Unexpected monolayer-to-bilayer transition of arylazopyrazole surfactants facilitates superior photo-control of fluid interfaces and colloids.

ABSTRACT: Interfaces that can change their chemistry on demand have huge potential for applications and are prerequisites for responsive or adaptive materials. We report on the performance of a newly designed n-butyl-arylazopyrazole butyl sulfonate (butyl-AAP-C₄S) surfactant that can change its structure at the air-water interface by E/Z photo-isomerization in an unprecedented way. Large and reversible changes in surface tension (Δγ = 27 mN m^-1) and surface excess (ΔΓ > 2.9 μmol m^-2) demonstrate superior performance of the butyl-AAP-C₄S amphiphile to that of existing ionic surfactants. Neutron reflectometry and vibrational sum-frequency generation spectroscopy reveal that these large changes are caused by an unexpected mo

SUBMITTER: Honnigfort C 

PROVIDER: S-EPMC7059314 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature