Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 46, Pages 13566-13570Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201505813
Keywords
amino acids; crystallography; density functional calculations; mechanical properties; Young's modulus
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Funding
- Deutsch-Israelische Projektkooperation (DIP) program
- Lise Meitner Minerva Center for Computational Chemistry
- Israel Science Foundation
- Gerhard Schmidt Center for Supramolecular Structures at Weizmann Institute
- US Office of Naval Research [N00014-14-1-0761]
- Weston Visiting Professorship Program
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Young's moduli of selected amino acid molecular crystals were studied both experimentally and computationally using nanoindentation and dispersion-corrected density functional theory. The Young modulus is found to be strongly facet-dependent, with some facets exhibiting exceptionally high values (as large as 44GPa). The magnitude of Young's modulus is strongly correlated with the relative orientation between the underlying hydrogen-bonding network and the measured facet. Furthermore, we show computationally that the Young modulus can be as large as 70-90GPa if facets perpendicular to the primary direction of the hydrogen-bonding network can be stabilized. This value is remarkably high for a molecular solid and suggests the design of hydrogen-bond networks as a route for rational design of ultra-stiff molecular solids.
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