Normal and Shear Stresses in Dynamic, Submicron Liquid Bridges

这个项目是一个为期3年的摩擦学接触毛细效应的实验和理论研究。这项研究的动机是形状因数越来越小的技术趋势，这导致了更高的比表面积/体积比和越来越重要的液体中介界面粘结。在动态条件下，用几种不同的液体以亚微米界面间距直接测量毛细管负压。要研究的液体包括选定的全氟聚醚(PFPE)油和水。将研究液体性质的影响，如相对分子质量、粘度、极性和表面张力。数学建模将结合实验进行。预计这项工作将产生更好的摩擦学接触毛细效应模型，从而为微系统和纳米系统设计者提供改进的数学工具。研究生和本科生将接触到现代的实验和计算方法，并将学习液体媒介接触的基本原理。此外，将做出特别努力，通过利用佐治亚理工学院现有的NSF赞助的项目，让代表不足的学生参与这个项目，该项目为工程和科学领域代表不足的学生提供研究生津贴和本科生研究资金。

0200681StreatorThis project is a 3-year experimental and theoretical investigation of capillary effects in tribological contacts. The proposed investigation is motivated by the technological trend for smaller and smaller form factors, leading to higher surface-area-to-volume ratios and an increasing significance of liquid-mediated interfacial adhesion. Direct measurements of negative capillary pressures will be conducted with several different liquids at sub-micron interfacial spacings, under dynamic conditions. The liquids to be studied include selected perfluoropolyether (PFPE) oils as well as water. The effects of liquid properties such a molecular weight, viscosity, polarity and surface tension will be investigated. Mathematical modeling will be conducted in conjunction with the experiments. It is anticipated that this work will lead to better models of capillary effects in tribological contacts, thereby providing micro- and nano-system designers with improved mathematical tools. Graduate and undergraduate students will be exposed to modern experimental and computational methods, and will learn fundamentals of liquid-mediated contact. Additionally, special efforts will be made to involve under-represented students in this project by taking advantage of an existing NSF-sponsored program at Georgia Tech that provides graduate stipends and undergraduate research funds to under-represented students in engineering and science.