Discrete magnetic microfluidics

Egatz-Gómez, Ana; Melle, Sonia; García, Antonio; Lindsay, Solitaire; Márquez, Manuel; Domínguez-García, P.; Rubio, Miguel A.; Picraux, S. T.; Taraci, J. L.; Clement, T.; Yang, Dezhi; Hayes, Mark A.; Gust, Devens

doi:10.1063/1.2227517

Cited by 81 publications

(61 citation statements)

References 25 publications

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“…Liquid flowing partly over the trapped air exhibits macroscopic viscous slip, that is, non-zero flow at the apparent solid-liquid boundary 15 . The slip can reduce viscous drag 16,17 and thus enhance flow in micro-and nanochannels 15 as well as in sessile droplets [19][20][21] . Combining the reduced drag with the guidance of the droplets by gravitational 18 , electric 18 or magnetic fields 19,20 opens platforms for novel functional droplet devices performing, for example, logic operations or programmable chemistry 21 .…”

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confidence: 99%

Free-decay and resonant methods for investigating the fundamental limit of superhydrophobicity

et al. 2013

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The recently demonstrated extremely water-repellent surfaces with contact angles close to 180°with nearly zero hysteresis approach the fundamental limit of non-wetting. The measurement of the small but non-zero energy dissipation of a droplet moving on such a surface is not feasible with the contemporary methods, although it would be needed for optimized technological applications related to dirt repellency, microfluidics and functional surfaces. Here we show that magnetically controlled freely decaying and resonant oscillations of water droplets doped with superparamagnetic nanoparticles allow quantification of the energy dissipation as a function of normal force. Two dissipative forces are identified at a precision of B10 nN, one related to contact angle hysteresis near the three-phase contact line and the other to viscous dissipation near the droplet-solid interface. The method is adaptable to common optical goniometers and facilitates systematic and quantitative investigations of dynamical superhydrophobicity, defects and inhomogeneities on extremely superhydrophobic surfaces.

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confidence: 99%

Free-decay and resonant methods for investigating the fundamental limit of superhydrophobicity

et al. 2013

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“…Superhydrophobicity is currently the focus of considerable research because of its scientific and technological importance [1], [2], [3], [4], [5] and [6]. Many plants and insects feature surface microstructures covered with waxy tissues which make them superhydrophobic, i.e.…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic properties of silver-coated films on copper surface by galvanic exchange reaction

Safaee¹,

Sarkar²,

Farzaneh³

2008

Applied Surface Science

112

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Hydrophobic properties of thin nanostructured silver films produced by galvanic exchange reaction on a copper surface were studied after passivation with stearic acid.The morphology of the silver films was controlled by varying the concentration of silver nitrate in the solution. Water contact angle as high as 156° and contact angle hysteresis as low as 5° were achieved for samples obtained with initial silver ion concentration of 24.75 mM in the solution. However, a strong dependence of contact angle and contact angle hysteresis on the fractal-like morphology of the silver films was observed with the variation of silver ion concentration.

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“…In magnetofluidics, droplets move on a chip surface through the use of magnetic fields. This is achieved by adding superparamagnetic particles to a droplet placed on a superhydrophobic surface with a moving magnet bar underneath [17] (Fig. 4).…”

Section: Magnetofluidicsmentioning

confidence: 99%

Open-Surface Digital Microfluidics

Yoon¹

2008

TOBIOTJ

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Open-surface digital microfluidics refers to droplet manipulations in an open surface. Different chemical/biological reaction protocols can easily be demonstrated in the same device by reprogramming the order of droplet manipulations. While continuous-flow or liquid-plug microfluidics within microchannels have inherently limited programmability, there is no limit of reprogrammability in open-surface digital microfluidics. Three different mechanisms for droplet manipulations are addressed in this mini-review: electrowetting-on-dielectric, magnetofluidics and wire-guide manipulations. Brief theories of surface tension and work of adhesion are addressed. Potential applications are addressed as well as their complications.

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Discrete magnetic microfluidics

Cited by 81 publications

References 25 publications

Free-decay and resonant methods for investigating the fundamental limit of superhydrophobicity

Free-decay and resonant methods for investigating the fundamental limit of superhydrophobicity

Superhydrophobic properties of silver-coated films on copper surface by galvanic exchange reaction

Open-Surface Digital Microfluidics

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