Facile fabrication of large-scale stable superhydrophobic surfaces with carbon sphere films by burning rapeseed oil

Qu, Mengnan; He, Jinmei; Cao, Biyun

doi:10.1016/j.apsusc.2010.05.011

Cited by 42 publications

(16 citation statements)

References 25 publications

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“…multistep procedures and harsh conditions, requirement of specialized reagents and equipment, durability and robustness of coating or applicability only to small areas of flat surfaces or specific materials [27]. The method we developed, suitable for our intended application, was based on the incomplete combustion of carbon nanoparticles (CNP) contained in a rapeseed oil mixture [28] or in candle soot [29] deposited on an epoxy coating layer. The method is facile and time efficient and did not require specialized equipments, dangerous reagents or complex process control.…”

Section: Decoupling Of the Sensor Response Of The Qcmmentioning

confidence: 99%

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Manipulated wettability of a superhydrophobic quartz crystal microbalance through electrowetting

Esmeryan¹,

McHale²,

Trabi³

et al. 2013

J. Phys. D: Appl. Phys.

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The liquid phase response of quartz crystal microbalances (QCM) with a thin coating (~9 µm) of epoxy resin with and without a carbon nanoparticles top layer is reported. The nanoparticles convert the epoxy surface to a superhydrophobic one with a high static contact angle (~151º-155º) and low contact angle hysteresis (~1º-3.7º) where droplets of water are in the suspended Cassie-Baxter state. The frequency decrease of the fully immersed QCM with the superhydrophobic surface is less than with only epoxy layer, thus indicating a decoupling of the QCM response. A wettability transition to a liquid penetrating into the surface roughness state (for droplets a high contact angle hysteresis Wenzel state) was triggered using a molarity of ethanol droplet test (MED) and electrowetting; the MED approach caused some surface damage. The electrowetting induced transition caused a frequency decrease of 739 Hz at a critical voltage of ~100 V compared to the QCM in air. This critical voltage correlates to a contact angle decrease of 26º and a high contact angle hysteresis state in droplet experiments. These experiments provide a proof-of-concept that QCMs can be used to sense wetting state transitions and not only mass attachments or changes in viscosity-density products of liquids. PACS:68.08Bc -wetting in liquid solid interfaces; 77.65Fs -quartz crystal resonators

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Section: Decoupling Of the Sensor Response Of The Qcmmentioning

confidence: 99%

“…First a few soot coated SH glass slides were prepared exposing them over a flame of a burning wick, immersed in a rapeseed oil [28]. Than to achieve uniform and homogenous SH surfaces the soot coated glass slides were binded with the precured epoxy coated quartz crystals [30].…”

Section: Fabrication Of Epoxy Resin-soot Composite Sh Qcmmentioning

confidence: 99%

Manipulated wettability of a superhydrophobic quartz crystal microbalance through electrowetting

Esmeryan¹,

McHale²,

Trabi³

et al. 2013

J. Phys. D: Appl. Phys.

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show abstract

“…We follow the method of Py et al 6 by examining a sequence of equilateral triangular shaped membranes with decreasing side lengths to determine the critical side length, L crit , for which an evaporating droplet can no longer completely fold up the membrane around itself; Py et al argued that the critical length should be proportional to the elastocapillary length, i.e., L crit / L EC ¼ (j B /c LV ) 1/2 . We show that suppression of capillary-induced folding or enhancement of folding a rough membrane substrate consisting of a thin PDMS film with a soot coating 16 can be achieved depending on the wetting properties of the liquid. We report the development of a carbon nanoparticle (soot) coating that is superhydrophobic for water, but is wetted by allyl alcohol and so provides a system in which both non-penetrating (Cassie-Baxter) and penetrating (Wenzel) states to be studied.…”

mentioning

confidence: 99%

“…to produce nano-and microstructured superhydrophobic surfaces on membranes but with little success. The approach that was eventually successful combined the production of rapeseed oil nanoparticles 16 with a process initially developed to transfer a layer of carbon nanoparticles from a glass surface onto a rigid PDMS surface to produce superhydrophobicity. 17 In our work, we combined these two methods using the soot covered glass transfer method with the rapeseed oil nanoparticles.…”

mentioning

confidence: 99%

Capillary origami and superhydrophobic membrane surfaces

Geraldi

Ouali

Morris

et al. 2013

Applied Physics Letters

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Capillary origami uses surface tension to fold and shape solid films and membranes into three-dimensional structures. It uses the fact that solid surfaces, no matter how hydrophobic, will tend to adhere to and wrap around the surface of a liquid. In this work, we report that a superhydrophobic coating can be created, which can completely suppress wrapping as a contacting water droplet evaporates. We also show that using a wetting azeotropic solution of allyl alcohol, which penetrates the surface features, can enhance liquid adhesion and create more powerful Capillary Origami. These findings create the possibility of selectively shaping membrane substrates.

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“…[40][41][42][43][44] While showing amazing anti-wetting properties when adhered to a substrate, surfaces created from flame generated materials typically have very low substrate adhesion and durability, with a small amount of touching, blowing, or water flow being able to carry away loosely adhered particles . Recently, candle soot was used as a template for hollow silica shells, which were then treated with a semifluorinated silane by chemical vapor deposition to create a robust superamphiphobic surface.…”

Section: Resultsmentioning

confidence: 99%

Superhydrophobic Surfaces to Resist Droplet Sprays, Simulated Rain, and Water Jets

Davis¹

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With anti-wetting properties such as contact angles greater than 150• and sliding angles less than 10• , low-cost superhydrophobic coatings hold great promise in reducing fouling and icing. However, these coatings must also resist saturation and erosion caused by water droplet impact. The first experimental study investigates the performance of a polyurethane/organoclay superhydrophobic nanocomposite modified with perfluoroalkyl methacrylic copolymer (PMC) in the presence of a high pressure air-water spray which simulates an icing cloud impact. Superhydrophobic samples were exposed at 25, 45, and 65 cm from the spray nozzle. The velocites of droplets impacting the superhydrophobic samples were estimated computationaly for each of these distances to be 14.5, 4.5, and 3.4 m /s, respectively. It was found that liquid saturation did not occur immediately, but over time, the high mass flow rate of water led to anti-wetting performance degradation. Upon evaporation through heating, contact angle returned to pre-test values, indicating little mechanical erosion. This was consistent with scanning electron microscopy (SEM) which showed that the nano-and micro-structure was preserved, as well as with energy-dispersive X-ray spectroscopy (EDXS), which showed no surface chemistry change after testing. However, sliding angle showed stronger degradation, especially at higher impact velocities.The objective of the second study was to test the mechanical durability of a polyurethane/organoclay/PMC nanocomposite coating in conditions that replicate extended rain impact. Samples were impacted with 1.4 mm droplets at a velocity of 25 m /s and a flow rate of 0.78 gpm for a period of 5 hours by an axial full cone nozzle. The cases of normal and angled 40• droplet impact were examined. After the spray period, samples were heated at 100• C to allow saturated liquid to evaporate from the surface.Contact angle and sliding angle of the superhydrophobic surfaces were measured before and after the spray period. A decrease in performance for both samples was observed, with the vertically sprayed sample showing greater degradation. After iv refunctionalizing the vertically sprayed surface with PMC, an increase in performance was observed. Microscopy of the superhydrophobic samples before and after spray impact revealed a change in surface morphology which, along with leaching of the fluoroacrylic copolymer, was the likely cause of the decrease in performance.In the third study, a novel superhydrophobic surface composed of a PTFE binder and flame-generated carbonaceous soot was created. Importantly, unlike previous surfaces created from flame-generated material, the produced surface showed good adhesive properties. Owing to the natural hydrophobicity of carbon and nanostructure of the deposited soot, surfaces displayed extreme resistance to saturation by an impinging high pressure water jet. Surfaces were found to saturate more easily as they were tilted to the impinging water jet. However, the anti-wetting properties of samples that ...

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Facile fabrication of large-scale stable superhydrophobic surfaces with carbon sphere films by burning rapeseed oil

Cited by 42 publications

References 25 publications

Manipulated wettability of a superhydrophobic quartz crystal microbalance through electrowetting

Manipulated wettability of a superhydrophobic quartz crystal microbalance through electrowetting

Capillary origami and superhydrophobic membrane surfaces

Superhydrophobic Surfaces to Resist Droplet Sprays, Simulated Rain, and Water Jets

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