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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 (?? = 27 mN m-1) and surface excess (?? > 2.9 ?mol 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 monolayer-to-bilayer transition. This exceptional behavior is further shown to have dramatic consequences at larger length scales as highlighted by applications like the light-triggered collapse of aqueous foam which is tuned from high (>1 h) to low (<10 min) stabilities and light-actuated particle motion via Marangoni flows.

SUBMITTER: Honnigfort C 

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

REPOSITORIES: biostudies-literature

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

Honnigfort Christian C   Campbell Richard A RA   Droste Jörn J   Gutfreund Philipp P   Hansen Michael Ryan MR   Ravoo Bart Jan BJ   Braunschweig Björn B  

Chemical science 20200108 8


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 <i>n</i>-butyl-arylazopyrazole butyl sulfonate (butyl-AAP-C<sub>4</sub>S) surfactant that can change its structure at the air-water interface by <i>E</i>/<i>Z</i> photo-isomerization in an unprecedented way. Large and reversible changes in surface tension (Δ<i>γ</i> = 27 mN m<sup>-1</sup>) and surfac  ...[more]

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