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Issue 41, 2012
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Probing timescales for colloidal particle adsorption using slug bubbles in rectangular microchannels

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Abstract

The adsorption of particles to fluid–fluid interfaces is a key step in the generation of colloidosomes and particle-stabilized emulsions. Microfluidic channels are a promising tool for generating particle-stabilized drops and bubbles with independent control over the bubble size and the concentration of particles adsorbed at the fluid interface. In this paper, we present experimental observations of the adsorption of a nanoparticle-surfactant suspension to confined bubbles translating along a microchannel. Long bubbles exhibit a unique two-lobed shape that is linked to the adsorption of surface-active particles to the interface at a timescale comparable to the residence time in the channel. An accompanying decrease in the bubble velocity results from the added viscous drag at the bubble interface. We develop a transport model to describe the rate of particle adsorption to the interface and find good agreement between the model estimates of bubble shape changes and experimental observation. The formation of the two-lobed shape is due to a difference in the velocity of the front and rear of the bubble, which can promote bubble break-up.

Graphical abstract: Probing timescales for colloidal particle adsorption using slug bubbles in rectangular microchannels

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Publication details

The article was received on 26 Apr 2012, accepted on 02 Aug 2012 and first published on 28 Aug 2012


Article type: Paper
DOI: 10.1039/C2SM25970B
Citation: Soft Matter, 2012,8, 10759-10772

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    Probing timescales for colloidal particle adsorption using slug bubbles in rectangular microchannels

    A. P. Kotula and S. L. Anna, Soft Matter, 2012, 8, 10759
    DOI: 10.1039/C2SM25970B

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