Dokumente Fakultät für Physik (inkl. GAUSS) nach Gutachter "Volkert, Cynthia A. Prof. Dr."
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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 ... -
Dimensionseffekte in Halbleiternanodrähten
(2008-09-10)Nanomaterials show new physical properties, which are determined by their size and morphology. These new properties can be ascribed to the higher surface to volume ratio, to quantum size ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
In-situ Zugversuche an einkristallinen Gold-Nanodrähten im TEM
(2012-11-29)The investigation of size dependent mechanical properties of different materials was of great interest for physicists over the past decades. Whereas the deformation of bulk materials is nearly completely understood and 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 ... -
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 ... -
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 ... -
Magnetotellurics and Geomagnetic Depth Sounding in Queensland, South Eastern Australia -Evidence for the Tasman Line?
(2011-11-09)The Tasman Line in eastern Australia is commonly defined as the locus of Rodinia- Gondwana breakup. It is a much discussed concept in the geology and tectonics of eastern Australia. However, ... -
Mechanische Eigenschaften kristallin-amorpher Schichtpakete
(2013-01-11)Micromechanical characterization by Berkovich nanoindentation and uniaxial microcompression tests has been performed on multilayered films consisting of three different material combinations - Ti/ZrO2, Cu/PdSi und Cu/PC – ... -
Mechanische Eigenschaften von Lithiumionen Batterieelektrodenmaterialien bei verschiedenen Ladezuständen
(2015-08-14)Due to significant volume changes of lithium ion battery electrode materials under operation, it is essential to understand the mechanical behavior of these materials. On the one hand there still are open questions about ... -
Mechanismen und Größeneffekte von Ermüdungsschädigungen in dünnen Kupfer filmen bei sehr hohen Zyklenzahlen
(2013-05-17)Thin metal films show completely different fatigue behavior than bulk metals. The films have longer fatigue lives and instead of extrusions and complex dislocation structures, they form interface cracks and isolated ... -
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 ... -
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 ... -
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 ...