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Characterization of non-spherical polymer particles by combined electrorotation and electroorientation

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
0927-7757
67-71
Morganti, Diego
fc686842-103c-477e-9a4c-926d86c30d78
Morgan, Hywel
de00d59f-a5a2-48c4-a99a-1d5dd7854174
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), 67-71. (doi:10.1016/j.colsurfa.2010.09.031).

Record type: Article

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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More information

Published date: 20 February 2011
Keywords: electrorotation, electroorientation, surface conductance, SU-8
Organisations: Electronics & Computer Science

Identifiers

Local EPrints ID: 354683
URI: https://eprints.soton.ac.uk/id/eprint/354683
ISSN: 0927-7757
PURE UUID: bd6db586-dd57-470e-a49c-44145f23c9bf
ORCID for Hywel Morgan: ORCID iD orcid.org/0000-0003-4850-5676

Catalogue record

Date deposited: 18 Jul 2013 08:29
Last modified: 20 Jul 2019 00:59

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