Characterization of non-spherical polymer particles by combined electrorotation and electroorientation
Characterization of non-spherical polymer particles by combined electrorotation and electroorientation
The electrokinetic properties of non-spherical polymer particles made of SU-8 were characterised by electrorotation (ROT) and electroorientation (EO). Particles with different surface chemistries were analysed. Rod-shaped SU-8 particles were fabricated and chemically modified to produce different surface functionalities. Both ROT and EO spectra were measured for the same particle. The data were analysed to provide values for the surface conductance and permittivity of the particles. For unmodified SU-8 particles the surface conductance was estimated in 0.48 nS, lower than the typical value of 1 nS published for latex spheres. The relative permittivity was estimated as 9.8, suggesting the presence of water in the polymer matrix.
electrorotation, electroorientation, surface conductance, SU-8
67-71
Morganti, Diego
fc686842-103c-477e-9a4c-926d86c30d78
Morgan, Hywel
de00d59f-a5a2-48c4-a99a-1d5dd7854174
20 February 2011
Morganti, Diego
fc686842-103c-477e-9a4c-926d86c30d78
Morgan, Hywel
de00d59f-a5a2-48c4-a99a-1d5dd7854174
Morganti, Diego and Morgan, Hywel
(2011)
Characterization of non-spherical polymer particles by combined electrorotation and electroorientation.
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 376 (1-3), .
(doi:10.1016/j.colsurfa.2010.09.031).
Abstract
The electrokinetic properties of non-spherical polymer particles made of SU-8 were characterised by electrorotation (ROT) and electroorientation (EO). Particles with different surface chemistries were analysed. Rod-shaped SU-8 particles were fabricated and chemically modified to produce different surface functionalities. Both ROT and EO spectra were measured for the same particle. The data were analysed to provide values for the surface conductance and permittivity of the particles. For unmodified SU-8 particles the surface conductance was estimated in 0.48 nS, lower than the typical value of 1 nS published for latex spheres. The relative permittivity was estimated as 9.8, suggesting the presence of water in the polymer matrix.
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Published date: 20 February 2011
Keywords:
electrorotation, electroorientation, surface conductance, SU-8
Organisations:
Electronics & Computer Science
Identifiers
Local EPrints ID: 354683
URI: http://eprints.soton.ac.uk/id/eprint/354683
ISSN: 0927-7757
PURE UUID: bd6db586-dd57-470e-a49c-44145f23c9bf
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Date deposited: 18 Jul 2013 08:29
Last modified: 15 Mar 2024 03:18
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Author:
Diego Morganti
Author:
Hywel Morgan
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