Photoinduced Motions and Mass Migrations

1 Photomechanicd Effects in Azobenzene Polymer Monolayers 15.4.1.1 Macrosize Effect 

10 Photoindiiced expansion and contraction of 6AzlO-FVA monolayer at the air-water interface. The area changes of an isolated domain can be visualiied in situ by Brewster angle microscopy. (From reference 52 copyright permission from the American Chemical Society.) 

To date, almost all attention has been paid to the macroscopic behavior at a centimeter level film area and surface pressure) obtained with a Langmuir film balance. The photoinduced response at a molecular level, on the other hand, is obtainable by UV-visible absorption spectroscopy and surface-potential measurements. In these contexts, our attention recently has been paid to microscopic observations that cover the ranges between the previously cited scale levels using 6Azn-PVA monolayers. 

The morphologies on solid surfaces can be monitored by atomic force microscopy (AFM). AFM and BAM take images at a resolution of a nanometer (in height profiles) and micrometer level, respectively. Therefore, visualization by these two microscopic methods provides complementary information. 

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