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Issue 24, 2012
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Nanogel formation of polymer solutions flowing through porous media

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Abstract

A gelation process was seen to occur when Boger fluids made from aqueous solutions of polyacrylamide (PAA) and NaCl flowed through porous media with certain characteristics. As these viscoelastic fluids flow through a porous medium, the pressure drop across the bed varies linearly with the flow rate, as also happens with Newtonian fluids. Above a critical flow rate, elastic effects set in and the pressure drop grows above the low-flow-rate linear regime. Increasing further the flow rate, a more dramatic increase in the slope of the pressure drop curve can be observed as a consequence of nanogel formation. In this work, we discuss the reasons for this gelation process based on our measurements using porous media of different sizes, porosity and chemical composition. Additionally, the rheological properties of the fluids were investigated for shear and extensional flows. The fluids were also tested as they flowed through different microfluidic analogues of the porous media. The results indicate that the nanogel inception occurs with the adsorption of PAA molecules on the surface of the porous media particles that contain silica on their surfaces. Subsequently, if the interparticle space is small enough a jamming process occurs leading to flow-induced gel formation.

Graphical abstract: Nanogel formation of polymer solutions flowing through porous media

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Publication details

The article was received on 21 Mar 2012, accepted on 26 Apr 2012 and first published on 14 May 2012


Article type: Paper
DOI: 10.1039/C2SM25654A
Citation: Soft Matter, 2012,8, 6445-6453
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    Nanogel formation of polymer solutions flowing through porous media

    L. Campo-Deaño, F. J. Galindo-Rosales, F. T. Pinho, M. A. Alves and M. S. N. Oliveira, Soft Matter, 2012, 8, 6445
    DOI: 10.1039/C2SM25654A

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