Unusually Large Young's Moduli of Amino Acid Molecular Crystals

被引：99

作者：

Azuri, Ido ^{[1
]}

Meirzadeh, Elena ^{[1
]}

Ehre, David ^{[1
]}

Cohen, Sidney R. ^{[2
]}

Rappe, Andrew M. ^{[3
]}

Lahav, Meir ^{[1
]}

Lubomirsky, Igor ^{[1
]}

Kronik, Leeor ^{[1
]}

机构：

[1] Weizmann Inst Sci, Dept Mat & Interfaces, IL-76100 Rehovot, Israel

[2] Weizmann Inst Sci, Chem Res Support, IL-76100 Rehovot, Israel

[3] Univ Penn, Dept Chem, Makineni Theoret Labs, Philadelphia, PA 19104 USA

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2015年 / 54卷 / 46期

基金：

以色列科学基金会;

关键词：

amino acids; crystallography; density functional calculations; mechanical properties; Young's modulus; MECHANICAL-PROPERTIES; ELASTIC PROPERTIES; PHASE-TRANSITION; ALPHA-GLYCINE; BETA-GLYCINE; NANOINDENTATION; INDENTATION; PLASTICITY; PRESSURE; BEHAVIOR;

D O I：

10.1002/anie.201505813

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：13566 / 13570

页数：5

共 52 条

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