Blar i NTNU Open på forfatter "Syverud, Kristin"
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The influence of temperature on cellulose swelling at constant water density.
Torstensen, Jonathan Økland; Ottesen, Vegar; Rodriguez Fabia, Sandra; Syverud, Kristin; Johansson, Lars; Lervik, Anders (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
Torstensen, Jonathan Økland; Ottesen, Vegar; Rodríguez-Fabià, Sandra; Syverud, Kristin; Johansson, Lars; Lervik, Anders (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 ... -
Interactions between Surfactants and Cellulose Nanofibrils for Enhanced Oil Recovery
Jakobsen, Trygve Dagsloth; Simon, Sebastien Charles; Heggset, Ellinor Bævre; Syverud, Kristin; Paso, Kristofer Gunnar (Journal article; Peer reviewed, 2018)Chemical enhanced oil recovery (EOR) represents a series of potential solutions for extracting more oil from resources with already known locations and magnitudes. Unfortunately, many of the chemical additives in use today ... -
Investigation of a new application for cellulose nanocrystals: a study of the enhanced oil recovery potential by use of a green additive
Molnes, Silje; Mamonov, Aleksandr; Paso, Kristofer Gunnar; Strand, Skule; Syverud, Kristin (Journal article; Peer reviewed, 2018)Cellulose nanocrystals (CNC) were investigated for use in a potential new application, enhanced oil recovery. Core flooding experiments were performed on outcrop sandstone cores using CNC particles dispersed in low salinity ... -
Mechanical properties of cellulose nanofibril films: effects of crystallinity and its modification by treatment with liquid anhydrous ammonia
Ottesen, Vegar; Larsson, Per Tomas; Chinga-Carrasco, Gary; Syverud, Kristin; Gregersen, Øyvind Weiby (Journal article; Peer reviewed, 2019)The influence of cellulose crystallinity on mechanical properties of cellulose nano-fibrils (CNF) was investigated. Degree of crystallinity (DoC) was modified using liquid anhydrous ammonia. Such treatment changes crystal ... -
Mechanical properties of composite hydrogels of alginate and cellulose nanofibrils
Aarstad, Olav Andreas; Heggset, Ellinor Bævre; Pedersen, Ina S.; Bjørnøy, Sindre Hove; Syverud, Kristin; Strand, Berit Løkensgard (Journal article; Peer reviewed, 2017)Alginate and cellulose nanofibrils (CNF) are attractive materials for tissue engineering and regenerative medicine. CNF gels are generally weaker and more brittle than alginate gels, while alginate gels are elastic and ... -
Mixing of cellulose nanofibrils and individual furnish components: Effects on paper properties and structure
Ottesen, Vegar; Syverud, Kristin; Gregersen, Øyvind Weiby (Journal article; Peer reviewed, 2016)Thermo-mechanical pulp (TMP) handsheets with different fractions of cellulose nano fibrils (CNF) and ground calcium carbonate (GCC) were made. CNF and retention chemicals were added in three different ways; to GCC, to long ... -
Nanocellulose-enriched hydrocolloid-based hydrogels designed using a Ca2+ free strategy based on citric acid
Lungu, Adriana; Cernencu, Alexandra I.; Dinescu, Sorina; Balahura, Roxana; Mereuta, Paul; Costache, Marieta; Syverud, Kristin; Stancu, Izabela C.; Iovu, Horia (Peer reviewed; Journal article, 2021)In this work fully biomass-based hydrogels were developed using a naturally occurring vegetable hydrocolloid co-mingled with wood-derived nanocellulose fibrils. Two distinct types of hydrocolloids have been considered: a ... -
Nanocomposite membranes with high-charge and size-screened phosphorylated nanocellulose fibrils for CO2 separation
Helberg, Ragne M Lilleby; Torstensen, Jonathan Økland; Dai, Zhongde; Janakiram, Saravanan; Chinga-Carrasco, Gary; Gregersen, Øyvind Weiby; Syverud, Kristin; Deng, Liyuan (Peer reviewed; Journal article, 2020)In this study, cellulose nanofibrils (CNF) of high charge (H-P-CNF) and screened size (H-P-CNF-S) were fabricated by increasing the charge of phosphorylated cellulose nanofibrils (P-CNFs) during the pre-treatment step of ... -
Oil-in-Water Emulsions Stabilized by Cellulose Nanofibrils—The Effects of Ionic Strength and pH
Aaen, Ragnhild; Brodin, Fredrik Wernersson; Simon, Sebastien Charles; Heggset, Ellinor Bævre; Syverud, Kristin (Journal article; Peer reviewed, 2019)Pickering o/w emulsions prepared with 40 wt % rapeseed oil were stabilized with the use of low charged enzymatically treated cellulose nanofibrils (CNFs) and highly charged 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized ... -
Polymeric 3D scaffolds for tissue regeneration: Evaluation of biopolymer nanocomposite reinforced with cellulose nanofibrils
Campodoni, Elisabetta; Heggset, Ellinor Bævre; Elsebahy, Ahmad Rashad Saad Mohamed; Ramírez-Rodríguez, Gloria; Mustafa, Kamal Babikeir Eln; Syverud, Kristin; Tampieri, Anna; Sandri, Monica (Peer reviewed; Journal article, 2019)Biopolymers such as gelatin (Gel) and cellulose nanofibrils (CNF) have many of the essential requirements for being used as scaffolding materials in tissue regeneration; biocompatibility, surface chemistry, ability to ... -
Porous filters of nanofibrillated cellulose
Sandberg, Linn Ingunn C. (Master thesis, 2011)Filters for air purification are predominantly produced of synthetic and non-biodegradable materials. In this work, a range of various air filters have been prepared from 100% pure cellulosic material, with the goal to ... -
Preparation of cellulose nanofibrils for imaging purposes: comparison of liquid cryogens for rapid vitrification
Torstensen, Jonathan Ø; Johnsen, Per-Olav; Riis, Henrik; Spontak, Richard J; Deng, Liyuan; Gregersen, Øyvind Weiby; Syverud, Kristin (Journal article; Peer reviewed, 2018)Artifact-free imaging of cellulose nanofibrils (CNFs) from aqueous nanocellulose suspensions is nontrivial due to frequent irreversible agglomeration and structure damage during the course of sample preparation, especially ... -
PVA/nanocellulose nanocomposite membranes for CO2 separation from flue gas
Torstensen, Jonathan Økland; Helberg, Ragne M Lilleby; Deng, Liyuan; Gregersen, Øyvind Weiby; Syverud, Kristin (Peer reviewed; Journal article, 2019)In this paper, we explore the use of nanocelluloses as an additive to poly (vinyl alcohol) (PVA) nanocomposite membranes for CO2/N2 mixed-gas separation. Our findings are that several types of nanocellulose can be used to ... -
Responses of Rat Mesenchymal Stromal Cells to Nanocellulose with Different Functional Groups
Elsebahy, Ahmad Rashad; Grøndahl, Martha; Heggset, Ellinor Bævre; Mustafa, Kamal Babikeir Elnour; Syverud, Kristin (Peer reviewed; Journal article, 2023)Cellulose nanofibrils (CNFs) are multiscale hydrophilic biocompatible polysaccharide materials derived from wood and plants. TEMPO-mediated oxidation of CNFs (TO-CNF) turns some of the primary hydroxyl groups to carboxylate ... -
Risk for mould growth in insulation materials
Heggebø, Ada Cecilie (Master thesis, 2014)The aim of this project has been to evaluate what effect different types of fire retardant additives have on mold growth in cellulose insulations. The cellulose insulation materials used have been prepared from two different ... -
Swelling and Free-Volume Characteristics of TEMPO-Oxidized Cellulose Nanofibril Films
Torstensen, Jonathan Ø; Liu, Ming; Jin, Soo-Ah; Deng, Liyuan; Hawari, Ayman I.; Syverud, Kristin; Spontak, Richard J.; Gregersen, Øyvind Weiby (Journal article; Peer reviewed, 2018) -
Swelling of individual cellulose nanofibrils in water, role of crystallinity: an AFM study
Ottesen, Vegar; Syverud, Kristin (Peer reviewed; Journal article, 2020)Atomic force microscopy (AFM) can be used to quantitatively study nanomaterials in different media, e.g. vacuum, air, or submerged in a liquid. A technique was developed to study swelling of individual cellulose nanofibrils ... -
The effects of pH, time and temperature on the stability and viscosity of cellulose nanocrystal (CNC) dispersions: implications for use in enhanced oil recovery
Molnes, Silje; Paso, Kristofer Gunnar; Strand, Skule; Syverud, Kristin (Journal article; Peer reviewed, 2017)Cellulose nanocrystals (CNC) are currently being investigated as potential additives for enhanced oil recovery (EOR). Presented in this paper is a study investigating the effects of different physical and chemical environments ... -
The potential of TEMPO-oxidized cellulose nanofibrils as rheology modifiers in food systems
Aaen, Ragnhild; Simon, Sebastien Charles; Brodin, Fredrik Wernersson; Syverud, Kristin (Journal article; Peer reviewed, 2019)Cellulose nanofibrils (CNFs) have been proposed for use in low-fat food products due to their availability and excellent viscosifying and gel forming abilities. As the CNFs are negatively charged, the presence of other ...