Honciuc Andrei, Harant Adam W, Schwartz Daniel K
Department of Chemical and Biological Engineering, University of Colorado, Boulder, CO 80309, USA.
Langmuir. 2008 Jun 1;24(13):6562-6. doi: 10.1021/la8007365. Epub 2008 May 20.
Individual fatty acid molecules adsorbed at the interface between hexadecane and fused silica have been tracked using total internal reflection fluorescence microscopy. Two cooperative diffusive mechanisms are observed: continuous small-scale Brownian motion and occasional large "jumps." The continuous diffusion exhibits evidence of confinement. The effective interfacial diffusion coefficients for each mechanism increase systematically with temperature; an Arrhenius analysis gives an activation barrier of approximately 50 kJ/mol for "jumping" and an upper limit of approximately 10 kJ/mol for confined diffusion.
利用全内反射荧光显微镜对吸附在十六烷和熔融石英界面的单个脂肪酸分子进行了追踪。观察到两种协同扩散机制：连续的小规模布朗运动和偶尔的大“跳跃”。连续扩散表现出受限的迹象。每种机制的有效界面扩散系数随温度系统地增加；阿仑尼乌斯分析给出“跳跃”的活化能垒约为50 kJ/mol，受限扩散的上限约为10 kJ/mol。
