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Micromachines
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Advances in Electrowetting Devices, Volume II
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Advances in Electrowetting Devices, Volume II

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "E：Engineering and Technology".

Deadline for manuscript submissions: closed (31 January 2024) | Viewed by 1362

Special Issue Editor

Dr. Sung-Yong Park

E-Mail Website
Guest Editor
Department of Mechanical Engineering, San Diego State University, 5500 Campanile Drive, San Diego, CA 92182, USA
Interests: microfluidics; optofluidics; interfacial science; biofluidics; biophotonics; biological sensors; water/air quality detection; lab on a chip; energy harvesting; solar energy collection and indoor lighting; multi-physics computational simulation; micro/nano fabrication
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Electrowetting has emerged as a new technique with many applications, such as micro-drop generation, manipulation and actuation, sensors, clinical diagnosis, e-paper and electronic display, energy harvesting, beam steering, liquid lenses, and many more. Despite the wide range of application opportunities, the commercialization of electrowetting still faces several challenges, such as charge trapping, oil backflow, contact line instability, dielectric breakdown, reliability in repetitive loading, etc.

This Special Issue aims to inform researchers on the recent advancement of the application of electrowetting techniques, fundamental explanation of related phenomena, development of new material and/or processes, and solution to the challenges of the commercialization of electrowetting devices. This Special Issue is also interested in showcasing a new and novel field of electrowetting applications. The Special Issue will accept diverse forms of contributions, including research papers, communications, methods, and review articles representing the state of the art in electrowetting.

Dr. Sung-Yong Park
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Micromachines is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • electrowetting
  • EWOD
  • contact line modulation
  • AC electrowetting
  • liquid lens
  • droplet manipulation
  • adaptive beam steering
  • laser beam steering
  • electrowetting display
  • biosensors
  • clinical diagnosis
  • dielectric material
  • optofluidics
  • microfluidics
  • MEMS

Published Papers (1 paper)

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Research

16 pages, 2767 KiB  
Article
Optimizing Optical Dielectrophoretic (ODEP) Performance: Position- and Size-Dependent Droplet Manipulation in an Open-Chamber Oil Medium
by Md Aminul Islam and Sung-Yong Park
Micromachines 2024, 15(1), 119; https://doi.org/10.3390/mi15010119 - 11 Jan 2024
Viewed by 997
Abstract
An optimization study is presented to enhance optical dielectrophoretic (ODEP) performance for effective manipulation of an oil-immersed droplet in the floating electrode optoelectronic tweezers (FEOET) device. This study focuses on understanding how the droplet’s position and size, relative to light illumination, affect the [...] Read more.
An optimization study is presented to enhance optical dielectrophoretic (ODEP) performance for effective manipulation of an oil-immersed droplet in the floating electrode optoelectronic tweezers (FEOET) device. This study focuses on understanding how the droplet’s position and size, relative to light illumination, affect the maximum ODEP force. Numerical simulations identified the characteristic length (Lc) of the electric field as a pivotal factor, representing the location of peak field strength. Utilizing 3D finite element simulations, the ODEP force is calculated through the Maxwell stress tensor by integrating the electric field strength over the droplet’s surface and then analyzed as a function of the droplet’s position and size normalized to Lc. Our findings reveal that the optimal position is xopt= Lc+ r, (with r being the droplet radius), while the optimal droplet size is ropt = 5Lc, maximizing light-induced field perturbation around the droplet. Experimental validations involving the tracking of droplet dynamics corroborated these findings. Especially, a droplet sized at r = 5Lc demonstrated the greatest optical actuation by performing the longest travel distance of 13.5 mm with its highest moving speed of 6.15 mm/s, when it was initially positioned at x0= Lc+ r = 6Lc from the light’s center. These results align well with our simulations, confirming the criticality of both the position (xopt) and size (ropt) for maximizing ODEP force. This study not only provides a deeper understanding of the position- and size-dependent parameters for effective droplet manipulation in FEOET systems, but also advances the development of low-cost, disposable, lab-on-a-chip (LOC) devices for multiplexed biological and biochemical analyses. Full article
(This article belongs to the Special Issue Advances in Electrowetting Devices, Volume II)
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