Self‐Assembly of Large‐Scale Micropatterns on Aligned Carbon Nanotube Films

Liu, Huan; Li, Shuhong; Zhai, Jin; Li, Huanjun; Zheng, Quanshui; Jiang, Lei; Zhu, Daoben

doi:10.1002/anie.200351988

Cited by 176 publications

(167 citation statements)

References 34 publications

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“…On the other hand, geometric structures including rough structures and regular micro/nano patterns are also crucial [13,14]. To obtain polymer regular micro/ nano geometric surfaces, various nanoprocessing approaches can be employed, including nanoporous template wetting [15], capillary lithography [16], nanoimprint lithography [17], microstereolithography [18], template rolling press [19], and water spreading of carbon nanotubes [20]. A number of theoretical and experimental studies indicated that polymer aligned nanopillar arrays or carbon nanotube arrays could exhibit hydrophobic or surperhydrophobic feature [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Wettability transition of plasma-treated polystyrene micro/nano pillars-aligned patterns

Kong¹,

Yung²,

Xu³

et al. 2010

Express Polym. Lett.

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Abstract. This paper reports the wettability transition of plasma-treated polystyrene (PS) micro/nano pillars-aligned patterns. The micro/nano pillars were prepared using hot embossing on silicon microporous template and alumina nanoporous template, which were fabricated by ultraviolet (UV) lithography and inductive coupled plasma (ICP) etching, and two-step anodic oxidation, respectively. The results indicate that the combination of micro/nano patterning and plasma irradiation can easily regulate wettabilities of PS surfaces, i.e. from hydrophilicity to hydrophobicity, or from hydrophobicity to superhydrophilicity. During the wettability transition from hydrophobicity to hydrophilicity there is only mild hydrophilicity loss. After plasma irradiation, moreover, the wettability of PS micro/nano pillars-aligned patterns is more stable than that of flat PS surfaces. The observed wettability transition and wettability stability of PS micro/nano pillars-aligned patterns are new phenomena, which may have potential in creating programmable functional polymer surfaces.

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Section: Introductionmentioning

confidence: 99%

Wettability transition of plasma-treated polystyrene micro/nano pillars-aligned patterns

Kong¹,

Yung²,

Xu³

et al. 2010

Express Polym. Lett.

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“…This situation is important for practical situations in microtechnologies since microstructures are often dried out of a solvent and brought to pierce the liquid interface during the evaporation process. Recent experiments with wet carbon nanutubes [9][10][11][12][13], ZnO [14] or Si [15][16][17] nanorods 'carpets' and polymeric micro-pilars arrays [18][19][20][21][22] exhibit a surprising large variety of bundle structures ranging from 'tepee' shapes to cellular patterns. Surprising helicoidal structures have also recently been observed with soft PDMS carpets [23].…”

mentioning

confidence: 99%

Piercing an interface with a brush: Collaborative stiffening

Chiodi¹,

Roman²,

Bico³

2010

EPL

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Abstract. -The hairs of a painting brush withdrawn from a wetting liquid self-assemble into clumps whose sizes rely on a balance between liquid surface tension and hairs bending rigidity. Here we study the situation of an immersed carpet in an evaporating liquid bath : the free extremities of the hairs are forced to pierce the liquid interface. The compressive capillary force on the tip of flexible hairs leads to buckling and collapse. However we find that the spontaneous association of hairs into stronger bundles may allow them to resist capillary buckling. We explore in detail the different structures obtained and compare them with similar patterns observed in micro-structured surfaces such as carbon nanotubes "forests".Introduction. -Everyday's life experience teaches us that wet hairs assemble into bundles. This phenomenon is however amplified at the scale of Micro-Electro-MechanicalSystems (MEMS) since surface forces tend to dominate over bulk forces when the scale is reduced. Indeed, if L is the typical size of a structure, surface forces are proportional to L, while elastic or gravity forces scale as L 2 and L 3 , respectively. Controlling 'stiction' is then a challenging issue in micro-engineering technologies since it often leads to the fatal collapse of microstructures [6][7][8]. Nevertheless, the self-assembly of micro-structures through capillary forces can also be viewed as a useful tool to build complex shapes [1][2][3][4][5]. Beyond engineering applications, surface forces may also have a strong effect on living structures. For instance, filamentous fungi living in aqueous environment have difficulty in growing their hypha through the water interface into the air. Indeed some species have to produce surfactant molecules that reduce capillary forces in order to develop the aerial structures necessary for dissemination [24].In the case of slender structures, the interaction between elasticity and interfacial forces can be defined by a typical elastocapillary length scale, L EC = B/γ ∼ Eh 3 /γ, where E is the Young modulus of the material, h and B are the thickness and the bending stiffness per unit width of the structure, respectively, and γ the liquid surface tension or the solid adhesion energy [25][26][27][28][29]. The validity of this macroscopic length scale has recently been confirmed at the scale of graphene sheets through atomistic simulations [30].In this paper we study the case of a carpet-like structure immersed in a drying liq-

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“…One example is the self-assembly of aligned carbon nanotubes (ACNTs) into micropatterns via water spreading (Figure 6c). [33,34] ACNTs with an apparent high water contact angle of ≈158.5 ± 1.5° can be wetted over time due to the Figure 6. Elastocapillary self-assembly of fibers into diverse architectures.…”

Section: Wet Hairs: Capillary-induced Fiber Self-assemblymentioning

confidence: 99%

“…c) Self-assembly of densely packed ACNTs. [33,34] c 1 ) SEM images of ACNTs before and after the self-assembly induced by water spreading. Inset: cross-sectional view.…”

Section: Wet Hairs: Capillary-induced Fiber Self-assemblymentioning

confidence: 99%

Bioinspired Dynamic Wetting on Multiple Fibers

et al. 2017

Self Cite

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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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Self‐Assembly of Large‐Scale Micropatterns on Aligned Carbon Nanotube Films

Cited by 176 publications

References 34 publications

Wettability transition of plasma-treated polystyrene micro/nano pillars-aligned patterns

Wettability transition of plasma-treated polystyrene micro/nano pillars-aligned patterns

Piercing an interface with a brush: Collaborative stiffening

Bioinspired Dynamic Wetting on Multiple Fibers

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