Diversity of anisotropy effects in the breakup of metallic FCC nanowires into ordered nanodroplet chains. Issue 15 (25th March 2020)

• Record Type: Journal Article
• Authors: Gorshkov, Vyacheslav N.; Tereshchuk, Vladimir V.; Sareh, Pooya
• Is Part Of: CrystEngComm. Volume 22:Issue 15(2020)
• Page Start: 2601
• Page End: 2611
• Publication Date: 2020-03-25
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/c9ce01893j
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : The manifestation of anisotropy of surface energy density in the dynamics of 1D-nanostuctures, when annealed below melting temperature in different conditions, is studied on the basis of an analytical approach and Monte Carlo kinetic model. Abstract : We have analysed the expressed manifestation of the anisotropy of surface energy density in the dynamics of ultrathin nanowires, which break up into disjointed clusters when annealed below their melting temperature. The breakup process is studied for different temperatures and orientations of the nanowire axis relative to its internal crystal structure using the Monte Carlo kinetic method. We have also presented an approximate analytical model of the instability of nanowires. Generally, the interpretation of experimental results refers to the theoretical model developed by Nichols and Mullins, which is based on conceptions about the Rayleigh instability of liquid jets. In both cases, the theories – which do not take into account the anisotropy of surface energy density – predict the breakup of a nanowire/liquid jet with radius r into fragments with an average length Λ = 9 r . However, the observed value, Λ / r, often deviates from 9 either to lower values or to substantially greater ones (up to 24–30). Our results explain various observed features of the breakup and the significant variations in the values of its parameter Λ / r depending on experimental conditions. In particular, the ambiguous role of exchange by atoms of the surface of a nanowire with a surrounding layer of free atoms formed as a result of their rather intensive sublimation, which occurs in a number of cases, has been investigated. We have shown that this exchange can lead both to a decrease and to a significant increase in the parameter Λ / r . The obtained results could be potentially useful in applications such as the development of optical waveguides based on ordered nanoparticle chains.