Controlled Smart Anisotropic Unidirectional Spreading of Droplet on a Fibrous Surface

Zhang, Miaoxin; Lei, Wang; Hou, Yongping; Shi, Weiwei; Feng, Shile; Zheng, Yongmei

doi:10.1002/adma.201502143

Cited by 92 publications

(58 citation statements)

References 36 publications

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“…Beginning with the first record of capillary rise by Leonardo da Vinci in the Renaissance period (13), continuous interest has persisted for several centuries (14)(15)(16). Although much work has been performed in the last five centuries, issues as fundamental as the effects of substrate texture and surface superwettability are only recently being understood (17)(18)(19)(20). In addition to water elevation, spontaneous water transfer from one container to another is of great importance.…”

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confidence: 99%

Bioinspired inner microstructured tube controlled capillary rise

Dai

Gao

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

112

102

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Effective, long-range, and self-propelled water elevation and transport are important in industrial, medical, and agricultural applications. Although research has grown rapidly, existing methods for water film elevation are still limited. Scaling up for practical applications in an energy-efficient way remains a challenge. Inspired by the continuous water cross-boundary transport on the peristome surface of Nepenthes alata, here we demonstrate the use of peristome-mimetic structures for controlled water elevation by bending biomimetic plates into tubes. The fabricated structures have unique advantages beyond those of natural pitcher plants: bulk water diode transport behavior is achieved with a high-speed passing state (several centimeters per second on a milliliter scale) and a gating state as a result of the synergistic effect between peristomemimetic structures and tube curvature without external energy input. Significantly, on further bending the peristome-mimetic tube into a "candy cane"-shaped pipe, a self-siphon with liquid diode behavior is achieved. Such a transport mechanism should inspire the design of next generation water transport devices. biomimetic | capillary rise | diode | siphon | water transport

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mentioning

confidence: 99%

Bioinspired inner microstructured tube controlled capillary rise

Dai

Gao

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

112

102

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“…It has recently been revealed to have become a hot research area in the materials science world [1][2][3][4][5].…”

Section: Extended Abstractmentioning

confidence: 99%

“…It has recently been revealed to have become a hot research area in the materials science world [1][2][3][4][5].The capture silk of the cribellate spider Uloborus walckenaerius collects water through a combination of multiple gradients in a periodic spindle-knot structure after rebuilding. Inspired by the roles of micro-and nanostructures (MNs) in the water collecting ability of spider silk[2], a series of bioinspired gradient fibers has been designed by integrating fabrication methods and technologies such as dip-coating, Rayleigh instability break-up droplets, phase separation, strategies of combining electrospinning and electrospraying, and web-assembly.…”

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confidence: 99%

Bioinspired Wettability-Controlled Surfaces with Gradient Micro- and Nanostructures

Zheng¹

2017

Proceedings of the 2nd World Congress on New Technologies

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Extended AbstractBiological surfaces provide endless inspiration for design and fabrication of smart materials with unique wettability. It has recently been revealed to have become a hot research area in the materials science world [1][2][3][4][5].The capture silk of the cribellate spider Uloborus walckenaerius collects water through a combination of multiple gradients in a periodic spindle-knot structure after rebuilding. Inspired by the roles of micro-and nanostructures (MNs) in the water collecting ability of spider silk[2], a series of bioinspired gradient fibers has been designed by integrating fabrication methods and technologies such as dip-coating, Rayleigh instability break-up droplets, phase separation, strategies of combining electrospinning and electrospraying, and web-assembly. Through such fabrications, "spindleknot/joint" structures can be tailored to demonstrate the mechanism of multiple gradients (e.g., roughness, smooth, temperature-respond, photo-triggering, etc.,) in driving tiny water drops. A water capturing ability can be developed by the combination of "slope" and "curvature" effects on spindle-knots on bioinspired fiber. The heterostructured fibers have been fabricated by electrohydrodynamic strategies, are intelligently responding to environmental humidity. A temperatureresponsive fiber can realize the directional transport of droplet effectively. The multi-geometric gradient fiber achieves the droplet target transport in a long range along as-designed bioinspired gradient fiber. In contrast, biological surfaces such as plant leaves and butterfly wings with gradient structure features display the effect of water repellency. Smart bioinspired surfaces can be fabricated by combining machining, electrospinning, soft lithography, and nanotechnology. The gradient surfaces exhibit robust transport and controlling of droplets.These bioinspired wettability-controlled surfaces open promising applications into anti-icing, liquid transport, antifogging/self-cleaning, water harvesting, etc.

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“…Theo btained surface has such as pecial controllability in both surface microstructure and chemistry,w hich can be potentially used in many applications,f or example,a sthe platform for creating gradient wettings.R ecently,s urfaces with gradient wettability from the superhydrophobicity to superhydrophilicity have aroused much attention due to their particular ability in unidirectional droplet transportation, [11c] spreading, [23] and fog harvesting. [1a] However, almost all present gradient surfaces can only display aconstant gradient feature (for instance,g radient direction) and often are difficult to be reprogrammed.…”

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confidence: 99%

A Smart Superwetting Surface with Responsivity in Both Surface Chemistry and Microstructure

et al. 2018

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Recently, smart surfaces with switchable wettability have aroused much attention. However, only single surface chemistry or the microstructure can be changed on these surfaces, which significantly limits their wetting performances, controllability, and applications. A new surface with both tunable surface microstructure and chemistry was prepared by grafting poly(N-isopropylacrylamide) onto the pillar-structured shape memory polymer on which multiple wetting states from superhydrophilicity to superhydrophobicity can be reversibly and precisely controlled by synergistically regulating the surface microstructure and chemistry. Meanwhile, based on the excellent controllability, we also showed the application of the surface as a rewritable platform, and various gradient wettings can be obtained. This work presents for the first time a surface with controllability in both surface chemistry and microstructure, which starts some new ideas for the design of novel superwetting materials.

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Controlled Smart Anisotropic Unidirectional Spreading of Droplet on a Fibrous Surface

Abstract: Smart anisotropic-unidirectional spreading is displayed on a wettable-gradient-aligned fibrous surface due to a synergetic directing effect from the aligned structure and the ratio of hydrophilic components.

Cited by 92 publications

References 36 publications

Bioinspired inner microstructured tube controlled capillary rise

Bioinspired inner microstructured tube controlled capillary rise

Bioinspired Wettability-Controlled Surfaces with Gradient Micro- and Nanostructures

A Smart Superwetting Surface with Responsivity in Both Surface Chemistry and Microstructure

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