Mapping Depletion of Lubricant Films on Antibiofouling Wrinkled Slippery Surfaces

Peppou-Chapman, Sam; Neto, Chiara

doi:10.1021/acsami.8b11768

Cited by 76 publications

(107 citation statements)

References 40 publications

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“…All the process was visualized and recorded under an optical microscope, thanks to the thin‐film interference coupling. Thus, our platform offers a convenient tool for studies of oil–water–nanopores interplay under ambient conditions whereas other techniques are arduous . We show that water condensation–evaporation on an oil‐hosting nanomaterial leads to oil displacement in the nanopore network and even drives oil to form detached droplets onto the surface; in this way, simple and effective extraction of the oil from the nanopores is achieved.…”

Section: Introductionmentioning

confidence: 94%

Oil Recovery from Nanoporous Media via Water Condensation

Gimenez

Bellino

2019

Adv Materials Inter

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Oil–nanoporous materials interplay is ubiquitous in oil recovery from unconventional reservoirs, environmental clean‐up, and membrane technology, so there is a genuine need for novel approaches that can monitor, manipulate, and also extract the oil present in nanoporous media. Here demonstrated is a water condensation–assisted method of extracting oil from nanopores. Under cooling‐induced condensation at room conditions, distinctive droplet modes act as both decoupling and collecting elements to transport oil from the pore space toward the nanomaterial surface after water evaporation. Even the movement of the oil through the nanoporous network can be visualized by taking advantage of the interference response of visible light in a nanoporous thin‐film platform. The method and results presented in this work open different routes to exploit oil–water–nanopore interactions and enable novel perspectives for oil recovery and environmental clean‐up.

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Section: Introductionmentioning

confidence: 94%

Oil Recovery from Nanoporous Media via Water Condensation

Gimenez

Bellino

2019

Adv Materials Inter

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“…These findings indicate that nano-or microstructures are indeed essential in retaining oil and thus guaranteeing the occurrence of transient oil re-distribution. 42,43 Similarly, we expect there to be a minimum critical oil thickness, under which droplets no longer selfpropagate, given that there is no self-propulsion without an oil layer. We conducted condensation experiment on a vertically mounted Glaco-coated glass slide sample impregnated with GPL 106 oil at 1500 rpm and monitored the droplet dynamics using a high-speed camera.…”

Section: Movement Of Microdroplets Induced By Asymmetrical Oil Meniscimentioning

confidence: 99%

Microdroplet self-propulsion during dropwise condensation on lubricant-infused surfaces

Sun

Weisensee

2019

Soft Matter

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Water vapor condensation is common in nature and widely used in industrial applications, including water harvesting, power generation, and desalination. As compared to traditional filmwise condensation, dropwise condensation on lubricant-infused surfaces (LIS) can lead to an order-of-magnitude increase in heat transfer rates. Small droplets (D ≤ 100 μm) account for nearly 85 % of the total heat transfer and droplet sweeping plays a crucial role in clearing nucleation sites, allowing for frequent re-nucleation. Here, we focus on the dynamic interplay of microdroplets with the thin lubricant film during water vapor condensation on LIS. Coupling high-speed imaging, optical microscopy, and interferometry, we show that the initially uniform lubricant film re-distributes during condensation. Governed by lubricant height gradients, microdroplets as small as 2 μm in diameter undergo rigorous and gravity-independent selfpropulsion, travelling distances multiples of their diameters at velocities up to 1100 µm/s. Although macroscopically the movement appears to be random, we show that on a microscopic level capillary attraction due to asymmetrical lubricant menisci causes this gravity-independent droplet motion. Based on a lateral force balance analysis, we quantitatively find that the sliding velocity initially increases during movement, but decreases sharply at shorter inter-droplet spacing. The maximum sliding velocity is inversely proportional to the oil viscosity and is strongly dependent of the droplet size, which is in excellent agreement with the experimental observations. This novel and non-traditional droplet movement is expected to significantly enhance the sweeping efficiency during dropwise condensation, leading to higher nucleation and heat transfer rates.

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“…The draining lasted until a silicone oil meniscus could not be seen around water droplets placed on the infused surfaces (Figure S4, Supporting Information), as this indicates a small but sustainable volume of oil is present on the surface. [ 7 ]…”

Section: Resultsmentioning

confidence: 99%

Antifouling Properties of Liquid‐Infused Riblets Fabricated by Direct Contactless Microfabrication

Fenati

Quinn²,

Bilinsky³

et al. 2020

Adv Eng Mater

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The fabrication of riblets and surfaces structured with aligned grooves, by direct contactless microfabrication (DCM), and the ability of the riblets to function as lubricant‐infused surfaces, is reported. Three types of riblets are fabricated with features (width, height, and period) on the micrometric scale, and with two different UV‐crosslinkable coatings. Riblets with width 10 μm, period 40 μm, and height 30 μm show high water repellence as prepared (water contact angle [WCA] 147°) and, once infused with silicone oil 10 cSt, result in water droplets rolling off the surface at tilt angles of 10°. These riblets are effective at reducing the attachment of marine bacteria, both in the as‐prepared and infused form. The DCM process produces structured surfaces over large areas (10 × 10 cm2) in a few minutes and using inexpensive materials, making mechanically robust surfaces. The DCM process is scalable to the large surface areas required for marine and other applications. The low roll‐off angles and the bacterial inhibition results achieved on the riblets indicate that riblets are an up‐scalable and nontoxic alternative to more complicated fabricated techniques, with potential as antifouling and drag‐reducing coatings.

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Mapping Depletion of Lubricant Films on Antibiofouling Wrinkled Slippery Surfaces

Cited by 76 publications

References 40 publications

Oil Recovery from Nanoporous Media via Water Condensation

Oil Recovery from Nanoporous Media via Water Condensation

Microdroplet self-propulsion during dropwise condensation on lubricant-infused surfaces

Antifouling Properties of Liquid‐Infused Riblets Fabricated by Direct Contactless Microfabrication

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