共查询到20条相似文献,搜索用时 46 毫秒
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功能性超薄有序分子沉积膜的制备及其结构研究 总被引:14,自引:4,他引:14
1991年G.Decher等首次探讨了阴阳离子与聚电解质交替沉积制备有机超薄膜的方法。我们在完善成膜技术和发展成膜基质的基础上,详细研究了其成膜过程与膜的结构,并定义这种新的自组装超薄有序膜为分子沉积膜——MD膜。MD膜是利用阴阳离子的静电吸附反应特性,通过相反离子体系的交替分子沉积制备的层状有序自组装多层超薄膜。需要指出的是,分子沉积既是有机超薄膜的制备技术,本身又是一种自组装超薄有序膜。MD膜制备工艺简单,热稳定性和长期稳定性好,不受基体形状与面积限制。 相似文献
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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-无机杂化膜的研究进展 总被引:15,自引:0,他引:15
有机-无机杂化膜由于具备了无机膜和有机膜各自的特点,具有良好的分离特性和物化稳定性,因而成为当前膜技术领域新型膜材料研究的热点.本文主要介绍了近年来国内外有机-无机杂化膜的研究现状、杂化膜的制备方法、结构和应用. 相似文献
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无机膜反应器中丁烷脱氢的研究 总被引:1,自引:0,他引:1
无机膜反应器中丁烷脱氢的研究吴泽彪杨惟慎房廉清刘杰刘世河林励吾(中国科学院大连化学物理研究所,大连116023)关键词无机膜,膜反应器,丁烷,脱氢丁烷脱氢制丁烯是一个热力学控制反应,为了获得较高的产率,必须在高温下进行反应。但高温导致副反应,使... 相似文献
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负载型SiO2无机膜的制备与表征 总被引:1,自引:0,他引:1
采用Sol-Gel法制备负载型SiO_2无机膜,考察了有机粘结剂、处理温度对膜性能和结构的影响,并用SEM、XRD、孔分布和渗透性测定等方法对无机膜进行了表征。 相似文献
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CdS纳米微粒在LB膜层隙聚集形态的AFM观察 总被引:2,自引:0,他引:2
用LB技术制备纳米微粒与超薄有机膜的复合膜是近年来值得注意的研究进展*.利用该方法所制备出的材料既具有纳米粒子所特有的量子尺度效应,又具有LB股的分子层次有序、股厚可控以及易于组装等特点.它可用来制备结构可控的有机无机交替膜.而且,通过改变LB膜成膜材料和制备条件还可改变纳米粒子的光电特性.因此它在微电子学、光电子学、非线性光学及传感器等研究领域有着十分广阔的应用前景问.纳米微粒的聚集形态及LB膜在生成纳米微粒后的结构变化对材料的特性有着很大的影响.但采用一般的电镜技术或光谱分析手段均不能在实空间和… 相似文献
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Ferroelectric Films 总被引:1,自引:0,他引:1
Uhlmann D.R. Dawley J.T. Poisl W.H. Zelinski B.J.J. Teowee G. 《Journal of Sol-Gel Science and Technology》2000,19(1-3):53-64
The preparation and properties of ferroelectric films are reviewed. Specific attention is directed to ferroelectric films prepared by wet chemical methods. Emphasis is placed on the microstructure and properties of SBT films for memory applications, and their dependence on chemistry and processing, as well as on the effects of chemistry and processing on the properties of piezoelectric and pyroelectric films. Emphasis is placed on recent results obtained in our laboratories, including modeling of the ferroelectric behavior of films and experimental results in each of these areas. Also considered is the use of ferroelectric films in memory, piezoelectric and pyroelectric devices of various types, with specific note made of the recently-announced use of pyroelectric sensors in automobiles. 相似文献
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由聚电解质自组装多层膜制备微孔薄膜 总被引:1,自引:0,他引:1
带有相反电荷的聚电解质通过静电作用交替沉积可以得到自组装多层膜,由于这种技术可操作性强,用途广泛,近十几年来已有了大量的研究.聚电解质多层膜在一定条件下可以形成纳米孔和微米孔.Fu等研究了聚丙烯酸和聚乙烯基吡啶组成的氢键自组装多层膜在碱溶液中溶去其中的聚丙烯酸后,剩下的聚乙烯基吡啶重构形成微孔薄膜.Mendelsohn等发现将聚丙烯酸和聚烯丙基胺自组装而成的多层膜浸入pH=2.4左右的溶液中可制备微孔薄膜.但这些方法并不能使强聚电解质多层膜形成多孔结构。 相似文献
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Huiming Cheng 《物理化学学报》2020,36(2):1909042-0
正石墨烯具有优异的电学、光学、热学和力学等性质,在学术界和工业界都受到极大的关注和重视。众所周知,制备决定材料的未来。化学气相沉积方法(Chemical Vapor Deposition,CVD)是目前制备大面积、高质量石墨烯薄膜的最佳选择~(1,2)。近年来,针对石墨烯薄膜缺陷浓度、畴区尺寸、堆垛方式、层数、掺杂浓度等的精确控制均取得了一系列进展~(3–5)。然而,CVD制备石墨烯过程中的污染问 相似文献
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单向拉伸聚酰亚胺薄膜 总被引:1,自引:0,他引:1
分别以聚酰胺酸法和部分酰亚胺化的“凝胶法”研究了均苯二酐/二苯醚二胺(PMDA/ODA)和联苯二酐/对苯二胺(BPDA/PPD)体系聚酰亚胺薄膜在制膜过程中对单向拉伸比的影响,研究了薄膜在热膨胀系数和力学性能方面的差别。结果表明,“凝胶法”薄膜可以有较高的拉伸比,可以使薄膜有较低的热膨胀系数(对于PMDA/ODA,由35.1×10-6/℃降低到12.5×10-6/℃),可以明显提高拉伸方向的强度和模量,PMDA/ODA可以分别达到236MPa和1.7GPa;BPDA/PPD可以分别达到613MPa和9.3GPa,但伸长率有所降低。 相似文献
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N. Hüsing B. Launay G. Kickelbick F. Hofer 《Journal of Sol-Gel Science and Technology》2003,26(1-3):615-619
Mesostructured silica-titania mixed oxide films in which the titania is well accessible on the silicate pore wall have been synthesized by a ligand-assisted templating (LAT) approach in combination with sol-gel processing. Control over the different hydrolysis and condensation rates of silicon and titanium alkoxides was achieved by complexation of the titanium species to the poly(ethylene oxide) part of an amphiphilic surfactant molecule (Brij56®). This modified precursor was used as structure-directing agent in the formation of thin mesostructured films. The structure and composition of the resulting material was characterized by X-ray diffraction, UV-vis spectroscopy and transmission electron microscopy. 相似文献
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M. Drabik A. M. Zachary Y. Choi J. Hanus J. Tousek J. Touskova V. Cimrova D. Slavinska H. Biederman L. Hanley 《Macromolecular Symposia》2008,268(1):57-60
Summary: Titanyl phthalocyanine (TiOPc) thin films were prepared using evaporation and surface polymerization by ion-assisted deposition (SPIAD) in a vacuum deposition system. These films were characterized by means of ultraviolet and X-ray photoelectron spectroscopy as well as UV/Vis absorption spectroscopy. Valence band and elemental content indicated that phthalocyanine electronic and chemical structures were largely preserved during SPIAD. Further, bilayer thin films of titania (TiO2) and SPIAD TiOPc were prepared. TiO2 film was deposited by reactive magnetron sputtering of TiO2 target. Study of the structured samples was focused on the optical and electrical properties of the composite films. The films were characterized by non-contact photovoltage measurements and UV-Vis spectroscopy. These results suggest there is a possibility to use these bilayer thin films in photovoltaic solar cells, however further experiments to improve conductivity of the films will be required. 相似文献