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Surfactant concentration modulates the motion and placement of microparticles in an inhomogeneous electric field

This study examined the effects of surfactants on the motion and positioning of microparticles in an inhomogeneous electric field. The microparticles were suspended in oil with a surfactant and the electric field was generated using sawtooth-patterned electrodes. The microparticles were trapped, osc...

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Detalles Bibliográficos
Autores principales: Masukawa, Marcos K., Hayakawa, Masayuki, Takinoue, Masahiro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9050010/
https://www.ncbi.nlm.nih.gov/pubmed/35496525
http://dx.doi.org/10.1039/d0ra00703j
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author Masukawa, Marcos K.
Hayakawa, Masayuki
Takinoue, Masahiro
author_facet Masukawa, Marcos K.
Hayakawa, Masayuki
Takinoue, Masahiro
author_sort Masukawa, Marcos K.
collection PubMed
description This study examined the effects of surfactants on the motion and positioning of microparticles in an inhomogeneous electric field. The microparticles were suspended in oil with a surfactant and the electric field was generated using sawtooth-patterned electrodes. The microparticles were trapped, oscillating, or attached to the electrodes. The proportion of microparticles in each state was defined by the concentration of surfactant and the voltage applied to the electrodes. Based on the trajectory of the microparticles in the electric field, we developed a new physical model in which the surfactant adsorbed on the microparticles allowed the microparticles to be charged by contact with the electrodes, with either positive or negative charges, while the non-adsorbed surfactant micellizing in the oil contributed to charge relaxation. A simulation based on this model showed that the charging and charge relaxation, as modulated by the surfactant concentration, can explain the trajectories and proportion of the trapped, oscillating, and attached microparticles. These results will be useful for the development of novel self-assembly and transport technologies and colloids sensitive to electricity.
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spelling pubmed-90500102022-04-29 Surfactant concentration modulates the motion and placement of microparticles in an inhomogeneous electric field Masukawa, Marcos K. Hayakawa, Masayuki Takinoue, Masahiro RSC Adv Chemistry This study examined the effects of surfactants on the motion and positioning of microparticles in an inhomogeneous electric field. The microparticles were suspended in oil with a surfactant and the electric field was generated using sawtooth-patterned electrodes. The microparticles were trapped, oscillating, or attached to the electrodes. The proportion of microparticles in each state was defined by the concentration of surfactant and the voltage applied to the electrodes. Based on the trajectory of the microparticles in the electric field, we developed a new physical model in which the surfactant adsorbed on the microparticles allowed the microparticles to be charged by contact with the electrodes, with either positive or negative charges, while the non-adsorbed surfactant micellizing in the oil contributed to charge relaxation. A simulation based on this model showed that the charging and charge relaxation, as modulated by the surfactant concentration, can explain the trajectories and proportion of the trapped, oscillating, and attached microparticles. These results will be useful for the development of novel self-assembly and transport technologies and colloids sensitive to electricity. The Royal Society of Chemistry 2020-03-02 /pmc/articles/PMC9050010/ /pubmed/35496525 http://dx.doi.org/10.1039/d0ra00703j Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/
spellingShingle Chemistry
Masukawa, Marcos K.
Hayakawa, Masayuki
Takinoue, Masahiro
Surfactant concentration modulates the motion and placement of microparticles in an inhomogeneous electric field
title Surfactant concentration modulates the motion and placement of microparticles in an inhomogeneous electric field
title_full Surfactant concentration modulates the motion and placement of microparticles in an inhomogeneous electric field
title_fullStr Surfactant concentration modulates the motion and placement of microparticles in an inhomogeneous electric field
title_full_unstemmed Surfactant concentration modulates the motion and placement of microparticles in an inhomogeneous electric field
title_short Surfactant concentration modulates the motion and placement of microparticles in an inhomogeneous electric field
title_sort surfactant concentration modulates the motion and placement of microparticles in an inhomogeneous electric field
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9050010/
https://www.ncbi.nlm.nih.gov/pubmed/35496525
http://dx.doi.org/10.1039/d0ra00703j
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