Strongly Anisotropic Wetting on One-Dimensional Nanopatterned Surfaces

Xia, Deying; Brueck, S. R. J.

doi:10.1021/nl801394w

Cited by 186 publications

(180 citation statements)

References 31 publications

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“…Anisotropic wetting may be useful for easy-clean coatings. 22 In summary, we have demonstrated that manipulation of surface properties can be done by the surface texturing of the thin urushiol film and the subsequent polymer brush growth. The surface showed superhydrophilicity because PMTAC polymer brushes were grown on the textured surface.…”

Section: ¹1mentioning

confidence: 86%

Polymer Brush Growth from Surface-textured Thin Urushiol Films

et al. 2014

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We have demonstrated the growth of polymer brushes from a surface-textured thin urushiol film. Thermal imprinting was done on an initiator-immobilized thin urushiol film, and surfaceinitiated atom-transfer radical polymerization (ATRP) of [2-(methacryloyloxy)ethyl]trimethylammonium chloride (MTAC) was conducted from it. The obtained surface showed superhydrophilicity because of the nature of polyelectrolyte polymer brushes on the textured surface. Since thin urushiol film can form on a variety of substrates, the concept shown here could be a universal approach for surface modifications of substrates."Urushi" (oriental lacquer) is a traditional natural resin that is often applied as a coating for wood or paper substrates. 1The main component in urushi, called urushiol, is a catechol derivative with a long unsaturated hydrocarbon side chain (Figure 1). 24 Catechol derivatives are also found in the adhesive protein in mussels that is currently attracting attention as biomimetic natural adhesives. 57 Since catechol derivatives can adhere on various substrates, these derivatives are useful as a universal surface modification method of various artificial materials. The advantage of urushiol over other catechol derivatives arises from the unique side chain. Thermal Diels Alder reactions and thermal addition reactions of the unsaturated hydrocarbon side chains accelerate the curing, 8,9 and thermal curing completes within minutes; in contrast, conventional oxidative polymerization of catechol derivatives requires over 12 h to cure. Moreover, the flexibility of the side chain imparts robustness to the cured material. 1012 Utilizing these characteristics, we demonstrated that thin urushiol films can serve as a universal, tough scaffold for grafting polymer brushes.11 Initiator-containing thin urushiol films were formed on various substrates, including polyolefins and thermosetting resins that are known as chemically inert materials to functionalize the surface. Then, polyelectrolyte polymer brushes were grafted from it. Since polymer brushes are candidate for surface modification, growing polymer brushes from various substrates widens the variety of applications.Surface properties are strongly influenced by its surface topography as well as chemical composition. 13 For example, water repellence of lotus leaves resulting in self-cleaning properties arises from micron-sized papillae coated with epicuticular waxes.14 By mimicking the design in nature, artificial functional surfaces were fabricated by the combination of the surface texturing and the following polymer brush growth. Although various techniques such as UV nanoimprintings, 15,16 photopatternings, 17 and patterned self-assembled monolayer (SAM) modifications 18,19 were used for surface texturing, they are subject to certain restrictions in various substrates. For example, SAM modification is generally useless for plastics. Moreover, several substrates such as polyolefins and thermosetting resins are difficult to apply to these techniques because of their chemic...

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Section: ¹1mentioning

confidence: 86%

Polymer Brush Growth from Surface-textured Thin Urushiol Films

et al. 2014

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“…directional) surface structures (e.g. grooves, pillars and nanowires) [7][8][9][10][11] or surface chemistry (e.g. hydrophilic/hydrophobic patterns).…”

Section: Introductionmentioning

confidence: 99%

Surface Textured Polymer Fibers for Microfluidics

Yıldırım

Yunusa

Öztürk

et al. 2014

Adv Funct Materials

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Cataloged from PDF version of article.This article introduces surface textured polymer fibers as a new platform for the fabrication of affordable microfluidic devices. Fibers are produced tens of meters-long at a time and comprise 20 continuous and ordered channels (equilateral triangle grooves with side lengths as small as 30 micrometers) on their surfaces. Extreme anisotropic spreading behavior due to capillary action along the grooves of fibers is observed after surface modification with polydopamine (PDA). These flexible fibers can be fixed on any surface - independent of its material and shape - to form three-dimensional arrays, which spontaneously spread liquid on predefined paths without the need for external pumps or actuators. Surface textured fibers offer high-throughput fabrication of complex open microfluidic channel geometries, which is challenging to achieve using current photolithography-based techniques. Several microfluidic systems are designed and prepared on either planar or 3D surfaces to demonstrate outstanding capability of the fiber arrays in control of fluid flow in both vertical and lateral directions. Surface textured fibers are well suited to the fabrication of flexible, robust, lightweight, and affordable microfluidic devices, which expand the role of microfluidics in a scope of fields including drug discovery, medical diagnostics, and monitoring food and water quality. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

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“…Anisotropic wettability has attracted more attentions of the research community. [1][2][3][4][5][6][7][8][9][10][11][12][13] Inspired by the natural microstructure like rice leaf, artificial anisotropic wetting surfaces have been studied recently. Dual-scale micro-nano structures have been prepared by different techniques and their wettability have been studied.…”

Section: Introductionmentioning

confidence: 99%

Switch isotropic/anisotropic wettability via dual-scale rods

et al. 2014

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It is the first time to demonstrate the comparison of isotropic/anisotropic wettability between dual-scale micro-nano-rods and single-scale micro-rods. Inspired by the natural structures of rice leaf, a series of micro-nano-rods and micro-rods with different geometric parameters were fabricated using micro-fabrication technology. Experimental measured apparent contact angles and advancing and receding contact angles from orthogonal orientations were characterized. The difference of contact angles from orthogonal orientation on dual-scale rods was much smaller than those on single-scale rods in both static and dynamic situation. It indicated that the dual-scale micro-nano-rods showed isotropic wettability, while single-scale micro-rods showed anisotropic wettability. The switch of isotropic/anisotropic wettability could be illustrated by different wetting state and contact line moving. It offers a facial way to switch isotropic/anisotropic wettability of the surface via dual-scale or single-scale structure.

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Strongly Anisotropic Wetting on One-Dimensional Nanopatterned Surfaces

Cited by 186 publications

References 31 publications

Polymer Brush Growth from Surface-textured Thin Urushiol Films

Polymer Brush Growth from Surface-textured Thin Urushiol Films

Surface Textured Polymer Fibers for Microfluidics

Switch isotropic/anisotropic wettability via dual-scale rods

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