Droplet deformation by AC electric field in a microfluidic channel: the roles of frequency, electrical conductivity and surface tension

2013 ◽

Author(s):

Madhusmita Mishra ◽

Anil Krishna Koduri ◽

Aman Chandra ◽

D. Roy Mahapatra ◽

G. M. Hegde

Keyword(s):

Electric Field ◽

Microfluidic Channel ◽

Cell Lysis ◽

Bacterial Cells ◽

Nano Composite ◽

Time Resolved ◽

Ac Electric Field ◽

Cell Dispersion ◽

Electrical Lysis ◽

Nanocomposite Electrodes

This paper reports on the characterization of an integrated micro-fluidic platform for controlled electrical lysis of biological cells and subsequent extraction of intracellular biomolecules. The proposed methodology is capable of high throughput electrical cell lysis facilitated by nano-composite coated electrodes. The nano-composites are synthesized using Carbon Nanotube and ZnO nanorod dispersion in polymer. Bacterial cells are used to demonstrate the lysis performance of these nanocomposite electrodes. Investigation of electrical lysis in the microchannel is carried out under different parameters, one with continuous DC application and the other under DC biased AC electric field. Lysis in DC field is dependent on optimal field strength and governed by the cell type. By introducing the AC electrical field, the electrokinetics is controlled to prevent cell clogging in the micro-channel and ensure uniform cell dispersion and lysis. Lysis mechanism is analyzed with time-resolved fluorescence imaging which reveal the time scale of electrical lysis and explain the dynamic behavior of GFP-expressing E. coli cells under the electric field induced by nanocomposite electrodes. The DNA and protein samples extracted after lysis are compared with those obtained from a conventional chemical lysis method by using a UV–Visible spectroscopy and fluorimetry. The paper also focuses on the mechanistic understanding of the nano-composite coating material and the film thickness on the leakage charge densities which lead to differential lysis efficiency.

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AC electric field induced droplet deformation in a microfluidic T-junction

Lab on a Chip ◽

10.1039/c6lc00448b ◽

2016 ◽

Vol 16 (16) ◽

pp. 2982-2986 ◽

Cited By ~ 37

Author(s):

Heng-Dong Xi ◽

Wei Guo ◽

Michael Leniart ◽

Zhuang Zhi Chong ◽

Say Hwa Tan

Keyword(s):

Electric Field ◽

Droplet Deformation ◽

Ac Electric Field ◽

Novel Method

We present a novel method for the deformation of droplets in a microfluidic T-junction using an AC electric field.

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Microfluidic Flow Control Using Induced-Charge Electroosmosis

Volume 13: Nano-Manufacturing Technology; and Micro and Nano Systems, Parts A and B ◽

10.1115/imece2008-66620 ◽

2008 ◽

Author(s):

Kendra V. Sharp ◽

Scott M. Davison ◽

Shahrzad H. Yazdi

Keyword(s):

Electric Field ◽

Electroosmotic Flow ◽

Microfluidic Channel ◽

Microfluidic System ◽

Ac Electric Field ◽

Microfluidic Flow ◽

Or Groups ◽

Dc Electric Field ◽

Induced Charge ◽

Fixed Region

Work with dc electrokinetics has demonstrated that is works well for bulk transport of fluid an particles. However, it is difficult to achieve control of individual or groups of particles. This paper investigate the use of induced-charge electroosmosis (ICEO) as a means of providing control over particles within bulk dc electroosmotic flow. ICEO flow develops when an electric double layer is induced by an applied electric field at the surface of a conducting object. Here conducting posts are positioned in a microfluidic channel and ICEO flow develops around them due to an applied ac electric field. A dc electric field is applied across the length of the channel to induce electroosmotic flow past the ICEO region. Around one arrangement of posts the ac and dc flow fields combine to produce a region of recirculation which could be useful for holding a particle or particles within a fixed region of the channel. An alternative arrangement of posts functions to focus the flow into the center of the channel. A numerical model of the system is developed and used to explore means of adapting the ICEO flows to many situations. A method for fabricating a microfluidic system for ICEO flows is presented.

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Complex dielectric permittivity and electrical conductivity of (TlGaSe2)1–х (TlInS2) х solid solutions in an AC electric field

Inorganic Materials ◽

10.1134/s0020168516110108 ◽

2016 ◽

Vol 52 (11) ◽

pp. 1096-1102 ◽

Cited By ~ 2

Author(s):

S. N. Mustafaeva ◽

S. M. Asadov ◽

M. M. Gojaev ◽

A. B. Magerramov

Keyword(s):

Electrical Conductivity ◽

Dielectric Permittivity ◽

Electric Field ◽

Solid Solutions ◽

Complex Dielectric Permittivity ◽

Ac Electric Field

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Electric Field Induced Electrorotation of 2D Perovskite Microplates

Micromachines ◽

10.3390/mi12101228 ◽

2021 ◽

Vol 12 (10) ◽

pp. 1228

Author(s):

Ruifu Zhou ◽

Daobiao Hong ◽

Siyu Gao ◽

Yu Gu ◽

Xuhai Liu

Keyword(s):

Electrical Conductivity ◽

Electric Field ◽

External Electric Field ◽

High Speed ◽

Electric Field Distribution ◽

Physical Simulation ◽

Electrode System ◽

Maximum Speed ◽

Two Dimensional ◽

Ac Electric Field

High precision-controlled movement of microscale devices is crucial to obtain advanced miniaturized motors. In this work, we report a high-speed rotating micromotor based on two-dimensional (2D) all-inorganic perovskite CsPbBr3 microplates controlled via alternating-current (AC) external electric field. Firstly, the device configuration with optimized electric field distribution has been determined via systematic physical simulation. Using this optimized biasing configuration, when an AC electric field is applied at the four-electrode system, the microplates suspended in the tetradecane solution rotate at a speed inversely proportional to AC frequency, with a maximum speed of 16.4 × 2π rad/s. Furthermore, the electrical conductivity of CsPbBr3 microplates has been determined in a contactless manner, which is approximately 10−9–10−8 S/m. Our work has extended the investigations on AC electric field-controlled micromotors from 1D to 2D scale, shedding new light on developing micromotors with new configuration.

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Analytical study of electromagnetic ion cyclotron wave for ring distribution with AC electric field in Saturn magnetosphere

Journal of Physics Conference Series ◽

10.1088/1742-6596/1817/1/012020 ◽

2021 ◽

Vol 1817 (1) ◽

pp. 012020

Author(s):

Neeta Kumari Shukla ◽

Devi Singh ◽

R.S. Pandey

Keyword(s):

Electric Field ◽

Analytical Study ◽

Ac Electric Field ◽

Ion Cyclotron

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Simulation of TiO 2 particle trajectory in AC electric field

Computational Materials Science ◽

10.1016/j.commatsci.2015.06.035 ◽

2015 ◽

Vol 108 ◽

pp. 183-191 ◽

Cited By ~ 2

Author(s):

Reza Riahifar ◽

Babak Raissi ◽

Cyrus Zamani ◽

Ehsan Marzbanrad

Keyword(s):

Electric Field ◽

Particle Trajectory ◽

Ac Electric Field

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Investigating flexible textile-based coils for wireless charging wearable electronics

Journal of Industrial Textiles ◽

10.1177/1528083719831086 ◽

2019 ◽

Vol 50 (3) ◽

pp. 333-345 ◽

Cited By ~ 2

Author(s):

Danmei Sun ◽

Meixuan Chen ◽

Symon Podilchak ◽

Apostolos Georgiadis ◽

Qassim S Abdullahi ◽

...

Keyword(s):

Magnetic Field ◽

Electrical Conductivity ◽

Electromagnetic Field ◽

Electric Field ◽

Dimensional Stability ◽

Screen Printing ◽

Wearable Electronics ◽

Wireless Charging ◽

The Magnetic Field ◽

Screen Printed

Smart and interactive textiles have been attracted great attention in recent years. This research explored three different techniques and processes in developing textile-based conductive coils that are able to embed in a garment layer. Coils made through embroidery and screen printing have good dimensional stability, although the resistance of screen printed coil is too high due to the low conductivity of the print ink. Laser cut coil provided the best electrical conductivity; however, the disadvantage of this method is that it is very difficult to keep the completed coil to the predetermined shape and dimension. The tested results show that an electromagnetic field has been generated between the textile-based conductive coil and an external coil that is directly powered by electricity. The magnetic field and electric field worked simultaneously to complete the wireless charging process.

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