alexa Influence of Localized Surface Charge Distributions on
ISSN: 2161-0398

Journal of Physical Chemistry & Biophysics
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Research Article

Influence of Localized Surface Charge Distributions on the Dielectric Relaxation Spectra of Spherical Colloidal Particles in Aqueous Solution

Cesare Cametti*
Dipartimento di Fisica, Universita’ di Roma "La Sapienza" Piazzale A. Moro 5, I-00185, Rome, Italy
*Corresponding Author : Cesare Cametti
Dipartimento di Fisica
Universita’ di Roma "La Sapienza" Piazzale A Moro 5
I-00185, Rome, Italy
Tel: 39063312462
E-mail: [email protected]
Received: February 18, 2016; Accepted: March 07, 2016; Published: March 10, 2016
Citation: Cametti C (2016) Influence of Localized Surface Charge Distributions on the Dielectric Relaxation Spectra of Spherical Colloidal Particles in Aqueous Solution. J Phys Chem Biophys 6:209. doi:10.4172/2161-0398.1000209
Copyright: © 2016 Cametti C. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


The influence of localized charge distributions at the interfaces of spherical colloidal particles in aqueous suspension is discussed in the light of the effective medium approximation theory of heterogeneous systems. The approach is shown to give analytical results in the case of shelled particles with the presence of two distinct interfaces. The whole dielectric response of the system gives rise to different relaxation contributions, falling in different frequency regions and attributed to different polarization mechanisms, at a molecular level. In particular, the number and the strength of the dielectric relaxations associated with the presence of localized charges is discussed.


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