Bioinspired Surfaces with Special Wettability

Sun, Taolei; Feng, Lin; Gao, Xuefeng; Jiang, Lei

doi:10.1021/ar040224c

Cited by 1,942 publications

(1,164 citation statements)

References 69 publications

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“…[46] In the past two decades, there have been great breakthroughs in research into bionic superwettable surfaces, leading to promising solutions to issues arising in daily life and industry. [15][16][17][18][19][47][48][49] Herein, we show biological inspirations that guide the design and creation of CMDSP surfaces that own the remarkable self-removal ability of small-scale condensate microdrops. Gao et al [5] first reported that closely packed nanocones on the surface of mosquito eyes are fully nonsticky to condensed microdrops (Figure 1c-e), showing a dry-style antifogging function.…”

Section: Biological Prototypes Of Cmdsp Surfacesmentioning

confidence: 98%

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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Section: Biological Prototypes Of Cmdsp Surfacesmentioning

confidence: 98%

Recent Progress in Bionic Condensate Microdrop Self‐Propelling Surfaces

2017

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“…[14,15] Also, many of these smart materials have surfaces that dynamically alter their physicochemical properties in response to changes in their environmental conditions and a triggered control of interfacial properties at the solid/water interface can be found in ion channels, [13] directional surface motions, [16] and bioinspired, smart surfaces with controllable wettability and adhesion. [17,18] The self-cleaning effect of lotus leaves, [19] the anisotropic de-wetting behavior of rice leaves, [20] the superhydrophobic forces exerted by a water strider's leg, [21] the attachment mechanism of geckos, [22] and many other natural phenomena are all related to unique micro-and nanostructures on surfaces. [23][24][25][26][27][28] The creation of such complex functionalities in bioinspired materials depends on well-ordered multiscale structures.…”

Section: Introductionmentioning

confidence: 99%

Bio‐Inspired, Smart, Multiscale Interfacial Materials

2008

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In this review a strategy for the design of bioinspired, smart, multiscale interfacial (BSMI) materials is presented and put into context with recent progress in the field of BSMI materials spanning natural to artificial to reversibly stimuli‐sensitive interfaces. BSMI materials that respond to single/dual/multiple external stimuli, e.g., light, pH, electrical fields, and so on, can switch reversibly between two entirely opposite properties. This article utilizes hydrophobicity and hydrophilicity as an example to demonstrate the feasibility of the design strategy, which may also be extended to other properties, for example, conductor/insulator, p‐type/n‐type semiconductor, or ferromagnetism/anti‐ferromagnetism, for the design of other BSMI materials in the future.

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“…For the droplets to roll away easily, a low hysteresis is required. The lotus leaf and many other plant surfaces demonstrate this property and have provided a model for many self-cleaning materials (Barthlott and Neinhuis 1997;Sun et al 2005;Liu and Jiang 2011). These leaves possess a micro/nano architecture which reduces the contact area of particles with the surface and thus physical adhesion forces via van der Waals are also reduced.…”

Section: Introductionmentioning

confidence: 99%

Fouling of nanostructured insect cuticle: adhesion of natural and artificial contaminants

Watson

Cribb

et al. 2011

Biofouling

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The adhesional properties of contaminating particles of scales of various lengths were investigated for a wide range of micro-and nanostructured insect wing cuticles. The contaminating particles consisted of artificial hydrophilic (silica) and spherical hydrophobic (C 18 ) particles, and natural pollen grains. Insect wing cuticle architectures with an open micro-/nanostructure framework demonstrated topographies for minimising solid-solid and solid-liquid contact areas. Such structuring of the wing membranes allows for a variety of removal mechanisms to contend with particle contact, such as wind and self-cleaning droplet interactions. Cuticles exhibiting high contact angles showed considerably lower particle adhesional forces than more hydrophilic insect surfaces. Values as low as 3 nN were recorded in air for silica of *28 nm in diameter and 525 nN for silica particles 30 mm in diameter. A similar adhesional trend was also observed for contact with pollen particles.

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Bioinspired Surfaces with Special Wettability

Cited by 1,942 publications

References 69 publications

Recent Progress in Bionic Condensate Microdrop Self‐Propelling Surfaces

Recent Progress in Bionic Condensate Microdrop Self‐Propelling Surfaces

Bio‐Inspired, Smart, Multiscale Interfacial Materials

Fouling of nanostructured insect cuticle: adhesion of natural and artificial contaminants

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