Molecular level structure analysis of Gibbs film stabilized by interaction between mesoscopic domains

通过介观域之间的相互作用稳定吉布斯薄膜的分子水平结构分析

基本信息

批准号：
16550017
负责人：
TAKIUE Takanori
金额：
$ 2.3万
依托单位：
KYUSHU UNIVERCITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

Recent development of spectroscopic technique enables us to analyze the structure of interfacial films at gas/liquid interfaces from molecular level. However, the structure analysis of interfacial films at liquid/liquid interfaces has not been well organized yet, although it gives fundamental information about the structure and property of molecular organized systems such as microemulsion, vesicles, biomembranes, and so on. This study aim at elucidating the relationship between function and structure in biological system on the basis of structure analysis of Gibbs films at liquid/liquid interfaces.During the research for three years, the Gibbs films of fluorocarbon (FC) and hydrocarbon (HC) alcohols at the hexane/water interface was examined by interfacial tension and synchrotron X-ray reflectivity measurements. The noticeable results obtained are as follows.1. Interfacial tension studyThe interfacial tensions of the hexane solution of solutes against water were measured as a function … More of temperature, pressure, and concentration. The experimental data was analyzed in terms of rigorous thermodynamics of interfaces to obtain interfacial density, entropy and volume of adsorption, phase diagram of adsorption, and excess thermodynamic quantities of adsorption.(1) The adsorbed FC alcohol films exhibit phase transition between gaseous (or expanded) and condensed states.(2) FC alcohols mix with HC alcohol in the expanded film, while are immiscible in the condensed film because of very weak mutual interaction between FC and HC chains.(3) FC alcohols become to be miscible with cationic surfactant with HC chain (DTAB) due to strong attractive interaction of hydroxyl group with cationic head group.(4) In the mixed system of FC alcohol-DTAB, Gibbs film form multilayer spontaneously.2. X-ray reflectivity studyIn order to determine the structure of Gibbs films found in the interfacial tension study, the X-ray reflectivity measurements were performed at BL-X19C in NSLS of Brookhaven National Laboratory (USA) as a function of temperature at fixed concentration. The results obtained were ;(1) FC and HC alcohols are closely packed in the condensed film like two-dimensional solid state.(2) The Gibbs films are inhomogeneous by coexisting condensed phase domains with very low density gaseous film near phase transition temperature.(3) The total reflectivity in the condensed film is lower for FC alcohol-DTAB system is lower than for the condensed films of single FC alcohol systems. This suggests the mixing of FC alcohol and DTAB in the condensed state.(4) The oscillation of reflectivity curve supports the multilayer formation in the FC alcohol-DTAB system. Less

光谱技术的最新发展使我们能够分析来自分子水平的气/液体界面处的界面膜的结构。然而，尽管液体/液体界面上的界面膜的结构分析尚未井井有条，尽管它提供了有关分子有组织系统的结构和特性的基本信息，例如微乳液，蔬菜，生物膜，等等。这项研究的目的是根据液体/液体界面的吉布斯膜的结构分析来阐明生物系统中的功能与结构之间的关系。在三年的研究中，通过乙烷/水界面的含氟化合物（FC）（FC）（FC）（FC）（HC）酒精的Gibbs膜通过乙烷/水接口进行了素间质量张力和同步X-Ray X-Ray x-Ray x-Ray consectivient。获得的明显结果如下1。界面张力研究溶液对水的己烷溶液的界面张力是作为一种功能来测量的……更多的温度，压力和浓度。 The experimental data was analyzed in terms of rigorous thermodynamics of interfaces to obtain interfacial density, entropy and volume of addorption, phase diagram of addorption, and excess thermodynamic quantities of addorption.(1) The adsorbed FC albumhol films exposed phase transition between gaseous (or expanded) and condensed states.(2) FC alcohols mix with HC alcohol in the expanded film, while are immiscible （3）FC酒精在凝结膜中的相互作用非常微弱。（3）由于羟基与阳离子链与阳离子链与阳离子链的有吸引力的相互作用与阳离子链与阳离子链与阳离子链与阳离子头组的有吸引力的相互作用，FC醇可与阳离子表面活性剂无关。 X射线反射率研究的顺序为确定界面张力研究中发现的Gibbs膜的结构，X射线反射率测量是在BL-X19C在布鲁克黑文国家实验室（USA）NSLS的BL-X19C上作为固定浓度下温度的函数进行的。所获得的结果为;（1）FC和HC醇像二维固态一样紧密包装在凝聚的膜中。（2）通过在缩写膜中，与缩短的摄像机相比，吉布斯膜通过与非常低密度的气体近相变温度的凝结膜相比，吉布斯膜不均匀。这表明将FC醇和DTAB在冷凝状态中混合。（4）反射率曲线的振荡支持FC酒精-DTAB系统中的多层形成。较少的