Direct Measure of the Surface Excess and Structure of Photo-Switchable Molecules at Air-Water Interfaces
The molecular properties of photo-responsive foams attract considerable interest. Foams are inherently interface-controlled materials and their ability to respond to light stimuli is coupled with the ability to change the interfacial molecular structure. Because light can be localized in time and space, photo-responsive interfaces offer exciting new possibilities to control foams in four dimensions. In order to improve the switching ability of air-water interfaces - as a major building block of aqueous foam - we have performed precision synthesis of photo-switches such as arylazopyrazoles (AAP). These are superior to azobenzene surfactants with increased thermal stability and a favorable photo-stationary state. Surface tension and vibrational sum-frequency generation (SFG) experiments have shown the AAP's ability to change both the surface tension and the charging state reversibly by photo-isomerization. Direct quantitative information on the change in surface excess and structure under light irradiation is missing so far and is gained by the proposed NR experiments. Further, we plan to prepare a manuscript where we add complementary information from SFG and tensiometry.
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B. Braunschweig; Richard A. Campbell; GLIKMAN Dana; GUTFREUND Philipp; HONNIGFORT Christian; RAVOO Bart Jan; SCHNURBUS Marco and TUMMINO Andrea. (2018). Direct Measure of the Surface Excess and Structure of Photo-Switchable Molecules at Air-Water Interfaces. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-12-540
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