Influences of electric field on living cells in a charged water-in-oil droplet under electrophoretic actuation

Im, Do Jin; Noh, Jihoon; Yi, Nam Woo; Park, Jaesung; Kang, In Seok

doi:10.1063/1.3665222

Cited by 36 publications

(28 citation statements)

References 22 publications

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“…에서 활발히 연구되고 있다 [1][2][3][4][5][6][7][8][9][10][11][12]. 액적 접촉충전 현상 기반의 미세 유체 기술은 개별 액적을 전기를 이용해 다루는 디지털 미세유체 기 술의 한 분야로 [13,14], 채널 내 액적을 다루는 액적 미세유체 (Droplet Microfluidics) [15,16] 기술과는 다르며 기존 미세유체 기술 들의 단점을 극복할 수 있어 새로운 대안 기술로 제시되고 있는 신 기술 이다 [17,18].…”

Section: 서 론 최근 새로운 미세유체 기술로써 액적 접촉충전 현상이 여러 분야unclassified

Contact Charging and Electrphoresis of a Glassy Carbon Microsphere

Choi¹,

Im²

2016

Korean Chemical Engineering Research

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− We investigated the charging characteristics of a conducting solid sphere (glassy carbon sphere) comparing with that of a water droplet and check the applicability of the perfect conductor theory. For the systematic research, sphere size, applied voltages, viscosity of the medium were changed and the results were compared with that of corresponding water droplets and the perfect conductor theory. Basically, a glassy carbon sphere follows the perfect conductor theory but the charging amount was lower as much as 70~80% of theoretical prediction value due to oil film formed between electrode and a carbon sphere. We hope this result provides basic understandings on the solid sphere contact charging phenomenon and related applications.

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Section: 서 론 최근 새로운 미세유체 기술로써 액적 접촉충전 현상이 여러 분야unclassified

Contact Charging and Electrphoresis of a Glassy Carbon Microsphere

Choi¹,

Im²

2016

Korean Chemical Engineering Research

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“…In its simplest form, CCEP results in the continuous oscillatory motion of a spherical particle 2-4 (or droplet [5][6][7][8][9][10][11] ) between two parallel electrodes subject to a constant voltage (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Charge and force on a conductive sphere between two parallel electrodes: A Stokesian dynamics approach

Drews

Kowalik

Bishop

2014

Journal of Applied Physics

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We present an accurate and efficient method to compute the electrostatic charge and force on a conductive sphere between two parallel electrodes. The method relies on a Stokesian dynamics-like approach, in which the capacitance tensor is divided into two contributions: (1) a far field contribution that captures the long range, many body interactions between the sphere and the two electrodes and (2) a near field contribution that captures the pairwise interactions between nearly contacting surfaces. The accuracy of this approach is confirmed by comparison to "exact" numerical results obtained by finite element modeling. From the capacitance tensor, we derive the charge and dipole moment on the sphere, the electrostatic free energy of the system, and the electrostatic force on the sphere. These quantities are used to describe the dynamics of micron-scale particles oscillating within a viscous dielectric liquid between two parallel electrodes subject to constant voltage. Simulated particle trajectories agree quantitatively with those captured experimentally by high speed imaging. V C 2014 AIP Publishing LLC. [http://dx.

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“…Pipette tip manufacturers have only reported that the static charge caused by the triboelectric effect between pipette tips and their rack can cause the tips to adhere to a robotic instrument's head in automated systems4. Recently, our group observed the presence of charge on a dispensed droplet and did not know from where the charge is originated56.…”

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confidence: 99%

Spontaneous electrical charging of droplets by conventional pipetting

Choi

Lee

et al. 2013

Sci Rep

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172

141

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We report that a droplet dispensed from a micropipette almost always has a considerable electrical charge of a magnitude dependent on the constituents of the droplet, on atmospheric humidity and on the coating material of pipette tip. We show that this natural electrification of a droplet originates from the charge separation between a droplet and pipette tip surface by contact with water due to the ionization of surface chemical groups. Charge on a droplet can make it difficult to detach the droplet from the pipette tip, can decrease its surface tension, can affect the chemical characteristics of solutions due to interactions with charged molecules, and can influence the combination and localization of charged bio-molecules; in all cases, the charge may affect results of experiments in which any of these factors is important. Thus, these findings reveal experimental parameters that should be controlled in experiments that use micropipettes.

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Influences of electric field on living cells in a charged water-in-oil droplet under electrophoretic actuation

Cited by 36 publications

References 22 publications

Contact Charging and Electrphoresis of a Glassy Carbon Microsphere

Contact Charging and Electrphoresis of a Glassy Carbon Microsphere

Charge and force on a conductive sphere between two parallel electrodes: A Stokesian dynamics approach

Spontaneous electrical charging of droplets by conventional pipetting

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