Zobrazeno 1 - 10
of 269
pro vyhledávání: '"Dunstan, D. J."'
Carbon nanotubes tend to collapse when their diameters exceed a certain threshold, or when a sufficiently large external pressure is applied on their walls. Their radial stability of tubes has been studied in each of these cases, however a general th
Externí odkaz:
http://arxiv.org/abs/2101.12418
Euler solved the problem of the collapse of tall thin columns under unexpectedly small loads in 1744. The analogous problem of the collapse of circular elastic rings or tubes under external pressure was mathematically intractable and only fully solve
Externí odkaz:
http://arxiv.org/abs/2011.14120
Density functional theory has been employed to study graphene on the (111), (100) and (110) surfaces of silicon (Si) substrates. There are several interesting findings. First, carbon atoms in graphene form covalent bonds with Si atoms, when placed cl
Externí odkaz:
http://arxiv.org/abs/2010.02551
Autor:
Sun, Y. W., Liu, W., Hernandez, I., Gonzalez, J., Rodriguez, F., Dunstan, D. J., Humphreys, C. J.
Publikováno v:
Phys. Rev. Lett. 123, 135501 (2019)
Previous Raman measurements on supported graphene under high pressure reported a very different shift rate of in-plane phonon frequency of graphene (16 cm$^{-1}$GPa$^{-1}$) from graphite (4.7 cm$^{-1}$GPa$^{-1}$), implying very different in-plane anh
Externí odkaz:
http://arxiv.org/abs/1902.02651
Autor:
Qadir, A., Sun, Y. W., Liu, W., Oppenheimer, P. Goldberg, Xu, Y., Humphreys, C. J., Dunstan, D. J.
Publikováno v:
Phys. Rev. B 99, 045402 (2019)
The lubricating ability of graphite largely depends on the environmental humidity, essentially the amount of water in between its layers. In general, intercalated molecules in layered materials modify their extraordinary properties by interacting wit
Externí odkaz:
http://arxiv.org/abs/1809.09515
The Hall-Petch effect has been described for the past sixty years as a dependence of the strength of polycrystalline metals on the inverse square-root of grain size d. The value of the coefficient of the dependence has been the subject of discussion
Externí odkaz:
http://arxiv.org/abs/1808.08523
Layered materials have huge potential in various applications due to their extraordinary properties. To determine the interlayer interaction (or equivalently the layer spacing under different perturbations) is of critical importance. In this letter,
Externí odkaz:
http://arxiv.org/abs/1704.04202
Autor:
Yokoyama, K., Lord, J. S., Murahari, P., Wang, K., Dunstan, D. J., Waller, S. P., McPhail, D. J., Hillier, A. D., Henson, J., Harper, M. R., Heathcote, P., Drew, A. J.
Publikováno v:
Review of Scientific Instruments 87, 125111 (2016)
A high power pulsed laser system has been installed on the high magnetic field muon spectrometer (HiFi) at the ISIS pulsed neutron and muon source, situated at the STFC Rutherford Appleton Laboratory in the UK. The upgrade enables one to perform ligh
Externí odkaz:
http://arxiv.org/abs/1607.06145
Publikováno v:
Phys. Rev. B 92, 094108 (2015)
Stacking graphene sheets forms graphite. Two in-plane vibrational modes of graphite, E1u and E2g(2), are derived from graphene E2g mode, the shifts of which under compression are all considered as results of in-plane bond shortening. Values of Grune
Externí odkaz:
http://arxiv.org/abs/1502.04323
Autor:
Sun, Y. W., Hernandez, I., Gonzalez, J., Scott, K., Donovan, K. J., Sapelkin, A., Rodriguez, F., Dunstan, D. J.
The study of the G-mode pressure coefficients of carbon nanotubes, reflecting the stiff sp2 bond pressure dependence, is essential to the understanding of their extraordinary mechanical properties as well as fundamental mechanics. However, it is hind
Externí odkaz:
http://arxiv.org/abs/1411.5832