Kinetics of slow collapse process: Thermodynamic description of rate constants
Kinetics of slow collapse process: Thermodynamic description of rate constants
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缓慢塌陷过程的动力学：速率常数的热力学描述
DOI：
10.1016/j.apsusc.2006.02.029
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发表时间：
2006
影响因子：
6.7
通讯作者：
M. Weis
中科院分区：
文献类型：
--
作者：
M. Weis
在高于平衡铺展压力的表面压力下，在空气/水界面处形成的不溶性单分子层是不稳定的。本文对经典的均质形核理论进行了修正，增加了活化能项。它允许定量的热力学解释的缓慢崩溃相变。硬脂酸朗缪尔薄膜的崩溃已进行了系统的测量面积损失时间等压依赖性在不同的温度和等温依赖性在不同的压力。计算了成核（Eα=1.32eV）和生长（Eβ=1.55eV）过程的激活能和激活熵。在吉布斯能分析的基础上讨论了不同压力下的实验数据。
Insoluble monolayer formed at the air/water interface compressed at a surface pressure above the equilibrium spreading pressure is unstable. In presented paper the classical theory for homogeneous nucleation is modified adding the activation energy term. It allows quantitative thermodynamic interpretation of the slow collapse phase transformation. The collapse of stearic acid Langmuir films has been carried out by systematic measurements of the area loss–time isobaric dependencies at various temperatures and isothermal dependencies at various pressures. Activation energies (activation enthalpies) and activation entropies have been evaluated for the nucleation (Eα=1.32eV) and the growth (Eβ=1.55eV) processes. The experimental data for various pressures are discussed on the basis of the Gibbs energy analysis.