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Home Search Collections Journals About Contact us My IOPscience Anomalous surface states modify the size-dependent mechanical properties and fracture of silica nanowires This content has been downloaded from IOPscience. Please scroll down to see the full text. 2014 Nanotechnology 25 435702 (/0957-4484/25/43/435702) View the table of contents for this issue, or go to the journal homepage for more Download details: IP Address: 48 This content was downloaded on 09/10/2014 at 18:58 Please note that terms and conditions apply. Nanotechnology Nanotechnology 25 (2014) 435702 (8pp) doi:10.1088/0957-4484/25/43/435702 Anomalous surface states modify the size- dependent mechanical properties and fracture of silica nanowires Chun Tang and Lilian P Dávila School of Engineering, University of California, Merced, CA 95343, USA E-mail: ldavila@ Received 12 April 2014, revised 7 August 2014 Accepted for publication 11 August 2014 Published 9 October 2014 Abstract Molecular dynamics simulations of amorphous silica nanowires under tension were analyzed for size and surface stress effects on mechanical properties and for structural modifications via bond angle distributions. Their fracture behavior was also investigated beyond the elastic limit. The Young’s moduli of silica nanowires were predicted to be about 75– 100 GPa, depending on the nanowire size. The ultimate strength was calculated to be ∼10 GPa, depending on the diameter, which is in excellent agreement with the experiments. The dependence of the Young’s modulus on nanowire diameter is explained in terms of surface compressive stress effects. The fracture behavior of nanowires was also found to be