Study on the Films Forming Process of Nanosized SnO2 Colloid Particles at the Gas-Liquid Interface

The hydrosol of SnO2 nanoparticles are prepared by the method of colloid chemistry. The free piling up process of nanosized SnO2 colloid particles are investigated at the gas-liquid interface by LB and Brewster Angle Microscopy techniques. The result indicates that solid state monolayer and multilayer of SnO2 nanoparticles can be formed at the gas-liquid interface only by aging the sol in air or compressing it without amphiphiles surfactant.

SnO_2水溶胶气-液界面纳米胶粒成膜过程

采用胶体化学法制得稳定的SnO_2纳米粒子水溶胶．在LB膜槽内，用膜天平考察了溶胶在陈化和匀速压缩过程中，气—液界面表面压力的变化情况，并用布儒斯特角显微镜（BAM），直接观察了陈化过程中界面胶体粒子的自由密堆积成膜过程，和匀速压缩过程中界面胶体粒子的压缩成膜过程，结果发现，新制（或刮净后）的溶胶表面处于亚稳态，而久置的溶胶表面处于稳定状态，并且溶胶气—液界面的纳米波粒，可通过陈化和压缩，密堆积成固态和类固态膜.

双亲性含硫和含氮化合物有序单分子膜对碳钢的缓蚀作用

应用超分子组装技术将含硫和含氮的双亲性金属缓蚀剂有序单分子膜按设计方式修饰在碳钢表面。探讨了在有序的单分子膜内缓蚀剂分子的排列对碳钢在硫酸中腐蚀的抑制作用，深入讨论了缓蚀剂单分子膜对碳钢腐蚀过程的抑制机理。研究发现：在单分子膜中，水合氢离子传递的离子通道强烈地依赖于缓蚀剂分子的排列方式。

MECHANISM OF IRON INHIBITION BY STEARIC-ACID LANGMUIR-BLODGETT MONOLAYERS

Using the Langmuir-Blodgett (LB) technique, stearic acid (SA) monolayers were deposited onto the surface of an iron (Fe) electrode to study the inhibition effect and the mechanism of SA in a neutral medium. Molecular orientation and the number of deposited monolayers of SA were shown to have marked effects on inhibition of Fe corrosion. The inhibition mechanism depended mainly on blocking.

电化学石英晶体微天平及其应用

本文介绍了EQCM的原理及其应用,探讨了EQCM在生物大分子,纳米技术方面的应用,详细介绍了EQCM在气味检测、金属电沉积、药物分析等方面研究的优点和EQCM的发展前景.

稀土（Nd，Pr）（Ⅲ）双酞菁衍生物的合成、表征和气敏特性

合成了八－４－（四氢糠氧基）酞菁钕（Ⅲ）（Ａ）、八－４－（β－萘氧基）酞菁钕（Ⅲ）（Ｂ）、八－４－（２，４－二叔戊基苯氧基）酞菁钕（Ⅲ）（Ｃ）和八－４－（２，４－二叔戊基苯氧基）酞菁镨（Ⅲ）（Ｄ）４种新的稀土（Ｎｄ、Ｐｒ）（Ⅲ）双酞菁衍生物，经元素分析、红外光谱、核磁共振谱表征．紫外可见光谱表明，它们在氯仿（１０￣（－６）ｍｏｌ／Ｌ）溶液中以单分子形式存在．热重分析证明配合物的热稳定性：Ｂ＞Ｃ～Ｄ＞Ａ．４种配合物成膜性好，Ｚ型沉积形成的单层ＬＢ膜材料对氨气有响应，特别是八－４－（四氢糠氧基）酞菁钕（Ⅲ）的膜材料对氨气很敏感，可与铜酞菁ＬＢ膜气敏性相比．

INHIBITION OF CORROSION BY HEXADECYL TRIMETHYL AMMONIUM BROMIDE LANGMUIR-BLODGETT MONOLAYERS ON CARBON-STEEL

Langmuir-Blodgett (LB) monolayers of hexadecyl trimethyl ammonium bromide (HTAB) were deposited onto a carbon steel surface to investigate the inhibition of corrosion by measurement of the polarization resistance and cyclic voltammetry. The corrosion proc

酞菁铜(Ⅱ)衍生物的合成及其成膜性

合成了四-4-(8-喹啉氧基)酞菁铜(Ⅱ)等6种新型酞菁铜衍生物,通过元素分析、红外光谱、顺磁共振、质谱及核磁共振谱加以确认.紫外可见光谱表明它们在氯仿溶液(10~(-5)mol/L)中主要以单分子形式存在,配合物的氯仿溶液在亚相(水)上的π-A曲线表明,它们均有明显的“气-液-固”变化过程,具有良好的形成LB膜性质.

十六烷基三辛基铵静电吸附氯金酸的Langmiur-Blodgett膜及其修饰聚氯乙烯液膜金离子选择性电极的研究

首次尝试用Langmiur-Blodgett(LB)技术修饰PVC液膜离子选择性电极,在PVC液膜表面上制得十六烷基三辛基铵-氯金酸LB膜,明显改善了PVC液膜金离子选择性电极的某些工作性能。电极线性响应范围为1×10~(-2)～1×10~(-7)mol/L,对常见的9种阳离子和4种阴离子的干扰能力明显的增强,响应速度也有所提高。若能改进挂膜方式,可望进一步改善有关性能。

DETERMINATION OF THE MOLECULAR-ORIENTATION OF A PHTHALOCYANINE DERIVATIVE IN A LANGMUIR-BLODGETT-FILM BY POLARIZED UV VIS SPECTRA

Langmuir-Blodgett (LB) films of (p-carboxyphenoxy)-tri(2,4-di-tert-pentyl phenoxy)phthalocyanine copper(II) (asyCuPc) are prepared; the associated forms of the compound in chloroform solution and the particular orientation of asyCuPc molecular macrocycles in LB films is determined by polarized UV-VIS.

THE CHARACTERIZATION OF 2 COPPER PHTHALOCYANINE LANGMUIR-BLODGETT-FILMS AND THEIR GAS-SENSITIVE PROPERTIES

The monolayer and deposition behaviour of a symmetrically substituted copper tetra-4-(2, 4-di-t-amylphenoxy) phthalocyanine (tapCuPc) and an asymmetrically substituted copper [tri-4-(2, 4-di-t-amylphenoxy)-mono-4-(-2-methoxyethoxy)]phthalocyanine (AsyCuPc) were investigated. The results on monolayer behaviour and spectroscopic characterization of the LB films show that both CuPc molecules in a monolayer at the air-water interface and the LB films are stacked and inclined. The gas-sensitive properties show that the responding speed of AsyCuPc LB film is faster than that of tapCuPc LB film.

ELECTROCHEMICAL-BEHAVIOR OF N-METHYL-N'-HEXADECYLVIOLOGEN MONOLAYERS ON SILVER ELECTRODES - EFFECTS OF COUNTERIONS

N-Methyl-N'-hexadecylviologen (C16MV) has been the subject of several electrochemical and spectroelectrochemical studies which characterized the species present in various redox states for C16MV monolayers on silver electrode surfaces. Both self-assembled monolayers (SA) and Langmuir-Blodgett (LB) transferred systems have been studied. These indicated inconsistencies regarding the presence or absence of splitting of the first reduction peak in its cyclic voltammogram (CV). The present study demonstrates the important influence of the specific anionic species present in the supporting electrolyte. Splitting may or may not take place, depending on the size and relative strength of the adsorption of specific anions contributed by the supporting electrolyte. Small, strongly adsorbing anions such as iodide produced peak splitting in the CV of C16MV monolayers; bulky but weakly adsorbing anions such as perchlorate may disrupt the ordered structure of monolayers but produce no splitting. Ancillary data provided by surface enhanced Raman spectroscopy (SERS) was consistent with the electrochemical measurements.

MONOLAYER FORMATION OF A NOVEL AMPHIPHILIC POLYMER PAMC16S

Poly(2-acrylamido-hexadecylsulfonic acid) (PAMC16S) forms a stable monolayer on a pure water surface. More closely packed monolayers can be obtained when the subphase contains Cd2+ or Ca2+. Self-assembled monolayers have been formed on gold surfaces and characterized by contact angle measurement, XPS and electrochemical analysis. The results show that the monolayers are hydrophobic with the hydrophilic sulfonic acid groups adjacent to the metal surfaces and with the hydrocarbon chains extended from the surfaces. The monolayers exhibit great adsorption stability during the faradaic reactions, illustrating the advantage of polymeric LB films in potential applications.

多层单分子膜厚度的测定

本工作介绍一种应用透射电子显微镜测定单分子膜厚度的简便方法,用这种方法可以测定出厚度在几纳米至几十纳米的单分子膜,为研究单分子膜的分子排列及其结构提供了有用的参考数据。

一种具有“浮萍”结构的单分子膜与Langmuir-Blodgett多层膜

本文以St-DVB微凝胶/甲基丙烯酸两性接枝共聚物制成了一种新型“浮萍”结构的单分子膜,并转移制备了LB多层膜,对其单分子膜的性质、LB多层膜的二维有序结构及膜的热稳定性进行了较深入的研究。