How Surfactants Affect Droplet Wetting on Hydrophobic Microstructures

被引:18
|
作者
Shardt, Nadia [1 ]
Bigdeli, Masoud Bozorg [2 ]
Elliott, Janet A. W. [1 ]
Tsai, Peichun Amy [2 ]
机构
[1] Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 1H9, Canada
[2] Univ Alberta, Dept Mech Engn, Edmonton, AB T6G 1H9, Canada
来源
JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2019年 / 10卷 / 23期
基金
加拿大自然科学与工程研究理事会;
关键词
CONTACT-ANGLE; ADSORPTION DYNAMICS; SOLID-SURFACES; CASSIE-BAXTER; WENZEL STATE; TRANSITION; ROUGH; MODEL; STABILITY; EQUATION;
D O I
10.1021/acs.jpclett.9b02802
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Surfactants, as amphiphilic molecules, adsorb easily at interfaces and can detrimentally destroy the useful, gas-trapping wetting state (Cassie-Baxter, CB) of a drop on superhydrophobic surfaces. Here, we provide a quantitative understanding of how surfactants alter the wetting state and contact angle of aqueous drops on hydrophobic microstructures of different roughness (r) and solid fraction (phi). Experimentally, at low surfactant concentrations (C), some drops attain a homogeneous wetting state (Wenzel, W), while others attain the CB state whose large contact angles can be predicted by a thermodynamic model. In contrast, all of our high-C drops attain the Wenzel state. To explain this observed transition, we consider the free energy and find that, theoretically, for our surfaces the W state is always preferred, while the CB state is metastable at low C, consistent with experimental results. Furthermore, we provide a beneficial blueprint for stable CB states for applications exploiting superhydrophobicity.
引用
收藏
页码:7510 / 7515
页数:11
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