Extrand CW
Fluoroware, 102 Jonathan Blvd. N., Chaska, Minnesota, 55318
J Colloid Interface Sci. 1998 Nov 1;207(1):11-19. doi: 10.1006/jcis.1998.5743.
Thermodynamic expressions for the free energy of contact angle hysteresis have been derived assuming that wetting can be modeled as an adsorption-desorption process. The cause of hysteresis is not specified; it could be due to surface imperfections or simply irreversible interaction of the contact liquid and solid. The model shows that even near-zero contact angles can represent substantial free energies. Experimental data from previous work were used to calculate free energies for a variety of polymer and surfactant surfaces. For each surface, a variety of organic liquids and water gave similar free energy values. Nonpolar polymer surfaces gave free energies that corresponded to van der Waals interactions. Free energies were usually higher for polar polymers, arising from stronger interactions that may involve more extensive restructuring of groups at the interface. Copyright 1998 Academic Press.
假定润湿性可被模拟为吸附 - 解吸过程，已推导出接触角滞后自由能的热力学表达式。滞后的原因未明确说明；它可能是由于表面缺陷，或者仅仅是接触液体与固体之间的不可逆相互作用。该模型表明，即使接近零的接触角也可能代表相当大的自由能。利用先前工作中的实验数据计算了各种聚合物和表面活性剂表面的自由能。对于每个表面，多种有机液体和水给出了相似的自由能值。非极性聚合物表面的自由能对应于范德华相互作用。极性聚合物的自由能通常更高，这是由更强的相互作用引起的，这种相互作用可能涉及界面处基团更广泛的重组。版权所有1998年学术出版社。
