Browsing Institutt for materialteknologi by Title
Now showing items 142-161 of 2498
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As-tapped Liquid Silicon Temperature Measurements in an Industrial Furnace
(Master thesis, 2019)Denne oppgaven tar for seg temperaturmålinger av smeltet silisium i rennen fra en industriell ovn. For at silisiumindustrien skal kunne oppfylle egne og myndigheters mål om forbedret energieffektivitet og lavere ... -
Aspects related to the thermal and mechanical stability of oxygen permeable membranes
(Doctoral theses at NTNU;2017:59, Doctoral thesis, 2017)Fossil fuels causes CO2 emission to the atmosphere after combustion, and to minimize CO2 emission carbon capture and sequestration (CCS) technologies are under development. CCS involves CO2 capture, compression, transport ... -
Assessment and Validation of the Engineering Performance of Central Venous Catheters (CVCs) and the Impact of Hemocompatible Thin Film Coatings
(2022:338;2022:338, Doctoral thesis, 2022)Biomaterials used in implanted medical devices must fulfil a stringent set of requirements, and both the bulk - and the surface properties of a device material must be considered when evaluating the engineering performance ... -
Assessment of advanced Taylor models, the Taylor factor and yield-surface exponent for FCC metals
(Journal article; Peer reviewed, 2019)High-resolution crystal plasticity-finite element method (CPFEM) simulations are performed to provide new reference values of the Taylor factor M and the isotropic yield surface exponent for high stacking fault energy ... -
Assessment of Established and New Separation Methods for Water-in-Oil Emulsions
(Bachelor thesis, 2020)Råolje er en kjemisk blanding av hydrokarboner, heteroatomer, metalliske forbindelser og mange komplekse organiske forbindelser. Sammensetningen av disse varierer avhengig av hvor og når hentet, samt flere ander faktorer. ... -
Assessment of feature engineering and long short-term memory for structure loss identification from process data in monocrystalline silicon growth by the Czochralski method
(Research report, 2019)Structure loss impairs the quality of monocrystalline ingots and represents a major productivity loss for crystal growers. If structure loss could be predicted in advance it could help reduce the lost production time or ... -
Assessment of the Recombination Resistance in Dye-Sensitized Solar Cells by Photoelectrochemical Techniques
(Master thesis, 2019)En fargestoffbasert solcelle utnytter et fargestoff med et passende båndgap til å eksitere elektroner inn i en halvleder med et høyt båndgap. Transporten av de positive ladningene foregår gjennom en elektrolytt. Denne måten ... -
Assessment of the Thermodynamic Stability of Thermal Insulating Materials in Aluminium Electrolysis Cells
(Journal article, 2016)The cathode bottom lining in aluminium electrolysis cells serves as a thermal insulating barrier and is important for the overall thermal and dimensional stability of the cell. The thermal insulation layer ... -
Asymmetric supported dense lanthanum tungstate membranes
(Journal article; Peer reviewed, 2014)In this work, a colloidal processing route for dense asymmetric La28-xW4+xO54+3x/2 membranes for hydrogen gas separation applications was established. Dip coating process conditions were optimized to obtain ≈20 m thick ... -
Atmosphere controlled conductivity and Maxwell-Wagner relaxation in Bi0.5K0.5TiO3 – BiFeO3 ceramics
(Journal article; Peer reviewed, 2014)Here, we report on a giant dielectric relaxation in (1 x)Bi0.5K0.5TiO3—xBiFeO3 ceramics below 300 C, which becomes more pronounced with increasing BiFeO3 content. The relaxation was shown to be of Maxwell-Wagner type ... -
Atom probe tomography investigations of aging of Al-Zn-Mg(-Cu) alloys during room temperature storage or by cyclic plasticity
(Doctoral theses at NTNU;2022:369, Doctoral thesis, 2022)Aluminum alloys containing zinc, magnesium, and copper attain strength by forming nanoparticles during thermal treatments. To generate particles by precipitation, first the alloy has to be heated to about 480°C to dissolve ... -
Atomic Layer Deposition of Titanium Oxide-Based Films for Semiconductor Applications—Effects of Precursor and Operating Conditions
(Journal article, 2023)Two widely used atomic layer deposition precursors, Tetrakis (dimethylamido) titanium (TDMA-Ti) and titanium tetrachloride (TiCl4), were investigated for use in the deposition of TiOx-based thin films as a passivating ... -
Atomic level bonding mechanism in steel/aluminum joints produced by cold pressure welding
(Journal article, 2019)Cold pressure welding of aluminum alloys and steels offers an attractive, cost-effective opportunity of joining the two most important structural materials. Aim of this work is to investigate the bonding mechanism between ... -
Atomic origins of dendrite formation on alkali and earthalkali metal surfaces
(Doctoral theses at NTNU;2021:313, Doctoral thesis, 2021)"The Li-ion rechargeable battery has been paramount in the on-going transition from a fossil- to a renewable energy-based society, but the state-of-the art Li-ion battery with a graphite anode is approaching its limit with ... -
Atomic Structure of Hardening Precipitates in Al-Mg-Si Alloys: Influence of Minor Additions of Cu and Zn
(Peer reviewed; Journal article, 2023)Shifting toward sustainability and low carbon emission necessitates recycling. Aluminum alloys can be recycled from postconsumer scrap with approximately 5% of the energy needed to produce the same amount of primary alloys. ... -
Atomic structures of precipitates in Al–Mg–Si alloys with small additions of other elements
(Journal article; Peer reviewed, 2018)In Al–Mg–Si alloys, additions of only a few weight percent of Mg and Si enable formation of hardening precipitates during heat treatment. The precipitation is complex and is influenced by chemical compositions and ... -
Atomic-scale 3D imaging of individual dopant atoms in an oxide semiconductor
(Peer reviewed; Journal article, 2022)The physical properties of semiconductors are controlled by chemical doping. In oxide semiconductors, small variations in the density of dopant atoms can completely change the local electric and magnetic responses caused ... -
Atomistic approach to simulate kink migration and kink-pair formation in silicon: The kinetic activation-relaxation technique
(Journal article; Peer reviewed, 2019)The energy conversion efficiency of solar cells based on multicrystalline silicon is greatly deteriorated by dislocations. However, an in-depth understanding on the dislocation motion dynamics down to atomic scale is still ... -
Atomistic details of precipitates in lean Al–Mg–Si alloys with trace additions of Ag and Ge studied by HAADF-STEM and DFT
(Journal article, 2017)Bonding energies and volume misfits for alloying elements and vacancies in multicomponent Al–Mg–Si alloys have been calculated using density functional theory (DFT). A detailed atomic scale analysis has been done for ... -
Atomistic modelling of Fe-Al and α-AlFeSi intermetallic compound interfaces
(Doctoral theses at NTNU;2020:86, Doctoral thesis, 2020)The joining of aluminum and steel has been considered an efficient solution for building light-weight technology, particularly in the automotive, aerospace and shipbuilding industries. It is an immense challenge to join ...