Stable Dropwise Condensation for Enhancing Heat Transfer via the Initiated Chemical Vapor Deposition (iCVD) of Grafted Polymer Films

Paxson, Adam; Yagüe, José Luis Fuentes; Gleason, Karen K.; Varanasi, Kripa K.

doi:10.1002/adma.201303065

Cited by 240 publications

(220 citation statements)

References 35 publications

(22 reference statements)

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“…It is worth noticing that the here-shown influence of the Young angle (in its whole range) on the condensation phenomenon of flat and textured surfaces (Figures 2 and 5), though investigated in this work for antifog purposes, could be useful also for applications requiring dropwise condensation rather than a liquid-wise one. 24,25 It is also interesting to note that the dropwise condensation observed on superhydrophobic surfaces has been recently reported by other authors to show an antifog functionality at low temperature, beside the anti-icing one, since condensed droplets can be easily removed from the surface by tilting or slightly blowing. 26 Another aspect relevant to antifogging of transparent surfaces is the time necessary for dewetting, that is, the time necessary to achieve a full evaporation of condensed water, thus completely restoring the initial condition.…”

Section: Methodsmentioning

confidence: 88%

Long-Lasting Antifog Plasma Modification of Transparent Plastics

Mundo

d’Agostino

Palumbo

2014

ACS Appl. Mater. Interfaces

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Antifog surfaces are necessary for any application requiring optical efficiency of transparent materials. Surface modification methods aimed toward increasing solid surface energy, even when supposed to be permanent, in fact result in a nondurable effect due to the instability in air of highly hydrophilic surfaces. We propose the strategy of combining a hydrophilic chemistry with a nanotextured topography, to tailor a long-lasting antifog modification on commercial transparent plastics. In particular, we investigated a two-step process consisting of self-masked plasma etching followed by plasma deposition of a silicon-based film. We show that the deposition of the silicon-based coatings on the flat (pristine) substrates allows a continuous variation of wettability from hydrophobic to superhydrophilic, due to a continuous reduction of carbon-containing groups, as assessed by Fourier transform infrared and X-ray photoelectron spectroscopies. By depositing these different coatings on previously nanotextured substrates, the surface wettability behavior is changed consistently, as well as the condensation phenomenon in terms of microdroplets/liquid film appearance. This variation is correlated with advancing and receding water contact angle features of the surfaces. More importantly, in the case of the superhydrophilic coating, though its surface energy decreases with time, when a nanotextured surface underlies it, the wetting behavior is maintained durably superhydrophilic, thus durably antifog.

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Section: Methodsmentioning

confidence: 88%

Long-Lasting Antifog Plasma Modification of Transparent Plastics

Mundo

d’Agostino

Palumbo

2014

ACS Appl. Mater. Interfaces

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“…55 Chen et al 17 40 Kulinich et al 28 27 Dou et al 18 Over the past several years, superhydrophobic surfaces were regarded as a prospective strategy for reducing ice adhesion. A model to justify this implementation was presented by Kulinich et al, 28 according to which water in the Cassie−Baxter state freezes and the entrapped air below the water reduces the contact area between the finally formed ice and the solid.…”

Section: Surface Engineering Considerationsmentioning

confidence: 99%

Physics of Icing and Rational Design of Surfaces with Extraordinary Icephobicity

Schutzius,

Jung,

Maitra

et al. 2014

Langmuir

322

268

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Icing of surfaces is commonplace in nature and technology, affecting everyday life and sometimes causing catastrophic events. Understanding (and counteracting) surface icing brings with it significant scientific challenges that requires interdisciplinary knowledge from diverse scientific fields such as nucleation thermodynamics and heat transfer, fluid dynamics, surface chemistry, and surface nanoengineering. Here we discuss key aspects and findings related to the physics of ice formation on surfaces and show how such knowledge could be employed to rationally develop surfaces with extreme resistance to icing (extraordinary icephobicity). Although superhydrophobic surfaces with micro-, nano-, or (often biomimetic) hierarchical roughnesses have shown in laboratory settings (under certain conditions) excellent repellency and low adhesion to water down to temperatures near or below the freezing point, extreme icephobicity necessitates additional important functionalities. Other approaches, such as lubricant-impregnated surfaces, exhibit both advantages and serious limitations with respect to icing. In all, a clear path toward passive surfaces with extreme resistance to ice formation remains a challenge, but it is one well worth undertaking. Equally important to potential applications is scalable surface manufacturing and the ability of icephobic surfaces to perform reliably and sustainably outside the laboratory under adverse conditions. Surfaces should possess mechanical and chemical stability, and they should be thermally resilient. Such issues and related research directions are also addressed in this article.

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“…A remarkable case is dropwise condensation, i.e., water vapor condenses into droplets on substrates [6][7][8][9][10][11]. It has long been an engineering concern due to higher heat transfer coefficients in dropwise condensation than that in filmwise condensation [12].…”

Section: Introductionmentioning

confidence: 99%