Browsing by Author "Syverud, Kristin"
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Cellulose Nanofibrils as Paper Additive and Coating Material: Properties, Distribution and Interaction Effects
Ottesen, Vegar (Doctoral theses at NTNU;2018:115, Doctoral thesis, 2018)Cellulose is well-known as the most common bio-polymer on earth. In the cell wall of most plants, it is organized in nanoscopic structures with interesting properties for a wide range of applications, among them as an ... -
Coatability of cellulose nanofibril suspensions: Role of rheology and water retention
Kumar, Vinay; Ottesen, Vegar; Syverud, Kristin; Gregersen, Øyvind Weiby; Toivakka, Martti (Journal article; Peer reviewed, 2017)Cellulose nanofibril (CNF) suspensions are not easily coatable because of their excessively high viscosity and yield stress, even at low solids concentrations. In addition, CNF suspensions vary widely in their properties ... -
Coating 3D Printed Polycaprolactone Scaffolds with Nanocellulose Promotes Growth and Differentiation of Mesenchymal Stem Cells
Elsebahy, Ahmad Rashad Saad Mohamed; Mohamed-Ahmed, Samih; Ojansivu, Miina; Berstad, Kaia; Yassin, Mohammed Ahmed; Kivijärvi, Tove; Heggset, Ellinor Bævre; Syverud, Kristin; Mustafa, Kamal Babikeir Eln (Journal article; Peer reviewed, 2018)3D printed polycaprolactone (PCL) has potential as a scaffold for bone tissue engineering, but the hydrophobic surface may hinder optimal cell responses. The surface properties can be improved by coating the scaffold with ... -
Construction of Nanocellulose Microcapsules for Research and Sensor Applications
Tonstad, Sandra Karen (Master thesis, 2018)Nanocellulose microcapsules with internal hollows have previously been found to form when cellulose nanofibrils (CNF) are added to paper pulp before drying. In an effort to study such capsules removed from the paper matrix, ... -
Cross-linking oxidized cellulose nanofibrils for the formation of stable hydrogel structures
Pettersen, Sigurd Rolland (Master thesis, 2013)The main goal of this project was to investigate whether the elastic properties of microfibrillated cellulose (MFC) suspensions pre-treated by TEMPO-mediated oxidation could be controlled by inducing cross-links between ... -
Cytocompatibility and Functionalization of Nanocellulose for Bone Tissue Engineering Applications
Grøndahl, Martha (Master thesis, 2019)I denne masteroppgaven er overflateegenskaper til nanocellulosegeler som armering (scaffold) innenfor benvevsregenererings (BVR) applikasjoner utforsket. Nanocellulose er et materiale av stor interesse innenfor mange ... -
Development of Kraft Lignin and Coating Technique to Prepare Coated Urea Fertilizers with Increased Nutrient Use Efficiency
Xu, Xueyan (Master thesis, 2017)Coating urea to prepare controlled release N-fertilizer has been considered as an effective way to increase its nutrient use efficiency, thus reduce its waste and the consequent harmful environmental impacts. Inorganic ... -
High-Temperature Core Flood Investigation of Nanocellulose as a Green Additive for Enhanced Oil Recovery
Aadland, Reidun Cecilie Grønfur; Jakobsen, Trygve Dagsloth; Heggset, Ellinor Bævre; Long-Sanouiller, Haili; Simon, Sebastien Charles; Paso, Kristofer Gunnar; Syverud, Kristin; Torsæter, Ole (Journal article; Peer reviewed, 2019)Recent studies have discovered a substantial viscosity increase of aqueous cellulose nanocrystal (CNC) dispersions upon heat aging at temperatures above 90 °C. This distinct change in material properties at very low ... -
Identification of Nanocellulose Retention Characteristics in Porous Media
Aadland, Reidun Cecilie Grønfur; Dziuba, Carter Jordan; Heggset, Ellinor Bævre; Syverud, Kristin; Torsæter, Ole; Holt, Torleif; Gates, Ian D.; Bryant, Steven (Journal article; Peer reviewed, 2018)The application of nanotechnology to the petroleum industry has sparked recent interest in increasing oil recovery, while reducing environmental impact. Nanocellulose is an emerging nanoparticle that is derived from trees ... -
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 ... -
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 ... -
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 ... -
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) -
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 ...