Browsing Institutt for materialteknologi by Title

Now showing items 1090-1109 of 2509

    • Improved catalytic activity of mixed platinum catalysts supported on various carbon nanomaterials 

      Zhang, Jie; Tang, Shuihua; Liao, L; Yu, W; Li, J; Seland, Frode; Haarberg, Geir Martin (Journal article; Peer reviewed, 2014)
      Electrocatalyst support affects not only catalytic activity of a catalyst, but also mass transportation and electron transfer in the catalyst layers of an electrode for proton exchange membrane fuel cells. Multi-dimensional ...

    • Improved cyclability of Nickel-rich layered oxides 

      Wagner, Nils Peter; Tolchard, Julian R; Tron, Artur; Pollen, Harald Norrud; Gaertner, Heiko; Vullum, Per Erik (Peer reviewed; Journal article, 2020)
      This study compares the physico- and electro- chemical properties of LiNi0.8Mn0.10Co0.1O2 (NMC811) and LiNi0.83Mn0.06Co0.09Al0.1O2 (NMCA) prepared by an oxalic acid co-precipitation. Deposition of a SiO2 surface coating ...

    • Improved electrochemical performance and solid electrolyte interphase properties of electrolytes based on lithium bis(fluorosulfonyl)imide for high content silicon anodes 

      Asheim, Karina; Vullum, Per Erik; Wagner, Nils Peter; Andersen, Hanne Flåten; Mæhlen, Jan Petter; Svensson, Ann Mari (Journal article; Peer reviewed, 2022)
      Electrodes containing 60 wt% micron-sized silicon were investigated with electrolytes containing carbonate solvents and either LiPF6 or lithium bis(fluorosulfonyl)imide (LiFSI) salt. The electrodes showed improved performance, ...

    • Improved Induced Diode Photodetectors by Increased Fixed Charge in PECVD Amorphous Silicon Nitride 

      Bazilchuk, Molly Strimbeck (Master thesis, 2014)
      The predictable quantum efficient detector (PQED) is a cheaper, more practical alternative to the current radiometric primary standard, the cryogenic radiometer. The PQED is made of an induced diode, a rectifying junction ...

    • An improved modelling framework for strength and work hardening of precipitate strengthened Al–Mg–Si alloys 

      Lu, Feng; Sunde, Jonas Kristoffer; Marioara, Calin Daniel; Holmestad, Randi; Holmedal, Bjørn (Journal article; Peer reviewed, 2022)
      A modelling framework for the strength and work hardening contributions in age hardened Al–Mg–Si alloys is presented. The modelling work is based on transmission electron microscopy (TEM) measurements of the needle-shaped ...

    • Improved Synthetic Methodology, Substrate Scope and X-ray Crystal Structure for N, N’-disubstituted Guanidines 

      Elumalai, Vijayaragavan; Eigner, Václav; Visnes, Torkild; Sundby, Eirik; Hoff, Bård Helge (Peer reviewed; Journal article, 2024)
      Guanidine is a privileged scaffold in drug discovery. Herein we report our investigations into the acid promoted amination of pyrimidine-bearing cyanamide to produce N, N’-disubstituted guanidines. Hydrochloric acid was ...

    • Improvement of surface properties of high pressure laminates 

      Rusu, Caterina Lesaint (Doctoral theses at NTNU;2018:59, Doctoral thesis, 2018)
      Laminated flooring is an important part of the decorative laminates market. High pressure laminates in particular are preferred products for flooring due to their outstanding properties such as fire and stain resistance, ...

    • Improving ageing kinetics and precipitation hardening in an Al-Mg-Si alloy by minor Cd addition 

      Qian, Feng; Mørtsell, Eva Anne; Marioara, Calin Daniel; Andersen, Sigmund Jarle; Li, Yanjun (Journal article; Peer reviewed, 2018)
      This study reports significant improvements in both the age hardening kinetics and peak hardness of an Al-Mg-Si alloy by microalloying with 0.06 at% Cd. A detailed high-angle annular dark-field scanning transmission electron ...

    • Improving Quantification of Sigma and Chi Phases in SDSS with EBSD 

      Østerhus, Vetle Runestad (Master thesis, 2020)
      Super duplex rustfrie stål (SDSS) blir på grunn av deres kombinasjon av høy korrosjonsmotstand og gode mekaniske egenskaper brukt i industrier hvor disse materialegenskapene er nødvendige, f.eks. i olje- og gassindustrien. ...

    • Improving the Dynamic Sensing Range of Electrochemical Enzymatic Lactate Biosensors for Sweat Monitoring Applications 

      Leinebø, Charlotte Amalie (Master thesis, 2023)
      Svette er en lett tilgjengelig kroppsvæske for ikke-invasiv og kontinuerlig sanntidsmåling av laktat under fysisk aktivitet. Elektrokjemiske enzym-baserte biosensorer er lovende for integrering i en bærbar sensorenhet, da ...

    • Impurities and Current Efficiency in Aluminum Electrolysis 

      Meirbekova, Rauan (Doctoral thesis at NTNU;2015:220, Doctoral thesis, 2015)
      Different factors can contribute to current efficiency loss in aluminum electrolysis and one of them is due to the presence of impurities. Concerns on impurities have been raised since decline in raw material quality and ...

    • Impurities in Ilmenite - Excess Iron 

      Norhaug, Sondre (Master thesis, 2015)
      During this master s thesis, batches of ilmenite with three different Fe/Ti-ratios were successfully synthesised. After synthesis, the batches underwent pre-oxidation, reduction with ThermoGravimetric Analysis (TGA), before ...

    • Impurities in Ilmenite: Magnesium 

      Kim, Pyung-Hwa (Master thesis, 2015)
      The influence of Mg as main impurity in ilmenite during gaseous reduction with CO and H2 gas was studied in this work. This is of interest for the ilmenite pre-reduction step in the Tyssedal Process as where the impurities ...

    • Impurities in the Crucible-Coating-Silicon System for Solar Cell Applications 

      Esser, Cecilie Bjørgen (Master thesis, 2015)
      Materials of high purity are required for the production of crystalline silicon for solar cells. Impurities are indeed very detrimental to solar cell efficiency. Contamination can occur at many stages during the processing, ...

    • Impurity control in high performance multicrystalline silicon 

      Stokkan, Gaute; Di Sabatino Lundberg, Marisa; Søndenå, Rune; Juel, Mari; Autruffe, Antoine; Adamczyk, Krzysztof; Skarstad, Hanna Vaksvik; Ekstrøm, Kai Erik; Wiig, Marie Syre; You, Chang Chuan; Haug, Halvard; M'hamdi, Mohammed (Journal article; Peer reviewed, 2017)
      We report results from a national project about impurities in high performance multicrystalline silicon: Contamination sources, transport routes, interaction with crystal defects and impact on solar cell efficiency parameters. ...

    • Impurity distribution and reduction behaviour of quartz in the production of high purity silicon 

      Dal Martello, Elena (Doktoravhandlinger ved NTNU, 1503-8181; 2012:182, Doctoral thesis, 2012)
      The production of solar grade silicon is based on the use of expensive high purity carbon and quartz feedstock as well as various silicon refining techniques. Impurities in the feedstock materials enter the silicon during ...

    • Impurity effect of Mg on the generalized planar fault energy of Al 

      Zhao, Dongdong; Løvvik, Ole Martin; Marthinsen, Knut; Li, Yanjun (Journal article; Peer reviewed, 2016)
      Generalized planar fault energy (GPFE) curves are widely used to evaluate the deformation behavior of metals and alloys. In the present work, a systematic analysis of the microscopic plastic deformation mechanism of ...

    • Impurity Elements in Raw Gas Ultra-Fines from Aluminium Electrolysis Cells 

      Gaertner, Heiko; Ratvik, Arne Petter; Aarhaug, Thor Anders (Journal article; Peer reviewed, 2012)
      The effect of alumina feeding and pot suction rate on the amount and composition of fine particles in raw gases has been investigated. Particle size distribution of ultra-fines (Di < 10 μm) were measured in real time and ...

    • Impurity removal from Si by Si-Ca-Mg ternary alloying-leaching system 

      Zhu, Mengyi; Wan, Di; Tang, Kai; Safarian, Jafar (Peer reviewed; Journal article, 2020)
      In this work, Si-Ca-Mg alloys were made with different compositions and solidification conditions to investigate the impurity segregation and separation performance from Si, especially for the crucial P impurity at several ...

    • Impurity segregation at defects in Al and Si -A theoretical DFT based study 

      Zhao, Dongdong (Doctoral theses at NTNU;2017:273, Doctoral thesis, 2017)
      Alien impurity elements favor to stay at the defects, e.g. stacking fault, grain boundary (GB) in host materials and thus influence many material properties. On basis of atomistic simulations, the present thesis puts a ...