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The dielectric properties of charged nanoparticle colloids at radio and microwave frequencies: high frequency relaxation

Shahid Hussain1 and Ian J Ford2

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Charged particle colloids typically consist of particles with negative surface charge suspended in an aqueous electrolyte solution, and have been shown to display effective dielectric properties at radio and microwave frequencies which can potentially be tailored for a range of applications. This research describes a model for predicting such properties. A model previously used to account for the dielectric performance at low frequencies is extended to include higher-order terms in angular frequency, ω. The extended model encompasses the high and low frequency relaxation contributions for the dielectric properties of charged particle colloids. The parameters used to tailor these properties are identified.


PACS

82.70.Dd Colloids

77.22.Gm Dielectric loss and relaxation

61.46.Df Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)

Subjects

Soft matter, liquids and polymers

Condensed matter: electrical, magnetic and optical

Nanoscale science and low-D systems

Chemical physics and physical chemistry

Dates

Issue 1 (7 January 2008)

Received 25 May 2007, in final form 9 October 2007

Published 19 December 2007



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