EHD effects on periodic bubble formation and coalescence in ethanol under non-uniform electric field

2020 ◽  
Vol 215 ◽  
pp. 115451 ◽  
Author(s):  
Wei Zhang ◽  
Junfeng Wang ◽  
Bin Li ◽  
Hailong Liu ◽  
Christian Mulbah ◽  
...  
Keyword(s):  
Electric Field ◽  
Bubble Formation ◽  
Uniform Electric Field

An Alternative Technique for Dielectrophoretic (DEP) Cell Manipulation: Contact-Less DEP

2009 ◽  
Author(s):  
Hadi Shafiee ◽  
Michael B. Sano ◽  
John Caldwell ◽  
Rafael V. Davalos
Keyword(s):  
Electric Field ◽  
Direct Contact ◽  
Bubble Formation ◽  
Practical Method ◽  
Cell Manipulation ◽  
Uniform Electric Field ◽  
Capacitive Behavior ◽  
Sample Enrichment ◽  
Current Sample ◽  
Enrichment Techniques

Dielectrophoresis (DEP), the motion of a particle due to its polarization in the presence of a non-uniform electric field, can be used as an alternative to current sample enrichment techniques [1]. While the technique has been proven effective, most DEP devices must be manufactured using complicated processes. Insulator-based dielectrophoresis (iDEP) is a practical method to obtain the selectivity of dielectrophoresis while overcoming the robustness issues associated with traditional dielectrophoresis platforms [2]. While both of these methods allow for the differentiation of cells based upon their intrinsic electrical properties, they require direct contact between electrodes and a sample fluid, which can induce fouling, bubble formation and unwanted electrochemical effects [3]. We have developed an alternative method to provide the spatially non-uniform electric field required for DEP in which electrodes are not in direct contact with the biological sample. In this method, an electric field is created in the sample microchannel using electrodes inserted into two other microchannels (filled with conductive solution), which are separated from the sample microchannel by thin insulating barriers. These insulating barriers exhibit a capacitive behavior and therefore an electric field can be produced in the main channel by applying an AC field across them. The absence of contact between electrodes and the sample fluid inside the channel prevents bubble formation and avoids any contaminating effects the electrodes may have on the sample.

scholarly journals A Study of Dielectrophoresis-Based Liquid Metal Droplet Control Microfluidic Device

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 340
Author(s):  
Lu Tian ◽  
Zi Ye ◽  
Lin Gui
Keyword(s):  
Liquid Metal ◽  
Electric Field ◽  
Microfluidic Device ◽  
Bubble Formation ◽  
Metal Droplet ◽  
Uniform Electric Field ◽  
Chip Design ◽  
Pdms Film ◽  
Liquid Metal Droplet ◽  
Droplet Control

This study presents a dielectrophoresis-based liquid metal (LM) droplet control microfluidic device. Six square liquid metal electrodes are fabricated beneath an LM droplet manipulation pool. By applying different voltages on the different electrodes, a non-uniform electric field is formed around the LM droplet, and charges are induced on the surface of the droplet accordingly, so that the droplet could be driven inside the electric field. With a voltage of ±1000 V applied on the electrodes, the LM droplets are driven with a velocity of 0.5 mm/s for the 2.0 mm diameter ones and 1.0 mm/s for the 1.0 mm diameter ones. The whole chip is made of PDMS, and microchannels are fabricated by laser ablation. In this device, the electrodes are not in direct contact with the working droplets; a thin PDMS film stays between the electrodes and the driven droplets, preventing Joule heat or bubble formation during the experiments. To enhance the flexibility of the chip design, a gallium-based alloy with melting point of 10.6 °C is used as electrode material in this device. This dielectrophoresis (DEP) device was able to successfully drive liquid metal droplets and is expected to be a flexible approach for liquid metal droplet control.

Bubble Detachment in Variable Gravity Under the Influence of Electric Fields

2002 ◽  
Author(s):  
Cila Herman ◽  
Shinan Chang ◽  
Estelle Iacona
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
High Speed ◽  
Bubble Formation ◽  
Experimental Studies ◽  
Video Camera ◽  
Contact Angles ◽  
Uniform Electric Field ◽  
Bubble Behavior ◽  
Insulating Liquid

The objective of the research is to investigate the behavior of individual air bubbles injected through an orifice into an electrically insulating liquid under the influence of a static electric field. Situations were considered with both uniform and nonuniform electric fields. Bubble formation and detachment were visualized in terrestrial gravity as well as for several levels of reduced gravity (lunar, martian and microgravity) using a high-speed video camera. Bubble volume, dimensions and contact angles at detachment were measured. In addition to the experimental studies, a simple model, predicting bubble characteristics at detachment in an initially uniform electric field was developed. The model, based on thermodynamic considerations, accounts for the level of gravity as well as the magnitude of the uniform electric field. The results of the study indicate that the level of gravity and the electric field magnitude significantly affect bubble behavior as well as shape, volume and dimensions.

Bubble motion in liquid nitrogen under a non-uniform electric field in a microgravity environment

1997 ◽  
Vol 117 (11) ◽  
pp. 1109-1114
Author(s):  
Yoshiyuki Suda ◽  
Kenji Mutoh ◽  
Yosuke Sakai ◽  
Kiyotaka Matsuura ◽  
Norio Homma
Keyword(s):  
Electric Field ◽  
Liquid Nitrogen ◽  
Microgravity Environment ◽  
Uniform Electric Field ◽  
Bubble Motion

Discussion of Electrode Conditioning Mechanism Based on Pre-breakdown Current under Non-uniform Electric Field in Vacuum

2008 ◽  
Vol 128 (12) ◽  
pp. 1445-1451
Author(s):  
Takanori Yasuoka ◽  
Tomohiro Kato ◽  
Katsumi Kato ◽  
Hitoshi Okubo
Keyword(s):  
Electric Field ◽  
Uniform Electric Field

scholarly journals Field Grading Composites Tailored by Electrophoresis — Part 1: Principle and Permittivity Gradient in Uniform Electric Field

2021 ◽  
Vol 28 (2) ◽  
pp. 333-340
Author(s):  
S. Diaham ◽  
Z. Valdez-Nava ◽  
L. Leveque ◽  
T. T. Le ◽  
L. Laudebat ◽  
...  
Keyword(s):  
Electric Field ◽  
Uniform Electric Field
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