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Numerical calculation of dielectrophoretic and electrostatic forces acting on micro-scale particles

Numerical calculation of dielectrophoretic and electrostatic forces acting on micro-scale particles
Numerical calculation of dielectrophoretic and electrostatic forces acting on micro-scale particles
Much of the current literature on dielectrophoresis (DEP) relates to micro or nano scale particles; typically in micro-fluidic type experiment geometries. In contrast, this work focusses on the application of DEP forces to larger, micro-scale particles in air. Since DEP scales with particle volume, it can apply a significant force on surprisingly large objects. When using very small particles it is often sufficient to use Pohl’s method [1] whereby the particle is considered to be spherical and where it does not interact with the externally applied electric field. For the larger particles used in this work, the spherical approximation does not necessarily hold. DEP forces are therefore calculated using the finite element method (FEM) which permits the use of arbitrary particle shapes. In this model the electric field is solved in the presence of a polarizable particle, the DEP force is then calculated using the Maxwell stress tensor method [2]. The development of this model allows the investigation of the DEP forces acting on non-spherical particles for a specific experimental electrode geometry.
1.
1742-6588
Praeger, M
84575f28-4530-4f89-9355-9c5b6acc6cac
Li, Z
94aff599-3219-45bf-873a-2219a6b27efa
Smallwood, J
4bf63fe3-e1c3-49b3-b787-6c66824ceccd
Lewin, P
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Praeger, M
84575f28-4530-4f89-9355-9c5b6acc6cac
Li, Z
94aff599-3219-45bf-873a-2219a6b27efa
Smallwood, J
4bf63fe3-e1c3-49b3-b787-6c66824ceccd
Lewin, P
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e

Praeger, M, Li, Z, Smallwood, J and Lewin, P (2015) Numerical calculation of dielectrophoretic and electrostatic forces acting on micro-scale particles. Journal of Physics: Conference Series, 646 (1), [012047]. (doi:10.1088/1742-6596/646/1/012047).

Record type: Article

Abstract

Much of the current literature on dielectrophoresis (DEP) relates to micro or nano scale particles; typically in micro-fluidic type experiment geometries. In contrast, this work focusses on the application of DEP forces to larger, micro-scale particles in air. Since DEP scales with particle volume, it can apply a significant force on surprisingly large objects. When using very small particles it is often sufficient to use Pohl’s method [1] whereby the particle is considered to be spherical and where it does not interact with the externally applied electric field. For the larger particles used in this work, the spherical approximation does not necessarily hold. DEP forces are therefore calculated using the finite element method (FEM) which permits the use of arbitrary particle shapes. In this model the electric field is solved in the presence of a polarizable particle, the DEP force is then calculated using the Maxwell stress tensor method [2]. The development of this model allows the investigation of the DEP forces acting on non-spherical particles for a specific experimental electrode geometry.
1.

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15741_Praeger_15741_corrected.pdf - Accepted Manuscript
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Accepted/In Press date: 1 July 2015
Published date: 26 October 2015
Venue - Dates: Electrostatics 2015, United Kingdom, 2015-04-12 - 2015-04-16
Organisations: EEE

Identifiers

Local EPrints ID: 381177
URI: http://eprints.soton.ac.uk/id/eprint/381177
ISSN: 1742-6588
PURE UUID: b61ffb36-7128-4efc-a13a-f8771d018524

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Date deposited: 02 Sep 2015 12:45
Last modified: 30 Sep 2019 18:48

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Contributors

Author: M Praeger
Author: Z Li
Author: J Smallwood
Author: P Lewin

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