Phase-Change Slippery Liquid-Infused Porous Surfaces with Thermo-Responsive Wetting and Shedding States

Gulfam, Raza; Orejon, Daniel; Choi, Changhwan; Zhang, Peng

doi:10.1021/acsami.0c06441

Cited by 47 publications

(26 citation statements)

References 63 publications

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“…We attribute the high heat transfer rates in IOC to preferential condensate transport in the axial direction featuring high hydraulic conductivity cracks. When the porous inverse opal coating was functionalized and impregnated with a lubrication film, the phase-change heat transfer coefficient increased by an additional 30% to 103 ± 13 kW/m 2 K. This enhancement in heat transfer rate agrees with prior studies 64 . We attribute the improvements in heat transfer rate in SLIPS to smaller departure radius and higher departure frequency of falling droplets when compared to DWC.…”

Section: Resultssupporting

confidence: 88%

Enhanced condensation heat transfer using porous silica inverse opal coatings on copper tubes

Adera

Naworski

Davitt

et al. 2021

Sci Rep

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Phase-change condensation is commonplace in nature and industry. Since the 1930s, it is well understood that vapor condenses in filmwise mode on clean metallic surfaces whereas it condenses by forming discrete droplets on surfaces coated with a promoter material. In both filmwise and dropwise modes, the condensate is removed when gravity overcomes pinning forces. In this work, we show rapid condensate transport through cracks that formed due to material shrinkage when a copper tube is coated with silica inverse opal structures. Importantly, the high hydraulic conductivity of the cracks promote axial condensate transport that is beneficial for condensation heat transfer. In our experiments, the cracks improved the heat transfer coefficient from ≈ 12 kW/m2 K for laminar filmwise condensation on smooth clean copper tubes to ≈ 80 kW/m2 K for inverse opal coated copper tubes; nearly a sevenfold increase from filmwise condensation and identical enhancement with state-of-the-art dropwise condensation. Furthermore, our results show that impregnating the porous structure with oil further improves the heat transfer coefficient by an additional 30% to ≈ 103 kW/m2 K. Importantly, compared to the fast-degrading dropwise condensation, the inverse opal coated copper tubes maintained high heat transfer rates when the experiments were repeated > 20 times; each experiment lasting 3–4 h. In addition to the new coating approach, the insights gained from this work present a strategy to minimize oil depletion during condensation from lubricated surfaces.

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Section: Resultssupporting

confidence: 88%

Enhanced condensation heat transfer using porous silica inverse opal coatings on copper tubes

Adera

Naworski

Davitt

et al. 2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…[ 57 ] When the porous matrix is incorporated with an infused phase change material ( e.g ., paraffin), thermal‐responsive wetting is achieved due to its tunable surface roughness arisen from the phase change process. [ 96 ] In the solid phase of paraffin at room temperature, the surface of the composite appears with random micro bumps and dents, rendering the pinning of droplets. Upon heating to the liquid phase of paraffin at 60°C, the composite is comprised of a smooth liquid surface, causing high droplet mobility (Figure 8b).…”

Section: Propertiesmentioning

confidence: 99%

Section: Propertiesmentioning

confidence: 99%

“…Upon heating to the liquid phase of paraffin at 60°C, the composite is comprised of a smooth liquid surface, causing high droplet mobility (Figure 8b). [96] Generally, for thermal storage applications, phase change materials with the large latent heat of fusion during melting and solidifying are selected, since they can store or release isothermal energy during their phase transitions. [55,97,98] Taking the advantage of phase change materials, the graphene aerogel microsphere/paraffin (GAM/paraffin) composite has been developed with tunable thermal storage/release properties.…”

Section: Thermal Propertiesmentioning

confidence: 99%

mentioning

confidence: 99%

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Solid–Liquid Host–Guest Composites: The Marriage of Porous Solids and Functional Liquids

Sheng

Ding

et al. 2021

Advanced Materials

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Composite materials can provide remarkable improvements over the individual constituents. Especially, with a liquid component introduced into a solid porous host, solid–liquid host–guest composites have recently come to the forefront with exceptional functions that promise them for a wealth of applications. Combining the unprecedented dynamic, transparent, omniphobic, self‐healing, diffusive and adaptive nature of functional liquid with inherent solid host's property, solid–liquid host–guest composites can realize the ease of fabrication, long‐term stability, and a broad spectrum of enhanced properties, which cannot be fully met by conventional solid–solid composites or liquid–liquid composites. This review presents the state‐of‐the‐art progress in solid–liquid host–guest composites. Initially, the concept, classification, design strategy, as well as fabrication methods as a path forward to develop the composites are unraveled, and further it is elaborated on how the functionality of porous solid and functional liquid can be harnessed to create composites with a broad range of unique properties, especially, the optical, thermal, electric, mechanical, sorption, and separation properties. With these fascinating properties, a myriad of emerging applications such as optical devices, thermal management, electromagnetic‐interference shielding, soft electronics, gas capture and release, and multiphase separations are touched upon, inspiring more frontier researches in materials science, interfacial chemistry, membrane science, engineering, and multidisciplinary. Finally, this review provides the perspective on the future directions of solid–liquid host–guest composites and assesses the challenges and opportunities ahead.

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How to Select Phase Change Materials for Tuning Condensation and Frosting?

Chatterjee

Chaudhari

Anand

2022

Adv Funct Materials

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Synthetic surfaces engineered to regulate phase transitions of matter and exercise control over its undesired accrual (liquid or solid) play a pivotal role in diverse industrial applications. Over the years, the design of repellant surfaces has transitioned from solely modifying the surface texture and chemistry to identifying novel material systems. In this study, selection criteria are established to identify bio-friendly phase change materials (PCMs) from an extensive library of vegetable-based/organic/essential oils that can thermally respond by harnessing the latent heat released during condensation and thereby delaying ice/frost formation in the very frigid ambient that is detrimental to its functionality. Concurrently, a comprehensive investigation is conducted to elucidate the relation between microscale heat transport phenomena during condensation and the resulting macroscopic effects (e.g., delayed droplet freezing) on various solidified PCMs as a function of their inherent thermo-mechanical properties. In addition, to freeze protection, many properties that are responsive to the thermal reflex of the surface, such as the ability to dynamically tune optical transparency, moisture harvesting, ice shedding, and quick in-field repairability, are achievable, resulting in the development of protective coatings capable of spanning a wide range of functionalities and thereby having a distinctive edge over conventional solutions.

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Phase-Change Slippery Liquid-Infused Porous Surfaces with Thermo-Responsive Wetting and Shedding States

Cited by 47 publications

References 63 publications

Enhanced condensation heat transfer using porous silica inverse opal coatings on copper tubes

Enhanced condensation heat transfer using porous silica inverse opal coatings on copper tubes

Solid–Liquid Host–Guest Composites: The Marriage of Porous Solids and Functional Liquids

How to Select Phase Change Materials for Tuning Condensation and Frosting?

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