Cerro Ramon L
Department of Chemical and Materials Engineering, University of Alabama in Huntsville, Huntsville, AL 35899, USA.
J Colloid Interface Sci. 2003 Jan 15;257(2):276-83. doi: 10.1016/s0021-9797(02)00009-7.
The objective of this paper is to point out the close relationship between contact line dynamics and LB film depositions, and it is designed to serve as a blueprint for future analysis of the LB technique. Moving contact lines and contact angles play a major role in Langmuir-Blodgett ultrathin film depositions. Although the effect of contact angles has been recognized for many years, a fundamental and comprehensive explanation of the phenomena taking place at the contact line has not been formulated before. Our understanding of contact line dynamics has improved thanks to careful experiments and new theoretical developments. Flow patterns depend on dynamic contact angle and the ratio of viscosities of the gas and liquid phases. More recently dynamic contact angles-and flow patterns-have been linked to forces of molecular and double-layer origin. The dynamic relationship of flow patterns to interfacial and transport properties can be used to explain seemingly contradictory experimental results reported by researchers during more than 60 years of experience with the L-B technique. Windows of operability can be defined for X-type and Z-type depositions that are useful in the design of experimental and industrial L-B deposition equipment.
本文的目的是指出接触线动力学与LB膜沉积之间的密切关系,并旨在作为未来LB技术分析的蓝图。移动接触线和接触角在朗缪尔-布洛杰特超薄膜沉积中起着主要作用。尽管接触角的影响已被认识多年,但此前尚未对接触线处发生的现象给出基本而全面的解释。由于精心的实验和新的理论发展,我们对接触线动力学的理解有所提高。流动模式取决于动态接触角以及气相和液相的粘度比。最近,动态接触角和流动模式已与分子力和双层力联系起来。流动模式与界面和传输特性之间的动态关系可用于解释研究人员在使用L-B技术60多年的经验中报告的看似矛盾的实验结果。可以为X型和Z型沉积定义可操作窗口,这对实验和工业LB沉积设备的设计很有用。