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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 BordalloDespite 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.
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 cVolume
121Issue
42Pagination
23582 - 23591Publisher
American Chemical SocietyLocation
Washington, D.C.Publisher DOI
ISSN
1932-7447Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2017, American Chemical SocietyUsage metrics
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Science & TechnologyPhysical SciencesTechnologyChemistry, PhysicalNanoscience & NanotechnologyMaterials Science, MultidisciplinaryChemistryScience & Technology - Other TopicsMaterials ScienceX-RAY-DIFFRACTIONCA-MONTMORILLONITEWATER DESORPTIONEXCHANGED FORMSPART ISCATTERINGDYNAMICSCLAYSSORPTIONVISUALIZATION
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