Auxeticity enhancement due to size polydispersity in fcc crystals of hard-core repulsive Yukawa particles. Issue 43 (16th October 2017)

• Record Type: Journal Article
• Authors: Pigłowski, Paweł M.; Narojczyk, Jakub W.; Wojciechowski, Krzysztof W.; Tretiakov, Konstantin V.
• Is Part Of: Soft matter. Volume 13:Issue 43(2017)
• Page Start: 7916
• Page End: 7921
• Publication Date: 2017-10-16
• Subjects: Soft condensed matter -- Periodicals; 530.413
• DOI: 10.1039/c7sm01231d
• Languages: English
• ISSNs: 1744-683X

Abstract

Abstract : In this work we present results of Monte Carlo simulations of the elastic properties of Yukawa crystals with the polydispersity of size of particles. The results of our studies reveal an enhancement of negative Poisson's ratio (further referred to as auxeticity) due to size polydispersity in the system. We introduce a measure of auxeticity to estimate quantitatively an enhancement of auxetic properties which can be used to assess those changes in various systems. Abstract : The Poisson's ratio of the fcc hard-core repulsive Yukawa crystals with size polydispersity was determined by Monte Carlo simulations in the isothermal–isobaric ensemble. The effect of size polydispersity on the auxetic properties of Yukawa crystals has been studied. It has been found that an increase of particle size polydispersity causes a decrease of the Poisson's ratio in auxetic directions as well as appearance of a negative Poisson's ratio in formerly non-auxetic directions. A measure of auxeticity was introduced to estimate quantitatively an enhancement of auxetic properties in polydisperse Yukawa crystals. The proposed measure of auxeticity can be applied to appraise the auxeticity of any studied system.