Osmotic compression and expansion of highly ordered clay dispersions

Langmuir : the ACS Journal of Surfaces and Colloids
Céline MartinB Cabane

Abstract

Aqueous dispersions of nanometric clay platelets (Laponite) have been dewatered through different techniques: centrifugation, mechanical compression, and osmotic stress (dialysis against a polymer solution). The positional and orientational correlations of the particles have been determined through small-angle neutron scattering. Uniaxial compression experiments produce concentrated dispersions (volume fraction > 0.03) in which the platelets have strong orientational and positional correlations. The orientational correlations cause the platelets to align with their normal along a common axis, which is the axis of compression. The positional correlations cause the platelets to be regularly spaced along this direction, with a spacing that matches the average volume per particle in the dispersion. The swelling law (volume fraction versus separation distance) is one-dimensional, as in a layered system. Changes in the applied osmotic pressure cause the water content of the dispersion to either rise or decrease, with time scales that are controlled by interparticle friction forces and by hydrodynamic drag. At long times, the dispersions approach osmotic equilibrium, which can be defined as the common limit of swelling and deswelling ...Continue Reading

References

Jun 17, 1996·Physical Review Letters·F PignonA Magnin
May 26, 2005·Journal of Colloid and Interface Science·Ana C Perdigon-AllerStuart M Clarke

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Citations

Apr 12, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Erwan PaineauLaurent J Michot
May 12, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Bo JönssonB Cabane
Oct 15, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·A ShahinS Anantha Ramakrishna
Sep 4, 2007·The Journal of Chemical Physics·Yogesh M Joshi
Jan 10, 2016·Journal of Colloid and Interface Science·A ThuressonM Skepö
Apr 9, 2008·European Journal of Pharmaceutics and Biopharmaceutics : Official Journal of Arbeitsgemeinschaft Für Pharmazeutische Verfahrenstechnik E.V·C VauthierD Labarre
Dec 7, 2010·Advances in Colloid and Interface Science·P BacchinP Aimar
Oct 21, 2016·Physical Chemistry Chemical Physics : PCCP·Coralie PasquierStéphane Pezennec
Dec 13, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Thomas GruhnHeike Emmerich
May 21, 2010·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·N I RingdalJ O Fossum
Dec 18, 2013·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Ravi Kumar Pujala, H B Bohidar
Sep 20, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Bo JönssonB Cabane
Mar 20, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·M SegadB Cabane
Oct 28, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Henrik HemmenKenneth D Knudsen
Nov 13, 2009·The Journal of Physical Chemistry. B·E PaineauL J Michot
Dec 18, 2014·The Journal of Physical Chemistry. B·Cuixia LianZhen Tong
Oct 31, 2012·The Journal of Physical Chemistry. B·Erwan PaineauPatrick Davidson
Feb 28, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Andrey ShalkevichPeter Schurtenberger

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