Can Metal Matrix‐Hydrophobic Nanoparticle Composites Enhance Water Condensation by Promoting the Dropwise Mode?

Damle, Viraj; Sun, Xiaoda; Rykaczewski, Konrad

doi:10.1002/admi.201500202

Cited by 15 publications

(10 citation statements)

References 85 publications

(35 reference statements)

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“…[34][35][36] However, for vapor condensation on a surface, a hydrophobic surface is preferred (Figure 1D) for the formation of discrete droplets. 25,[37][38][39][40][41][42] Micro/nanostructures are thus fabricated on hydrophobic surfaces to further increase the apparent contact angle. Decreasing the solid-liquid contact area through micro-structuring results in the formation of suspended droplets in the Cassie state according to cos q = (1 À 4 s ) cos q Y À 1, where 4 s is the solid-liquid fraction (Figure 1H).…”

Section: Context and Scalementioning

confidence: 99%

Liquid-Vapor Phase-Change Heat Transfer on Functionalized Nanowired Surfaces and Beyond

Wen

Lee

et al. 2018

Joule

182

101

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Liquid-vapor phase-change processes have been widely exploited in industrial applications including power generation, water processing and harvesting, cooling/refrigeration and environmental control, and thermal management. Enhancing liquid-vapor phase-change heat transfer is of practical interest. Recent advances in micro/nano-fabrication and characterization techniques have not only enabled exciting heat transfer enhancements but also furthered the fundamental understanding of the liquid-vapor phase-change processes. Nanowires can be synthesized with precise control for producing diverse and desired surface morphology with tunable wettability. This review presents an overview of liquid-vapor phase-change heat transfer enhancement on functionalized nanowired surfaces, as well as other promising strategies and surfaces. In this review, we briefly summarize the fabrication techniques for functionalized nanowired surfaces, discuss the underlying mechanisms for boiling and condensation enhancement, and introduce some important works to illustrate the power of design for functionality. We conclude this review by providing the perspectives for future research directions.

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Section: Context and Scalementioning

confidence: 99%

Liquid-Vapor Phase-Change Heat Transfer on Functionalized Nanowired Surfaces and Beyond

Wen

Lee

et al. 2018

Joule

182

101

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“…In these systems, the enhancement in the condensation heat and mass transfer could significantly improve system performance, reduce energy costs, and impact economic development. Condensation is dramatically influenced by the physical structure and chemical properties of the solid surface . Depending on the surface wettability, water vapor that condenses on the solid surface exists either in the form of thin films (filmwise) or individual drops (dropwise).…”

Section: Bioinspired Interfacial Surfaces With Enhanced Drop Mobilitymentioning

confidence: 99%

“…Recently, Rykaczewski et al reported dropwise condensation on a flat copper surface embedded with hydrophobic nanoparticles patches. Owing to the flat nature of the surface, this design might avoid the liquid flooding problem encountered in the conventional SHS …”

Section: Bioinspired Interfacial Surfaces With Enhanced Drop Mobilitymentioning

confidence: 99%

“…Condensation is dramatically influenced by the physical structure and chemical properties of the solid surface. [106,[205][206][207][208][209][210][211][212] Depending on the surface wettability, water vapor condenses on the solid surface exists either in the form of thin films (filmwise) or individual drops (dropwise). In filmwise condensation, the liquid film formed between the solid surface and the vapor brings an additional resistance, limiting the amount of heat transfer that can take place across the solid surface.…”

Section: Condensation Applicationmentioning

confidence: 99%

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Bioinspired Interfacial Materials with Enhanced Drop Mobility: From Fundamentals to Multifunctional Applications

Hao

Liu

Chen

et al. 2016

Small

202

125

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The development of bioinspired interfacial materials with enhanced drop mobility that mimic the innate functionalities of nature will have a significant impact on the energy, environment and global healthcare. Despite extensive progress, state of the art interfacial materials have not reached the level of maturity sufficient for industrial applications in terms of scalability, stability, and reliability. These are complicated by their operating environments and lack of facile approaches to control the local structural texture and chemical composition at multiple length scales. The recent advances in the fundamental understanding are reviewed, as well as practical applications of bioinspired interfacial materials, with an emphasis on the drop bouncing and coalescence-induced jumping behaviors. Perspectives on how to catalyze new discoveries and to foster technological adoption to move this exciting area forward are also suggested.

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“…In principle, any sub-microscale structures with a small feature size (tip size and interspace) and a certain height (or depth) can become effective candidates for creating CMDSP surfaces. In fact, except for arrays of closely packed nanotips, including nanocones, [22,27,50,69,70] nanoneedles, [21,28,31,66,71] nanopencils, [23] and tip-like nanotubes, [72,73] other architectures such as nano wires, [24,74] nanosheet arrays, [20,29,62,75] nanorod-capped nano pores, [68,76] the porous structure of nanoparticles, [67] nanoparticle aggregates, [73,[77][78][79][80] and two-tier structures [25,57,63,[81][82][83][84][85][86][87][88][89] have all been verified to be effective in endowing material surfaces with the desired CMDSP functionality as long as they follow these basic construction rules.…”

Section: Construction Rules Of Bionic Cmdsp Surfacesmentioning

confidence: 99%

Recent Progress in Bionic Condensate Microdrop Self‐Propelling Surfaces

2017

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interest has focused on utilizing the lowadhesivity nature of superhydrophobic surfaces for the rapid removal of condensate microdrops, as this has significance in fundamental research and technological innovation. Example applications are the enhancement of condensation heat transfer for high-efficiency thermal management and energy utilization, [20][21][22][23][24][25] energy-effective antifreezing for airconditioner heat exchangers and aircraft wings, [26][27][28] and electrostatic energy harvesting. [29] In general, condensate drops on typical flat hydrophobic surfaces are only shed off under gravity when their sizes are comparable to the capillary length (≈2.7 mm for water), [30] which creates undesirable effects such as large thermal resistance [20][21][22][23][24][25] and the freezing of subcooled drops. [26][27][28] Clearly, a great challenge is the timely removal of condensate drops at the microscale where the gravitational effect does not work. The latest research has indicated that these small-scale condensate microdrops may self-remove via mutual coalescence as long as the coalescence-released excess surface energy is larger than the interface adhesion-induced energy dissipation. [31] Much effort has been devoted to exploring the utilization of knowledge of bionic low-adhesivity superhydrophobicity to develop innovative condensate microdrop self-propelling (CMDSP) surfaces. Different from traditional superhydrophobic surfaces, which are characterized by the bouncing or rolling off of deposited millimeter-size large drops, [32,33] CMDSP surfaces support the self-removal capability of smallscale condensate microdrops. It has been reported that classical superhydrophobic lotus leaves (Figure 1a), [34][35][36][37] as well as artificial surfaces consisting of hierarchical micro-and nanostructures, [38] one-tier microstructures, [39][40][41][42][43] or nanostructures [44,45] with larger characteristic interspaces, present a low-adhesivity property to the deposited water macrodrops, but become highly adhesive to condensed microdrops (Figure 1b). This is because moisture easily penetrates the microscale valleys or cavities. Clearly, superhydrophobic surfaces with irrationally designed surface structures can enhance the solid-liquid interfacial adhesion instead of promoting the rapid removal of condensed drops. Accordingly, it is still a challenge to design and fabricate very effective low-adhesivity superhydrophobic surfaces with the self-removal ability of condensate microdrops. Recently, there has been a large breakthrough in understanding the mechanism and construction rules of bionic CMDSP surfaces, leading to the exploration of fabrication methods for the surface functionalization of widely used metal materials and the Bionic condensate microdrop self-propelling (CMDSP) surfaces are attracting increased attention as novel, low-adhesivity superhydrophobic surfaces due to their value in fundamental research and technological innovation, e.g., for enhancing heat transfer, energy-effective antifreezing, and...

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Can Metal Matrix‐Hydrophobic Nanoparticle Composites Enhance Water Condensation by Promoting the Dropwise Mode?

Cited by 15 publications

References 85 publications

Liquid-Vapor Phase-Change Heat Transfer on Functionalized Nanowired Surfaces and Beyond

Liquid-Vapor Phase-Change Heat Transfer on Functionalized Nanowired Surfaces and Beyond

Bioinspired Interfacial Materials with Enhanced Drop Mobility: From Fundamentals to Multifunctional Applications

Recent Progress in Bionic Condensate Microdrop Self‐Propelling Surfaces

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