共查询到20条相似文献,搜索用时 52 毫秒
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《中国化学快报》1994,(10)
THEREACTIONOF(μ_3-CPh)Co_3(CO)_9WITH TRANSITIONMETALCARBONYLANIONM(CO)_3(RCOCp)ANDCHARACTERIZATIONOFCLUSTERS(μ_3-CPh)CO_2M(CO)_8(RCOCPp)(M=Mo,W;R=H,CH_3.C_2H_5O)Authortowhomcormspondenceshouldaddressed.ExperimentalsectionGeneralprocedureandmaterialAlloperationwascarriedoutunderhighlypurenitrogenatmosphereusingshadardSchlenlcandvacuumtechniques.He-cane,benzeneandtetrahydrofuranwerepredriedoversodiumwireanddistilledfromsodium-benzophenoneundernitrogen.NaM(CO)3(RCOCP)andPhCCo3(CO),werepreparedaccordingtoliteratUre 相似文献
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碳氟醇对阳离子表面活性剂表面活性及胶团反离子结合度的影响 总被引:1,自引:0,他引:1
用表面张力及电动势法研究了C10H21N(CH3)3Br、C12H25N(CH3)3Br与C3F7CH2OH混合水溶液的表面与胶团性质.结果表明,对于阳离子表面活性剂,C3F7CH2OH的加入一方面增加表面活性,另一方面降低胶团反离子结合度.后者不同于阴离子表面活性剂/C3F7CH2OH混合体系,可归因于C3F7CH2OH略有酸性,因而具备一些类似阴离子表面活性剂的性质. 相似文献
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煤的油团聚的表面热力学理论 总被引:2,自引:0,他引:2
本文试图用过程的自由能改变来预言油团聚的热力学稳定性,对具有最低自由能的状态被认为是最稳定状态。本文导出了油团聚过程的自由能,(dF)T,p=4πr1^2γ^23「(1-cosψ)√2(1-cosψ)-cosθ(1-ψ-n^2)。由此可见,自由能的降低是由油滴对煤粒大小的比值,三相接触角和油水之间的表面张力来确定。 相似文献
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SynthesisandCrystalStructureofCd(tla)(NO_3)_2[TLA=tris(6-methyl-2-pyridylmethyl)amine]BUXian-He;ZHANGZhi-Hui;ZHUZhi-Ang;CHENYu... 相似文献
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3,5—二溴—PADAP分光光度法测定微量NO2—离子的研究 总被引:3,自引:0,他引:3
系统研究了3,5-二溴-PADAP在酸性介质中质子化后与NO2和SC怙元离子缔合物的最佳条件。提出了测定微量NO2的光度新方法,表观摩尔吸光系数ε630=1.2×10^4L·mol^-1·cm^-1,缔合物组成比为n(3,5-fg ithd-PADAP):n(NO2):n(SCN)=1:1:!。sg if yietggfuii wsg k tmg jg NO2r impg,gn x maw yyi 相似文献
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《高等学校化学研究》1997,(4)
MagneticPropertiesofHeteropolyComplexesα┐NamHn[GaW9M3(H2O)3O37]·16H2O(M=Co(Ⅱ),Mn(Ⅱ),Cr(Ⅲ))*WANGLi**,LIUZong-rui**,ZHOUYun-sha... 相似文献
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《高等学校化学研究》1996,(2)
INDOStudiesonElectronicStructuresof(C_8H_8)Ln(2,4-C_4H_11)(THF)(Ln=Nd,Sm,Er)WANGZhi-zhong*,FENGJian-nan,ZHANGSo-boandLIUJu-zh... 相似文献
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测定了O,O(2,2'-联萘基)-N-(α-苯基乙基)膦酰胺RS体与乙醇形成的分子化合笺晶体结构。晶体学数据为:C28H22NO3P.C2H5OH,Mr=497.5,单斜晶系,P21空间群,a=9.359(2),b=12.806(3),c=11.641(A),β=111.62(3)°,z=2,v=1294,0(5)a^3,Dc=1.277g/cm^3,MoKa(λ=0.71073A)射线,μ=1. 相似文献
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StudiesontheReactivitiesofUndecatungstogallatesK_n[GaW_(11)O_(39)M(H_2O)]·xH_2O(M=Mn,Co,Ni,Cu,Cr,FeorZn)LIUJing-fu,ZHANXiao-p... 相似文献
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Exciton coupling may arise when chromophores are brought into close spatial proximity. Herein the intra‐nanocrystal exciton coupling of the surface complexes formed by coordination of 8‐hydroxyquinoline to ZnS nanocrystals (NCs) is reported. It is studied by absorption, photoluminescence (PL), PL excitation (PLE), and PL lifetime measurements. The exciton coupling of the surface complexes tunes the PL color and broadens the absorption and PLE windows of the NCs, and thus is a potential strategy for improving the light‐harvesting efficiency of NC solar cells and photocatalysts. 相似文献
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In this paper we report on our study of the surface chemical composition, surface energy and acid-base characteristics of plantation eucalypt pulps obtained using the kraft, neutral sulphite semichemical (NSSC) and cold soda processes. X-ray photoelectron spectroscopy (XPS) was used to quantify the surface coverages of extractives and lignin. Inverse gas chromatography (IGC) was used to analyse the dispersive component and the acid-base characteristics of the pulp samples. The pulp yield and the total lignin and extractives in the pulp increased in the sequences of kraft, NSSC and cold soda. The relative surface concentrations of extractives and lignin on the pulps (expressed in terms of the ratios of the pulp surface coverage to the total content of these materials in the pulp) did not increase in the same sequence. The relative surface concentrations of lignin and extractives on the kraft pulps were found to be distinctively higher than those of the NSSC and cold soda pulps. The dispersive components of the surface energy of all pulps were similar before extraction, but increased by different degrees after extraction, with that of the cold soda pulp showing the lowest degree of increase. The acid-base characteristics of the pulps were evaluated using the method of acceptor and donor constants described by Schultz and Lavielle and the method of work of adhesion described by Lundqvist and Ödberg. A comparison of these methods has been made. The acidity of all pulps was found to increase after extraction. The degree of increase in pulp acidity is negatively correlated with the surface lignin concentration on the pulps. The low relative acidity of the cold soda pulp is probably associated with its high surface lignin coverage. An experimental model was established to test this hypothesis. 相似文献
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Pt/CdS光催化剂表面修饰和表面结构 总被引:1,自引:0,他引:1
Pt/CdS光催化剂表面修饰和表面结构张虎勤陈开勋*金振声(西北大学化工系西安710069)(中国科学院兰州化学物理研究所兰州)关键词光催化剂,半导体,表面组成,表面修饰1996-05-20收稿,1996-09-28修回近年来对在Pt/CdS催化剂上... 相似文献
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应用表面光电压谱研究固体表面酸度 总被引:1,自引:0,他引:1
测量与亚带隙辐射相关的表面光电压谱可极其灵敏地得到固体表面态信息。固体表面酸与受体表面态相关。本文用近红外光辐射测试了分子筛和杂多酸的表面光电压,观察到在900~1500 nm光谱区有表面光电压响应。不同的峰位对应不同受体表面态位置,代表不同酸的强度;峰强度对应态密度,反映了酸总量。对初步结果也进行了理论分析。 相似文献
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Surface plasmon resonance 总被引:1,自引:0,他引:1
Pattnaik P 《Applied biochemistry and biotechnology》2005,126(2):79-92
During last decade there has been significant progress in the development of analytical techniques for evaluation of receptor-ligand
iteraction. Surface plasmon resonance (SPR)-based optical biosensors are now being used extensively to defined the kinetics
of wide variety of macromolecular interactions and high- and low-affinity small molecule interactions. The experimental design
data analysis methods are evolving along with widespread applications in ligand fishing, microbiology, virology, host-pathogen
interaction, epitope mapping and protein-, cell-, membrane-, nucleic acid-protein interactions. SPR based biosensors have
strong impact on basic and applied research significantly. This brief review describes the SPR technology and few of its applications
in relation to receptor-ligand interaction that has brought significant change in the methodology, analysis, interpretation,
and application of the SPR technology. 相似文献