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The landscape of mechanical properties of molecular crystals

Abstract

An analysis of compiled literature nanoindentation hardness (Hc) and elastic modulus (E) values of molecular crystals revealed a wide range of mechanical properties of molecular crystals (0.001 – 1.80 GPa for Hc and 0.27 – 46.8 GPa for E). A global approximately linear relationship between E and Hc, was observed and possible reasons for deviation from the line were discussed. A classification scheme for molecular crystals based on the E and Hc is proposed. In addition, results suggest that the effectiveness of crystal engineering strategies in modifying both E and Hc follows the order of cocrystal/salt > polymorph > anisotropy. A clear understanding of the E and Hc landscape lays a foundation for effectively optimizing mechanical properties of molecular crystals through crystal engineering.

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Supplementary files

Article information


Submitted
27 Nov 2019
Accepted
27 Dec 2019
First published
01 Jan 2020

CrystEngComm, 2020, Accepted Manuscript
Article type
Communication

The landscape of mechanical properties of molecular crystals

C. Wang and C. C. Sun, CrystEngComm, 2020, Accepted Manuscript , DOI: 10.1039/C9CE01874C

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