Mass transfer between microbubbles

Yuqi Yang

doi:10.1016/j.jcis.2020.02.120

2020-07-01

PRE

Raymond R. Dagastine *

DOI：10.1016/j.jcis.2020.02.120

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摘要

En 中文

Hypothesis: The role of interfacial coatings in gas transport dynamics in foam coarsening is often difficult to quantify. The complexity of foam coarsening measurements or gas transport measurements between bubbles requires assumptions about the liquid thin film thickness profile in order to explore the effects of interfacial coatings on gas transport. It should be possible to independently quantify the effects from changes in film thickness and interfacial permeability by using both atomic force microscopy and optical microscopy to obtain time snapshots of this dynamic process. Further, it is expected that the surfactant and polymer interfacial coatings will affect the mass transfer differently. Experiments: We measure the mass transfer between the same nitrogen microbubbles pairs in an aqueous solution using two methods simultaneously. First, we quantify the bubble volume changes with time via microscopy and second, we use Atomic Force Microscopy to measure the film thickness and mass transfer resistances using a model for the gas transport. Findings: Modelling of the interface deformation, surface forces and mass transfer across the thin film agrees with independent measurements of changes in bubble size. We demonstrate that an anionic surfactant does not provide a barrier to mass transfer, but does enhance mass transfer above the critical micelle concentration. In contrast, a polymer monolayer at the interface does restrict mass transfer. (C) 2020 Published by Elsevier Inc.

Keyword:

Colloids

Interfaces

Bubbles

Mass transfer

Thin films

Soft matter

Atomic force microscopy

Ostwald ripening

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期刊

Journal of Colloid and Interface Science

IF:

9.7

论文数:

3.7W

被引数:

14.7W

机构

china university of petroleum

学者数:

4.1W

论文数: 2.7W

被引数: 30

university of melbourne

学者数:

5.7W

论文数: 5.4W

被引数: 69

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