Frictional and vibrational properties of nanostructures

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buir.advisorÇıracı, Salim
dc.contributor.authorCahangirov, Seymur
dc.date.accessioned2016-01-08T18:19:16Z
dc.date.available2016-01-08T18:19:16Z
dc.date.issued2012
dc.departmentGraduate Program in Materials Science and Nanotechnologyen_US
dc.descriptionAnkara : The Department of Materials Science and Nanotechnology, Bilkent University, 2012.en_US
dc.descriptionThesis (Ph. D.) -- Bilkent University, 2012.en_US
dc.descriptionIncludes bibliographical references leaves 80-89.en_US
dc.description.abstractFrictional 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.degreePh.D.en_US
dc.description.statementofresponsibilityCahangirov, Seymuren_US
dc.format.extentxvii, 89 leaves, illustrationsen_US
dc.identifier.urihttp://hdl.handle.net/11693/15486
dc.language.isoEnglishen_US
dc.publisherBilkent Universityen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectphononen_US
dc.subjectstabilityen_US
dc.subjectsiliceneen_US
dc.subjectfrictionen_US
dc.subjectdissipationen_US
dc.subjectsudden processen_US
dc.subject.lccTA418.9.N35 C34 2012en_US
dc.subject.lcshNanostructured materials.en_US
dc.subject.lcshFriction.en_US
dc.subject.lcshVibration.en_US
dc.titleFrictional and vibrational properties of nanostructuresen_US
dc.typeThesisen_US

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Graduate Program in Materials Science and Nanotechnology - Ph.D. / Sc.D.