Brushed lubricant-impregnated surfaces (BLIS) for long-lasting high condensation heat transfer

Seo, Donghyun; Shim, Jaehwan; Lee, Choongyeop; Nam, Youngsuk

doi:10.1038/s41598-020-59683-z

Cited by 31 publications

(21 citation statements)

References 49 publications

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“…Similar design of hybrid micro/nanostructured surfaces with wetting contrast can be found in the literature [64,106,107]. The slippery liquid-infused porous surface has been widely studied to promote droplet mobility [5,28,[108][109][110][111][112]. A hydrophilic directional slippery rough surface was recently fabricated to improve droplet nucleation and removal [5].…”

Section: Potential Strategies For Condensation Enhancementmentioning

confidence: 71%

Advances in Dropwise Condensation: Dancing Droplets

Wen¹,

Ma²

2020

21st Century Surface Science - A Handbook

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Vapor condensation is a ubiquitous phase change phenomenon in nature, as well as widely exploited in various industrial applications such as power generation, water treatment and harvesting, heating and cooling, environmental control, and thermal management of electronics. Condensation performance is highly dependent on the interfacial transport and its enhancement promises considerable savings in energy and resources. Recent advances in micro/nano-fabrication and surface chemistry modification techniques have not only enabled exciting interfacial phenomenon and condensation enhancement but also furthered the fundamental understanding of interfacial wetting and transport. In this chapter, we present an overview of dropwise condensation heat transfer with a focus on improving droplet behaviors through surface design and modification. We briefly summarize the basics of interfacial wetting and droplet dynamics in condensation process, discuss the underlying mechanisms of droplet manipulation for condensation enhancement, and introduce some emerging works to illustrate the power of surface modification. Finally, we conclude this chapter by providing the perspectives for future surface design in the field of condensation enhancement.

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Section: Potential Strategies For Condensation Enhancementmentioning

confidence: 71%

Advances in Dropwise Condensation: Dancing Droplets

Wen¹,

Ma²

2020

21st Century Surface Science - A Handbook

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“…Despite this practical challenge, LIS has found many potential beneficial applications. For LIS, it has been shown that liquid depletion can easily be overcome by periodically refilling the impregnated liquid ( 39 ). Inspired by this approach, we demonstrate the feasibility of refilling these surfaces to increase longevity of the hemiwicking state by leveraging the prefilled reentrant surface’s ability to wick nonwetting liquids.…”

Section: Discussion Of Limitations and Other Designsmentioning

confidence: 99%

“…Again drawing analogies to previous works designing omniphobic surfaces, which explored the effect of design parameters such as geometry and wettability on the stability of metastable wetting states ( 40 , 41 ), we expect the stability of the metastable state to be improved by increasing the reentrant angle and decreasing pitch; however, decreasing the pitch could prevent vacuum-filling given the breakthrough pressure to force nonwetting liquid into the structures would be increased ( SI Appendix , Text S7 ). On the other hand, design aspects such as making the ratio of the channel depth to the pitch too small could reduce the stability of the metastable hemiwicking state ( 39 ).…”

Section: Discussion Of Limitations and Other Designsmentioning

confidence: 99%

Turning traditionally nonwetting surfaces wetting for even ultra-high surface energy liquids

Wilke

Song

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

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We present a surface-engineering approach that turns all liquids highly wetting, including ultra-high surface tension fluids such as mercury. Previously, highly wetting behavior was only possible for intrinsically wetting liquid/material combinations through surface roughening to enable the so-called Wenzel and hemiwicking states, in which liquid fills the surface structures and causes a droplet to exhibit a low contact angle when contacting the surface. Here, we show that roughness made of reentrant structures allows for a metastable hemiwicking state even for nonwetting liquids. Our surface energy model reveals that with liquid filled in the structure, the reentrant feature creates a local energy barrier, which prevents liquid depletion from surface structures regardless of the intrinsic wettability. We experimentally demonstrated this concept with microfabricated reentrant channels. Notably, we show an apparent contact angle as low as 35° for mercury on structured silicon surfaces with fluorinated coatings, on which the intrinsic contact angle of mercury is 143°, turning a highly nonwetting liquid/material combination highly wetting through surface engineering. Our work enables highly wetting behavior for previously inaccessible material/liquid combinations and thus expands the design space for various thermofluidic applications.

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“…[29,30] Replenishing the lubricant requires the addition of complex and expensive mechanisms to the system. [31] The majority of past literature on LISs has shown temporary dropwise condensation over short periods of time (<1 day) for condensation of low surface tension liquids such as toluene, octane, ethanol, pentane, and hexane without addressing long term performance concerns. [22,32] Until now, to the best of our knowledge, the only durability test performed with a LIS was on a copper-based LIS showing sustainable condensation of ethanol and hexane for up to ≈7 h whereas longer durability test has yet to be reported.…”

Section: Introductionmentioning

confidence: 99%

Polydimethylsiloxane‐Silane Synergy enables Dropwise Condensation of Low Surface Tension Liquids

Rabbi

Yan

et al. 2022

Adv Funct Materials

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Despite decades of research on promoting the dropwise condensation of steam, achieving dropwise condensation of low surface tension liquids remains a challenge. The few coatings reported to promote dropwise condensation of low surface tension liquids either require complex fabrication methods, are substrate dependent or have poor scalability. Here, the rational development of a coating, which is applicable to all conventionally used condenser metals, is presented by combining a low contact angle hysteresis polydimethylsiloxane with a low surface energy silane using atmospheric vapor phase deposition. The siloxane-silane coating enables the dropwise condensation of fluids with surface tensions as low as 15 mN m −1 in pure vapor conditions. This siloxane-silane coating enables a 274%, 347%, and 636% heat transfer enhancement during ethanol, hexane, and pentane condensation, respectively, when compared to filmwise condensation on the same un-coated surfaces. Furthermore, this coating exhibits 15 days of steady dropwise condensation with no apparent signs of coating degradation. This study not only demonstrates the possibility of achieving stable dropwise condensation of low surface tension fluids on scalable, structure-less surfaces, it also develops design principles for creating facile, substrate-independent, durable, and scalable omniphobic coatings for a plethora of applications.

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Brushed lubricant-impregnated surfaces (BLIS) for long-lasting high condensation heat transfer

Cited by 31 publications

References 49 publications

Advances in Dropwise Condensation: Dancing Droplets

Advances in Dropwise Condensation: Dancing Droplets

Turning traditionally nonwetting surfaces wetting for even ultra-high surface energy liquids

Polydimethylsiloxane‐Silane Synergy enables Dropwise Condensation of Low Surface Tension Liquids

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