Oil droplet self-transportation on oleophobic surfaces

Li, Juan; Qin, Qi; Shah, Ali; Ras, Robin H. A.; Tian, Xuelin; Jokinen, Ville

doi:10.1126/sciadv.1600148

Cited by 119 publications

(103 citation statements)

References 34 publications

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“…Among these strategies, the creation of wettability gradient by structural topography or chemical heterogeneity has gained increasing attention owing to its advantages such as the alleviation of external energy supply and easy operation 13, 28, 34–41 . In the aspect of chemical heterogeneity, the spontaneous droplet motion resulting from the flat surface with a wettability gradient is first experimentally demonstrated by Chaudhury and Whitesides 1 .…”

Section: Introductionmentioning

confidence: 99%

Long-range spontaneous droplet self-propulsion on wettability gradient surfaces

Liu

Sun

et al. 2017

Sci Rep

130

125

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The directional and long-range droplet transportation is of great importance in microfluidic systems. However, it usually requires external energy input. Here we designed a wettability gradient surface that can drive droplet motion by structural topography. The surface has a wettability gradient range of over 150° from superhydrophobic to hydrophilic, which was achieved by etching silicon nanopillars and adjusting the area of hydrophilic silicon dioxide plane. We conducted force analysis to further reveal the mechanism for droplet self-propulsion, and found that the nanostructures are critical to providing a large driving force and small resistance force. Theoretical calculation has been used to analyze the maximal self-propulsion displacement on different gradient surfaces with different volumes of droplets. On this basis, we designed several surfaces with arbitrary paths, which achieved directional and long-range transportation of droplet. These results clarify a driving mechanism for droplet self-propulsion on wettability gradient surfaces, and open up new opportunities for long-range and directional droplet transportation in microfluidic system.

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Section: Introductionmentioning

confidence: 99%

Long-range spontaneous droplet self-propulsion on wettability gradient surfaces

Liu

Sun

et al. 2017

Sci Rep

130

125

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“…Beginning with the first record of capillary rise by Leonardo da Vinci in the Renaissance period (13), continuous interest has persisted for several centuries (14)(15)(16). Although much work has been performed in the last five centuries, issues as fundamental as the effects of substrate texture and surface superwettability are only recently being understood (17)(18)(19)(20). In addition to water elevation, spontaneous water transfer from one container to another is of great importance.…”

mentioning

confidence: 99%

Bioinspired inner microstructured tube controlled capillary rise

Dai

Gao

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

117

102

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Effective, long-range, and self-propelled water elevation and transport are important in industrial, medical, and agricultural applications. Although research has grown rapidly, existing methods for water film elevation are still limited. Scaling up for practical applications in an energy-efficient way remains a challenge. Inspired by the continuous water cross-boundary transport on the peristome surface of Nepenthes alata, here we demonstrate the use of peristome-mimetic structures for controlled water elevation by bending biomimetic plates into tubes. The fabricated structures have unique advantages beyond those of natural pitcher plants: bulk water diode transport behavior is achieved with a high-speed passing state (several centimeters per second on a milliliter scale) and a gating state as a result of the synergistic effect between peristomemimetic structures and tube curvature without external energy input. Significantly, on further bending the peristome-mimetic tube into a "candy cane"-shaped pipe, a self-siphon with liquid diode behavior is achieved. Such a transport mechanism should inspire the design of next generation water transport devices. biomimetic | capillary rise | diode | siphon | water transport

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“…As a result, droplets stay in a thermodynamically quasi‐stable state with elongated lifetime and enhanced mobility, providing extensive potentials in fluidic devices, energy conversion, and drag reduction . Distinct from ambient or condensation condition where the droplets are usually manipulated by wetting gradient and topographical asymmetry, droplets at Leidenfrost state exhibit a self‐activation and self‐rotation without the need of any asymmetric features …”

Section: Introductionmentioning

confidence: 99%

Rectification of Mobile Leidenfrost Droplets by Planar Ratchets

Zhou

Zhang

et al. 2019

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The self‐transportation of mobile Leidenfrost droplets with well‐defined direction and velocity on millimetric ratchets is one of the most representative and spectacular phenomena in droplet dynamics. Despite extensive progress in the ability to control the spatiotemporal propagation of droplets, it remains elusive how the individual ratchet units, as well as the interactions within their arrays, are translated into the collective droplet dynamics. Here, simple planar ratchets characterized by uniform height normal to the surface are designed. It is revealed that on planar ratchets, the transport dynamics of Leidenfrost droplets is dependent not only on individual units, but also on the elegant coordination within their arrays dictated by their topography. The design of planar ratchets enriches the fundamental understanding of how the surface topography is translated into dynamic and collective droplet transport behaviors, and also imparts higher applicability in microelectromechanical system based fluidic devices.

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Oil droplet self-transportation on oleophobic surfaces

Abstract: Oleophobic surfaces capable of power-free self-transportation of oil droplets are designed.

Cited by 119 publications

References 34 publications

Long-range spontaneous droplet self-propulsion on wettability gradient surfaces

Long-range spontaneous droplet self-propulsion on wettability gradient surfaces

Bioinspired inner microstructured tube controlled capillary rise

Rectification of Mobile Leidenfrost Droplets by Planar Ratchets

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