Phase Transitions and Domain Structures in Monolayers

单分子层中的相变和域结构

• 批准号: 9408584
• 负责人: Charles Knobler
• 金额: $ 49.9万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-06-01 至 1997-11-03
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9408584&HistoricalAwards=false
• 关键词: Phase; Transitions; Domain; Structures; Monolayers

Professor Knobler is supported by a grant from the Theoretical and Computational Chemistry Program to continue his studies of Langmuir monolayers of amphiphiles. He is examining long range order in self organizing monlayers, and the phase transitions which occur in these two dimensional assemblies. Fluorescence microscopy and Brewster angle microscopy are used to distinguish the optical textures corresponding to different molecular orientations. The experimental results are compared with a mean-field theory of these textures which has been developed. These methods will also be employed to examine the structures and kinetics of growth of mosaic textures that are characteristic of certain condensed monolayer phases. Langmuir monolayers are films of a single molecular layer that can be formed at the interface between air and water. They are composed of amphiphilic moleucles such as long chain fatty acids, esters and alcohols. Such films provide an opportunity to study two-dimensional systems, and they provide structural insights into biochemical systems such as lipid bilayers. These monolayers can be transferred as Langmuir-Blodgett films to solid supports, and may be employed as sensors, and as electronic devices.

Knobler教授得到了理论和计算化学项目的资助，继续他对两亲分子朗缪尔单层的研究。他正在研究自组织层中的长范围有序，以及发生在这些二维组合中的相变。利用荧光显微镜和布鲁斯特角显微镜来区分不同分子取向对应的光学织构。实验结果与已建立的织构平均场理论进行了比较。这些方法还将用于研究具有某些凝聚单层相特征的马赛克织构的结构和生长动力学。朗缪尔单层膜是可以在空气和水之间的界面上形成的单分子层薄膜。它们由两亲性分子组成，如长链脂肪酸、酯类和醇类。这样的薄膜提供了一个研究二维系统的机会，它们提供了对生物化学系统（如脂质双分子层）的结构见解。这些单层膜可以作为Langmuir-Blodgett薄膜转移到固体支架上，并且可以用作传感器和电子设备。