Applications of Diffusing Light Spectroscopies to the Study of Dense Random Media

9306814 Yodh这是一个开发和应用漫射光探针来研究混浊材料的结构和动力学的实验项目。实验计划：(1)研究光在胶体晶体中的输运和波动，特别是缺陷和结构相关性的影响；(2)将这些新光谱应用于浆料、砂堆、凝胶、微乳液和泡沫等更复杂混浊物质的演化研究；(3)探索在浑浊介质中引入调幅光源时产生的光能密度行波的基本方面；(4)继续研究致密颗粒胶态悬浮液的动力学和结构相关性。通过这些研究获得的知识将提高我们对新材料的基本理解，将扩展我们对漫射光特性的认识，并将导致用漫射光成像不透明材料的新技术。该项目涉及与位于新泽西州安南代尔的埃克森研究与工程公司的科学家积极合作。从颗粒介质中产生的漫射光可以通过分析来获得组成散射介质的粒子的结构和动力学信息。例如，散射光开始用于乳房x线照相术和其他非破坏性分析技术。本项目将开发并应用漫射光探针来研究一系列浑浊材料的结构和动力学。其中包括浆料、砂堆、凝胶、微乳液和泡沫。通过这些研究获得的知识将提高我们对新材料的基本理解，将扩展我们对漫射光特性的认识，并将导致用漫射光成像不透明材料的新技术。该项目涉及到与位于新泽西州安南代尔的埃克森研究与工程公司的科学家们的积极合作。＊＊＊

9306814 Yodh This is an experimental program to develop and apply diffusing- light probes to the study of the structure and dynamics of turbid materials. Experiments are planned to (1) investigate the transport and fluctuation of light in colloidal crystals, especially the effects of defects and structural correlations; (2) apply these new spectroscopies to study the evolution more complex turbid material such as slurries, sand piles, gels, microemulsions, and foams; (3) explore the fundamental aspects of traveling waves of light energy density that are produce when amplitude modulated light sources are introduced into a turbid medium; and (4) continue our studies of the dynamical and structural correlations in dense colloidal suspensions of particles. The knowledge gained by these studies will improve our fundamental understanding of new kinds of materials, will extend our knowledge of the properties of diffusing light, and will lead to new techniques for imaging opaque materials with diffusing light. The project involves active collaboration with scientists at Exxon Research and Engineering Corporation, Annandale, New Jersey. %%% Diffuse light emerging from granular media can be analyzed to gain information about the structure and dynamics of the particles making up the scattering medium. For example scattered light is beginning to be used in mammography and other non-destructive analytical techniques. This project will develop and apply diffusing-light probes to the study of the structure and dynamics of a range of turbid materials. Among these are slurries, sand piles, gels, microemulsions, and foams. The knowledge gained by these studies will improve our fundamental understanding of new kinds of materials, will extend our knowledge of the properties of diffusing light, and will lead to new techniques for imaging opaque materials with diffusing light. The project involves active collaboration with scientists at Exxon Research and Engineering Corpor ation, Annandale, New Jersey. ***