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Issue 4, 2016
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Dynamics of colloid accumulation under flow over porous obstacles

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Abstract

The accumulation of colloidal particles to build dense structures from dilute suspensions may follow distinct routes. The mechanical, structural and geometrical properties of these structures depend on local hydrodynamics and colloidal interactions. Using model suspensions flowing into microfabricated porous obstacles, we investigate this interplay by tuning both the flow pattern and the ionic strength. We observe the formation of a large diversity of shapes, and demonstrate that growing structures in turn influence the local velocity pattern, favouring particle deposition either locally or over a wide front. We also show that these structures are labile, stabilised by the flow pushing on them, in low ionic strength conditions, or cohesive, in a gel-like state, at higher ionic strength. The interplay between aggregate cohesion and erosion thus selects preferential growth modes and therefore dictates the final shape of the structure.

Graphical abstract: Dynamics of colloid accumulation under flow over porous obstacles

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Article information


Submitted
06 Aug 2015
Accepted
10 Nov 2015
First published
11 Nov 2015

Soft Matter, 2016,12, 1041-1050
Article type
Paper
Author version available

Dynamics of colloid accumulation under flow over porous obstacles

M. Robert de Saint Vincent, M. Abkarian and H. Tabuteau, Soft Matter, 2016, 12, 1041
DOI: 10.1039/C5SM01952D

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