Self-organized and self-propelled aero-GaN with dual hydrophilic-hydrophobic behaviour
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TIGINYANU, Ion; BRANIŞTE, Tudor; SMAZNA, Daria; DENG, Mao; SCHUTT, Fabian; SCHUCHARDT, Arnim; STEVENS-KALCEFF, MarionA.; RAEVSCHI, Simion; SCHURMANN, Ulrich; KIENLE, Lorenz; PUGNO, Nicola Maria; MISHRA, Yogendra Kumar; ADELUNG, Rainer. Self-organized and self-propelled aero-GaN with dual hydrophilic-hydrophobic behaviour. In: Nano Energy. 2019, nr. 56, pp. 759-769. ISSN 2211-2855.
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Nano Energy
Numărul 56 / 2019 / ISSN 2211-2855

Self-organized and self-propelled aero-GaN with dual hydrophilic-hydrophobic behaviour

DOI: 10.1016/j.nanoen.2018.11.049
Pag. 759-769

Tiginyanu Ion123, Branişte Tudor2, Smazna Daria1, Deng Mao1, Schutt Fabian1, Schuchardt Arnim1, Stevens-Kalceff MarionA.4, Raevschi Simion5, Schurmann Ulrich1, Kienle Lorenz1, Pugno Nicola Maria678, Mishra Yogendra Kumar1, Adelung Rainer1
1 Institute for Material Science, Christian-Albrechts- University of Kiel,
2 Technical University of Moldova,
3 Academy of Sciences of Moldova,
4 University of New South Wales,
5 State University of Moldova,
6 Universitatea din Trento,
7 Queen Mary University of London,
8 Italian Space Agency
Disponibil în IBN: 26 decembrie 2018


Nature utilizes hydrophilic-hydrophobic biomolecular entities to perform self-organized structural and functional tasks, including the formation of cellular compartments and motion, separation of chemicals or self-healing properties in a highly energy efficient manner. So far, no inorganic artificial micro/nanostructure units are known that self-organize and mimic such functions just by adding liquid. Here we develop the first nanomaterial exhibiting hydrophobic wetting and hydrophilic dewetting. Consisting of gallium nitride nanoscopically thin membranes shaped as hollow microtetrapods, which we term aerogalnite (AGaN), the nanomaterial is extremely porous, mechanically flexible, stretchable, and exhibits hydrophilicity under tension and hydrophobicity when compressed against water. Self-assembling the AGaN tetrapods on water enabled us to develop self-healing waterproof rafts carrying liquid droplets 500-times as heavy as rafts, and to demonstrate self-propelled liquid marbles exhibiting velocity of rotation as high as 750 rot/min. The specific force of the detachment of AGaN from the water surface was experimentally determined equal to 35 mN/cm2. The new developed material aerogalnite and its peculiar characteristics are promising for applications in sensorics, microfluidic devices and microrobotics.

3D network, Hollow tetrapods, Hydrophilic dewetting, Hydrophobic wetting, Self-assembling tetrapods on water, Gallium nitride