ZrOCl_2, crystallization and calcination temperature play animportant role in the synthesis of mesoporous nano-zirconia.

关键词： solid-state reaction zirconia mesopore nanosize synthesis characterization

ISFET Based DNA Sensor: Current-Voltage Characteristic and Sensitivity to DNA Molecules

在线全文

学校读者我要写书评

暂无评论

Open Journal of Biophysics 2019年第4期9卷 239-253页

作者： Lusine Gasparyan Ilya Mazo Vahan Simonyan Ferdinand Gasparyan Argentis LLC Gaithersburg MD USA Yerevan State University Yerevan Armenia The Department of Biochemistry & Molecular Medicine The George Washington University Washington DC USA

Dependency of both source-drain current and current sensitivity of nanosize ISFET biosensor vs. concentration of DNA molecules in aqueous solution theoretically is investigated. In calculations it is carried out effects concerning charge carriers distribution in current channel and concerning carriers’ mobility behavior in high electrical fields in the channel. The influence of DNA molecules on the work of ISFET biosensors is manifested by a change in the magnitude of the gate surface charge. Starting with fairly low concentrations of DNA, ISFET sensors respond to the presence of DNA molecules in an aqueous solution which is manifested by modulation of channel conductance and therefore the source-drain current changes of the field-effect transistor. It is shown that the current sensitivity with respect to concentration of DNA molecules linearly depends on the source-drain voltage and reaches high values.

关键词： DNA ISFET Sensitivity nanosize Current Channel

Nano crystalline powders of NiCu ferrite and NiCuZn ferrite prepared from citrate gel method： Synthesis and cnaracterzation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Chemistry and Chemical Engineering 2009年第6期3卷 22-26,43页

作者： Y. L. N. Murthy I. K Kasi Viswanath T. Kondala Rao Rajendrasingh Department of Organic Chemistry Andhra University Visakhapatnam Andhra Pradesh 530003 India PG Department of Chemistry Government Degree College for Men Srikakulam Andhrapradesh 532001 India DRDO HQ DRDO Bhavan Delhi 110011 India

Nano size nickel copper ferrite powders （NiCuFe204） and nickel copper zinc ferrite powders have been prepared by a citrate gel precursor method. The resulting powders were characterized by X-ray diffraction （XRD） and scanning electron microscope （SEM）. The results showed that nickel copper ferrites and nickel copper zinc ferrites were also in the nanosaele. The NiCu ferrite powders showed extensive XRD fine broadening and sizes of crystals were calculated （from the XRD line broadening） as 26 run-44 run over the temperature range is 200-800℃. The NiCuZn ferrite powders showed XRD line broadening and sizes of of crystals were calculated 46-65 nm over 200-800℃.

关键词： nanosize citrate gel method nickel copper ferrite nickel copper zinc ferrite