Blar i Fakultet for naturvitenskap (NV) på emneord "Industriell kjemi og bioteknologi, Materialkjemi og energiteknologi"
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Alumina Dissolution in Cryolite Melts - Formation and Behavior of Rafts
(Master thesis, 2018)Alumina is the raw-material used for aluminum production in the Hall-Héroult process. Though the process is used for several years, some phenomena is not fully investigated yet. One of those is the formation of floating ... -
Behaviour of the slip-cast crucible as a contamination source during silicon directional solidification
(Master thesis, 2016)In this work the behaviour of the slip-cast crucible as a contamination source of multicrystalline silicon during directional solidification (DS) was investigated. Transport parameters of iron were estimated in two types ... -
C-TiB2 Composite Inert Cathode Material by Spark Plasma Sintering
(Master thesis, 2018)TiB2 has been considered a potential inert, wettable cathode material for aluminum reduction cells for a long time. An important characteristic of TiB2 as a cathode material, is its excellent wetting properties towards ... -
Cathodic Protection of Steel-Aluminium Galvanic Couples for a New Generation of Lightweight Subsea Structures
(Master thesis, 2016)A new generation of lightweight subsea structures is planned for application in oil and gas production. Due to increasing weight of subsea installations, the use of aluminium as a structural material is of continuous ... -
Cation Nonstoichiometry of La2CoO4
(Master thesis, 2017)In this thesis, the cation nonstoichiometry and composition range of the La2CoO4 phase in the La-Co-O system were investigated and compared to earlier studies. There is a controversy over the cation nonstoichiometry of ... -
Current Distribution in Bipolar Cell Systems for the Chlor-alkali Industry
(Master thesis, 2018)The chlor-alkali industry is one of Europe s largest chemical industries and produces chlorine gas, hydrogen gas and sodium hydroxide. One of the main production methods is to use membrane cells that are assembled into a ... -
Development of a mixed-conducting layered oxide for asymmetric oxygen permeable membranes
(Master thesis, 2018)Over 100 million tons of pure oxygen gas are produced each year, making it one of the most used chemicals worldwide. As the conventional production process, cryogenic distillation, is very energy demanding, a new, cheaper ... -
EBSD Microstructure Characterization of 9% Nickel Steel during In Situ Heat Treatment
(Master thesis, 2015)The austenite content in 9% Ni steel was investigated with EBSD during and after in situ heating to different temperatures in the two phase region of the phase diagram, after first obtaining a coarse grained HAZ using weld ... -
Effect of Cathodic Polarization on the Susceptibility to Hydrogen Embrittlement in 5xxx, 6xxx and 7xxx Series Aluminium Alloys
(Master thesis, 2015)Aluminium is an interesting material for use in subsea applications due to the combination of low weight, good corrosion resistance and superior low temperature properties. So far, the use of aluminium alloys in offshore ... -
Effect of CuO doping in Bi0.5K0.5TiO3 - Development of Lead-Free Ferroelectric Materials
(Master thesis, 2015)Piezoelectric materials are currently used in a significant number of electronic applications, and lead-free piezoelectric materials have obtained much attention in the recent years. Bismuth potassium titanate (BKT) is a ... -
Effect of current density, electrolyte composition and temperature on hot alternating current anodising
(Master thesis, 2017)Hot alternating current (AC) anodising has been established as a fast and reliable pre-treatment process for continuous coil coating. Hydro Aluminium Rolled Products AS (HARP) uses this process as a surface treatment before ... -
Effect of Firing Temperature on the Kinetics of Oxygen Reduction in La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) Cathodes for Solid Oxide Fuel Cells
(Master thesis, 2015)In the present work, symmetric cells consisting of La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) cathodes and a Ce0.9Gd0.1O2-delta (CGO) electrolyte were fabricated. Both materials were spray-pyrolyzed by CerPoTech AS (Trondheim, ... -
Electrochemical characterization of YMnO3 in alkaline solution - Identifying the characteristic voltammogram and developing the experimental procedure
(Master thesis, 2016)Electrochemical intercalation of oxygen into oxide structures has been studied ever since it was first observed in 1990. A recent paper investigated using electrochemical intercalation of oxygen into vacancies in LaMnO3 ... -
Electrodeposition of zinc from acidic electrolyte
(Master thesis, 2017)Industrial zinc electrowinning is carried out in an aqueous solution of zinc sulfate in sulfuric acid. The anodes are made of a lead-silver alloy and the cathodes are made of a relatively pure aluminium alloy. A common ... -
Fabrication and Characterization of an Intermediate Band Material based on Ion Implantation and Pulsed Laser Melting of Ag in Fz-Si
(Master thesis, 2015)Intermediate band solar cells (IBSCs) are an innovative field of material engineering and their prospect of high efficiency may contribute to meet the demand for new energy alternatives. IBCSs are based on absorption of ... -
Ferroelectric Transitions in SrxBa(1-x)Nb2O6 - Effect of Thermal History on the Functional Properties
(Master thesis, 2015)Many functional materials used in todays electronic equipment have a high content lead. Due to the environmental challenges related to production and usage of such materials, extensive research has been preformed on lead-free ... -
Intergranular Corrosion of Extruded AlMgSi(Cu,Zn) Alloys
(Master thesis, 2016)In general, the 6xxx series alloys (AlMgSi) are considered to be resistant to intergranular corrosion (IGC) in marine environments. However, the addition of copper to increase peak hardness has proven to increase the IGC ... -
New Materials for Mg-ion batteries - Mn3O4 as cathode
(Master thesis, 2016)Due to drawbacks with the lithium ion battery technology, magnesium ion batteries are being researched as an alternative replacement system. An optimal combination of component materials has however not been discovered ... -
pH-dependence of chloride binding in ordinary Portland cement
(Master thesis, 2018)A new method for artificially leaching hydrated cement paste and studying how lowered pH in the pore solution affects chloride binding has been developed. Hydrated cement paste was exposed to a NaCl-solution before being ... -
Pitting Corrosion of Super Duplex Stainless Steel - Effect of Isothermal Heat Treament
(Master thesis, 2016)Super duplex stainless steels (SDSS), with a chromium content of 25 wt$\%$, contain a duplex structure which consists of ferrite and austenite, and have a pitting resistance equivalent number (PREN) equal or higher than ...