CAREER: Polymer Langmuir Monolayers: Boundaries, Dynamics and Thermodynamics

职业：聚合物朗缪尔单层膜：边界、动力学和热力学

• 批准号: 9984304
• 负责人: Elizabeth Mann
• 金额: $ 35万
• 依托单位: Kent State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-03-01 至 2005-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9984304&HistoricalAwards=false
• 关键词: CAREER; Polymer; Langmuir; Monolayers; Boundaries

The aim of this project is to investigate the boundary tension and surface viscosity of Langmuir films at the air/water interface, and to determine how to control the structure and dynamic response of Langmuir monolayers. When molecules align at a surface, symmetry is broken leading to long -range electrostatic repulsion between surface molecules. Movement within the monolayer is coupled to the substrate. The combination of hydrodynamics and electrostatics leads to long lived metastable states within the film. The formation of these states, and the relaxation from them, determines the structure and dynamics of biomembranes and are crucial in making Langmuir-Blodgett films. This project will focus on the rheology of isolated islands of dense, phase-separated polymers as monolayer films. The boundary tension will be determined as a function of various parameters such as temperature and molecular weight, and the results compared with theoretical and numerical results. With copolymers, the influence of liquid crystal side chains in increasing fractions on the boundary energy and structure will be explored. A major educational goal is to attract and train a diverse group of students at every educational level, and to encourage interdisciplinary collaborations in addressing the fundamental science of technologically important questions.%%%Langmuir films consisting of molecules self-confined at a fluid surface serve as model quasi-two dimensional systems of technologically and biologically important systems such as foams, emulsions, Langmuir-Blodgett multilayers, and biological membranes. Langmuir-Blodgett films, when sufficiently controlled, are used as liquid crystal alignment layers, as films for non-linear optics, and for modeling bio-membranes.

该项目的目的是研究朗缪尔薄膜在空气/水界面的边界张力和表面粘度，并确定如何控制朗缪尔单层膜的结构和动态响应。当分子在表面排列时，对称性被打破，导致表面分子之间产生长程静电排斥。单层内的运动与基底耦合。流体动力学和静电学的结合导致薄膜内产生长期的亚稳态。这些状态的形成以及它们的弛豫决定了生物膜的结构和动力学，并且对于制造 Langmuir-Blodgett 薄膜至关重要。该项目将重点研究作为单层薄膜的致密相分离聚合物孤岛的流变学。边界张力将被确定为各种参数（例如温度和分子量）的函数，并将结果与​​理论和数值结果进行比较。对于共聚物，将探讨液晶侧链分数增加对边界能和结构的影响。主要的教育目标是吸引和培训各个教育水平的多样化学生群体，并鼓励跨学科合作来解决重要技术问题的基础科学。%%%由自限制在流体表面的分子组成的朗缪尔薄膜作为技术和生物重要系统的准二维模型模型，例如泡沫、乳液、Langmuir-Blodgett 多层和生物膜。 Langmuir-Blodgett 薄膜在受到充分控制时可用作液晶取向层、非线性光学薄膜以及生物膜建模。