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Nanomechanics Quantum Size Effects, Contacts, and Triboelectricity

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Nanomechanics Quantum Size Effects, Contacts, and Triboelectricity ( nanomechanics-quantum-size-effects-contacts-and-triboelectri )

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List of papers This thesis is mainly based on the following papers, herein referred by their Roman numerals: I Martin Olsen, Per Gradin, Ulf Lindefelt, and Ha ̊kan Olin Nonharmonic oscilla- tions of nanosized cantilevers due to quantum-size effects. Physical Review B (2010), volume 81, issue 5, article id. 054304 II Martin Olsen, Magnus Hummelga ̊rd, and Ha ̊kan Olin Surface modifications by field induced diffusion. PLoS ONE (2012), volume 7, issue 1, artice id. e30106 IIIMartinOlsen,JonasO ̈rtegren,RenyunZhang,SalimReza,HenrikAndersson and Ha ̊kan Olin Schottky model for triboelectric temperature dependence. Scientific Reports (2018), volume 8, issue 1, article id. 5293 IVMartinOlsen,RenyunZhang,JonasO ̈rtegren,HenrikAndersson,YaYangand Ha ̊kan Olin Frequency and voltage response of a wind-driven fluttering triboelectric nanogenerator. Scientific Reports (2019), volume 9, issue 1, article id. 5543 Contributions Paper I: This was my second project as a Ph.D. student although this was the paper that was first completed and published. Ha ̊kan Olin had pre- viously written a paper about quantum-size effects in nanowires when stretching them, and he suggested that we may be able to produce this effect even when bend- ing a nanowire cantilever, affecting its resonance frequency. I carried out most of the calculations in this article, the exception being the cross sectional area calculation carried out by Per Gradin, finding that an approximately analytical solution existed. Ulf Lindefelt did interesting simulations for the energy levels of the cross section, which added to the understanding. I wrote the paper and made the figures. Contributions Paper II: This was my first project as a PhD student. Ha ̊kan Olin introduced me to the subject of surface modification when two nanosized tips came close together. I carried out the calculations and made most of the figures. The liter- ature suggested that the surface induced dipole moment of a surface adsorbed atom always pointed away from the surface indicating a threshold field for mound forma- tion by diffusion. Magnus Hummelga ̊rd did interesting simulations that supported the analytical calculations and he is responsible for two figures in this paper. I wrote the paper together with Ha ̊kan Olin. xiii

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