Special Issue "Electrokinetics in Micro-/nanofluidic Devices"

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "C:Chemistry".

Deadline for manuscript submissions: 1 August 2020.

Special Issue Editor

Prof. Sung Jae Kim
E-Mail Website
Guest Editor
Department of Electrical and Computer Engineering, Seoul National University, South Korea
Tel. +82-2-880-1665
Interests: nanoscale electrokinetics; ion concentration polarization; BioMEMS/NEMS; desalination/purification; molecular preconcentration; nanoabrication

Special Issue Information

Dear Colleagues,

Since soil scientists discovered electroosmosis and electrophoresis in packed soil under a DC electric field 200 years ago, electrokinetics has been actively studied and has provided a firm basis of splendid advancements for biomedical, environmental and energy applications. With the recent aid of micro-/nano-fabrication technologies, a number of new electrokinetic phenomena have been demonstrated using micro-/nano-fluidic platforms and directly applied for a new process that has never been achieved. This Special Issue will focus on the recent advancements of new electrokinetic phenomena in micro-/nano-fluidic devices, including fundamentals, various applications and fabrication technologies by soliciting showcase research papers, short communications, and perspective review articles. The main idea is to stimulate the community and to provide a unique collection of insightful works.

Prof. Sung Jae Kim
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 papers will be 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 1600 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

  • Electrokinetics
  • Electrical double layer
  • Microfluidics
  • Nanofluidics
  • Nanofabrication
  • Membrane
  • Sample preparation

Published Papers (2 papers)

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Research

Open AccessArticle
A Liquid-Metal-Based Dielectrophoretic Microdroplet Generator
Micromachines 2019, 10(11), 769; https://doi.org/10.3390/mi10110769 - 11 Nov 2019
Abstract
This paper proposes a novel microdroplet generator based on the dielectrophoretic (DEP) force. Unlike the conventional continuous microfluidic droplet generator, this droplet generator is more like “invisible electric scissors”. It can cut the droplet off from the fluid matrix and modify droplets’ length [...] Read more.
This paper proposes a novel microdroplet generator based on the dielectrophoretic (DEP) force. Unlike the conventional continuous microfluidic droplet generator, this droplet generator is more like “invisible electric scissors”. It can cut the droplet off from the fluid matrix and modify droplets’ length precisely by controlling the electrodes’ length and position. These electrodes are made of liquid metal by injection. By applying a certain voltage on the liquid-metal electrodes, the electrodes generate an uneven electric field inside the main microfluidic channel. Then, the uneven electric field generates DEP force inside the fluid. The DEP force shears off part from the main matrix, in order to generate droplets. To reveal the mechanism, numerical simulations were performed to analyze the DEP force. A detailed experimental parametric study was also performed. Unlike the traditional droplet generators, the main separating force of this work is DEP force only, which can produce one droplet at a time in a more precise way. Full article
(This article belongs to the Special Issue Electrokinetics in Micro-/nanofluidic Devices)
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Open AccessArticle
A Driving System for Fast and Precise Gray-Scale Response Based on Amplitude–Frequency Mixed Modulation in TFT Electrowetting Displays
Micromachines 2019, 10(11), 732; https://doi.org/10.3390/mi10110732 - 29 Oct 2019
Abstract
The gray-scale display which is driven by PWM (pulse width modulation) in TFT (thin film transistor) electrowetting displays (EWDs) has some shortcomings, such as large amplitude of oil oscillation in pixels and slow response speed for displaying gray scale. In this paper, an [...] Read more.
The gray-scale display which is driven by PWM (pulse width modulation) in TFT (thin film transistor) electrowetting displays (EWDs) has some shortcomings, such as large amplitude of oil oscillation in pixels and slow response speed for displaying gray scale. In this paper, an amplitude–frequency mixed modulation driving system is proposed to improve the response speed of driving gray scale and enhance the oil stability when the gray scale is displayed. In the initial stage of the driving process, the oil is driven by a high voltage to close to the target luminance, and the driving voltage is then decreased to stabilize the oil. The electrowetting hysteresis curve was used to calculate the relation model between the driving voltage and the luminance of the pixel in the system, and the driving voltage value of the pixel at each driving stage was then set to make the oil precisely and rapidly stabilize at the target luminance value. In the output driving platform, the amplitude–frequency mixed modulation is realized based on the source IC, which was used to realize digital-to-analog conversion. An 8 inch EWD was tested using an Admesy colorimeter, and the experimental results show that the pixel response time is reduced by 70% and the gray-scale oscillation is reduced by 80%. Full article
(This article belongs to the Special Issue Electrokinetics in Micro-/nanofluidic Devices)
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