Self-regulating photochemical Rayleigh-Bénard convection using a highly-absorbing organic photoswitch

Serena Seshadri, Luke F. Gockowski, Jaejun Lee, Miranda Sroda, Matthew E. Helgeson, Javier Read de Alaniz () and Megan T. Valentine ()
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Serena Seshadri: University of California Santa Barbara
Luke F. Gockowski: University of California Santa Barbara
Jaejun Lee: University of California Santa Barbara
Miranda Sroda: University of California Santa Barbara
Matthew E. Helgeson: University of California Santa Barbara
Javier Read de Alaniz: University of California Santa Barbara
Megan T. Valentine: University of California Santa Barbara

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract We identify unique features of a highly-absorbing negatively photochromic molecular switch, donor acceptor Stenhouse adduct (DASA), that enable its use for self-regulating light-activated control of fluid flow. Leveraging features of DASA’s chemical properties and solvent-dependent reaction kinetics, we demonstrate its use for photo-controlled Rayleigh-Bénard convection to generate dynamic, self-regulating flows with unparalleled fluid velocities (~mm s−1) simply by illuminating the fluid with visible light. The exceptional absorbance of DASAs in solution, uniquely controllable reaction kinetics and resulting spatially-confined photothermal flows demonstrate the ways in which photoswitches present exciting opportunities for their use in optofluidics applications requiring tunable flow behavior.

Date: 2020
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DOI: 10.1038/s41467-020-16277-7

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