The mechanism of bending in a plastically flexible crystal.

Autor: Bhandary S; Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal, Madhya Pradesh 462066, India. dchopra@iiserb.ac.in., Thompson AJ; School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia QLD 4072, Australia. j.clegg@uq.edu.au., McMurtrie JC; School of Chemistry and Physics, Queensland University of Technology, 2 George Street, Brisbane, QLD 4000, Australia and Centre for Materials Science, Queensland University of Technology, 2 George Street, Brisbane, QLD 4000, Australia., Clegg JK; School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia QLD 4072, Australia. j.clegg@uq.edu.au., Ghosh P; Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal, Madhya Pradesh 462066, India. dchopra@iiserb.ac.in., Mangalampalli SRNK; Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, 603203, India., Takamizawa S; Department of Materials System Science, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, Kanagawa 236-0027, Japan., Chopra D; Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal, Madhya Pradesh 462066, India. dchopra@iiserb.ac.in.
Jazyk: angličtina
Zdroj: Chemical communications (Cambridge, England) [Chem Commun (Camb)] 2020 Oct 22; Vol. 56 (84), pp. 12841-12844.
DOI: 10.1039/d0cc05904h
Abstrakt: Mechanically adaptable molecular crystals have potential applications in flexible smart materials and devices. Here, we report the mechanism of plastic deformation in single crystals of a small organic molecule (N-(4-ethynylphenyl)-3-fluoro-4-(trifluoromethyl)benzamide) that can be repeatedly irreversibly bent and returned to its original shape without concomitant delamination or loss of integrity. Along with the quantification of the crystals' local and bulk mechanical properties (hardness, indentation modulus and Young's modulus), micro-focus synchrotron X-ray diffraction mapping show that upon deformation, molecular layers lined with trifluoromethyl groups cooperatively slip past one another resulting in their impressive plastic malleability.
Databáze: MEDLINE