Cargando…

Capacitance Effects of a Hydrophobic-Coated Ion Gel Dielectric on AC Electrowetting

We present experimental studies of alternating current (AC) electrowetting dominantly influenced by several unique characteristics of an ion gel dielectric in its capacitance. At a high-frequency region above 1 kHz, the droplet undergoes the contact angle modification. Due to its high-capacitance ch...

Descripción completa

Detalles Bibliográficos
Autores principales: Lee, Taewoo, Park, Sung-Yong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8003088/
https://www.ncbi.nlm.nih.gov/pubmed/33803719
http://dx.doi.org/10.3390/mi12030320
_version_ 1783671607499161600
author Lee, Taewoo
Park, Sung-Yong
author_facet Lee, Taewoo
Park, Sung-Yong
author_sort Lee, Taewoo
collection PubMed
description We present experimental studies of alternating current (AC) electrowetting dominantly influenced by several unique characteristics of an ion gel dielectric in its capacitance. At a high-frequency region above 1 kHz, the droplet undergoes the contact angle modification. Due to its high-capacitance characteristic, the ion gel allows the contact angle change as large as Δθ = 26.4°, more than 2-fold improvement, compared to conventional dielectrics when f = 1 kHz. At the frequency range from 1 to 15 kHz, the capacitive response of the gel layer dominates and results in a nominal variation in the angle change as θ ≈ 90.9°. Above 15 kHz, such a capacitive response of the gel layer sharply decreases and leads to the drastic increase in the contact angle. At a low-frequency region below a few hundred Hz, the droplet’s oscillation relying on the AC frequency applied was mainly observed and oscillation performance was maximized at corresponding resonance frequencies. With the high-capacitance feature, the ion gel significantly enlarges the oscillation performance by 73.8% at the 1st resonance mode. The study herein on the ion gel dielectric will help for various AC electrowetting applications with the benefits of mixing enhancement, large contact angle modification, and frequency-independent control.
format Online
Article
Text
id pubmed-8003088
institution National Center for Biotechnology Information
language English
publishDate 2021
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-80030882021-03-28 Capacitance Effects of a Hydrophobic-Coated Ion Gel Dielectric on AC Electrowetting Lee, Taewoo Park, Sung-Yong Micromachines (Basel) Article We present experimental studies of alternating current (AC) electrowetting dominantly influenced by several unique characteristics of an ion gel dielectric in its capacitance. At a high-frequency region above 1 kHz, the droplet undergoes the contact angle modification. Due to its high-capacitance characteristic, the ion gel allows the contact angle change as large as Δθ = 26.4°, more than 2-fold improvement, compared to conventional dielectrics when f = 1 kHz. At the frequency range from 1 to 15 kHz, the capacitive response of the gel layer dominates and results in a nominal variation in the angle change as θ ≈ 90.9°. Above 15 kHz, such a capacitive response of the gel layer sharply decreases and leads to the drastic increase in the contact angle. At a low-frequency region below a few hundred Hz, the droplet’s oscillation relying on the AC frequency applied was mainly observed and oscillation performance was maximized at corresponding resonance frequencies. With the high-capacitance feature, the ion gel significantly enlarges the oscillation performance by 73.8% at the 1st resonance mode. The study herein on the ion gel dielectric will help for various AC electrowetting applications with the benefits of mixing enhancement, large contact angle modification, and frequency-independent control. MDPI 2021-03-18 /pmc/articles/PMC8003088/ /pubmed/33803719 http://dx.doi.org/10.3390/mi12030320 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) ).
spellingShingle Article
Lee, Taewoo
Park, Sung-Yong
Capacitance Effects of a Hydrophobic-Coated Ion Gel Dielectric on AC Electrowetting
title Capacitance Effects of a Hydrophobic-Coated Ion Gel Dielectric on AC Electrowetting
title_full Capacitance Effects of a Hydrophobic-Coated Ion Gel Dielectric on AC Electrowetting
title_fullStr Capacitance Effects of a Hydrophobic-Coated Ion Gel Dielectric on AC Electrowetting
title_full_unstemmed Capacitance Effects of a Hydrophobic-Coated Ion Gel Dielectric on AC Electrowetting
title_short Capacitance Effects of a Hydrophobic-Coated Ion Gel Dielectric on AC Electrowetting
title_sort capacitance effects of a hydrophobic-coated ion gel dielectric on ac electrowetting
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8003088/
https://www.ncbi.nlm.nih.gov/pubmed/33803719
http://dx.doi.org/10.3390/mi12030320
work_keys_str_mv AT leetaewoo capacitanceeffectsofahydrophobiccoatediongeldielectriconacelectrowetting
AT parksungyong capacitanceeffectsofahydrophobiccoatediongeldielectriconacelectrowetting