Browsing Institutt for materialteknologi by Issue Date
Now showing items 661-680 of 2540
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Development of Hydrophobic Surfaces for Anti-Icing Applications
(Master thesis, 2016)Icing is a problem for several industries, and current methods for removal of ice have several difficulties as they are time consuming, energy intensive and may be environmentally harmful. A better solution to the icing ... -
Coupling and competition between ferroelectricity, magnetism, strain, and oxygen vacancies in AMnO3 perovskites
(Journal article; Peer reviewed, 2016)We use first-principles calculations based on density functional theory to investigate the interplay between oxygen vacancies, A-site cation size/tolerance factor, epitaxial strain, ferroelectricity, and magnetism in the ... -
Electrochemical Reactivity and Wetting Properties of Anodes Made from Anisotropic and Isotropic Cokes
(Journal article, 2016)High quality anodes require stable raw materials. As the quality of the coke available for production of anodes is changing, future production will rely on cokes that are more isotropic with higher impurity levels than ... -
Crystal structure, thermal expansion and electrical conductivity of LaCoxNiyMozO3
(Journal article; Peer reviewed, 2016)The effect of Mo-substitution was investigated for the LaCoxNiyMozO3 system, obtaining single-phase perovskite for Mo-substitutions up to 20 at%. The crystal structure of the perovskite changed from rhombohedral, orthorhombic ... -
The Influence of Polarization on the Wetting of Anodes in the Hall-Héroult Process
(Master thesis, 2016)Improvements in the Hall Héroult process for aluminium electrolysis has lead to a reduction in energy consumption from 20-25 kWh/kg Al 70 years ago, down to around 13-14 kWh/kg Al on average today. In order to further ... -
Effect of A-Site Cation Ordering onChemical Stability, Oxygen Stoichiometry andElectrical Conductivity in Layered LaBaCo2O5+dDouble Perovskite
(Journal article; Peer reviewed, 2016)The effect of the A-site cation ordering on the chemical stability, oxygen stoichiometry and electrical conductivity in layered LaBaCo2O5+δ double perovskite was studied as a function of temperature and partial pressure ... -
Phases and Zones in the Silicon Process
(Master thesis, 2016)Different zones and materials formed during the production of silicon in a silicon furnace has been examined in this thesis. Samples from two industrial scale silicon furnaces have been have been studied. The excavations ... -
Texture and Microstructure Evolution during Extrusion of AlMgSi-Alloys
(Master thesis, 2016)The main objective of this thesis is to contribute to a better understanding of the microstructure and texture evolution during extrusion of AlMgSi alloys. The textures and microstructures in AA6082 were analysed after ... -
Microfluidic and high temperaturetechniques for aqueous electrochemistry
(Doctoral thesis at NTNU;2016:196, Doctoral thesis, 2016)Liquid organic fuels are highly desired energy carriers as they have a high energy density, simple production, and can benefit directly from existing infrastructure. However, the electrochemical conversion efficiency is ... -
Origin of ferroelectric polarization in tetragonal tungsten-bronze-type oxides
(Journal article; Peer reviewed, 2016)The origin of ferroelectric polarization in tetragonal tungsten-bronze- (TTB-) type oxide strontium barium niobate (SBN) is investigated using first-principles density functional calculations. We study in particular the ... -
Characterisation of Feed and Produced Material in Screw Extrusion of Titanium
(Master thesis, 2016)A novel method of extrusion of materials with high viscosity is being developed at NTNU, the method is based on screw extrusion, which is more known in the plastic industry. The process, at the end of the development cycle ... -
Utmatting av AA6005 - Effekten av forskjellige tilstander
(Master thesis, 2016)The aim of this thesis is to investigate the effect of ageing, both natural and artificial, at room temperature on the fatigue properties of AA6005. Artificial ageing was done to reach a temper state of equal hardness on ... -
Novel synthesis method of BaTiO3-nanoparticles - Synthesis of BaTiO3-nanoparticles by spray-pyrolysis of TiO2-nanoparticles dispersed in Ba(NO3)2-solution
(Master thesis, 2016)Ferroelectric materials are widely used in different technological applications. Lead zirconate titanate (PZT) materials are currently the most used, due to their excellent piezoelectric properties and relatively high ... -
N-type Czochralski silicon ingots - Oxygen-related defects in the last solid fraction
(Master thesis, 2016)The focus of this master's thesis has been the formation of oxygen-related defects in the last 10 cm before the tail in Czochralski silicon ingots for solar cell applications. For nine industrial standard ingots from ... -
Bipolar Plates for PEM Systems
(Doctoral thesis at NTNU;2016:247, Doctoral thesis, 2016)Summary of thesis: The Bipolar Plate (BPP) is an important component in both Proton Exchange Membrane Fuel Cells (PEMFCs) and Proton Exchange Membrane Water Electrolyzers (PEMWEs). Bipolar plate material and processing ... -
X-ray Microprobe Investigation of Iron During a Simulated Silicon Feedstock Extraction Process
(Peer reviewed; Journal article, 2016)Elemental silicon is extracted through carbothermic reduction from silicon-bearing raw feedstock materials such as quartz and quartzites. We investigate the micron-scale distribution and valence state of iron, a deleterious ... -
Waterborne chitosan-epoxysilane hybrid pretreatments for corrosion protection of zinc
(Journal article; Peer reviewed, 2016)Biopolymer-based systems are extensively studied as green alternatives for traditional polymer coatings, e.g., in corrosion protection. Chitosan–epoxysilane hybrid films are presented in this work as a chitosan-based ... -
Edge/basal/defect ratios in graphite and their influence on the thermal stability of lithium ion batteries
(Journal article, 2016)Raw graphite can be processed industrially in large quanta but for the graphite to be useful in lithium ion batteries (LIB's) certain parameters needs to be optimized. Some key parameters are graphite morphology, active ... -
Structural Dynamics Study of Hydration Shells on n-Ge(100) in Aqueous Solution with Electrochemical Control
(Chapter, 2016)Structural changes of the hydration shell of surfaces in aqueous solution are studied using attenuated total reflection infrared spectroscopy, under different electrode potentials and consequently different states of the ... -
Development of an asymmetrical oxygen permeable membrane based on hexagonal manganites
(Master thesis, 2016)Pure oxygen is a commodity chemical needed in many industries. Separation of oxygen from air is usually performed by the expensive and highly energy-demanding process of cryogenic distillation. A promising and more ...