Chinese Brushes: Controllable Liquid Transfer in Ratchet Conical Hairs

Wang, Qianbin; Su, Bin; Liu, Huan; Jiang, Lei

doi:10.1002/adma.201400865

Cited by 99 publications

(107 citation statements)

References 36 publications

(22 reference statements)

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“…[14] The controllable liquid transfer was severely impaired when the brush was trimmed, which indicated that the conical tip of the hair played a key role. We recently revealed that the most fundamental of the Chinese brush is the unique anisotropic multiscale structures of the FE-hairs, which feature a tapered architecture with an oriented squama covering (Figure 4a 2 ).…”

Section: Chinese Brush: Controllable Liquid Transfermentioning

confidence: 99%

“…Further research indicated that the high adhesive force for water and the large open angle of the pappi play crucial roles in the highly efficient water encapsulation. The former is useful for maintaining the [14] a 1 ) Controllable ink transfer was only achieved on qualified Chinese brushes with conical tips. a 2 ) SEM and AFM images of a single hair.…”

Section: Dandelion Pappi: Efficient Liquid Encapsulationmentioning

confidence: 99%

“…[2] The cactus spine was recently reported to be capable of collecting and directionally transporting droplets, [3] and spider silk can efficiently harvest water from humid air. [4] The distinctive conical structure of the individual natural fiber www.advmat.de www.advancedsciencenews.com on water strider legs, [12] directional liquid transport inspired by the shorebird beak, [13] controllable liquid transfer inspired by the Chinese brush, [14] highly efficient liquid encapsulation inspired by dandelion pappi, [15] and capillary-induced fiber self-assembly inspired by wet hairs. [16] We focus on multiple fibrous systems with different spatial distributions, which are more complicated and challenging but offer more possibilities for practical applications.…”

Section: Introductionmentioning

confidence: 99%

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Bioinspired Dynamic Wetting on Multiple Fibers

et al. 2017

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Natural fibers have versatile strategies for interacting with water media and better adapting to the local environment, and these strategies offer inspiration for the development of artificial functional fibers with diverse applications. Wetting on fibers is a dynamic liquid‐moving process on/in fibrous systems with various patterns, and the process is normally driven by the structural gradient, chemical gradient, elasticity of a single fiber, or the synergistic effect of these factors in multiple fibers in an integrated system in which the spatial geometry of the fibers is involved. Compared with the directional liquid movement on a single fiber, wetting on multiple fibers in both the micro‐ and macroscales is particularly fascinating, with various performances, including directional liquid transport, controllable liquid transfer, efficient liquid encapsulation, and capillary‐induced fibrous coalescence. Based on these properties, fibrous materials offer an alternative open system for liquid manipulation that is applicable to various functional liquid materials. Here, recent achievements in bioinspired dynamic wetting on multiple fibers are highlighted, and perspectives on future directions are presented.

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Section: Chinese Brush: Controllable Liquid Transfermentioning

confidence: 99%

Section: Dandelion Pappi: Efficient Liquid Encapsulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bioinspired Dynamic Wetting on Multiple Fibers

et al. 2017

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“…Without the conical fiber ends, Chinese brushes often show droplets at the ends of the brushes after they are removed from ink baths, where these remnant droplets may drop accidentally and leave stains on surfaces. 1 The conical ends of the fibers thus have an important role in controlling liquids within Chinese brushes. Understanding the physical principle behind the hydrostatics of liquids in Chinese brushes may guide the design of liquid-transfer devices.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4] In many cases, these devices are dipped in liquid baths and are then removed to keep liquids in the devices, just like Chinese calligraphic brushes, which are traditional writing and painting tools in East Asia. The fibers of Chinese brushes are cylindrical, except for their conical ends.…”

Section: Introductionmentioning

confidence: 99%

Bio-inspired flexible fiber brushes that keep liquids in a controlled manner by closing their ends

et al. 2016

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When brushes of flexible fibers are removed from liquid baths, these brushes sometimes show unwanted droplets at their ends, depending on the length, rigidity and shape of their fibers. Capillary forces arising from the varying cross-sections of conical fiber tips have been thought to eliminate the droplets. However, these forces may not operate with water, which fills the entire space between the fibers of a brush. Here, we theoretically show that brushes eliminate unwanted droplets with a physical mechanism that is significantly different from a single conical fiber by 'closing' their ends. We analyze the hydrostatics of water in a brush when it is removed from a bath, and we identify the condition under which the end of the brush is closed, emphasizing the roles played by the elastic deformation of the flexible fibers owing to interfacial forces. Moreover, this theory predicts that the volume of water that is captured by brushes is a non-monotonic function of the length of their fibers because the fibers show excluded volume interactions when their ends are 'closed'. This theory may guide the design of liquid-transfer devices that can retain liquids in a controlled manner.

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Bioinspired Superwettability Materials

Xiao

Wen

Jiang

2016

Kirk-Othmer Encyclopedia of Chemical Technology

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Naturally occurring structures such as spider silks, cactus spine, dandelion pappi, lotus leaves, butterfly wings, rose petals, gecko feet, and desert beetles possess unique properties and outstanding wettability characteristics, which are not yet well understood, but may provide inspiration for construction of superwettability materials. The focus of this article is on recent progress in application of bioinspired superwettability materials for diverse uses ranging from nanofibers, self‐cleaning materials, and chemical reaction interfaces to oil–water separation, patterning, and printing. The article begins by introducing one‐ and two‐dimensional naturally occurring structures with superwettability properties. Then, the fundamental principles of superwetting materials are discussed, followed by classification of superwettability materials based on the medium. The article discusses in detail the recent progress in application of bioinspired materials and provides a short conclusion and perspective.

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Chinese Brushes: Controllable Liquid Transfer in Ratchet Conical Hairs

Cited by 99 publications

References 36 publications

Bioinspired Dynamic Wetting on Multiple Fibers

Bioinspired Dynamic Wetting on Multiple Fibers

Bio-inspired flexible fiber brushes that keep liquids in a controlled manner by closing their ends

Bioinspired Superwettability Materials

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