Modification of lubricant infused porous surface for low-voltage reversible electrowetting

He, Xiaodong; Qiang, Wenbin; Du, Chao; Shao, Qunfeng; Zhang, Xiaoping; Deng, Yuanfu

doi:10.1039/c7ta05890j

Cited by 42 publications

(26 citation statements)

References 35 publications

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“…The is because additional wetting ridges around droplets can anchor contact lines and thus enhance dissipation of viscous oscillation energy. Subsequent research achieved low actuating voltages 91 (decrease from 500 V to 5 V) and digital microfluidics with fast droplet transport (85 mm s À1 ) and stable repeatability (45000 times), 92 showing great performance improvement compared with typical EWOD devices.…”

Section: Fluid Systems In Ewodmentioning

confidence: 99%

Recent progress of electrowetting for droplet manipulation: from wetting to superwetting systems

Teng

Tian

et al. 2020

Mater. Chem. Front.

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Section: Fluid Systems In Ewodmentioning

confidence: 99%

Recent progress of electrowetting for droplet manipulation: from wetting to superwetting systems

Teng

Tian

et al. 2020

Mater. Chem. Front.

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“…Supporting Information is available from the Wiley Online Library or from the author. [66] 0.998 Glycerol 64 [66] 1.261 Diiodomethane (DIM) 50.8 [66] 3.325 DMSO 43.54 [66] 1.1004 Dimethylformamide (DMF) 37.10 [66] 0.948 Cyclohexanol 34.4 (at 25°C) [66] 0.9624 Mineral oil lightbioreagent 32 [67] 0.8 Toluene 28.40 [66] 0.87 n-Hexadecane 27.5 [66] 0.77 Dichloromethane 26.5 1.3266 Ethanol 22.10 [66] 0.810 Silicone oil 10 cSt 20.1 (at 25°C) [68] 0.95 Krytox GPL 103 (PFPE) 20 [69] 1.88 n-Hexane 18.43 [66] 0.6606 FC40 16 [70] 1.855 θadv = advancing contact angle of the intruding liquid on a corresponding liquid-infused surface; θrec = receding contact angle of the intruding liquid on a corresponding liquid-infused surface; Hydroxylated: OH; Perfluorynated: PFDT; Alkylated: CH3; Standard deviations can be found in supplementary information.…”

Section: Supporting Informationmentioning

confidence: 99%

Formation of Liquid–Liquid Micropatterns through Guided Liquid Displacement on Liquid‐Infused Surfaces

Paulssen

Feng

Pini

et al. 2018

Adv Materials Inter

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Here we demonstrate a method to pattern liquids of varying surface tension and composition into droplets by utilizing slippery liquid-infused surfaces prepared on chemically-patterned substrates. We study the capability of different liquids to displace the lubricant from higher surface energy regions and show that both high and low surface tension liquids can imbibe the polymer, thereby forming droplets sharply following underlying surface energy patterns. For all liquids tested, droplet arrays of arbitrary shapes of each liquid were formed with precision down to 50 µm. By changing the chemical patterning from fluorinated to aliphatic groups, patterns of mineral and silicone oils were created. Finally, we demonstrate formation of two-dimensional micropatterns of three-phase liquid systemsfluorinated, organic, and aqueous phases. Liquid patterning on solid surfaces is an essential process in micro-and nano-fabrication. It has been used for microelectromechanical systems (MEMS)-fabrication, [1],[2],[3] microfluidicdevice design [4],[5] bio-scaffold creation, [6] or high-throughput screening efforts.

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“…To infuse lubricant, krytox fluorinated oil (surface tension below 20 mN/m) was spin-coated on the film at a speed of 1500 r/min (Figure c). After infusing the lubricant, the substrate turned transparent, , with a transmittance of ∼40 to 80%. In contrast, the un-infused substrate was white and nontransparent (Figure h).…”

Section: Resultsmentioning

confidence: 99%

Field-Induced Wettability Gradients for No-Loss Transport of Oil Droplets on Slippery Surfaces

Tang

Meng

Zhuang

et al. 2020

ACS Appl. Mater. Interfaces

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Transporting oil droplets is crucial for a wide range of industrial and biomedical applications but remains highly challenging due to the large contact angle hysteresis on most solid surfaces. A liquid-infused slippery surface has a low hysteresis contact angle and is a highly promising platform if sufficient wettability gradient can be created. Current strategies used to create wettability gradient typically rely on the engineering of the chemical composition or geometrical structure. However, these strategies are inefficient on a slippery surface because the infused liquid tends to conceal the gradient in the chemical composition and small-scale geometrical structure. Magnifying the structure, on the other hand, will significantly distort the surface topography, which is unwanted in practice.In this study, we address this challenge by introducing a field-induced wettability gradient on a flat slippery surface. By printing radial electrodes array, we can pattern the electric field, which induces gradient contact angles. Theoretical analysis and experimental results reveal that the droplet transport behavior can be captured by a nondimensional electric Bond number. Our surface enables no-loss transport of various types of droplets, which we expect to find important applications such as heat transfer, anticontamination, microfluidics, and biochemical analysis.

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Modification of lubricant infused porous surface for low-voltage reversible electrowetting

Abstract: Low voltage electrowetting can be achieved by modifying silicone oil impregnated PTFE membrane with PFOTS.

Cited by 42 publications

References 35 publications

Recent progress of electrowetting for droplet manipulation: from wetting to superwetting systems

Recent progress of electrowetting for droplet manipulation: from wetting to superwetting systems

Formation of Liquid–Liquid Micropatterns through Guided Liquid Displacement on Liquid‐Infused Surfaces

Field-Induced Wettability Gradients for No-Loss Transport of Oil Droplets on Slippery Surfaces

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