Cargando…

On the impact of capillarity for strength at the nanoscale

The interior of nanoscale crystals experiences stress that compensates for the capillary forces and that can be large, in the order of 1 GPa. Various studies have speculated on whether and how this surface-induced stress affects the stability and plasticity of small crystals. Yet, experiments have s...

Descripción completa

Detalles Bibliográficos
Autores principales: Mameka, Nadiia, Markmann, Jürgen, Weissmüller, Jörg
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5719409/
https://www.ncbi.nlm.nih.gov/pubmed/29215002
http://dx.doi.org/10.1038/s41467-017-01434-2
_version_ 1783284484275175424
author Mameka, Nadiia
Markmann, Jürgen
Weissmüller, Jörg
author_facet Mameka, Nadiia
Markmann, Jürgen
Weissmüller, Jörg
author_sort Mameka, Nadiia
collection PubMed
description The interior of nanoscale crystals experiences stress that compensates for the capillary forces and that can be large, in the order of 1 GPa. Various studies have speculated on whether and how this surface-induced stress affects the stability and plasticity of small crystals. Yet, experiments have so far failed to discriminate between the surface contribution and other, bulk-related size effects. To clarify the issue, here we study the variation of the flow stress of a nanomaterial while distinctly different variations of the two capillary parameters, surface tension, and surface stress, are imposed under control of an applied electric potential. Our theory qualifies the suggested impact of surface stress as not forceful and instead predicts a significant contribution of the surface energy, as measured by the surface tension. The predictions for the combined potential-dependence and size-dependence of the flow stress are quantitatively supported by the experiment. Previous suggestions, favoring the surface stress as the relevant capillary parameter, are not consistent with our experiment.
format Online
Article
Text
id pubmed-5719409
institution National Center for Biotechnology Information
language English
publishDate 2017
publisher Nature Publishing Group UK
record_format MEDLINE/PubMed
spelling pubmed-57194092017-12-08 On the impact of capillarity for strength at the nanoscale Mameka, Nadiia Markmann, Jürgen Weissmüller, Jörg Nat Commun Article The interior of nanoscale crystals experiences stress that compensates for the capillary forces and that can be large, in the order of 1 GPa. Various studies have speculated on whether and how this surface-induced stress affects the stability and plasticity of small crystals. Yet, experiments have so far failed to discriminate between the surface contribution and other, bulk-related size effects. To clarify the issue, here we study the variation of the flow stress of a nanomaterial while distinctly different variations of the two capillary parameters, surface tension, and surface stress, are imposed under control of an applied electric potential. Our theory qualifies the suggested impact of surface stress as not forceful and instead predicts a significant contribution of the surface energy, as measured by the surface tension. The predictions for the combined potential-dependence and size-dependence of the flow stress are quantitatively supported by the experiment. Previous suggestions, favoring the surface stress as the relevant capillary parameter, are not consistent with our experiment. Nature Publishing Group UK 2017-12-07 /pmc/articles/PMC5719409/ /pubmed/29215002 http://dx.doi.org/10.1038/s41467-017-01434-2 Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Mameka, Nadiia
Markmann, Jürgen
Weissmüller, Jörg
On the impact of capillarity for strength at the nanoscale
title On the impact of capillarity for strength at the nanoscale
title_full On the impact of capillarity for strength at the nanoscale
title_fullStr On the impact of capillarity for strength at the nanoscale
title_full_unstemmed On the impact of capillarity for strength at the nanoscale
title_short On the impact of capillarity for strength at the nanoscale
title_sort on the impact of capillarity for strength at the nanoscale
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5719409/
https://www.ncbi.nlm.nih.gov/pubmed/29215002
http://dx.doi.org/10.1038/s41467-017-01434-2
work_keys_str_mv AT mamekanadiia ontheimpactofcapillarityforstrengthatthenanoscale
AT markmannjurgen ontheimpactofcapillarityforstrengthatthenanoscale
AT weissmullerjorg ontheimpactofcapillarityforstrengthatthenanoscale