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Particle Flock Motion at Air-Water Interface Driven by Interfacial Free Energy Foraging.
Chen, Tianqi; Kondepudi, Dilip K; Dixon, James A; Rusling, James F.
  • Chen T; Department of Chemistry , University of Connecticut , Storrs , Connecticut 06269 , United States.
  • Kondepudi DK; Department of Chemistry , Wake Forest University , Winston-Salem , North Carolina 27109 , United States.
  • Dixon JA; Center for the Ecological Study of Perception & Action: (U-1020) , University of Connecticut , 406 Babbidge Road , Storrs , Connecticut 06269 , United States.
  • Rusling JF; Department of Chemistry , University of Connecticut , Storrs , Connecticut 06269 , United States.
Langmuir ; 35(34): 11066-11070, 2019 08 27.
Article en En | MEDLINE | ID: mdl-31381346
ABSTRACT
From flocks of birds and sheep to colonies of bacteria, complex patterns and self-motion are found in all hierarchies of nature. Artificial nonliving systems provide useful insight, since living systems are complicated and may involve cognitive issues not found in nonliving matter. Herein, we report naturally flocking irregularly shaped benzoquinone (BQ) particles on the air-water interface that cross a gate. In this open system designed with absence of external control, the particle flock moves by Marangoni "surfing" driven by slow dissolution of weakly surface active BQ postulated to create inhomogeneous interfacial tension fields. The particle flocks move collectively through a gate placed in the air-water interface to the side that has higher interfacial tension. Position-sensitive surface tension measurements used for the first time in a multiparticle Marangoni motion system show unequivocally that flock motion and gate crossing proceed to areas of slightly higher interfacial tension. Flock crossing is accompanied by a low-high differential interfacial tension change from one side of the gate to the other, with the flock moving to the side with higher interfacial tension. Thus, the flocks move because they are foraging for interfacial free energy.

Texto completo: 1 Banco de datos: MEDLINE Idioma: En Año: 2019 Tipo del documento: Article

Texto completo: 1 Banco de datos: MEDLINE Idioma: En Año: 2019 Tipo del documento: Article