Creation of Nanoscopic Structures at Various Interfaces

在各种界面处创建纳米结构

• 批准号: 0109077
• 负责人: Shenda Baker
• 金额: $ 31.2万
• 依托单位: Harvey Mudd College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-06-01 至 2007-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0109077&HistoricalAwards=false
• 关键词: Creation; Nanoscopic; Structures; Various; Interfaces

The variables affecting the nanoscopic geometry of diblock copolymers will be examined for a variety of amphiphilic diblock asymmetries at the liquid-air, solid-air and solid-liquid interfaces. Because the features of diblocks tend to be molecular in scale, the sizes observed naturally fall into the range of nanometers. One aspect of this work focuses on the controlled deposition of diblock copolymers on silicon substrates using a Langmuir-Blodgett (LB) trough, where the surface density is a selectable parameter. Different asymmetries of an amphiphilic diblock have produced various morphologies due to aggregation of the water-insoluble block. In a complementary fashion to the LB studies, the kinetics and surface excess of the same selection of diblocks adsorbed from a variety of solvents to a liquid-solid interface will be determined for solution concentrations above and below the critical micelle concentration (cmc) using Fourier Transform IR spectroscopy in the mode of attenuated total reflection (FTIR-ATR). Atomic Force Microscopy neutron reflectivity and ellipsometry will aid in the interpretation of surface excess and three-dimensional structure. The combination of these approaches should provide a better understanding of the thermodynamic and kinetic parameters that can b used to control surface density and geometry.%%%Participants in the research projects will include a postdoctoral researcher and several undergraduates. In addition, the current interaction with a local high school will be enhanced with a high school student research opportunity and more interactions and follow-up experiences. An advanced course in Surface Structure and Spectroscopy will continue to be developed in order to take advantage of new technologies in education.

影响的两嵌段共聚物的纳米级几何形状的变量将检查各种两亲性的两嵌段不对称性在液体-空气，固体-空气和固体-液体界面。 由于二嵌段的特征倾向于分子尺度，因此观察到的尺寸自然落入纳米范围内。 这项工作的一个方面集中在控制沉积的二嵌段共聚物在硅基板上使用的朗缪尔-布洛杰特（LB）槽，其中的表面密度是一个可选的参数。 两亲性二嵌段的不同不对称性由于水不溶性嵌段的聚集而产生各种形态。 在一个补充的方式LB的研究，动力学和表面过剩的相同选择的二嵌段吸附从各种溶剂的液-固界面将确定溶液浓度高于和低于临界胶束浓度（CMC），使用傅里叶变换红外光谱的衰减全反射（FTIR-ATR）的模式。 原子力显微镜、中子反射率和椭圆偏振法将有助于解释表面过剩和三维结构。 这些方法的结合应能更好地理解可B控制表面密度和几何形状的热力学和动力学参数。研究项目的参与者将包括一名博士后研究员和几名本科生。 此外，目前与当地高中的互动将得到加强，高中学生的研究机会和更多的互动和后续经验。 将继续开发表面结构和光谱学高级课程，以利用教育中的新技术。