Application of Superhydrophobic Surface with High Adhesive Force in No Lost Transport of Superparamagnetic Microdroplet

Xia, Hong; Gao, Xuefeng; Jiang, Lei

doi:10.1021/ja065537c

Cited by 437 publications

(338 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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“…By alternating the magnetic field the superhydrophobic surface was used for the reversible, oriented transport of superparamagnetic microliter-sized liquid droplets without loss of volume between alternating magnetic fields, which is of great significance for innovative designs of open, microfluidic devices. [107] …”

Section: The Movement Of Dropletsmentioning

confidence: 99%

Bio‐Inspired, Smart, Multiscale Interfacial Materials

2008

Self Cite

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In this review a strategy for the design of bioinspired, smart, multiscale interfacial (BSMI) materials is presented and put into context with recent progress in the field of BSMI materials spanning natural to artificial to reversibly stimuli‐sensitive interfaces. BSMI materials that respond to single/dual/multiple external stimuli, e.g., light, pH, electrical fields, and so on, can switch reversibly between two entirely opposite properties. This article utilizes hydrophobicity and hydrophilicity as an example to demonstrate the feasibility of the design strategy, which may also be extended to other properties, for example, conductor/insulator, p‐type/n‐type semiconductor, or ferromagnetism/anti‐ferromagnetism, for the design of other BSMI materials in the future.

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“…superhydrophobic surfaces where the contact angle is larger than 150 • ) are mostly used in self-cleaning surfaces [2], tunable lenses [3], micro-fluidic systems [4] and non-adhesive coating [5,6]. Since the last two decades, the wetting phenomena on superhydrophobic surface has become a subject of fundamental research in physics [7][8][9], chemistry [10], biology [11,12] and materials science [13,14]. In material science, many metallic superhydrophobic surfaces are mostly used as anticorrosive surfaces.…”

Section: Introductionmentioning

confidence: 99%

Water condensation on zinc surfaces treated by chemical bath deposition

Narhe

González-Viñas

Beysens

2010

Applied Surface Science

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a b s t r a c tWater condensation, a complex and challenging process, is investigated on a metallic (Zn) surface, regularly used as anticorrosive surface. The Zn surface is coated with hydroxide zinc carbonate by chemical bath deposition, a very simple, low-cost and easily applicable process. As the deposition time increases, the surface roughness augments and the contact angle with water can be varied from 75 • to 150 • , corresponding to changing the surface properties from hydrophobic to ultrahydrophobic and superhydrophobic. During the condensation process, the droplet growth laws and surface coverage are found similar to what is found on smooth surfaces, with a transition from Cassie-Baxter to Wenzel wetting states at long times. In particular, it is noticeable in view of corrosion effects that the water surface coverage remains on order of 55%.

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Application of Superhydrophobic Surface with High Adhesive Force in No Lost Transport of Superparamagnetic Microdroplet

Cited by 437 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

Bio‐Inspired, Smart, Multiscale Interfacial Materials

Water condensation on zinc surfaces treated by chemical bath deposition

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