Interfacial tension and wetting in colloid-polymer mixtures
Interfacial tension and wetting in colloid-polymer mixtures
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DOI：
10.1063/1.1635810
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发表时间：
2004-01-22
影响因子：
4.4
通讯作者：
van Roij, R
中科院分区：
文献类型：
--
作者：
Aarts, DGAL;Dullens, RPA;van Roij, R
我们计算了理想和排斥体积相互作用聚合物在相分离的胶体-聚合物混合物中的界面张力和润湿行为。在最近开发的自由体积理论的扩展中，包括聚合物相互作用[Aarts，Tuinier和Lekkerkerker，J. Phys.：康登斯Matter 14，7551（2002）]，通过添加货车德瓦尔斯平方梯度项来计算自由界面的界面张力。在硬壁的润湿行为计算Cahn-Fisher-Nakanishi的方法，考虑到一个和两个身体的胶体壁的相互作用。相互作用的聚合物与理想的聚合物的结果进行比较，我们发现，对于相互作用的聚合物的界面张力不急剧增加的气体-液体胶体密度差的函数。此外，润湿转变转移到更高的聚合物浓度，甚至转移到三线以上。的界面张力和润湿的预测相比，最近的实验。(C)2004年，美国物理学会。
We calculate the interfacial tension and the wetting behavior in phase separated colloid-polymer mixtures both for ideal and excluded volume interacting polymers. Within the recently developed extension of the free volume theory to include polymer interactions [Aarts, Tuinier, and Lekkerkerker, J. Phys.: Condens. Matter 14, 7551 (2002)] the interfacial tension of the free interface is calculated by adding a van der Waals squared gradient term. The wetting behavior at a hard wall is calculated following a Cahn-Fisher-Nakanishi approach taking the one- and two-body colloid-wall interactions into account. Comparing results for interacting polymers with those for ideal polymers we find that for interacting polymers the interfacial tension does not increase as steeply as a function of the gas-liquid colloid density difference. Furthermore, the wetting transition shifts to higher polymer concentrations, even to above the triple line. The predictions for both the interfacial tension and the wetting are compared to recent experiments. (C) 2004 American Institute of Physics.