Inward Flow of Intervening Liquid Films Driven by the Marangoni Effect during Bubble-Solid Collisions in Ethyl Alcohol-NaCl Aqueous Solutions

Zhang，Xurui1,2; Manica，Rogerio2; Liu，Qingxia2; Xu，Zhenghe2,3

2021

10.1021/acs.langmuir.0c03600

LANGMUIR   影响因子和分区

0743-7463

1520-5827

The drainage dynamics of confined thin liquid films between an air bubble and a freshly cleaved mica surface were investigated in ethyl alcohol aqueous solutions. Focus was given to the holding stage, in which an unexpected increase in the thickness of a few hundred nanometers at the center of the film was captured by interferometry in ethyl alcohol-500 mM NaCl aqueous solutions. Such an increase in film thickness occurred when the ethyl alcohol concentration exceeded the critical value at a bubble approach velocity of 100 μm/s. For a given ethyl alcohol concentration, the increase in thickness at the center of the film did not happen when the bubble approach velocity was decreased to 10 μm/s. Compared to the cases in ethyl alcohol-500 mM NaCl solutions, no increase in thickness at the center of the film was observed in ethyl alcohol-water solutions under the same ethyl alcohol concentration and bubble approach velocity. The phenomenon of the increasing thickness at the center of the film was attributed to the net inward flow in the film, resulting from competition between the inward Marangoni flow and the outward drainage flow that was hindered by the narrow channel at the barrier rim of the film under a high electrolyte concentration. The inward Marangoni flow was achieved by a concentration gradient of ethyl alcohol between the film and the bulk solution resulting from the mobile air-liquid interface in the initial approaching period.

SCI ; EI

英语

其他

Fundamental Research Funds for the Central Universities[xxj022020012] ; China Postdoctoral Science Foundation[2019M663675]

Chemistry ; Materials Science

Chemistry, Multidisciplinary ; Chemistry, Physical ; Materials Science, Multidisciplinary

WOS:000640891400009

AMER CHEMICAL SOC

20211810299551

Electrolytes ; Ethanol ; Liquid films ; Mica ; Sodium chloride ; Viscous flow

Minerals:482.2 ; Fluid Flow, General:631.1 ; Electric Batteries and Fuel Cells:702 ; Physical Chemistry:801.4 ; Chemical Agents and Basic Industrial Chemicals:803 ; Chemical Products Generally:804 ; Organic Compounds:804.1

CHEMISTRY

2-s2.0-85104275422

Scopus

1.State Key Laboratory for Strength and Vibration of Mechanical Structures,School of Aerospace Engineering,Xi'An Jiaotong University,Xi'an,710049,China
2.Department of Chemical and Materials Engineering,University of Alberta,Edmonton,T6G1H9,Canada
3.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Zhang，Xurui,Manica，Rogerio,Liu，Qingxia,et al. Inward Flow of Intervening Liquid Films Driven by the Marangoni Effect during Bubble-Solid Collisions in Ethyl Alcohol-NaCl Aqueous Solutions[J]. LANGMUIR,2021,37(14):4121-4128.

Zhang，Xurui,Manica，Rogerio,Liu，Qingxia,&Xu，Zhenghe.(2021).Inward Flow of Intervening Liquid Films Driven by the Marangoni Effect during Bubble-Solid Collisions in Ethyl Alcohol-NaCl Aqueous Solutions.LANGMUIR,37(14),4121-4128.

Zhang，Xurui,et al."Inward Flow of Intervening Liquid Films Driven by the Marangoni Effect during Bubble-Solid Collisions in Ethyl Alcohol-NaCl Aqueous Solutions".LANGMUIR 37.14(2021):4121-4128.