Unexpected monolayer-to-bilayer transition of arylazopyrazole surfactants facilitates superior photo-control of fluid interfaces and colloids
| Autor: | Richard A. Campbell, Philipp Gutfreund, Michael Ryan Hansen, Christian Honnigfort, Jörn Droste, Björn Braunschweig, Bart Jan Ravoo |
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| Rok vydání: | 2020 |
| Předmět: |
Marangoni effect
Materials science Bilayer Ionic bonding 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surface tension Chemistry symbols.namesake Gibbs isotherm Pulmonary surfactant Chemical physics Monolayer symbols sense organs Neutron reflectometry skin and connective tissue diseases 0210 nano-technology |
| Zdroj: | Chemical Science Honnigfort, C, Campbell, R A, Droste, J, Gutfreund, P, Hansen, M R, Ravoo, B J & Braunschweig, B 2020, ' Unexpected monolayer-to-bilayer transition of arylazopyrazole surfactants facilitates superior photo-control of fluid interfaces and colloids ', Chemical Science, vol. 11, no. 8, pp. 2085-2092 . https://doi.org/10.1039/C9SC05490A 'Chemical Science ', vol: 11, pages: 2085-2092 (2020) |
| ISSN: | 2041-6539 2041-6520 |
| Popis: | E/Z photo-isomerization of a new surfactant causes substantial changes in interfacial properties, which are a prerequisite for responsive and adaptive material control on a molecular level. 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 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 ( |
| Databáze: | OpenAIRE |
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