Browsing Fakultät für Physik (inkl. GAUSS) by Referee "Volkert, Cynthia Prof. Dr."
Now showing items 1-20 of 20
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Correlations between manganese valence and catalytic oxygen evolution of LixMn2O4
(2021-07-30)This doctoral thesis deals with the mechanistic insights in catalysing the oxygen evolution reaction (OER) in alkaline solution by using a tuneable LixMn2O4 spinel as a model catalyst, motivated by the challenging step to ... -
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 ... -
Energy dissipation and transport in polymeric switchable nanostructures via a new energy-conserving Monte-Carlo scheme
(2018-04-13)Polymers are materials that are widely used in industry. The advantages of polymers are their comparatively simple possibility of processing, e.g, injection moulding processes, 3D printers, and self-assembly. Polymers ... -
Hierarchical Mechanical Properties of Wood Cell Wall in Microscale and Nanoscale
(2021-09-21)As one of the remarkable hybrid materials in nature, wood chooses the smartest way to bear mechanical loads by using the least amount of base materials and creates outstanding functional mechanical properties comparable ... -
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 Deinterkalation von Lithiummanganoxid mittels Atomsondentomographie
(2017-12-05)The interest in understanding the underlying mechanisms of energy conversion in lithium ion batteries leads to increasing activities in three dimensional characterizing of battery materials with atom probe tomography with ... -
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 ... -
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 ... -
Mikrostruktur von Lithium-Mangan-Oxid
(2017-04-20)Local ion-transport processes in active materials of lithium-ion batteries like lithium manganese oxide are essential influenced by the microstructure but is not yet well characterised. Atom probe tomography, a method ... -
Nanotribologische Untersuchungen an Dünnschicht-Manganaten: Phononische Beiträge zur Reibung auf der Nanometerskala
(2018-01-31)Even though friction is often described by straight-forward empirical laws, its fundamental cause is by no means simple. Many of the fundamental excitations at the nanoscale contact are strongly coupled making it challenging ... -
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 ... -
Reibung kristalliner, amorpher und stark korrelierter Systeme unter aktiver Kontrolle
(2018-08-09)Mechanical and kinetic energy is transferred into heat if to two bodies slide on each other. This energy dissipative process is usually called friction. This thesis contributes to the understanding of friction. This is ... -
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 ... -
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 ...