Blar i NTNU Open på forfatter "Andreassen, Jens-Petter"
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Growth and Aggregation Phenomena in Precipitation of Calcium Carbonate
Andreassen, Jens-Petter (Dr. ingeniøravhandling, 0809-103X; 2001:49, Doctoral thesis, 2001)Particle size-enlargement processes in precipitation of calcium carbonate have been investigated by focusing on determination of crystal growth rates and aggregation rates of the metastable polymorph vaterite. This was ... -
Insights into Growth Mechanism, Control of Particle Size and Particle Size Distribution of Silica Coated Iron Oxide Nanoparticles
Ali, Zeeshan (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, ... -
Investigation into the Performance of Candle Filter Technology for the Separation of Metal Hydroxide Precipitates from an Aqueous Effluent
Kuiper, Elizabeth Camilla (Master thesis, 2014)The effluent treatment plant at Glencore Nikkelverk experiences the generation of liquid waste from various areas and processes in the plant. Being primarily a nickel refinery, but also producing copper and cobalt, the ... -
Mineral scaling in natural gas processing – a classical crystallization phenomenon
Broby, Margrethe (Doctoral theses at NTNU;2019:72, Doctoral thesis, 2019)Summary of thesis: Scaling is the formation of mineral deposits on surfaces. During petroleum production, these crystalline layers can affect surfaces everywhere from the well to production equipment onshore. When the ... -
Nucleation and Growth of Brushite in the Presence of Alginate
Ucar, Seniz; Bjørnøy, Sindre Hove; Bassett, David; Strand, Berit Løkensgard; Sikorski, Pawel; Andreassen, Jens-Petter (Journal article, 2015)Biomineral formation in vivo is a complex process regulated by functional molecules. Highlighting the mechanisms underlying biomineralization is necessary for a better understanding of in vivo processes and for enhanced ... -
Nucleation kinetics and polymorphism of calcium carbonate particles in natural gas production
Barland, Astrid Odland (Master thesis, 2012)Precipitation of calcium carbonate in pipes and process equipment is a widespread problem in natural gas production as we know it today. Studies of calcium carbonate systems are crucial to prevent this problem. When the ... -
Nutrient recovery from wastewater by crystallization - Improving the process efficiency, economics and product quality
Shaddel, Sina (Doctoral theses at NTNU;2020:375, Doctoral thesis, 2020)The long-term strategic design of wastewater treatment plants requires measures to address a range of sustainability challenges, including the rapid population growth, climate change, urbanization and stressful position ... -
Precipitation of carbonates in the pretreatment process for regeneration of ethylene glycol
Montazaud, Thomas (Master thesis, 2011)Ethylene Glycol regeneration is an important process in natural gas production. This work aims at defining the best parameters with which this process can be achieved using a new process developed by Statoil. -
Precipitation of silver particles with controlled morphologies from aqueous solutions
Wang, Lijuan; Andreassen, Jens-Petter; Ucar, Seniz (Journal article; Peer reviewed, 2019)Synthesis of silver particles with controlled morphologies enables their use in a variety of applications. Although several synthetic approaches have been developed to successfully modify the final particle shape, the ... -
Purification and impurity uptake of hydrated Nickel sulfate salts from aqueous solution with common process impurities
Storøy, Fredrik Skadsem (Master thesis, 2019)Nikkelsulfat salter er en av komponentene som brukes i katoden av moderne Lithium-ion batterier i elektriske biler. Batterigrad nikkelsulfat salter er rengjort og separert via krystallisasjon. Glencore Nikkelverk AS ... -
Removal of impurities from industrial hydrometallurgical processes by crystallization
Jenssen, Ina Beate (Doctoral theses at NTNU;2021:211, Doctoral thesis, 2021)Metals play a crucial role in our daily life, and are usually produced from raw materials coming from mineral ores, typically by hydrometallurgical processing. Hydrometallurgy is described as the use of aqueous media to ... -
Scaling of Calcium Carbonate at Heated Surfaces in a Continuous System
Nergaard, Margrethe (Master thesis, 2011)Scaling is the precipitation of a mineral layer on a surface. Sparingly soluble salts with inverse solubility, which calcium carbonate exhibits, will prefer precipitation at heated surfaces, making heat exchangers a target ... -
Scaling of Calcium Carbonate on a Heated Surface in a Flow Through System with Mono Ethylene Glycol.
Hyllestad, Ketil (Master thesis, 2013)Efficiency of industrial heat exchangers can be reduced due to precipitation of a solid mineral layer called scale. Reversibly soluble salts such as calcium carbonate are less soluble at elevated temperatures and therefore ... -
Simultaneous precipitation of Calcium Sulfate and Calcium Carbonate during MEG regeneration
Bache, Therese (Master thesis, 2016)Simultaneous precipitation of calcium carbonate and calcium sulfate in supersaturated solutions containing a MEG-water concentration containing 0, 50 or 90 wt% MEG, was investigated in a bath setup at constant pressure and ... -
Struvite crystallization by using raw seawater: Improving economics and environmental footprint while maintaining phosphorus recovery and product quality
Shaddel, Sina; Grini, Tonje; Ucar, Seniz; Azrague, Kamal; Andreassen, Jens-Petter; Østerhus, Stein Wold (Peer reviewed; Journal article, 2020)Seawater, as an alternative magnesium source, has the potential to improve the overall economics and environmental footprint of struvite production compared to the use of pure magnesium salts. However, the dilution effect ... -
Study of the Particle Properties of Iron Oxide/Hydroxide Precipitate in Nickel Production
Hines, Mona Aufles (Master thesis, 2017)The background for this thesis was crystallization of iron in nickel production at Glencore and a review of filterability properties of iron oxide/hydroxide precipitate. The nickel plant in Kristiansand produces nickel and ... -
Tailoring multifunctional nanoparticles for encapsulation of bio-molecules.
Raghunathan, Karthik (Master thesis, 2017)Nanoparticles(NPs) that can simultaneously perform multiple tasks could beused for sensing, imaging, monitoring, delivering drug among other things. Combining organic and inorganic NPs has been used to synthesize such ... -
Transformation of brushite to hydroxyapatite and effects of alginate additives
Ucar, Seniz; Bjørnøy, Sindre Hove; Bassett, David; Strand, Berit Løkensgard; Sikorski, Pawel; Andreassen, Jens-Petter (Journal article; Peer reviewed, 2016)Phase transformations are important processes during mineral formation in both in vivo and in vitro model systems and macromolecules are influential in regulating the mineralization processes. Calcium phosphate mineralized ... -
Tuning and tracking the growth of gold nanoparticles synthesized using binary surfactant mixtures
Antony, Jibin; Raghunathan, Karthik; Munir, Sarmad; Andreassen, Jens-Petter; Bandyopadhyay, Sulalit (Peer reviewed; Journal article, 2020)Synthesis of gold nanorods (Au NRs) using surfactant-mediated seeded growth involves the interplay of parameters such as pH, reducing agent, and surfactant among others. The use of binary surfactant mixtures of ... -
Understanding the growth and physico-chemical properties of multifunctional nanoparticles
Antony, Jibin (Master thesis, 2018)Gold nanoparticles (Au NPs) exhibit localized surface plasmon resonance (LSPR) that provides wide applications in photothermal therapy, imaging and other theranostic applications. Recently, understanding the growth of ...