Contact
    Start Publications Bubbles with tunable mobility of surfaces in ethanol-NaCl ...
    ←  Publication Finder
    Attension

    Bubbles with tunable mobility of surfaces in ethanol-NaCl aqueous solutions

    Year: 2019

    Journal: J. Colloid Interface Sci., Volume 556, NOV 15, page 345–351

    Authors: Zhang, Xurui; Manica, Rogerio; Tang, Yuechao; Liu, Qingxia; Xu, Zhenghe

    Organizations: Natural Sciences and Engineering Research Council CanadaNatural Sciences and Engineering Research Council of Canada (NSERC); Canada (NSERC) Industrial Research Chair Program in Oil Sands Engineering; Alberta Innovates- Energy and Environmental Solutions (AI-EES), Canada; Zhujiang Talent Program of Guangdong Province, Canada [K17253301]

    Keywords: Bubble; Hydrodynamic boundary condition; Mobility; Ethanol-NaCl aqueous solution; Air-liquid interface

    The mobility of bubble surfaces in aqueous solutions can be hindered by even a trace amount of contaminants at the air-liquid interface. Adding ethanol into an aqueous solution is expected to modify the activity of the contaminants and hence their level at the air-liquid interface, which can possibly tune the mobility of the bubble surface. The mobility of the bubble surface was characterized by measuring dynamic interactions between a millimeter-size air bubble and a flat mica surface in ethanol-NaCl aqueous solutions using the newly developed dynamic force apparatus and quantified by the Stokes-Reynolds-Young-Laplace model. For a given bubble approach velocity, the hydrodynamic boundary condition at the air-liquid interface deviated from a tangentially immobile boundary at a critical ethanol concentration and converged gradually to fully mobile boundary with further increasing the ethanol concentration. Increasing the bubble approach velocity was found to reduce the critical ethanol concentration that was needed to change the mobility of the bubble surface. By adding surfactants to the system of high ethanol concentration and fully mobile air-liquid interface, the boundary condition became immobile when the amount of surfactant reached a critical concentration. This study introduced a method to control the hydrodynamic boundary condition at the air-liquid interface in mixed liquids. (C) 2019 Published by Elsevier Inc.
    View publication