Scattering of Metal Colloids by a Circular Post under Electric Fields
We consider the scattering of metal colloids in aqueous solutions by an insulating circular post under the action of an AC electric field. We analyze the effects on the particle of several forces of electrical origin: the repulsion between the induced dipole of the particle and its image dipole in t...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-12-01
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| Series: | Micromachines |
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| Online Access: | https://www.mdpi.com/2072-666X/14/1/23 |
| _version_ | 1797438633828941824 |
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| author | José Eladio Flores-Mena Pablo García-Sánchez Antonio Ramos |
| author_facet | José Eladio Flores-Mena Pablo García-Sánchez Antonio Ramos |
| author_sort | José Eladio Flores-Mena |
| collection | DOAJ |
| description | We consider the scattering of metal colloids in aqueous solutions by an insulating circular post under the action of an AC electric field. We analyze the effects on the particle of several forces of electrical origin: the repulsion between the induced dipole of the particle and its image dipole in the post, the hydrodynamic interaction with the post due to the induced-charge electroosmotic (ICEO) flow around the particle, and the dielectrophoresis arising from the distortion of the applied electric field around the post. The relative influence of these forces is discussed as a function of frequency of the AC field, particle size and distance to the post. We perform numerical simulations of the scattering of the metal colloid by the insulating circular post flowing in a microchannel and subjected to alternating current electric fields. Our simulation results show that the maximum particle deviation is found for an applied electric field parallel to the flow direction. The deviation is also greater at low electric field frequencies, corresponding to the regime in which the ICEO’s interaction with the post is predominant over other mechanisms. |
| first_indexed | 2024-03-09T11:40:53Z |
| format | Article |
| id | doaj.art-0bbc160759234c999e7801ec2aa75a7b |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-03-09T11:40:53Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Micromachines |
| spelling | doaj.art-0bbc160759234c999e7801ec2aa75a7b2023-11-30T23:32:09ZengMDPI AGMicromachines2072-666X2022-12-011412310.3390/mi14010023Scattering of Metal Colloids by a Circular Post under Electric FieldsJosé Eladio Flores-Mena0Pablo García-Sánchez1Antonio Ramos2Facultad de Ciencias de la Electrónica, Benemérita Universidad Autónoma de Puebla, Av. San Claudio y 18 Sur, San Manuel, CU. FCE2, Puebla 72570, MexicoDepartamento Electrónica y Electromagnetismo, Facultad de Física, Universidad de Sevilla, Avda. Reina Mercedes s/n, 41012 Sevilla, SpainDepartamento Electrónica y Electromagnetismo, Facultad de Física, Universidad de Sevilla, Avda. Reina Mercedes s/n, 41012 Sevilla, SpainWe consider the scattering of metal colloids in aqueous solutions by an insulating circular post under the action of an AC electric field. We analyze the effects on the particle of several forces of electrical origin: the repulsion between the induced dipole of the particle and its image dipole in the post, the hydrodynamic interaction with the post due to the induced-charge electroosmotic (ICEO) flow around the particle, and the dielectrophoresis arising from the distortion of the applied electric field around the post. The relative influence of these forces is discussed as a function of frequency of the AC field, particle size and distance to the post. We perform numerical simulations of the scattering of the metal colloid by the insulating circular post flowing in a microchannel and subjected to alternating current electric fields. Our simulation results show that the maximum particle deviation is found for an applied electric field parallel to the flow direction. The deviation is also greater at low electric field frequencies, corresponding to the regime in which the ICEO’s interaction with the post is predominant over other mechanisms.https://www.mdpi.com/2072-666X/14/1/23AC electrokineticsmicrofluidicsinduced-charge electroosmosisdielectrophoresis |
| spellingShingle | José Eladio Flores-Mena Pablo García-Sánchez Antonio Ramos Scattering of Metal Colloids by a Circular Post under Electric Fields Micromachines AC electrokinetics microfluidics induced-charge electroosmosis dielectrophoresis |
| title | Scattering of Metal Colloids by a Circular Post under Electric Fields |
| title_full | Scattering of Metal Colloids by a Circular Post under Electric Fields |
| title_fullStr | Scattering of Metal Colloids by a Circular Post under Electric Fields |
| title_full_unstemmed | Scattering of Metal Colloids by a Circular Post under Electric Fields |
| title_short | Scattering of Metal Colloids by a Circular Post under Electric Fields |
| title_sort | scattering of metal colloids by a circular post under electric fields |
| topic | AC electrokinetics microfluidics induced-charge electroosmosis dielectrophoresis |
| url | https://www.mdpi.com/2072-666X/14/1/23 |
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