Hierarchically structured porous aluminum surfaces for high-efficient removal of condensed water

He, Min; Zhou, Xin; Zeng, Xiping; Cui, Dapeng; Zhang, Qiaolan; Chen, Jing; Li, Huiling; Wang, Jianjun; Cao, Zexian; Song, Yanlin; Jiang, Lei

doi:10.1039/c2sm25828e

Cited by 149 publications

(150 citation statements)

References 15 publications

(15 reference statements)

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“…However, the experimental velocities of the self-jumped microdrops are apparently smaller than their theoretical values. Later, researchers noted that the energy dissipation caused by viscous flow (E vis ) and interface adhesion (E int ) must be considered, [31,[56][57][58][59][60] while gravi tational potential energy may be neglected due to microdrop sizes that are far smaller than the capillary length. Very recently, our group further found that, besides the solid-liquid van der Waals attraction, nanoscale line tension at three-phase contact lines cannot be neglected in calculating adhesioninduced dissipation.…”

Section: Cmdsp Mechanismmentioning

confidence: 99%

“…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%

“…Via synergistic control over the electrochemical parameters, such as reaction time, temperature, H 3 PO 4 concentration, and initial voltage, we can rapidly obtain alumina-rod-capped nanopore films that can exhibit extremely low solid-liquid adhesion and CMDSP functionality after hydrophobic treatment. In addition, other methods for engineering the surface of aluminum materials to have CMDSP functionality have been developed, e.g., by forming porous nanostructures (Figure 4e) via hot-water immersion and saline modification, [57] and by producing a polymer nanochain structure ( Figure 4f) via a facile spraying method. [79] These advances offer multiple avenues for developing aluminum-based CMDSP surfaces with self-cleaning, antifrosting, and anti-dewing functionality, e.g., those used in the design of energy-saving air-conditioner heat exchangers.…”

Section: Aluminum-based Cmdsp Surfacesmentioning

confidence: 99%

“…[79] These advances offer multiple avenues for developing aluminum-based CMDSP surfaces with self-cleaning, antifrosting, and anti-dewing functionality, e.g., those used in the design of energy-saving air-conditioner heat exchangers. [57,68,76,79,87] …”

Section: Aluminum-based Cmdsp Surfacesmentioning

confidence: 99%

Section: Enhanced Heat Transfermentioning

confidence: 99%

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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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