Blar i NTNU Open på forfatter "Ottesen, Vegar"
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A Brief Review of Nanocellulose Based Hybrid Membranes for CO2 Separation
Dai, Zhongde; Ottesen, Vegar; Deng, Jing; Helberg, Ragne M Lilleby; Deng, Liyuan (Journal article; Peer reviewed, 2019)Due to the high specific surface area, high mechanical strength and broad possibility of surface modification, nanocellulose has obtained much attention as a new class of bio-based nanomaterials with promising potential ... -
Bacterial Microarrays by Microcontact Printing: Development of a Method for Immobilizing Live Bacteria on Microarrays
Ottesen, Vegar (Master thesis, 2014)Traditional microbiological experimental methods generally reveal population-wide statistics and are not capable of revealing variations between individual cells. In an effort to address this, a cheap, quick and easy means ... -
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 ... -
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, ... -
Effect of design geometry, exposure energy, cytophilic molecules, cell type and load in fabrication of single-cell arrays using micro-contact printing
Bhujbal, Swapnil Vilas; Dekov, Maren; Ottesen, Vegar; Dunker, Karen; Lale, Rahmi; Sletmoen, Marit (Journal article; Peer reviewed, 2020)In this study a range of factors influencing the fabrication of single-cell arrays (SCAs) are identified and investigated. Micro-contact printing was used to introduce spots coated with polyethyleneimine or Matrigel on ... -
A fast, low-cost, robust and high-throughput method for viral nucleic acid isolation based on NAxtra magnetic nanoparticles
Ravlo, Erlend; Sousa, Mirta; Andresen, Lise Lima; Holberg-Petersen, Mona; Klundby, Ingvild; Aas, Per Arne; Hagen, Lars; Erlandsen, Sten Even; Fossum, Janne; Ali, Zeeshan; Sharma, Anuvansh; Ottesen, Vegar; Bandyopadhyay, Sulalit; Bjørås, Magnar (Peer reviewed; Journal article, 2023)The year of 2020 was profoundly marked by a global pandemic caused by a strain of coronavirus named severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the etiological agent of coronavirus disease 2019 (COVID-19). ... -
FIB/SEM Characterization of Paper Materials
Roede, Erik Dobloug (Master thesis, 2016)3D microscopy is of interest for structural characterization of paper materials to study the use of cellulose nanofibrils as a paper additive. Focused ion beam (FIB) tomography is a promising microscopy technique for this ... -
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 ... -
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 ... -
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 ... -
Morphology of lignin structures on fiber surfaces after organosolv pretreatment
Joseph, Prajin; Ottesen, Vegar; Tanase-Opedal, Mihaela; Moe, Størker T. (Peer reviewed; Journal article, 2022)The redeposition of lignin to the fiber surface after organosolv pretreatment was studied using two different reactor types. Results from the conventional autoclave reactor suggest that redeposition occurs during the cooling ... -
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 Design of Simple Bacterial Microarrays: Development towards Immobilizing Single Living Bacteria on Predefined Micro-Sized Spots on Patterned Surfaces
Arnfinnsdottir, Nina Bjørk; Ottesen, Vegar; Lale, Rahmi; Sletmoen, Marit (Journal article; Peer reviewed, 2015)In this paper we demonstrate a procedure for preparing bacterial arrays that is fast, easy, and applicable in a standard molecular biology laboratory. Microcontact printing is used to deposit chemicals promoting bacterial ... -
Viability and properties of roll-to-roll coating of cellulose nanofibrils on recycled paperboard
Ottesen, Vegar; Kumar, Vinay; Toivakka, Martti; Chinga-Carrasco, Gary; Syverud, Kristin; Gregersen, Øyvind Weiby (Journal article; Peer reviewed, 2017)Cellulose nanofibrils (CNF) are, due in large part to excellent gas barrier properties, a potential environmentally friendly alternative to inorganic and petrochemical coatings of e.g. paperboard in packaging applications. ...