Structure and dynamic changes in the surface excess of arylazopyrazole surfactants at the air-water interface
The molecular properties of photo-responsive foams attract considerable interest. In order to improve the switching ability of the air-water interfaces, which are inherent to the stability of foams, we have synthesized a series of molecular arylazopyrazoles (AAP) photo-switches. In our recent experiment on FIGARO, we have demonstrated for the first time dramatic changes in the surface excess of AAPs following irradiation with UV vs. green light. In fact we were able to resolve their changes on a sub-minute time scale even for non-deuterated molecules. This raised the question of how chemical modification to a surfactant can result in such clear changes in the surface and foaming properties of photo-responsive materials. Here we propose to resolve unambiguously these effects by systematic chemical variations of the residues (octyl, butyl, H) at the arylazopyrazole center. For that, detailed quantitative information on the changes in surface excess in real time and the equilibrium structures of the three new molecules under light irradiation is required. This information can only be delivered by neutron reflectometry experiments, optimized on the FIGARO reflectometer at the ILL.
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B. Braunschweig; Richard A. Campbell; GLIKMAN Dana; GUTFREUND Philipp; HONNIGFORT Christian and SCHNURBUS Marco. (2019). Structure and dynamic changes in the surface excess of arylazopyrazole surfactants at the air-water interface. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1573
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