A study on air bubble wetting: Role of surface wettability, surface tension, and ionic surfactants

被引:31
作者
George, Jijo Easo [1 ]
Chidangil, Santhosh [2 ]
George, Sajan D. [1 ,2 ]
机构
[1] Manipal Univ, Ctr Appl Nanosci, Manipal 576104, Karnataka, India
[2] Manipal Univ, Dept Atom & Mol Phys, Manipal 576104, Karnataka, India
关键词
Air bubble contact angle; Superaerophobicity; Contact angle hysteresis; Surface tension; Ionic surfactants; OXYGEN PLASMA; PDMS SURFACES; HYDROPHOBIC RECOVERY; ULTRAVIOLET/OZONE TREATMENT; SUPERHYDROPHOBIC SURFACES; POLY(DIMETHYL SILOXANE); DISJOINING PRESSURE; FORCE; WATER; FILM;
D O I
10.1016/j.apsusc.2017.03.071
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070305 [高分子化学与物理];
摘要
Fabrication of hydrophobic/hydrophilic surfaces by biomimicking nature has attracted significant attention recently due to their potential usage in technologies, ranging from self-cleaning to DNA condensation. Despite the potential applications, compared to surfaces of tailored wettability, less attention has been paid towards development and understanding of air bubble adhesion and its dynamics on surfaces with varying wettability. In this manuscript, following the commonly used approach of oxygen plasma treatment, polydimethylsiloxane surfaces with tunable wettability are prepared. The role of plasma treatment conditions on the surface hydrophilicity and the consequent effect on adhesion dynamics of an underwater air bubble is explored for the first time. The ATR-FTIR spectroscopic analysis reveals that the change in hydrophilicity arises from the chemical modification of the surface, manifested as Si-OH vibrations in the spectra. The thickness of the formed thin liquid film at the surface responsible for the experimentally observed air bubble repellency is estimated from the augmented Young-Laplace equation. The concentration dependent studies using cationic as well as anionic surfactant elucidate that the reduced surface tension of the aqueous solution results in a stable thicker film and causes non-adherence of air bubble to the aerophilic surface. Furthermore, the study carried out to understand the combined effect of plasma treatment and surfactants reveals that even below critical micelle concentration, a negatively charged surface results in air bubble repellency for the anionic surfactant, whereas only enhanced air bubble contact angle is observed for the cationic surfactant. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:117 / 125
页数:9
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