AC electrokinetic pumping of liquids using arrays of microelectrodes

Ramos, António; García, Pablo Pérez; González-Weller, Dailos; Castellanos, A.; Morgan, Hywel; Green, Nicolas G.

doi:10.1117/12.608236

Cited by 8 publications

(3 citation statements)

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“…The pumping rate is proportional to the forth power of the applied voltages in the form of $u \propto \sigma V_{{{\rm rms}}}^{4}$ . The maximum temperature rise is proportional to the voltage square and medium conductivity, agreeing with the theoretical estimation of ${{\sigma V_{{{\rm rms}}}^{2} }/k}$ by Ramos et al 21. The maximum temperature rise for the presented structure is then approximated to be up to 7 K, which is of the same order of the simulated result.…”

Section: Simulation Results and Discussionsupporting

confidence: 88%

“…AC electrokinetic phenomena in microfluidics are investigated widely for their capacity in fluidic pumping under different conditions 21–25 among which AC electro‐osmosis and AC electrothermal (AC ET) effects are the two main approaches 26. AC electro‐osmosis is a surface effect where a slip fluidic velocity occurs due to the interaction of electric field and the double layer over the electrode surfaces.…”

Section: Introductionmentioning

confidence: 99%

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Colorectal

2005

British Journal of Surgery

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Amyloidfibrillen sind außergewöhnlich stabile faserförmige Aggregate aus Peptiden und Proteinen, die mit neurodegenerativen Erkrankungen in Verbindung gebracht werden. M. Zweckstetter et al. demonstrieren in ihrer Zuschrift auf dass Amyloidfibrillen aus dem Protein α‐Synuclein, das an der Parkinson‐Krankheit beteiligt sein soll, in unterkühltem Wasser bei −15 °C schnell denaturiert werden; ihre Dissoziation und die Lockerung der Proteinkonformation finden also unter Bedingungen statt, bei denen viele globuläre Proteine gefaltet bleiben.

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Section: Simulation Results and Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Colorectal

2005

British Journal of Surgery

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“…Furthermore, the effect of several parameters and pumping configurations were investigated, such as studying the effect of channel height, electrochemical reactions, and non-linear surface capacitance of the Debye layer (Olesen, Bruus, & Ajdari, 2006); controlling the pumping direction by switching the voltage using an inclined electrode array (Hilber, Weiss, Saeed, Holly, & Jakoby, 2009;Loucaides, Ramos, & Georghiou, 2007), pumping of two different electrolytes simultaneously through microchannels (Morgan, Green, Ramos, & García-Sánchez, 2007), bubble-free pumping (Kuo & Liu, 2008;Tawfik & Diez, 2017) as well as ACEO pumping using biased AC/DC signals (Islam & Reyna, 2012;Lian & Wu, 2009;Piñón et al, 2017;Jie Wu, 2008;Yang Ng, Ramos, Cheong Lam, & Rodriguez, 2012), pulse voltage waveforms (Tawfik & Diez, 2017), square pole-slit electrode arrays (Yoshida, Sato, Eom, Kim, & Yokota, 2017), and arrays of asymmetric ring electrode pairs in the cylindrical microchannels (Gao & Li, 2018). Also, the comparison between fluid velocity on arrays of identical electrodes with AC voltage and a traveling-wave potential demonstrated that traveling-wave potential resulted in a higher fluid velocity (Ramos et al, 2005;Yang, Jiang, Ramos, & García-Sánchez, 2009). Besides using a planar array of electrodes, Urbanski et al (Urbanski, Thorsen, Levitan, & Bazant, 2006) introduced the first nonplanar ACEO pump by using three-dimensional (3D) stepped electrodes.…”

Section: Icek Micropumpsmentioning

confidence: 99%

Induced-charge electrokinetic (ICEK) development and applications in microfluidics

Manshadi¹,

Mohammadi²,

Zarei³

et al.

Authorea

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Applying an external electric field over a polarizable electrode or object within microchannels can induce an electric double layer (EDL) around channel walls and create induced-charge electrokinetics (ICEK) within channels. The primary consequence of the induced charge is the generation of micro-vortices around the polarizable electrode or object, presenting a great potential for various microfluidic applications. This review presents the advances in theoretical, numerical and experimental studies on the physics and applications of ICEK within microfluidics. In particular, the characteristics and performance of ICEK-based microfluidic components in active micromixers, micropumps, and microvalves are critically reviewed, followed by discussing the applications of ICEK in electrophoresis and particle/cell manipulation within microfluidics. Furthermore, the opportunities and challenges of ICEK-based microfluidic devices are highlighted. This work facilitates in recognizing deliverable ICEK-based microfluidic technologies with unprecedented functionality for the next generation of biomedical applications with predictable manufacturability and functionality.

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Electrohydrodynamic‐mediated dielectrophoretic separation and transport based on asymmetric electrode pairs

Manoochehri

2008

Electrophoresis

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This paper presents a system for continuous separation and transport of micron and submicron particles in fluidic environment based on dielectrophoretic fractionation in concert with AC electrothermal (AC ET)-induced fluidic pumping action. In this system, high frequency AC signals are used to energize asymmetric electrode pairs. AC ET-driven fluidic pumping is utilized as an alternative to the commonly used external pressure-driven fluid flow. Distinct collection sites for negative-dielectrophoretic and positive-dielectrophoretic particle populations are identified. The coupling effects of dielectrophoretic force and viscous drag from AC ET fluid flow on particle motions are investigated theoretically and numerically. We demonstrate that these two forces can be efficiently coupled to achieve continuous separation and transport of particle mixture in a fluidic medium when the dielectric properties of the particles and the fluidic environment are different. The combination of dielectrophoretic separation and AC ET pumping function provides a promising approach to further miniaturize and integrate these mechanisms into lab-on-chip devices.

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AC electrokinetic pumping of liquids using arrays of microelectrodes

Cited by 8 publications

References 0 publications

Colorectal

Colorectal

Induced-charge electrokinetic (ICEK) development and applications in microfluidics

Electrohydrodynamic‐mediated dielectrophoretic separation and transport based on asymmetric electrode pairs

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