Influence of surface-active agents on the dynamic wetting film rupture: Gas migration and surface nanobubbles formation (Open Access)--颗粒学报PARTICUOLOGY

a Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, China
b Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, 999077, China
c Beijing Petrochemical Engineering Co., Ltd., Beijing, 100107, China
d School of Innovation and Entrepreneurship, Southern University of Science and Technology, Shenzhen, 518055, China

10.1016/j.partic.2024.11.004

Volume 96, January 2025, Pages 171-179

Received 28 September 2024, Revised 14 November 2024, Accepted 20 November 2024, Available online 28 November 2024, Version of Record 5 December 2024.

E-mail: wucn@sustech.edu.cn; liuk@sustech.edu.cn

Highlights

● High-speed dual-wavelength interferometry with precise motion control was employed.

● Dynamic wetting film rupture caused by gas migration was observed and analyzed.

● Surfactants delay wetting film rupture by reducing drainage rate and gas migration.

● Salt ions accelerate wetting film rupture by enhancing gas migration and drainage.

● Surfactants significantly influence triple-phase contact dynamic of wetting film.

Abstract

In this research, precise motion control and synchronized high-speed microscopic dual-wavelength interferometry were employed to investigate the impact of surface-active components on the rupture behavior of wetting films. The findings unveiled a novel mechanism for wetting film rupture at hydrophobic interfaces, propelled by gas migration towards the solid-liquid interface, resulting in the nucleation and growth of surface nanobubble. Salt ions accelerate film rupture by reducing electrostatic interactions and enhancing gas transfer, whereas surfactant adsorption immobilizes the gas-liquid interface through the Marangoni effect, thereby postponing rupture by impeding gas migration and surface nanobubble formation. Furthermore, surfactants influence the kinetics of three-phase contact line formation, where variations in molecular structure, solubility, and ionic properties contributing to differing levels of friction, and thereby affecting the overall dynamics of wetting films.

Graphical abstract

Keywords

Wetting film rupture; Gas migration; Surface nanobubbles; Surface-active agents

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