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Single-Colloidal Particle Impedance Spectroscopy: Complete Equivalent Circuit Analysis of Polyelectrolyte Microcapsules

Single-Colloidal Particle Impedance Spectroscopy: Complete Equivalent Circuit Analysis of Polyelectrolyte Microcapsules
Single-Colloidal Particle Impedance Spectroscopy: Complete Equivalent Circuit Analysis of Polyelectrolyte Microcapsules
We present a high-speed microfluidic technique for characterizing the dielectric properties of individual polyelectrolyte microcapsules with different shell thicknesses using single-particle electrical impedance spectroscopy. Complete equivalent circuit analysis is developed to describe the electrical behavior of solid homogeneous microparticles and shelled microcapsules in suspension. The complete circuit model, which includes the resistance of the shell layer and the capacitance of the inner core, has been used to determine the permittivity and conductivity in the shell of single capsules. The PSpice circuit simulations, based on the developed complete circuit models, are used to analyze the experimental data. The relative permittivity of the polyelectrolyte capsule shell is determined to be 50, and the conductivities of the shells of six- and nine-layer microcapsules are estimated to be 28 +/- 6 and 3.3 +/- 1.7 mS m(-1), respectively.
3821-3828
Sun, T
f3048ab3-1344-4c03-8296-6edd359d9048
Bernabini, C
b83994ee-445a-4ff6-a638-5b272c158300
Morgan, H
de00d59f-a5a2-48c4-a99a-1d5dd7854174
Sun, T
f3048ab3-1344-4c03-8296-6edd359d9048
Bernabini, C
b83994ee-445a-4ff6-a638-5b272c158300
Morgan, H
de00d59f-a5a2-48c4-a99a-1d5dd7854174

Sun, T, Bernabini, C and Morgan, H (2010) Single-Colloidal Particle Impedance Spectroscopy: Complete Equivalent Circuit Analysis of Polyelectrolyte Microcapsules Langmuir, 26, pp. 3821-3828.

Record type: Article

Abstract

We present a high-speed microfluidic technique for characterizing the dielectric properties of individual polyelectrolyte microcapsules with different shell thicknesses using single-particle electrical impedance spectroscopy. Complete equivalent circuit analysis is developed to describe the electrical behavior of solid homogeneous microparticles and shelled microcapsules in suspension. The complete circuit model, which includes the resistance of the shell layer and the capacitance of the inner core, has been used to determine the permittivity and conductivity in the shell of single capsules. The PSpice circuit simulations, based on the developed complete circuit models, are used to analyze the experimental data. The relative permittivity of the polyelectrolyte capsule shell is determined to be 50, and the conductivities of the shells of six- and nine-layer microcapsules are estimated to be 28 +/- 6 and 3.3 +/- 1.7 mS m(-1), respectively.

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More information

Published date: 2010
Additional Information: Imported from ISI Web of Science
Organisations: Nanoelectronics and Nanotechnology

Identifiers

Local EPrints ID: 270791
URI: http://eprints.soton.ac.uk/id/eprint/270791
PURE UUID: 09a66595-95b0-42d7-8fcc-543c459ebbe6
ORCID for H Morgan: ORCID iD orcid.org/0000-0003-4850-5676

Catalogue record

Date deposited: 21 Apr 2010 07:45
Last modified: 01 Dec 2017 17:34

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Contributors

Author: T Sun
Author: C Bernabini
Author: H Morgan ORCID iD

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