Dynamics of droplet transport induced by electrowetting actuation

Bavière, Roland; Boutet, J.; Fouillet, Yves

doi:10.1007/s10404-007-0173-4

Cited by 69 publications

(59 citation statements)

References 19 publications

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“…Several microfluidic operations can be performed in the continuous microfluidic systems such as droplet splitting [22], droplet merging [23], droplet dispensing [24,25]. Transport, merging, splitting and dispensing of discrete droplets have been demonstrated successfully on the DMF platform [26][27][28].…”

Section: Chip Fabricationmentioning

confidence: 99%

Ultra-Portable Smartphone Controlled Integrated Digital Microfluidic System in a 3D-Printed Modular Assembly

et al. 2015

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Portable sensors and biomedical devices are influenced by the recent advances in microfluidics technologies, compact fabrication techniques, improved detection limits and enhanced analysis capabilities. This paper reports the development of an integrated ultraportable, low-cost, and modular digital microfluidic (DMF) system and its successful integration with a smartphone used as a high-level controller and post processing station. Low power and cost effective electronic circuits are designed to generate the high voltages required for DMF operations in both open and closed configurations (from 100 to 800 V). The smartphone in turn commands a microcontroller that manipulate the voltage signals required for droplet actuation in the DMF chip and communicates wirelessly with the microcontroller via Bluetooth module. Moreover, the smartphone acts as a detection and image analysis station with an attached microscopic lens. The holder assembly is fabricated using three-dimensional (3D) printing technology to facilitate rapid prototyping. The holder features a modular design that enables convenient attachment/detachment of a variety of DMF chips to/from an electrical busbar. The electrical circuits, controller and communication system are designed to minimize the power consumption in order to run the device on small lithium ion batteries. Successful controlled DMF operations and a basic colorimetric assay using the smartphone are demonstrated.

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Section: Chip Fabricationmentioning

confidence: 99%

Ultra-Portable Smartphone Controlled Integrated Digital Microfluidic System in a 3D-Printed Modular Assembly

et al. 2015

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“…Use of AC voltages for electrical actuation is advantageous since the possibility of chemical reactions in the droplet is minimized [29]. Additionally, Berge and Peseux [35] have reported a reduction in contact-angle hysteresis upon the use of AC voltages; this implies a reduction in the threshold voltage for actuation.…”

Section: Electrical Actuation Of Droplets On Smooth Surfaces 21 Elecmentioning

confidence: 99%

Electrical actuation-induced droplet transport on smooth and superhydrophobic surfaces

Bahadur¹,

Garimella

2010

International Journal of Micro-Nano Scale Transport

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E El le ec ct tr ri ic ca al l a ac ct tu ua at ti io on n--i in nd du uc ce ed d d dr ro op pl le et t t tr ra an ns sp po or rt t o on n s sm mo oo ot th h a an nd AbstractElectrical control of liquid droplet motion and wettability has wide-ranging applications in the field of MEMS, lab-on-a-chip devices and surface engineering, in view of the resulting enhanced flow control opportunities, low power consumption and the absence of mechanical moving parts. This article summarizes recent progress towards understanding of the fundamentals underlying electrical actuation of droplets on smooth and superhydrophobic surfaces. Electrical actuation of liquid droplets with widely differing electrical properties on smooth surfaces is first discussed. Electromechanical considerations are employed to study the actuation force on a generic liquid droplet across the entire spectrum of electrical actuation regimes. The challenges in understanding the fluid flow and dissipation mechanisms associated with a discrete moving droplet are discussed. The role of electrical voltages, interfacial energies and surface morphology in determining droplet states (nonwetting Cassie state and wetting Wenzel state) and triggering state transitions on superhydrophobic surfaces is then mapped out. Critical phenomena associated with droplet transitions on superhydrophobic surfaces (energy barrier for the Cassie-Wenzel transition, lack of spontaneous reversibility of the Cassie-Wenzel transition, robustness of the Cassie state, and the role of the roughness elements) are analyzed. The article also highlights key avenues for future research in the fields of electrical actuation-based microfluidics and superhydrophobic surfaces. INTRODUCTIONElectrical actuation of liquid droplet motion on smooth and superhydrophobic surfaces has been studied as a tool for controlling microfluidic operations which determine the performance of lab-on-a-chip devices, optical systems, fluidic displays and other MEMS-based fluidic devices. Key advantages of electrical actuation of liquids (in the form of discrete droplets) over mechanical actuation include the absence of moving mechanical parts, opportunities for enhanced and reconfigurable flow control, compatibility with liquids of widely different electrical properties, compatibility with existing fabrication techniques, and ease of integration with a chip-based microfluidic platform. Electrical actuation techniques are also very energy-efficient, typically requiring only microwatts of power per microfluidic operation. Owing to these advantages, electrical actuation-based control has attracted significantly more research interest than competing non-mechanical liquid control technologies such as thermocapillarity [1] (reduction of surface tension by temperature, leading to fluid motion), optoelectrowetting [2] (light-controlled surface tension induced pumping) and vapor bubble-based pumping [3]. Electrical actuation of liquid droplets on smooth surfaces and its potential applications have been reviewed by Mugele and Ba...

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“…Because of their reconfigurability, flexibility, and scalability, droplet-based microfluidic devices [11][12][13][14][15][16][17][18][19][68][69][70][71][72][73][74][75] promise to overcome some of the drawbacks of continuous flow systems -such as complexity, non-reconfigurability (application-specific). Several droplet actuation methods have been developed for droplet translocation, including electrostatic [13,14], thermocapillary [15,16], electrowetting [12,18,19,[28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][68][69][70]…”

Section: Chapter 1 Introductionmentioning

confidence: 99%

On-Chip Double Emulsion Droplet Assembly Using Electrowetting-on-Dielectric and Dielectrophoresis

Wang

Jones

Harding

2011

Fusion Science and Technology

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Dynamics of droplet transport induced by electrowetting actuation

Cited by 69 publications

References 19 publications

Ultra-Portable Smartphone Controlled Integrated Digital Microfluidic System in a 3D-Printed Modular Assembly

Ultra-Portable Smartphone Controlled Integrated Digital Microfluidic System in a 3D-Printed Modular Assembly

Electrical actuation-induced droplet transport on smooth and superhydrophobic surfaces

On-Chip Double Emulsion Droplet Assembly Using Electrowetting-on-Dielectric and Dielectrophoresis

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