Femtosecond laser induced hierarchical ZnO superhydrophobic surfaces with switchable wettability

Author(s): Jiale Yong ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Feng Chen ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Qing Yang ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Yao Fang ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Jinglan Huo ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Xun Hou ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵

Publication date (Electronic): 2015

Journal: Chemical Communications

Publisher: Royal Society of Chemistry (RSC)

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Abstract

A hierarchical rough ZnO layer is directly induced from the Zn substrate via a one-step femtosecond laser ablation and shows switchable wettability.

Abstract

A simple and one-step method to form a rough ZnO layer consisting of micro/nanoscale hierarchical structures via direct femtosecond laser ablation of the Zn surface is reported for the first time. The resultant surfaces show switchable wettability between superhydrophobicity and quasi-superhydrophilicity via alternate UV irradiation and dark storage.

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A reversible wet/dry adhesive inspired by mussels and geckos.

Haeshin Lee, Bruce P Lee, Phillip B. Messersmith (2007)

The adhesive strategy of the gecko relies on foot pads composed of specialized keratinous foot-hairs called setae, which are subdivided into terminal spatulae of approximately 200 nm (ref. 1). Contact between the gecko foot and an opposing surface generates adhesive forces that are sufficient to allow the gecko to cling onto vertical and even inverted surfaces. Although strong, the adhesion is temporary, permitting rapid detachment and reattachment of the gecko foot during locomotion. Researchers have attempted to capture these properties of gecko adhesive in synthetic mimics with nanoscale surface features reminiscent of setae; however, maintenance of adhesive performance over many cycles has been elusive, and gecko adhesion is greatly diminished upon full immersion in water. Here we report a hybrid biologically inspired adhesive consisting of an array of nanofabricated polymer pillars coated with a thin layer of a synthetic polymer that mimics the wet adhesive proteins found in mussel holdfasts. Wet adhesion of the nanostructured polymer pillar arrays increased nearly 15-fold when coated with mussel-mimetic polymer. The system maintains its adhesive performance for over a thousand contact cycles in both dry and wet environments. This hybrid adhesive, which combines the salient design elements of both gecko and mussel adhesives, should be useful for reversible attachment to a variety of surfaces in any environment.

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Water capture by a desert beetle.

A. R. Parker, C. Lawrence (2001)

Some beetles in the Namib Desert collect drinking water from fog-laden wind on their backs. We show here that these large droplets form by virtue of the insect's bumpy surface, which consists of alternating hydrophobic, wax-coated and hydrophilic, non-waxy regions. The design of this fog-collecting structure can be reproduced cheaply on a commercial scale and may find application in water-trapping tent and building coverings, for example, or in water condensers and engines.