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Unusually Large Young’s Moduli of Amino Acid Molecular Crystals
Author(s) -
Azuri Ido,
Meirzadeh Elena,
Ehre David,
Cohen Sidney R.,
Rappe Andrew M.,
Lahav Meir,
Lubomirsky Igor,
Kronik Leeor
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201505813
Subject(s) - modulus , hydrogen bond , facet (psychology) , moduli , nanoindentation , perpendicular , materials science , crystallography , young's modulus , molecular dynamics , dispersion (optics) , density functional theory , chemical physics , chemistry , molecule , computational chemistry , molecular physics , composite material , geometry , physics , mathematics , optics , organic chemistry , psychology , social psychology , personality , quantum mechanics , big five personality traits
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 44 GPa). 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 70–90 GPa 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.