Super‐Hydrophobic Surfaces: From Natural to Artificial

Feng, Lin; Li, Shuhong; Li, Yingshun; Li, Huanjun; Zhang, Lingjuan; Zhai, Jin; Song, Yanlin; Liu, Biqian; Jiang, Lei; Zhu, Daoben

doi:10.1002/adma.200290020

Cited by 4,031 publications

(2,351 citation statements)

References 30 publications

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“…[13] As a result, the surface superhydrophobicity of PDMS-treated AK 1 should be attributed to the low surface energy of the silicon coating in combination with the microstructures of carbon particles, which are key factors for surface superhydrophobicity. [32] The absorption capacity of PDMS-treated AK 1 for different organic solvents was also investigated (see the Supporting Information, Figure S2). However, for a variety of organic solvents, PDMS-treated AK 1 showed low absorbencies in the range 66-483 wt %.…”

Section: Resultsmentioning

confidence: 99%

Superhydrophobic Activated Carbon‐Coated Sponges for Separation and Absorption

Sun¹,

An²,

Zhu³

et al. 2013

ChemSusChem

194

105

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Highly porous activated carbon with a large surface area and pore volume was synthesized by KOH activation using commercially available activated carbon as a precursor. By modification with polydimethylsiloxane (PDMS), highly porous activated carbon showed superhydrophobicity with a water contact angle of 163.6°. The changes in wettability of PDMS‐ treated highly porous activated carbon were attributed to the deposition of a low‐surface‐energy silicon coating onto activated carbon (confirmed by X‐ray photoelectron spectroscopy), which had microporous characteristics (confirmed by XRD, SEM, and TEM analyses). Using an easy dip‐coating method, superhydrophobic activated carbon‐coated sponges were also fabricated; those exhibited excellent absorption selectivity for the removal of a wide range of organics and oils from water, and also recyclability, thus showing great potential as efficient absorbents for the large‐scale removal of organic contaminants or oil spills from water.

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Section: Resultsmentioning

confidence: 99%

Superhydrophobic Activated Carbon‐Coated Sponges for Separation and Absorption

Sun¹,

An²,

Zhu³

et al. 2013

ChemSusChem

194

105

View full text Add to dashboard Cite

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“…Inspired by nature, [1][2][3][4][5][6][7][8][9][10][11][12][13][14] the special wettability of material surfaces, which is engineered via synergistic utilization of microscale surface structures and surface chemistry has been one of the most active research fields, and it can play a key role in addressing problems related to energy, environment, resources, and health. Efforts in the past decades have explored controllable fabrication, functionality, and performance optimization of bionic superhydrophobic surfaces with a contact angle above 150°, and they have resulted in technological innovations such as self-cleaning, drag-reduction, anticorrosion, antifogging, antifreezing and oil-water separation.…”

Section: Introductionmentioning

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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“…Many natural systems have evolved into functional surfaces to achieve water transport for survival, [1][2][3][4][5][6][7][8][9][10] for example, the back of desert beetles, [1] shorebird beaks, [3] spider silk, [5] and cactus spines. [6] Without energy input, these biological surfaces can harness the movement of water through their unique structural features and chemical composition, [11][12][13] which gives inspiration for designing and fabricating functional surfaces and materials with wide applications in fields including antifogging and fog-collection, [14][15][16] microfluidic devices, [17][18][19][20][21] lubrication, [22,23] and liquid transport.…”

Section: Introductionmentioning

confidence: 99%

Surfaces Inspired by the Nepenthes Peristome for Unidirectional Liquid Transport

et al. 2017

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The slippery peristome of the pitcher plant Nepenthes has attracted much attention due to its unique function for preying on insects. Recent findings on the peristome surface of Nepenthes alata demonstrate a fast and continuous unidirectional liquid transport, which is enabled by the combination of a pinning effect at the sharp edges and a capillary rise in the wedge, deriving from the multiscale structure, which provides inspiration for designing and fabricating functional surfaces for unidirectional liquid transport. Developments in the fabrication methods of peristome‐inspired surfaces and control methods for liquid transport are summarized. Both potential applications in the fields of microfluidic devices, biomedicine, and mechanical engineering and directions for further research in the future are discussed.

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Super‐Hydrophobic Surfaces: From Natural to Artificial

Cited by 4,031 publications

References 30 publications

Superhydrophobic Activated Carbon‐Coated Sponges for Separation and Absorption

Superhydrophobic Activated Carbon‐Coated Sponges for Separation and Absorption

Recent Progress in Bionic Condensate Microdrop Self‐Propelling Surfaces

Surfaces Inspired by the Nepenthes Peristome for Unidirectional Liquid Transport

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