Influence of Polarity Change and Photophysical Effects on Photosurfactant-Driven Wetting

Abstract

Photosurfactants have shown considerable promise for enabling stimuli-responsive control of the properties and motion of fluid interfaces. Recently, a number of photoswitch chemistries have emerged to tailor the photoresponsive properties of photosurfactants. However, systematic studies investigating how photoresponsive surfactant behavior depends on the photo- chemical and photophysical properties of the switch remain scarce. In this work, we develop synthetic schemes and surfactant designs to produce a well-controlled library of photosurfactants to comparatively assess the behavior of photoswitch chemistry on interfacial behavior. We employ photoinduced spreading of droplets at fluid interfaces as a model for such studies. We show that although photosurfactant response is largely guided by expected trends with changes in polarity of the photoswitch, interfacial behavior also depends nontrivially and sometimes counter-intuitively on the kinetics and mechanisms of photoswitching, particularly at the interface of two solvents, as well as on complex interactions with other surfactants. Understanding these complexities enables the design of new photosurfactant systems and their optimization toward responsive functions including triggered spreading, dewetting, and destabilization of droplets on solid and fluid surfaces.

ICB Affiliated Authors

Authors
Serena Seshadri, Sophia J. Bailey, Lei Zhao, Julia Fisher, Miranda Sroda, Michelle Chiu,
Friedrich Stricker, Megan T. Valentine, Javier Read de Alaniz and Matthew E. Helgeson
Date
Type
Peer-Reviewed Article
Journal
LANGMUIR
Volume
37
Number
33
Pages
9939-9951
Emblems