Issue 7, 2020

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 (0.001–1.80 GPa for Hc and 0.27–46.8 GPa for E). A global approximately linear relationship between E and Hc is observed and possible reasons for deviation from the line are discussed. A classification scheme for molecular crystals based on 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 cocrystallization/salt formation > polymorph formation > anisotropy. A clear understanding of the E and Hc landscape lays a foundation for effective optimization of the mechanical properties of molecular crystals through crystal engineering.

Graphical abstract: The landscape of mechanical properties of molecular crystals

Supplementary files

Article information

Article type
Communication
Submitted
27 نومبر 2019
Accepted
27 دسمبر 2019
First published
01 جنؤری 2020

CrystEngComm, 2020,22, 1149-1153

The landscape of mechanical properties of molecular crystals

C. Wang and C. C. Sun, CrystEngComm, 2020, 22, 1149 DOI: 10.1039/C9CE01874C

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