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The influence of temperature on cellulose swelling at constant water density.
(Peer reviewed; Journal article, 2022)We have in this paper investigated how water sorbs to cellulose. We found that both cellulose nanofibril (CNF) and cellulose nanocrystal (CNC) films swell similarly, as they are both mainly composed of cellulose. CNF/CNC ... -
The influence of temperature on cellulose swelling at constant water density
(Peer reviewed; Journal article, 2022)We have in this paper investigated how water sorbs to cellulose. We found that both cellulose nanofibril (CNF) and cellulose nanocrystal (CNC) films swell similarly, as they are both mainly composed of cellulose. CNF/CNC ... -
Influence of the Crude Oil and Water Compositions on the Quality of Synthetic Produced Water
(Journal article; Peer reviewed, 2017)Produced water originates from crude oil production. It is a mixture of organic and inorganic compounds, and its composition is highly oilfield-dependent. The present study was carried out to increase the understanding of ... -
Influence of Wax Inhibitor Molecular Weight on Solution Crystallization and Rheology of Monodisperse Waxes
(Peer reviewed; Journal article, 2021)Molecular weight fractionation via stepwise precipitation or chain scission is performed on four pour point depressant polymers to study the pour point reduction mechanism. An homologous series of model oils is prepared ... -
Influence of wax inhibitor molecular weight: Fractionation and effect on crystallization of polydisperse waxes
(Journal article; Peer reviewed, 2019)The influence of wax inhibitor molecular weight on wax crystallization was investigated in three steps: (1) Wax inhibitor fractionation via stepwise precipitation or ultrasonic disintegration, (2) characterization of ... -
Inhibiting carbon growth at the initial stage of metal dusting corrosion of high temperature alloys
(Doctoral theses at NTNU;2020:212, Doctoral thesis, 2020)Metal dusting corrosion is a high temperature degradation phenomenon affecting Fe-, Ni- and Co- based alloys when exposed to strongly carburizing gases (carbon activity ac > 1) at elevated temperatures (> 400˚C). The alloy ... -
Inhibition of metal dusting corrosion on Fe-based alloy by combined near surface severe plastic deformation (NS-SPD) and thermochemical treatment
(Peer reviewed; Journal article, 2021)Combined NS-SPD and thermochemical treatment has been used to improve the metal dusting corrosion resistance of Incoloy 800. After testing under infinite carbon activity for 20−100 h, carbon was not found in the NS-SPD ... -
Inhibitor-wax interactions and PPD effect on wax crystallization: New approaches for GC/MS and NMR, and comparison with DSC, CPM, and rheometry
(Journal article; Peer reviewed, 2019)Three pour point depressants (PPDs) with different chemistries, and extracted asphaltenes were studied in their influence on wax crystallization in a model system. A new procedure for nuclear magnetic resonance (NMR) was ... -
Inhibitor-Wax Interactions and Wax Crystallization: New Experimental Approaches and Techniques
(Doctoral theses at NTNU;2018:410, Doctoral thesis, 2018)Issues related to wax crystallization are one of the major challenges faced during crude oil production. Wax inhibitors and pour point depressants (PPD) are in common use for wax prevention, as they can delay gelling and ... -
Initial stages of metal dusting corrosion
(Master thesis, 2015)Metal dusting is a disintegration phenomenon of metals and alloys into fine, dust-like particles. Metal dusting can be found in different reforming units in the petrochemical industry. As well as in reforming units, it can ... -
Initial Stages of Metal Dusting Corrosion - Surface and subsurface investigation using SEM, Raman spectroscopy, and STEM
(Master thesis, 2018)Metal dusting (MD) is a corrosion phenomenon that often occurs in industrial processes involving syngas. Carbon deposited on vessel walls gradually causes disintegration of the bulk metal. Because MD is related to carbon ... -
Initialization Methods for large Process Models
(Master thesis, 2019)Modellbygging er en viktig del av enhver modelldrevet forskning. Mange aspekter ved modellering er tidkrevende, hvorav en er initialiseringen når modellene blir store. Denne oppgaven presenterer implementeringen av en ... -
Initialization, Phase stability and dynamic Simulation of a thermodynamic Control Volume
(Master thesis, 2011)hei -
INJECTION OF SYNTHETIC PRODUCED WATER INTO POROUS MEDIA - A study of transport of dispersed components through simulated reservoir packs
(Master thesis, 2018)Produced water(PW) contributes to the largest volume byproduct from the oil production industry. The presence of hazardous chemicals makes the handling of PW an important and costly operation. Methods such as discharge ... -
Input transformation for linearization, decoupling and disturbance rejection with application to steam networks
(Peer reviewed; Journal article, 2021)Pressure-flow networks are inherently multivariable, coupled and nonlinear systems that are not straightforward handled by conventional PID controllers. In this work, we analyze the control problem for a steam distribution ... -
Insight into Size- and Metal-Dependent Activity and the Mechanism for Steam Methane Re-forming in Nanocatalysis
(Peer reviewed; Journal article, 2020)Systematic and in-depth understanding of size- and metal-dependent activity plays a pivotal role in nanocatalysis for rational design of highly efficient catalysts. Herein, we report an approach combining microkinetic ... -
Insights into Activated Carbon-Supported Platinum Catalysts for Base-Free Oxidation of Glycerol
(Journal article; Peer reviewed, 2016)Two kinds of activated carbon (AC)-supported Pt catalysts with similar particle sizes were respectively synthesized using the polyol method and incipient wetness impregnation method, and then tested for glycerol oxidation ... -
Insights into Growth Mechanism, Control of Particle Size and Particle Size Distribution of Silica Coated Iron Oxide Nanoparticles
(Master thesis, 2021)Iron oxide nanoparticles (IONPs) with desirable surface chemistry display many unique properties that can be applied in modern biomedical applications, including cancer diagnostics, magnetic resonance imaging, hyperthermia, ... -
Insights into hydrogen transport behavior on perovskite surfaces: Transition from the Grotthuss mechanism to the “vehicle” mechanism
(Journal article; Peer reviewed, 2019)Hydrogen transport on transition-metal oxides is a shared process in many important physical and chemical changes of interest. In this work, DFT + U calculations have been carried out to explore the mechanism for hydrogen ... -
Insights into size-dependent activity and active sites of Au nanoparticles supported on TS-1 for propene epoxidation with H2 and O2
(Journal article; Peer reviewed, 2014)Propene epoxidation with H2/O2 is a typical structure-sensitive reaction. For a given support containing tetra-coordinated Ti species such as TS-1, the catalytic activity is greatly influenced by supported Au nanoparticle ...