Blar i NTNU Open på forfatter "Andreassen, Jens-Petter"
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A correlative spatiotemporal microscale study of calcium phosphate formation and transformation within an alginate hydrogel matrix.
Bassett, David; Ucar, Seniz; Sikorski, Pawel; Andreassen, Jens-Petter; Bjørnøy, Sindre Hove; Strand, Berit Løkensgard (Journal article; Peer reviewed, 2016)The modification of soft hydrogels with hard inorganic components is a method used to form composite materials with application in non-load-bearing bone tissue engineering. The inclusion of an inorganic component may provide ... -
Biocomposites prepared by alkaline phosphatase mediated mineralization of alginate microbeads
Xie, Minli; Magnus Østgård, Olderøy; Zhang, Zhibing; Andreassen, Jens-Petter; Strand, Berit Løkensgard; Sikorski, Pawel (Journal article; Peer reviewed, 2012)This study set out to develop a biomimetic scaffold by incorporating osteoinductive hydroxyapatite (HA) particles into a porous alginate gel matrix via a cell-friendly pathway. Two types of alginate/calcium phosphate ... -
Controlled mineralisation and recrystallisation of brushite within alginate hydrogels
Bjørnøy, Sindre Hove; Bassett, David; Ucar, Seniz; Sikorski, Pawel; Andreassen, Jens-Petter (Journal article; Peer reviewed, 2016-02)Due to high solubility and fast resorption behaviour under physiological conditions, brushite (CaHPO4⋅2H2O, calcium monohydrogen phosphate dihydrate, dicalcium phosphate dihydrate) has great potential in bone regeneration ... -
Crystal Growth and Morphology Development from Aqueous Solutions
Wang, Lijuan (Doctoral theses at NTNU;2022:265, Doctoral thesis, 2022)Crystalline materials are found in a numerous variety of geometrical forms both in nature and when produced synthetically. As a result, pathways of crystal nucleation, growth and assembly into larger structures have evoked ... -
Crystal Growth Kinetics of Calcium Carbonate Particles in Natural Gas Production
Krossholm, Charlotte Kleven (Master thesis, 2012)Precipitation of calcium carbonate particles is an interesting area in natural gas production. The inorganic salt could be formed due to pH stabilization for corrosion control in the pipelines and during the regeneration ... -
Crystal growth of calcium carbonate - growth rate determination and method evaluation
Aanonsen, Charlotte (Master thesis, 2013)- -
Crystallization behavior of an X-Ray Contrast Agent Intermediate at high Supersaturations and Temperatures
Bakke, Bjørnar (Master thesis, 2016)This project comprises studies of crystallization of an aromatic amine, which is an intermediate in the production of the X-ray contrast agent Iohexol at GE Healthcare Lindesnes Site. Crystallizations from highly supersaturated ... -
Crystallization kinetics and growth of struvite crystals by seawater versus magnesium chloride as magnesium source: Towards enhancing sustainability and economics of struvite crystallization
Shaddel, Sina; Grini, Tonje; Andreassen, Jens-Petter; Østerhus, Stein Wold; Ucar, Seniz (Peer reviewed; Journal article, 2020)The recycling of nutrients from wastewater and their recovery in the form of valuable products is an effective strategy to accelerate the circular economy concept. Phosphorus recovery from wastewater by struvite crystallization ... -
The Effect of Alkalinity, Magnesium and Ferrous on the Precipitation of Calcium Carbonate at Pre-Treatment Conditions of Mono Ethylene Glycol
Nautnes, Ragnhild (Master thesis, 2016)Mono ethylene glycol (MEG) is used to prevent formation of gas hydrate in the pipes transporting natural gas. The MEG is regenerated in a closed MEG loop, where water and salts are removed. The divalent ions are harder to ... -
The Effect of Reaction Conditions and Presence of Magnesium on the Crystallization of Nickel Sulfate
Jenssen, Ina Beate; Bøckman, Oluf; Andreassen, Jens-Petter; Ucar, Seniz (Peer reviewed; Journal article, 2021)Recycling of valuable metals such as nickel is instrumental to meet the need from the dramatic increase in electric vehicle battery production and to improve its sustainability. Nickel required in the battery manufacture ... -
The Effect of Supersaturation and Additives on Calcium Carbonate Scaling at Mono Ethylene Glycol Pre-Treatment Conditions
Neteland, Marte (Master thesis, 2017)In this report the effect of supersaturation and additives on calcium carbonate scaling under mono ethylene glycol (MEG) pre-treatment conditions (T=80°C and 50 wt% MEG) have been studied. The additives used are magnesium ... -
Effects of Seeding on the Crystallization Behaviour and Filtration Abilities of an Aromatic Amine
Linga, Åsmund (Master thesis, 2017)One of the intermediates in the production of X-ray contrast agents at GE Healthcare Lindesnes, commonly referred to as an aromatic amine, is subject to a crystallization. Crystallization parameters such as size, size ... -
Engineering of struvite crystals by regulating supersaturation – Correlation with phosphorus recovery, crystal morphology and process efficiency
Shaddel, Sina; Ucar, Seniz; Andreassen, Jens-Petter; Østerhus, Stein Wold (Journal article; Peer reviewed, 2019)Struvite crystallization is widely applied for nutrient recovery from wastewater streams. The better understanding of the effects of reaction conditions on final crystal properties will contribute to improve both the ... -
Enhancing efficiency and economy of phosphorus recovery process by customizing the product based on sidestream characteristics
Shaddel, Sina; Ucar, Seniz; Andreassen, Jens-Petter; Østerhus, Stein Wold (Journal article; Peer reviewed, 2019)The enhanced biological phosphorus removal process makes the phosphorus recovery feasible from the dewatering streams of biological sludge. The physicochemical properties of these sidestreams, as an input to a crystallizer, ... -
Filtration Properties of Ferric Hydroxide Precipitate in Nickel Production
Jenssen, Ina Beate; Aufles Hines, Mona; Dotterud, Ole Morten; Bøckman, Oluf; Andreassen, Jens-Petter (Chapter, 2018)Ferric iron removal from the nickel electrolyte at Glencore Nikkelverk AS in Kristiansand, Norway, is achieved by precipitation of iron hydroxide followed by filtration, and it is desirable to improve filtration properties ... -
Fine-Tuning of Particle Size and Morphology of Silica Coated Iron Oxide Nanoparticles
Ali, Zeeshan; Andreassen, Jens-Petter; Bandyopadhyay, Sulalit (Journal article; Peer reviewed, 2023) -
Fluoride Adsorption On Iron Hydroxide Oxide Pricipitates During Zinc Prodcuction
Soundaranathan, Mithushan (Master thesis, 2017)In the zinc smelters at Boliden Odda, the zinc is extracted from the purified zinc sulphate solution by electrowinning. If the purified zinc sulphate contains more than 35 mg/L fluoride, the extracted zinc cannot be removed ... -
Formation of Hydroxyapatite via Transformation of Amorphous Calcium Phosphate in the Presence of Alginate Additives
Ucar, Seniz; Bjørnøy, Sindre Hove; Bassett, David; Strand, Berit Løkensgard; Sikorski, Pawel; Andreassen, Jens-Petter (Journal article; Peer reviewed, 2019)Hydroxyapatite (HA) is the primary mineral of vertebral tooth and bone tissue; thus, it is often incorporated into synthetic composite materials designed for hard tissue engineering applications. Understanding the formation ... -
Gelling kinetics and in situ mineralization of alginate hydrogels: A correlative spatiotemporal characterization toolbox.
Åslund, Andreas; Bassett, David; Ucar, Seniz; Sikorski, Pawel; Andreassen, Jens-Petter; Mandaric, Stefan; Bjørnøy, Sindre Hove; Strand, Berit Løkensgard (Journal article; Peer reviewed, 2016)Due to their large water content and structural similarities to the extracellular matrix, hydrogels are an attractive class of material in the tissue engineering field. Polymers capable of ionotropic gelation are of special ... -
Growing gold nanostructures for shape-selective cellular uptake
Bandyopadhyay, Sulalit; McDonagh, Birgitte Hjelmeland; Singh, Gurvinder; Raghunathan, Karthik; Sandvig, Axel; Sandvig, Ioanna; Andreassen, Jens-Petter; Glomm, Wilhelm (Journal article; Peer reviewed, 2018)With development in the synthesis of shape- and size-dependent gold (Au) nanostructures (NSs) and their applications in nanomedicine, one of the biggest challenges is to understand the interaction of these shapes with ...