Browsing Fakultät für Physik (inkl. GAUSS) by Referee "Volkert, Cynthia A. Prof. Dr."
Now showing items 1-20 of 26
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Ionenstrahlanalytik zum Nachweis von Wasserstoff und Lithium mittels MeV Ionen
(2024-06-24)Light elements are not amenable to most analytical methods. In this work, ion beam analysis was used to detect hydrogen and lithium in materials. For the detection of hydrogen, coincident scattering and the resonant ... -
Elektronenmikroskopische Untersuchung des Einflusses elektrischer Felder auf das Sinterverhalten von Oxidkeramiken
(2023-11-09)Despite the wide application potential of flash sintering for processing ceramic materials, the physical origins of the effect remain unclear. Therefore, the primary objective of this work is to gain a deeper understanding ... -
Structure Investigations of LiMn2O4 as Oxygen Evolution Reaction Catalyst
(2023-09-15)The catalytic activity of a material is determined by the electronic structure and atomic arrangements at its surface. In particular, eg occupancy of octahedral cations has been found to be a successful descriptor of the ... -
Interlayer effect on the hydrogen uptake in Vanadium films: Stress development, surface topography and optical behavior changes
(2023-07-13)The purpose of this study is to investigate hydrogen absorption-related properties changes of nanocrystalline thin films by varying the elastic constraints condition. The elastic constraint condition is varied by using ... -
In-situ lithiation of lithium manganese oxide in a transmission electron microscope
(2023-03-15)This thesis presents in-situ studies of the lithiation of lithium manganese oxide in a transmission electron microscope. It focuses on the phase transitions from spinel to tetragonal phase and the role of defects on ... -
Verformungsverhalten nanoskaliger Dünnschichten bei AFM-Indentierung
(2023-02-20)Nanoscaled materials differ in their mechanical properties from their bulk counterparts. Reasons therefore are e. g. the different ratio of surface and volume, which leads to different deformation mechanisms. In the case ... -
Nanoscale Friction Measurements on Manganite Thin Films: Which Material Properties are Important?
(2023-01-05)Although the phenomenon of friction has been known to mankind for millennia, the underlying mechanisms that ultimately lead to the conversion of kinetic/mechanical energy into heat remain unclear. Based on Bowden and Tabor's ... -
Local excitation of confined molecule-surface hybrid systems
(2022-11-28)Molecule-surface hybrid systems promise solutions for a variety of technological challenges – including the development of efficient catalysts as well as of molecular electronic devices. In this work, different molecule ... -
Stochastic field theory of viscoelastic solids: a quantitative study of phononic friction
(2022-07-27)Identifying the relevant dynamics of solids that give rise to friction is an active field of study. It includes electronic and phononic degrees of freedom, but the latter seems to be of particular significance. For instance, ... -
In-situ Environmental Transmission Electron Microscopy Investigation of Perovskite Oxide Thin Films During Electrochemical Oxygen Evolution Reaction.
(2022-07-21)Despite many theoretical and experimental efforts to find active catalysts in oxygen evolution reaction (OER), the mechanism for high activity and long-term OER stability remains elusive. Catalyst-electrolyte interface ... -
Mikrostrukturänderungen durch hohe elektrische Stromdichten in Eisen-Kohlenstoff Dünnschichten
(2021-08-11)Processing of materials with high electric and magnetic fields is a growing topic in material science. Yet, the interactions of fields and currents are complex and not fully understood. Therefore, the impact of high direct ... -
Probing Light-Matter Interactions in Plasmonic Nanotips
(2020-09-03)The exploration of light-matter interaction has inspired some of the most essential theories and applications in fundamental science and technology. Cutting-edge research, such as ultrafast time-resolved and super-resolution ... -
Beziehung zwischen Struktur und Bruchzähigkeit von Holzzellwänden
(2020-08-12)Wood has very good specific mechanical properties. This is mainly caused by its hierarchical structure, since wood is a composite of polymers that have much worse specific mechanical properties than wood. The relation ... -
Hydrogen diffusion and hydride formation in grain boundary rich magnesium
(2019-05-06)In the last decade Magnesium (Mg) has attracted much interest as a storage material for hydrogen in a future hydrogen energy based economy. The reasons are its high reversible hydrogen capacity of up to 7,6 wt% and its ... -
Kinetics of Directed Self-Assembly of Block Copolymers via Continuum Models
(2019-02-22)The development of nanostructured materials relies on the advancement of our understanding of their properties and behavior at the molecular level. To leverage the potential of block-copolymers (BCP) as a cutting-edge ... -
Thermalization in one-dimensional quantum-many-body systems
(2017-01-16)We consider the thermalization of the momentum distribution in two one-dimensional models. The first one is the integrable Hubbard model with an additional integrability breaking term in the Hamiltonian, which is a ... -
Untersuchung der Versetzungsnukleation in Gold-Nanodrähten durch in-situ Elektronenmikroskopie
(2016-05-25)The mechanical properties of a material play a decisive role for possible applications. Nanoscale metals have long been known to show different mechanical properties than their bulk counterpart. In bulk metals the deformation ... -
Einfluss von gelöstem Wasserstoff auf die Versetzungsbildung bei plastischer Verformung von Metallen
(2016-03-11)Dissolved hydrogen in metals leads in many cases to a reduction in the quality of mechanical properties. There are many effects that can be attributed to the solution of hydrogen. These are collectively referred to as ... -
In-situ Bruchversuche an amorph/kristallinen Multilagen im Transmissionselektronenmikroskop
(2015-11-26)In this thesis, in-situ fracture tests on amorphous/crystalline multilayers with layer thicknesses of less than 100 nm have been performed inside a transmission electron microscope. In this experiments, the layer thickness ... -
Elektrische Quadrupolwechselwirkung in defektreichen und deformierten MAX-Phasen
(2015-10-06)In this work, it is shown how hyperfine interaction methods can be used to in-situ detect defects and deformations even in crystallographically complex materials such as the MAX-Phases, a class of ternary carbides and ...