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Fedorets AA, Frenkel M, Legchenkova I, Shcherbakov DV, Dombrovsky LA, Nosonovsky M, Bormashenko E. Self-Arranged Levitating Droplet Clusters: A Reversible Transition from Hexagonal to Chain Structure. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:15330-15334. [PMID: 31663755 DOI: 10.1021/acs.langmuir.9b03135] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Water microdroplets condense over locally heated water-vapor interfaces and levitate in an ascending vapor-air flow forming self-assembled ordered monolayer clusters. The droplets do not coalesce due to complex aerodynamic interactions between them. The droplet cluster formation is governed by the condensation/evaporation balance and by coupling of heat flux and vapor flow with aerodynamic forces. Here, we report the observations of a reversible structural transition from the ordered hexagonal-structure cluster to the chain-like structure and provide an explanation of its mechanism and conditions under which the transition occurs. The phenomenon provides new insights on the fundamental physical and chemical processes with microdroplets including their role in reaction catalysis in nature and their potential for aerosol and microfluidic applications.
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Affiliation(s)
| | - Mark Frenkel
- Department of Chemical Engineering, Biotechnology and Materials, Engineering Sciences Faculty , Ariel University , Ariel 407000 , Israel
| | - Irina Legchenkova
- Department of Chemical Engineering, Biotechnology and Materials, Engineering Sciences Faculty , Ariel University , Ariel 407000 , Israel
| | | | - Leonid A Dombrovsky
- University of Tyumen , 6 Volodarskogo St. , Tyumen 625003 , Russia
- Joint Institute for High Temperatures , 17A Krasnokazarmennaya St. , Moscow 111116 , Russia
| | - Michael Nosonovsky
- University of Tyumen , 6 Volodarskogo St. , Tyumen 625003 , Russia
- Mechanical Engineering , University of Wisconsin-Milwaukee , 3200 North Cramer St. , Milwaukee , Wisconsin 53211 , United States
| | - Edward Bormashenko
- Department of Chemical Engineering, Biotechnology and Materials, Engineering Sciences Faculty , Ariel University , Ariel 407000 , Israel
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