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一种新型有序超薄有机膜—自组膜 总被引:8,自引:0,他引:8
本文比较全面地综述了目前国际上研究比较热门的课题,一种新型有序超薄有机膜-自组膜。首先比较了自组膜和LB膜,主要从膜的特征和分类,膜的结构、表征技术等方面对自组膜的研究进行了综述。着重阐述了最有代表性的硫醇在金上的单分子层自组膜。 相似文献
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有机液体优先透过渗透汽化膜及其过程 总被引:10,自引:0,他引:10
本文回顾了近0年来有机液体优先透过渗透汽化膜的研究与发展状况。包括各种欲分离体系及膜材料的选择、膜的渗透汽化特征表征、影响膜分离性能的各种因素,以及近年来有机液体优先透过PV膜的一些研究成果。 相似文献
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采用溶胶-凝胶法制备了多孔氧化铝膜,并通过DSC、TGA、SEM、N_2吸附和气体透过率测定等手段,对膜的性能进行了表征.结果表明,用这种方法制备的多孔氧化铝膜是一种均匀无裂痕和具有较窄孔径分布(约4nm)的膜材料.将此多孔氧化铝膜制成膜反应器后,用于甲醇催化脱氢制甲醛的反应,发现甲醇转化率比常规反应器有较大幅度的提高.同时首次尝试采用溶胶-凝胶法将催化活性组分直接负载到多孔氧化铝膜上,从而得到了一种具有催化活性的多孔膜,并考察了它的反应活性.文中对由这两种多孔膜及钯/陶瓷复合膜制成的反应器的特点进行了比较. 相似文献
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亲水膜的表面改性及在膜蒸馏中的应用 总被引:4,自引:0,他引:4
膜的微孔性和疏水性是水溶液膜蒸馏的两个基本条件,迄今人们均采用疏水性高分子材料制成疏水微孔膜用于膜蒸馏研究。本文采用辐照接枝聚合和等离子体表面聚合的方法,将亲水的醋酸纤维素微孔膜和硝酸纤维素微孔膜表面疏水化改性,成功地用于膜蒸馏研究,大大扩展了疏水微孔膜的材料来源。实验结果表明,亲水膜表面改性得到的疏水膜,其膜蒸馏性能不低于疏水材料制成的膜,尤其是等离子体聚合法可以实现多种特殊单体在多孔的材料表面聚合,成为制备高性能疏水微孔膜的有效手段,为膜蒸馏的深入发展和实用化创造了有利条件。 相似文献
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膜材料作为新材料“十三五”规划专项工程之一,在工业和日常生活中起着非常重要的作用。依据材质不同,介绍了现有常见的有机膜、无机膜、新型膜材料,阐述了近年来膜在水处理、气体分离、电池隔膜和燃料电池等方面的应用发展,说明了膜材料在疫情防护材料中的用途,并对膜材料未来的发展做了总结和展望。 相似文献
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Ke Qiang DING Zhen Bin JIA Qing Fei WANG Juan BAI Ru Ting TONG Xin Kui WANG Hui Bo SHAO* Institute of Coal Chemistry Chinese Academy of Science Taiyuan Department of Chemistry Hebei Teachers University Shijiazhuang D 《中国化学快报》2002,13(4)
Recently, the adsorption behavior of protein on solid substrate has attracted much attention for the reason that adsorption on a substrate is the first key step for other further electrochemical investigation1. Meanwhile the free adsorption could provide a relative well-ordered structure, with which some fundamental study could be carried out conveniently2. As we know, the electrochemical impedance spectroscopy (EIS) method has become one of the powerful techniques to detect the change of i… 相似文献
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硫醇在金电极上的SA单分子层膜的电化学研究 总被引:14,自引:0,他引:14
金基底上的硫醇自组装单分子层膜(Self-asembledmonolayers,SAMs)具有良好的稳定性和有序性,因此在基础研究及应用技术等领域都受到了广泛的重视[1].通过电化学方法测定自组装膜对溶液中电活性物质的异向电子转移的阻碍作用. 相似文献
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Cyclic voltammetry and electrochemical impedance spec-troscopy were used to study the surface acid-base property of carboxylic acid-terminated self-assembled monolayers(SAMs).A carboxylic acid-terminated thiol,such as thioctic acid(1,2-dithiolane-3-pentanoic acid),was self-assembled on gold electrodes.Electron transfer between the bulk solution and the SAM modified electrode was studied at different pH using Fe(CN)63-as a probe.The surface pka of thioctic acid was determined by cyclic voltammetry and electrochemical impedance spectroscopy to be 5.6 ±0.1 and 5.8±0.1,respectively.The method is compared with other methods of monolayer pKa measurement. 相似文献
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Keqiang Dmg Qingfei Wang Zhenbm Jia Na Tian Ning Wang Ruting Tong Xinkui Wang Huibo Shao 《中国化学会会志》2002,49(2):185-190
In this paper, Schiffbases were investigated using cyclic voltammetry (CV) and impedance electrochemical spectroscopy (EIS) techniques by means of self‐assembled monolayers for the first time, where a 0.1 M KCl solution and the redox couple of Fe(CN)63?/Fe(CN)64?were used as the electrolyte and probing‐pin, respectively. The monolayers formed by the employed Schiff base were proved to be relatively stable, and its electrochemical response in the studied system with different pH values was also de scribed clearly with CV and EIS plots. The results show that the monolayer of Schiff bases could exist in the solution with pH value from 2 to 10. In the EIS measurement in the concentration range from 10?5 M to 5× 10?4 M, a nearly linear relation ship between the charge transfer resistance (Rct) and the logarithm concentration of Cu2+was observed, suggesting that Cu2+ could be titrated with the EIS method quasi‐quantitatively. The phenomenon agreed with the former report very well. Using the self‐assembled monolayers to study Schiff bases with the electrochemical method is the major contribution of our work. 相似文献
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《Electroanalysis》2004,16(3):242-246
Industrial waste cinder (CFe*) has been utilized as a stable anchoring matrix for self‐assembling of Fe(CN)63? as hybrid Prussian blue units (PB, *Fe3+FeII(CN)6) on a screen‐printed carbon electrode (SPE) for efficient catalytic applications. The waste cinder was found to be a composite of calcium and iron silicates similar to glass matrix by X‐ray photoelectron spectroscopic (XPS) study. The hybrid PB formations were confirmed by both FT‐IR and electrochemical methods. Most importantly, the free iron (Fe*) ion bound to the non‐bridging oxygen terminals of the silicates was found to play a key role in the PB formation. The self‐assembled PB hybrid on the cinder‐modified screen‐printed electrodes (designated as PBCFe*‐SPE) improved linear detection range and sensitivity for H2O2 mediated oxidation than those obtained at a classical PB‐SPE in 0.1 M, pH 2 KCl/HCl base electrolyte at 0.0 V (vs. Ag/AgCl) by amperometric batch analysis. 相似文献
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Noboru Oyama Takeo Ohsaka Takeyoshi Okajima Tomoaki Hirokawa Tsuyoshi Maruyama Yukio Ohnuki 《Journal of Electroanalytical Chemistry》1985,187(1):79-96
Liquid crystalline/polymer composite membrane-coated electrodes were prepared by casting a 1,2-dichloroethane solution of N-(4-ethoxybenzylidene)-4′-n-butylaniline (EBBA) and polycarbonate (PC) on an electrode surface. The temperature-dependence of the permeability of the EBBA/PC composite membrane on electrodes to Fe(CN)3?6 ion as a solution-phase redox ion was investigated by means of hydrodynamic voltammetry at a rotating disk electrode. The permeability changed with temperature over the range of the crystalline-nematic-phase transition temperature of EBBA. It is demonstrated that the observed temperature-dependence of the permeability reflects the thermotropic properties of EBBA in the EBBA/PC composite membrane. Furthermore, the dependence of the limiting current of the steady-state current-potential curves for the reduction of Fe(CN)—6 at the EBBA/PC composite membrane-coated electrode upon the membrane thickness, the blend ratio of EBBA and PC and the concentration of Fe(CN)3?6 in a bulk solution was examined in order to understand the transport process of Fe(CN)?36 through the EBBA/PC composite membrane from the membrane/solution interface to the electrode/membrane interface. The transport process of Fe(CN)3?6 within the membrane was found to obey Fick's Law. 相似文献
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Self‐Assembly Mechanism of Nanoparticles of Ni‐Based Prussian Blue Analogues at the Air/Liquid Interface: A Synchrotron X‐ray Reflectivity Study 下载免费PDF全文
Dr. Juan J. Giner‐Casares Dr. Miguel Clemente‐León Prof. Dr. Eugenio Coronado Prof. Dr. Gerald Brezesinski 《Chemphyschem》2015,16(12):2549-2555
Prussian Blue analogue (PBA) nanoparticles can be self‐assembled at air/liquid interfaces to build novel materials with interesting magnetic features. Herein, we study the influence of the size of PBA Cs0.4Ni[Cr(CN)6]0.9 and K0.25Ni[Fe(CN)6]0.75 nanoparticles on the self‐assembly behavior by synchrotron X‐ray reflectivity. Both nanoparticles show similar Z‐potential values. The phospholipid dipalmitoylphosphatidylcholine and the amino surfactant dimethyldioctadecylammonium have been used as Langmuir monolayers to anchor the PBA nanoparticles and study the interplay of forces directing the self‐assembly of the nanoparticles at the surfactant/liquid interface. Whereas Cs0.4Ni[Cr(CN)6]0.9 nanoparticles with a diameter of 8 nm form an incomplete layer at the surfactant/water interface, the larger K0.25Ni[Fe(CN)6]0.75 nanoparticles with a diameter of 20 nm generate complete layers that can be stacked to one another. The size of the PBA nanoparticles is the main parameter determining the final arrangement at the air/liquid interface, due to the different extent of interparticle interaction. This study aims at the rationale design of PBA nanoparticles for an effective interfacial self‐assembly, ultimately leading to functional materials. 相似文献
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In the presence of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride(EDC)and N-hydroxysuccinimide(NHS), carboxylic group-functionalized single-walled carbon nanotubes(SWNTs)were assembled vertically on the glassy carbon electrode using ethylenediamine as linking agent to fabricate an aligned electrode(SWNTE).The morphological characteristic was studied with atomic force microscope(AFM)and its electrochemical property was investigated using K_3[Fe(CN)_6]as probe. ssDNA had a sensitive voltammetr... 相似文献
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《Electroanalysis》2005,17(1):59-64
Single‐wall carbon nanotubes (SWNTs) sub‐monolayer film has been prepared by simply electrostatically adsorbing nanotubes onto a 2‐aminoethanethiol self‐assembled monolayer (SAM) on a gold bead electrode. Tapping‐mode atomic force microscopy (TM‐AFM) is used to characterize the SWNT film, which exhibits that the orientation of SWNTs on the SAM is horizontal and the surface coverage is quite low. The SWNTs modified electrode shows nearly ideal electrochemical response to Fe(CN) /Fe(CN) redox probe. The electrode with such a low SWNTs coverage, however, shows good electrocatalytic behavior to cytochrome c. 相似文献