Underwater Spontaneous Pumpless Transportation of Nonpolar Organic Liquids on Extreme Wettability Patterns

Huang, Shuai; Song, Jinlong; Lu, Yao; Chen, Faze; Zheng, Haomian; Yang, Xiaolong; Liu, Xin; Sun, Junbin; Carmalt, Claire J.; Parkin, Ivan P.; Xu, Wenji

doi:10.1021/acsami.5b08596

Cited by 80 publications

(61 citation statements)

References 31 publications

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“…Prior work has demonstrated water transport/management on wettability‐patterned surfaces where manipulation of liquid movement is achieved in a passive (i.e., no external power input) manner by harnessing surface‐tension forces . Other studies have shown wettability‐engineered systems can be also used for transporting organic liquid droplets on straight, peristome‐mimetic, and underwater wedge‐shaped tracks . In the present work, select regions of the superoleophobic, FS:FD:PMC coating are removed via laser ablation (thus made superoleophilic).…”

Section: Introductionmentioning

confidence: 92%

Fluorinated Nanocomposite Coatings for Confinement and Pumpless Transport of Low‐Surface‐Tension Liquids

Morrissette

Ghosh

Campos

et al. 2019

Adv Materials Inter

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pollution. Repellent surfaces hinder liquid spreading and for that purpose, are frequently used for fluid management on open surfaces. In some cases, both repellent and adhesive domains are required for efficient fluid management. [1] Wettability engineering, i.e., the spatial modification of surface energy and morphology, is a suitable option for fluid management and has been explored extensively to deliver innovative advances in materials chemistry, fabrication techniques, and a fundamental understanding of tunable liquid properties from extreme repellency to extreme wetting. In particular, superliquid-repellent surfaces have shown great promise for self-cleaning, [2] anti-fogging, [3] anti-icing, [4] drag reduction, [5] and corrosion resistance [6] applications, among others. However, the majority of prior research has focused on applications employing high-surface-tension (γ) liquids (e.g., water, γ water ≈ 72 mN m −1 ). Difficulties arise when designing surfaces that are super-repellent to low-surface-tension liquids (20-40 mN m −1 ), where wetting interactions are more sensitive to surface chemistry and surface roughness. The methodology to making a surface repellent to these liquids is essentially the same, with surface energy and surface roughness being key factors. [7] As wetting behavior is governed by competing surface forces at the contact line, [8] liquid affinity (assuming chemical and physical attributes remain constant) is mainly dependent on the probe liquid's surface tension. Ideally, high-performing superoleophobic (extreme repellency to oils and other hydrocarbons) surfaces will exhibit Cassie-Baxter [9] type wetting across a wide range of surface-tension values. However, there may be instances where Wenzel [10] type (or complete) wetting is observed with liquids of low surface tension.In order to make surfaces with specially designed reentrant structures that promote repellency to low γ liquids, [11] researchers have typically relied on costly and complex microfabrication techniques. However, scalable, large-area, sprayable superoleophobic coatings have been explored by only a few groups. [12] In addition, an ultra-omniphobic (repellent to many liquids) material (FD-POSS; (1H,1H,2H,2H-heptadec afluorodecyl) 8 Si 8 O 12 ) has been synthesized by the Air Force Research Laboratory, and is currently considered the lowest surface-energy crystalline solid material with a solid-air surface energy of 10 mN m −1 . [13] This compound is functionalized Preparing surfaces that repel low-surface-tension liquids, such as oils and hydrocarbon fuels with surface tensions below 30 mN m −1 , poses more challenges than attaining water repellency. Oleophobic surfaces are needed when organic fluids must be contained to avoid pollutant spreading. A composite material system is presented comprised of fluorinated silica (filler), a perfluoroalkyl methacrylate copolymer (binder), and fluorinated polyhedral oligomeric silsesquioxane (additive; considered the lowest surface-energy material to date), which can be ...

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Section: Introductionmentioning

confidence: 92%

Fluorinated Nanocomposite Coatings for Confinement and Pumpless Transport of Low‐Surface‐Tension Liquids

Morrissette

Ghosh

Campos

et al. 2019

Adv Materials Inter

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“…By contrast, for wedge shaped SHL-SHB pattern 1 (SSP1) with spacing distance of d1 (4 mm), nucleated droplet constantly grew and merged at SHB regions which were transported into SHL domains after contacting the border of SHL pattern. Driven by inner Laplace pressure gradient [33][34][35][36], pumpless transportation of the condensing water took place at the SHL wedge shaped track pattern (Movie S9 of Supplementary Material). As shown in Figure 8e, neighbouring droplets at the tail end of tracks merged into a large droplet due to close spacing distance of 4 mm, demonstrating fast transition to film-like condensation.…”

Section: Fabrication Of Extreme Wetting Patterns On An Al Platementioning

confidence: 99%

Superhydrophilic–superhydrophobic patterned surfaces on glass substrate for water harvesting

Zhang

Chen

et al. 2019

J Mater Sci

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Directional water harvesting is a special ability of flora and fauna in nature. Wettability-patterned surfaces inspired by natural structures have been extensively researched, and could be a great potential avenue for easing water shortage. However, preparation strategies for these nature-inspired cases, including UV irradiation with mask technology, femtosecond laser direct writing and chemical treatment are time-consuming, cost-ineffective and environmentally unfriendly. In this paper, robust and durable superhydrophobic (SHB) glass substrate was prepared by using laser-induced backward transfer (LIBT) technique and fluoroalkylsilane (FAS) modification. Then wedge-shaped superhydrophilic (SHL) patterns on the SHB surfaces were rapidly constructed by inexpensive and commercially available fiber laser ablation for fog harvesting. This facile, cost effective, and non-corrosive preparation method described herein could be an alternative way to construct SHL-SHB patterns on glass substrate, which could be used for microfluidic devices, droplet manipulation and cell screening.

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“…4 (a)]. The water droplet impacted on a wedge surface, and then moved from the narrow zone to the wide zone driven by Laplace pressure 27,28,[36][37][38] . Fig.…”

Section: Directional Transport Of Droplets On Water Harvesting Platformmentioning

confidence: 99%

Robust platform for water harvesting and directional transport

Luo

Yin

et al. 2018

J. Mater. Chem. A

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Underwater Spontaneous Pumpless Transportation of Nonpolar Organic Liquids on Extreme Wettability Patterns

Cited by 80 publications

References 31 publications

Fluorinated Nanocomposite Coatings for Confinement and Pumpless Transport of Low‐Surface‐Tension Liquids

Fluorinated Nanocomposite Coatings for Confinement and Pumpless Transport of Low‐Surface‐Tension Liquids

Superhydrophilic–superhydrophobic patterned surfaces on glass substrate for water harvesting

Robust platform for water harvesting and directional transport

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