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Electric field induced polarization effects measured by in situ neutron spectroscopy

journal contribution
posted on 2017-10-02, 00:00 authored by R Ignazzi, Will GatesWill Gates, S O Diallo, D Yu, F Juranyi, F Natali, H N Bordallo
Despite the success of electrical stimulation in many areas, including clay or sludge dewatering, extraction of juices from fruit pulp, fracture healing, and targeted drug delivery, the induced transport mechanisms are controlled by unknown factors. While electroosmotic dewatering of clays
particles <10 μm is well-known, understanding of how tightly bound water molecules are removed from within the clay interlayers is still incomplete. By performing quasielastic neutron scattering experiments with in situ electric field stimuli on calcium montmorillonite (Ca-Mt) prehydrated at relative humidity (RH) of 58 and 85%, we observed an increase in the
water mean residence time, suggesting that hydrogen bonding lifetimes are prolonged under electric field. Assuming that at these RH most all water present resides within the interlayer space of the Ca-Mt, this result indicates strong polarization of the water by the interlayer cation. This electroosmotic induced reorganization has important implications in terms of ion mobility and aqueous chemical reaction mechanisms.

History

Journal

Journal of physical chemistry c

Volume

121

Issue

42

Pagination

23582 - 23591

Publisher

American Chemical Society

Location

Washington, D.C.

ISSN

1932-7447

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2017, American Chemical Society