Browsing Institutt for materialteknologi by Issue Date
Now showing items 841-860 of 2540
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Size and shape effects on the thermodynamic properties of nanoscale volumes of water
(Journal article; Peer reviewed, 2017)Small systems are known to deviate from the classical thermodynamic description, among other things due to their large surface area to volume ratio compared to corresponding big systems. As a consequence, extensive ... -
In situ synthesis of titania and titanium based organicinorganic nanomaterials
(Doctoral theses at NTNU;2017:230, Doctoral thesis, 2017)Inorganic and organic materials often exhibit opposite trends in properties (e.g. mechanical properties, thermal stability, hydrophobicity, optical properties) and the idea of combining these materials into new materials ... -
Electrode potential dependent desolvation and resolvation of germanium(100) in contact with aqueous perchlorate electrolytes
(Journal article; Peer reviewed, 2017)The electrode potential dependence of the hydration layer on an n-Ge(100) surface was studied by a combination of in situ and operando electrochemical attenuated total reflection infrared (ATR-IR) spectroscopy and real ... -
Effects of 2 ppm Beryllium on the Oxidation of a 5XXX Aluminum Alloy at Temperatures Between 500 and 750 °C
(Chapter, 2017)The oxidation of molten aluminum has been thoroughly studied, and it is established empirically that beryllium has an inhibiting effect on the oxidation behavior. The aim of this work was to increase the fundamental ... -
Mass Transfer of Al and Ca Between Silicon and Synthetic SiO2-CaO-Al2O3 Slags
(Chapter, 2017)The mass transfer of Al and Ca between silicon and synthetic SiO2 −CaO − Al2O3 slags of varying composition has been investigated, using different experimental set-ups. Samples were kept at 1600◦C, varying the holding times ... -
Effect of order and disorder on degradation processes of copper phthalocyanine nanolayers
(Journal article; Peer reviewed, 2017)The impact was examined of surface ordering of 50 nm-thick copper phthalocyanine (CuPc) layers on the layer's susceptibility to ambience-induced degradation processes. The surface morphology of CuPc layers obtained by ... -
Influence of Annealing of Al-5Ti-1B Master Alloy on Hot Tearing of Cast Al-7Si-3Cu Alloy
(Journal article; Peer reviewed, 2017)Hot tearing is a common and severe defect encountered in aluminium alloys castings. It is affected by alloy composition as well as processing conditions and variables. In Al–7Si-3Cu presence of copper increases mechanical ... -
Investigation of Spent Refractory Lining in an Anode Baking Furnace
(Journal article; Peer reviewed, 2017)The refractory lining in anode baking furnaces is exposed to harsh chemical environment and thermal cycling. Spent refractory lining from an anode baking furnace after 4000 days in operation was investigated. Variation in ... -
Local Structure of Disordered Bi0.5K0.5TiO3 Investigated by Pair Distribution Function Analysis and First-Principles Calculations
(Journal article; Peer reviewed, 2017)We investigate A-site cation ordering in the ferroelectric perovskite Bi0.5K0.5TiO3 (BKT) by density functional theory (DFT) calculations and synchrotron X-ray total scattering. Using BKT as a prototypical lead-free ... -
Modeling strain-path changes in aluminum and steel
(Journal article, 2017)The present paper evaluates two phenomenological plasticity models which account for the influence of strain-path change (SPC) on the stress-strain behavior. The HAH model (Barlat et al., 2014) is modified to capture SPC ... -
Microfluidic flow cells for the analysis of electrocatalytic reactions
(Doctoral theses at NTNU;2017:331, Doctoral thesis, 2017)English summary Microfluidic flow cells for the analysis of electrocatalytic reactions The electro-oxidation of small organic molecules such as methanol could play an important role in the transition from fossil fuels ... -
The Influence of Catalyst Layer Thickness on the Performance and Degradation of PEM Fuel Cell Cathodes with Constant Catalyst Loading
(Journal article, 2017)Three catalytic layers containing Pt nanoparticles supported on high surface area carbon of different Pt loading but with the same total amount of platinum and therefore of different thickness were employed as cathode ... -
Materials for Proton Exchange Membrane water electrolyzer bipolar plates
(Journal article; Peer reviewed, 2017)Titanium based BiPolar Plates (BPPs) are commonly used in Proton Exchange Membrane Water Electrolyzers (PEMWEs) today as they can withstand the harsh operating conditions experienced inside an operating PEM water electrolyzer. ... -
Numerical modelling and photo-electrochemical characterization of dye sensitized solar cells
(Master thesis, 2017)Current-potential characteristics were recorded, and intensity modulated photocurrent spectroscopy (IMPS), intensity modulated photovoltage spectroscopy (IMVS), and electrochemical impedance spectroscopy (EIS) was performed ... -
Toughening of Y-doped BaZrO3 proton conducting electrolytes by hydration
(Journal article; Peer reviewed, 2017)In BaZr1−xYxO3−x/2 (BZY), the state-of-the-art oxide proton conductors, the proton conductivity is facilitated by hydration of oxygen vacancies. Hydration induces lattice expansion, which may induce stress and thereby ... -
High Power Batteries probed by Neutron Scattering
(Doctoral theses at NTNU;2017:195, Doctoral thesis, 2017)Rechargeable batteries are currently powering a large range of applications, including power and emergency storage systems, HEVs and EVs, and various portable electronic devices. Increasing the use of batteries as a ... -
Distribution of Phosphorus between FeSi/Si and CaO-SiO2 Slags at 1600o C
(Master thesis, 2017)The aim of this thesis was to determine data for the phosphorus(P) distribution coefficients between ferrosilicon(FeSi) or silicon(Si) and calcia-silica(CaO SiO2) slags. The work was carried out due to inconsistencies ... -
Topological defects in hexagonal manganites - Inner structure and emergent electrostatics
(Journal article; Peer reviewed, 2017)Diverse topological defects arise in hexagonal manganites, such as ferroelectric vortices, as well as neutral and charged domain walls. The topological defects are intriguing because their low symmetry enables unusual ... -
Chemical Stability of Thermal Insulating Materials in Sodium Vapour Environment
(Journal article; Peer reviewed, 2017)The most typical thermal insulating materials used in the cathode lining in aluminium electrolysis cells are Moler, calcium silicate, or vermiculite. The thermal insulation is important for the overall thermal and dimensional ... -
Strengthening and toughening mechanisms of an ultrafine grained Mg-Gd-Y-Zr alloy processed by cyclic extrusion and compression
(Journal article; Peer reviewed, 2017)Cyclic extrusion and compression (CEC) was implemented to process the Mg-Gd-Y-Zr alloy. Microstructure characters, including the matrix grain, precipitates and texture evolution, were tried to correlate with the mechanical ...