Crystal downsizing of organic solids has attracted significant attention due to their applications in the fields of electronics, pharmaceutical industry and materials science. Of interest are crystalline photo responsive materials that can undergo size-dependent solid to solid photochemical reactions with possibility of converting light energy to mechanical work while maintaining their crystallinity. In this context, studies that measure elasticity (Young’s Modulus) of these solids at the nanoscale are important but challenging due to their inherent size limitations. Herein, Atomic Force Microscopy (AFM) nanoindentation technique is utilized to study the mechanical properties of a photo responsive organic crystals at the nano- and macro-dimensions and to identify possible mechanisms of photomechanical fatigue as a result of repeated solid to solid photochemical transformations. We show the cooperative effects of an extended crystal structure at the macro-dimension results in a different response towards photo induced mechanical fatigue compared to the nano-dimensional solids.<br/>

Photomechanical fatigue of nano- and macro-dimensional organic crystalline solids using atomic force microscopy

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.