(24394) Transport of Electrolyte Solutions in porous Hydrophilic

Transport of Electrolyte Solutions in porous
Hydrophilic Silica Membranes
R. Renou1,2, A. Szymczyk1, and A. Ghoufi2
1
Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS, Université de Rennes 1, 263
Avenue du Général Leclerc, 35042 Rennes, France; Université Européenne de
Bretagne,France
[email protected]
2
Institut de Physique de Rennes, UMR 6251 CNRS, Université de Rennes 1, 263
avenue Général Leclerc, 35042 Rennes, France
[email protected]
Manipulating of electrolyte solutions is ubiquitous in numerous fields ranging from
condensed to soft matter. The fundamental understanding of the molecular mechanism ruling
the macroscopic properties is inescapable to well rationalize the engineering processes. In
confined situation such as nanofluidic or nanofiltration interactions between the fluids and the
surface drastically modify the usual macroscopic properties. In this presentation we addressed
a structural and dielectric analysis of confined NaCl, NaI, MgCl2 and Na2SO4 in nanoporous
hydrophilic silica membranes. We highlight a dielectric anisotropy of confined water and an
unusual increase in radial component of permittivity with confined solutions with respect to
the decrease in permittivity in bulk solution phase [1,2]. Structurally, we investigate the size,
the polarizability and the salt effect on water confinement and ions transport through a porous
silica membrane.
Key Words: (Inorganic Membranes, molecular simulation, nanofiltration, ions transport).
References
[1] A. Ghoufi, A. Szymczyk, R. Renou and M. Ding Europhys. Letters, 2012, 99 (3), 37008.
[2] H. Zhu, A. Ghoufi, A. Szymczyk, B. Balannec and D. Morineau Phys. Rev. Letters 2012, 109,107801.