Measuring the frequency dependent polarisability of colloidal particles from dielectrophoretic collection data
Measuring the frequency dependent polarisability of colloidal particles from dielectrophoretic collection data
In a non-uniform ac electric field, dipole forces cause polarizable particles to experience ponderomotive forces. The particle velocity is a function of the dielectric properties of the particle, the suspending medium, particle volume and the electric field gradient. Measurement of the collection rate of particles can be used to estimate their dielectric polarizability. In this work we have measured the collection rate of sub-micrometer particles collecting at the edges of a planar interdigitated electrode array. The Fokker-Planck equation was used to simulate the spatial and temporal accumulation of particles at the electrodes. The experimental data shows that the collection rate decreases with increasing frequency of the applied field, in agreement with the predicted frequency-dependent reduction in the effective polarizability of the particles. Numerical simulations are in broad agreement with experimental results
566-571
Bakewell, D. J
4def9ba6-3c9a-466d-8148-e4970bd433f4
Morgan, Hywel
de00d59f-a5a2-48c4-a99a-1d5dd7854174
June 2001
Bakewell, D. J
4def9ba6-3c9a-466d-8148-e4970bd433f4
Morgan, Hywel
de00d59f-a5a2-48c4-a99a-1d5dd7854174
Bakewell, D. J and Morgan, Hywel
(2001)
Measuring the frequency dependent polarisability of colloidal particles from dielectrophoretic collection data.
IEEE Transactions on Dielectrics & Electrical Insulation, 8 (3), .
Abstract
In a non-uniform ac electric field, dipole forces cause polarizable particles to experience ponderomotive forces. The particle velocity is a function of the dielectric properties of the particle, the suspending medium, particle volume and the electric field gradient. Measurement of the collection rate of particles can be used to estimate their dielectric polarizability. In this work we have measured the collection rate of sub-micrometer particles collecting at the edges of a planar interdigitated electrode array. The Fokker-Planck equation was used to simulate the spatial and temporal accumulation of particles at the electrodes. The experimental data shows that the collection rate decreases with increasing frequency of the applied field, in agreement with the predicted frequency-dependent reduction in the effective polarizability of the particles. Numerical simulations are in broad agreement with experimental results
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Published date: June 2001
Organisations:
Nanoelectronics and Nanotechnology
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Local EPrints ID: 266489
URI: http://eprints.soton.ac.uk/id/eprint/266489
ISSN: 1070-9878
PURE UUID: df1a46f7-c9b4-4113-8df7-5fa00d032c9a
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Date deposited: 03 Aug 2008 22:19
Last modified: 08 Jan 2022 02:59
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Author:
D. J Bakewell
Author:
Hywel Morgan
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