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Self-Propelled Aero-GaN Based Liquid Marbles Exhibiting Pulsed Rotation on the Water Surface

1
National Center for Materials Study and Testing, Technical University of Moldova, Stefan cel Mare Av. 168, 2004 Chisinau, Moldova
2
Institute for Materials Science, Kiel University, Kaiserstr. 2, 24143 Kiel, Germany
3
Research Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8011, Japan
4
Department of Physics and Engineering, State University of Moldova, Alexei Mateevici Str. 60, 2009 Chisinau, Moldova
5
Laboratory for Bioinspired, Bionic, Nano, Meta Materials & Mechanics, Department of Civil, Environmental and Mechanical Engineering, University of Trento, 38123 Trento, Italy
6
School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, UK
7
Academy of Sciences of Moldova, Stefan cel Mare Av. 1, 2001 Chisinau, Moldova
*
Author to whom correspondence should be addressed.
Academic Editor: Laura Campo-Deaño
Materials 2021, 14(17), 5086; https://doi.org/10.3390/ma14175086
Received: 16 July 2021 / Revised: 2 September 2021 / Accepted: 3 September 2021 / Published: 6 September 2021
(This article belongs to the Special Issue Biorheology at Micro- and Macro-Scales)
We report on self-propelled rotating liquid marbles fabricated using droplets of alcoholic solution encapsulated in hollow microtetrapods of GaN with hydrophilic free ends of their arms and hydrophobic lateral walls. Apart from stationary rotation, elongated-spheroid-like liquid marbles were found, for the first time, to exhibit pulsed rotation on water surfaces characterized by a threshold speed of rotation, which increased with the weight of the liquid marble while the frequency of pulses proved to decrease. To throw light upon the unusual behavior of the developed self-propelled liquid marbles, we propose a model which takes into account skimming of the liquid marbles over the water surface similar to that inherent to flying water lily beetle and the so-called helicopter effect, causing a liquid marble to rise above the level of the water surface when rotating. View Full-Text
Keywords: aerogalnite; aero-GaN; liquid marble; pulsed rotation aerogalnite; aero-GaN; liquid marble; pulsed rotation
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MDPI and ACS Style

Braniste, T.; Ciobanu, V.; Schütt, F.; Mimura, H.; Raevschi, S.; Adelung, R.; Pugno, N.M.; Tiginyanu, I. Self-Propelled Aero-GaN Based Liquid Marbles Exhibiting Pulsed Rotation on the Water Surface. Materials 2021, 14, 5086. https://doi.org/10.3390/ma14175086

AMA Style

Braniste T, Ciobanu V, Schütt F, Mimura H, Raevschi S, Adelung R, Pugno NM, Tiginyanu I. Self-Propelled Aero-GaN Based Liquid Marbles Exhibiting Pulsed Rotation on the Water Surface. Materials. 2021; 14(17):5086. https://doi.org/10.3390/ma14175086

Chicago/Turabian Style

Braniste, Tudor, Vladimir Ciobanu, Fabian Schütt, Hidenori Mimura, Simion Raevschi, Rainer Adelung, Nicola M. Pugno, and Ion Tiginyanu. 2021. "Self-Propelled Aero-GaN Based Liquid Marbles Exhibiting Pulsed Rotation on the Water Surface" Materials 14, no. 17: 5086. https://doi.org/10.3390/ma14175086

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