From mesoscale to nanoscale mechanics in single-wall carbon nanotubes

Series: 
CCMMP Seminars
Speaker: 
Prof David Dunstan
Host: 
CCMMP
Date: 
October 17th, 2017 at 14:00
Room: 
GO Jones Room 610
Abstract: 

The radial collapse of single-wall carbon nanotubes under high pressure is a probe of the mechanical properties of graphene.  It turns out to distinguish their mesoscale and their nanoscale mechanics. The evolution with pressure of the Raman spectra for nine tube chiralities is investigated. In this part, I will also be discussing the general problem of the efficient and objective fitting of spectra.  Both experiment and  theoretical modelling reveals a previously unsuspected deviation from continuum mechanics.  Deviations from the continuum mechanics predictions start to be of significance for diameters smaller than 1 nm. The question is whether this is an effect of small size. In fact it turns out to be, rather, an effect of the discretization of the elastic compliances around the circumference of the tubes.