Condensate Microdrop Self-Propelling Aluminum Surfaces Based on Controllable Fabrication of Alumina Rod-Capped Nanopores

Zhao, Yang; Luo, Yuting; Li, Juan; Yin, Fei; Zhu, Jie; Gao, Xuefeng

doi:10.1021/acsami.5b03016

Cited by 56 publications

(58 citation statements)

References 29 publications

(49 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…First, the interspaces of the building blocks should be as small as possible, e.g., sub-micrometer scale, to avoid moisture penetration. [66][67][68][69] Second, their tip size should be as small as possible to minimize the interface adhesion. [31,50,51,[66][67][68][69] Third, the building blocks must have a certain height or depth to avoid the collapse of the suspended water bridges.…”

Section: Construction Rules Of Bionic Cmdsp Surfacesmentioning

confidence: 99%

“…[31,50,51,[66][67][68][69] Third, the building blocks must have a certain height or depth to avoid the collapse of the suspended water bridges. [68] Following these design principles and inspired by nature, our group proposed and demonstrated that efficient self-propelling of small-scale condensed microdrops can be [5] Copyright 2007, Wiley-VCH. e) AFM image of closely packed conical nanonipples.…”

Section: Construction Rules Of Bionic Cmdsp Surfacesmentioning

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%

“…Similarly, various wetchemistry methods have been developed for the in situ growth of bionic CMDSP nanostructures on the surfaces of metal materials. [20][21][22][23][24][27][28][29]31,[66][67][68]70,[72][73][74][75][76]87] It is known that copper and aluminum are the most widely used metal materials, and the latest advances in their surface functionalization have shown remarkable potential in energy-related applications. Accordingly, we will briefly review recent progress in metal-based CMDSP surfaces.…”

Section: Metal-based Cmdsp Surfacesmentioning

confidence: 99%

“…Recently, our group reported a type of aluminum-based CMDSP functional film that is based on the controllable fabrication of an anodicalumina rod-capped nanopore structure (Figure 4a,b) and made by multistep anodization and etching. [68] However, this method is time consuming. To address this issue, we further developed a one-step voltage-rising mild anodization method (Figure 4c,d).…”

Section: Aluminum-based Cmdsp Surfacesmentioning

confidence: 99%

See 4 more Smart Citations

Recent Progress in Bionic Condensate Microdrop Self‐Propelling Surfaces

2017

Self Cite

View full text Add to dashboard Cite

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...

show abstract

Section: Construction Rules Of Bionic Cmdsp Surfacesmentioning

confidence: 99%

Section: Construction Rules Of Bionic Cmdsp Surfacesmentioning

confidence: 99%

Section: Construction Rules Of Bionic Cmdsp Surfacesmentioning

confidence: 99%

Section: Metal-based Cmdsp Surfacesmentioning

confidence: 99%

Section: Aluminum-based Cmdsp Surfacesmentioning

confidence: 99%

See 3 more Smart Citations

Recent Progress in Bionic Condensate Microdrop Self‐Propelling Surfaces

2017

Self Cite

View full text Add to dashboard Cite

show abstract

Bio‐Inspired Superhydrophobic Closely Packed Aligned Nanoneedle Architectures for Enhancing Condensation Heat Transfer

Wang

Zhu

Meng

et al. 2018

Adv Funct Materials

View full text Add to dashboard Cite

Bionic condensate microdrop self‐propelling (CMDSP) surfaces are attracting intensive interest due to their academic and commercial values. Up to now, it is still a great challenge to design and fabricate CMDSP nanostructures with superior condensation heat transfer (CHT) efficiency. Here, it is reported that the CHT coefficient of copper surfaces can be enhanced maximally ≈320% via in situ growth and geometric regulation of closely packed aligned nanoneedles with CMDSP function. These experiments and theoretical analyses indicate that reducing the interspaces of nanoneedles can help reduce the departure diameters of condensate microdrops and increase their nucleation density, both of which are beneficial to enhance CHT. In contrast, increasing the tip size and height of nanoneedles can increase drop departure diameters and film‐layer thermal resistance, respectively, either of which is disadvantageous to enhance CHT. Clearly, only considering superhydrophobic effect is insufficient and both choosing ideal nanoarchitectures and optimizing their geometric parameters are very crucial to realize high‐efficiency CHT, which optimization can be achieved via simply controlling growth time of nanostructures. These findings offer new insights into the design and development of first‐rank CHT interface nanomaterials.

show abstract

Hierarchical Engineering of Sorption‐Based Atmospheric Water Harvesters

et al. 2023

View full text Add to dashboard Cite

Harvesting water from air in sorption‐based devices is a promising solution to decentralized water production, aiming for providing potable water anywhere, anytime. This technology involves a series of coupled processes occurring at distinct length scales, ranging from nanometer to meter and even larger, including water sorption/desorption at the nanoscale, condensation at the mesoscale, device development at the macroscale and water scarcity assessment at the global scale. Comprehensive understanding and bespoke designs at every scale are thus needed to improve the water‐harvesting performance. For this purpose, a brief introduction of the global water crisis and its key characteristics is provided to clarify the impact potential and design criteria of water harvesters. Next the latest molecular‐level optimizations of sorbents for efficient moisture capture and release are discussed. Then, novel microstructuring of surfaces to enhance dropwise condensation, which is favorable for atmospheric water generation, is shown. After that, system‐level optimizations of sorbent‐assisted water harvesters to achieve high‐yield, energy‐efficient, and low‐cost water harvesting are highlighted. Finally, future directions toward practical sorption‐based atmospheric water harvesting are outlined.

show abstract

Condensate Microdrop Self-Propelling Aluminum Surfaces Based on Controllable Fabrication of Alumina Rod-Capped Nanopores

Cited by 56 publications

References 29 publications

Recent Progress in Bionic Condensate Microdrop Self‐Propelling Surfaces

Recent Progress in Bionic Condensate Microdrop Self‐Propelling Surfaces

Bio‐Inspired Superhydrophobic Closely Packed Aligned Nanoneedle Architectures for Enhancing Condensation Heat Transfer

Hierarchical Engineering of Sorption‐Based Atmospheric Water Harvesters

Contact Info

Product

Resources

About