dc.contributor.advisor | Çıracı, Salim | |
dc.contributor.author | Cahangirov, Seymur | |
dc.date.accessioned | 2016-01-08T18:19:16Z | |
dc.date.available | 2016-01-08T18:19:16Z | |
dc.date.issued | 2012 | |
dc.identifier.uri | http://hdl.handle.net/11693/15486 | |
dc.description | Ankara : The Department of Materials Science and Nanotechnology, Bilkent University, 2012. | en_US |
dc.description | Thesis (Ph. D.) -- Bilkent University, 2012. | en_US |
dc.description | Includes bibliographical references leaves 80-89. | en_US |
dc.description.abstract | Frictional and vibrational properties of low-dimensional nanostructures have been
investigated using the state-of-the-art ab-initio calculations.
Stringent test of stability based on calculation of phonon dispersions have
been performed for various materials having important potential applications in
nanoscience and nanotechnology. Silicene, a counterpart of graphene composed
of silicon atoms, is one of such materials with its suitability to well established silicon
technology together with eccentric electronic structure due to its honeycomb
symmetry. Vibrational spectrum of silicene is found to be exempt from imaginary
frequencies upon the puckering of atoms in adjacent sublattices while preserving
the symmetry necessary for occurrence of massless Dirac Fermions. Analyses of
vibrational properties of silicene nanoribbons and carbon atomic chains revealed
new interesting physics like fourth acoustical mode and long-ranged interactions
due to Friedel oscillations.
Basic concepts of friction science like dissipation phenomena, adiabatic and
sudden processes together with several simple models of friction have been summarized.
A new method for calculation of corrugation potential between layered
lubricants under constant loading pressure is introduced. Transition from stickslip
to continuous sliding regime is quantified through definition of frictional figure
of merit for layered lubricants. Using this measure tungsten oxide is proposed as
an oxidation resistant material which can outperform molybdenum disulfide as a
superlubricant. It was found that, the corrugation strengths of graphene layers
sandwiched between Ni slabs decrease as the number of layers increase. | en_US |
dc.description.statementofresponsibility | Cahangirov, Seymur | en_US |
dc.format.extent | xvii, 89 leaves, illustrations | en_US |
dc.language.iso | English | en_US |
dc.rights | info:eu-repo/semantics/openAccess | en_US |
dc.subject | phonon | en_US |
dc.subject | stability | en_US |
dc.subject | silicene | en_US |
dc.subject | friction | en_US |
dc.subject | dissipation | en_US |
dc.subject | sudden process | en_US |
dc.subject.lcc | TA418.9.N35 C34 2012 | en_US |
dc.subject.lcsh | Nanostructured materials. | en_US |
dc.subject.lcsh | Friction. | en_US |
dc.subject.lcsh | Vibration. | en_US |
dc.title | Frictional and vibrational properties of nanostructures | en_US |
dc.type | Thesis | en_US |
dc.department | Graduate Program in Materials Science and Nanotechnology | en_US |
dc.publisher | Bilkent University | en_US |
dc.description.degree | Ph.D. | en_US |