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Dielectric Relaxation in Biological SystemsPhysical Principles, Methods, and Applications$
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Valerica Raicu and Yuri Feldman

Print publication date: 2015

Print ISBN-13: 9780199686513

Published to Oxford Scholarship Online: August 2015

DOI: 10.1093/acprof:oso/9780199686513.001.0001

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Dielectric Relaxation of Water

Dielectric Relaxation of Water

(p.189) 3.1 Dielectric Relaxation of Water
Dielectric Relaxation in Biological Systems

Udo Kaatze

Oxford University Press

Dielectric relaxation of water as well as ionic and non-ionic aqueous solutions is briefly described as a basic principle of the more complex relaxation characteristics in biological systems. Proceeding from the architecture of the water molecule the existence of a permanent electric dipole moment, providing the coupling to electromagnetic fields, is demonstrated. Also the unique hydrogen bond network of water, leading to non-instantaneous dipole reorientation and thus relaxation behavior of the dielectric spectrum, is inferred from the molecular structure. Consulting literature data the effect of various solutes on the dielectric relaxation of water is presented and discussed in terms of variations in the molecular interactions. Extrapolated static permittivities of aqueous solutions are presented and related to the effects of dielectric saturation and kinetic depolarization. The discussion involves the difficulty of dipole orientation correlation and appropriate mixture relation for aqueous solutions. Attention is given to the exceedingly high proton mobility.

Keywords:   water molecule, water structure, dielectric spectrum, relaxation models, hydration, orientation correlation, dielectric saturation, kinetic depolarization, relaxation times, proton motion

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