Nanoscale stiffness of individual dendritic molecules and their aggregates

Tsukruk, Vladimir V.; Shulha, Hennady; Zhai, Xiaowen
February 2003
Applied Physics Letters;2/10/2003, Vol. 82 Issue 6, p907
Academic Journal
We demonstrate that carefully designed micromapping of the surface stiffness with nanoscale resolution could reveal quantitative data on the elastic properties of compliant, dendritic organic molecules with nanoparticulate dimensions below 3 nm. Much higher elastic modulus was observed for individual, fourth generation dendritic molecules due to their more shape persistent conformation. Large, reversible, elastic deformation is a distinct characteristic of the nanomechanical response observed for individual dendritic molecules. Such a "rubbery" response could be an indication of spatial constraints imposed on vitrification of dendritic molecules tethered to the functionalized interface. Surprisingly, an increased stiffness was also found for the third generation dendritic molecules within long aggregates.


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