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  • 51.
    Syverud, Kristin
    et al.
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Pettersen, S.
    Draget, K.
    Chinga-Carrasco, Gary
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Controlling the elastic modulus of nanoengineered hydrogels by cross-linking cellulose nanofibrils2013Conference paper (Refereed)
  • 52.
    Syverud, Kristin
    et al.
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Xhanari, K.
    Chinga-Carrasco, Gary
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Yu, Y.
    Stenius, P.
    Films made of cellulose nanofibrils: surface modification by adsorption of a cationic surfactant and characterization by computer-assisted electron microscopy2011In: Journal of nanoparticle research, ISSN 1388-0764, E-ISSN 1572-896X, Vol. 13Article in journal (Refereed)
  • 53.
    Torstensen, Jonathan
    et al.
    Norwegian University of Science and Technology, Norway.
    Helberg, Ragne M. L.
    Norwegian University of Science and Technology, Norway.
    Deng, Liyuan
    Norwegian University of Science and Technology, Norway.
    Gregersen, Öyvind W.
    Norwegian University of Science and Technology, Norway.
    Syverud, Kristin
    RISE - Research Institutes of Sweden, Bioeconomy, PFI. Norwegian University of Science and Technology, Norway.
    PVA/nanocellulose nanocomposite membranes for CO2 separation from flue gas2019In: International Journal of Greenhouse Gas Control, ISSN 1750-5836, E-ISSN 1878-0148, Vol. 81, p. 93-102Article in journal (Refereed)
    Abstract [en]

    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 improve membrane performance. PVA/cellulose nanocrystals (CNC) nanocomposite membranes have the most promising performance, with increased CO2 permeance (127.8 ± 5.5 GPU) and increased CO2/N2 separation factor (39 ± 0.4) compared to PVA composite membranes, with permeance 105.5 ± 1.9 GPU and separation factor 36 ± 0.5. The performance of PVA/CNC membranes is similar compared to PVA/carbon nanotubes (CNTs) membranes shown earlier. Thus, CNTs can be replaced by CNC that is biodegradable and non-toxic. Investigating several different nanocellulose types reveal that a high nanocellulose charge and small nanocellulose particles are important nanocellulose traits that improve membrane performance. 

  • 54.
    Torstensen, Jonathan Ø
    et al.
    NTNU Norwegian University of Science and Technology, Norway.
    Johnsen, Per Olav
    RISE - Research Institutes of Sweden, Bioeconomy, PFI.
    Riis, Henrik
    University of Oslo, Norway.
    Spontak, Richard J.
    North Carolina State University, USA.
    Deng, Liyuan
    NTNU Norwegian University of Science and Technology, Norway.
    Gregersen, Öyvind
    NTNU Norwegian University of Science and Technology, Norway.
    Syverud, Kristin
    RISE - Research Institutes of Sweden, Bioeconomy, PFI. NTNU Norwegian University of Science and Technology, Norway.
    Preparation of cellulose nanofibrils for imaging purposes: comparison of liquid cryogens for rapid vitrification2018In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 25, no 8, p. 4269-4274Article in journal (Refereed)
    Abstract [en]

    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 as water is solidified prior to freeze-drying. In this study, we have examined the morphologies of CNF suspensions prepared by rapid vitrification in two different liquid cryogens—nitrogen and ethane—followed by freeze-drying. Results obtained by scanning electron microscopy confirm that vitrification in liquid ethane not only greatly improves the survivability of fine-scale CNF structural elements but also significantly reduces the propensity for CNF to agglomerate.

  • 55.
    Torstensen, Jonathan Ø
    et al.
    NTNU Norwegian University of Science and Technology, Norway.
    Liu, Ming
    North Carolina State University, USA.
    Jin, Soo-Ah
    North Carolina State University, USA.
    Deng, Liyuan
    NTNU Norwegian University of Science and Technology, Norway.
    Hawari, Ayman I
    North Carolina State University, USA.
    Syverud, Kristin
    RISE - Research Institutes of Sweden, Bioeconomy, PFI. NTNU Norwegian University of Science and Technology, Norway.
    Spontak, Richard J
    North Carolina State University, USA.
    Gregersen, Øyvind W
    NTNU Norwegian University of Science and Technology, Norway.
    Swelling and Free-Volume Characteristics of TEMPO-Oxidized Cellulose Nanofibril Films.2018In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 19, no 3, p. 1016-1025Article in journal (Refereed)
    Abstract [en]

    Cellulose nanofibrils (CNFs) are becoming increasingly ubiquitous in diverse technologies requiring sustainable nanoscale species to form or modify films. The objective of the present study is to investigate the swelling behavior and accompanying free volume of self-standing TEMPO-oxidized (TO) CNF films in the presence of water vapor. For this purpose, we have performed time-resolved swelling experiments on films, prepared according to different experimental protocols, at 90% relative humidity (RH) and ambient temperature. Corresponding free-volume characteristics are elucidated by positron annihilation lifetime spectroscopy (PALS) conducted at ambient temperature and several RH levels. Increasing the drying temperature of the films (from ambient to 50 °C) is observed to promote an increase in film density, which serves to reduce bulk swelling. These elevated drying temperatures likewise cause the free-volume pore size measured by PALS to decrease, while the corresponding total free-volume fraction remains nearly constant. Similarly, dispersion of TO-CNF into aqueous suspensions by ultrasonication prior to film formation increases both the total free-volume fraction and pore size but reduces the size of individual nanofibrils with little net change in bulk swelling. The swelling and concurrent free-volume measurements reported here generally reveal an increase in the free volume of TO-CNF films with increasing RH.

  • 56.
    Wernersson Brodin, F.
    et al.
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Weiby Gregersen, Ø
    NTNU Norwegian University of Science and Technology, Norway.
    Syverud, Kristin
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Cellulose nanofibrils: Challenges and possibilities as a paper additive or coating material – A review2014In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 1, no 29, p. 156-166Article in journal (Refereed)
  • 57. Xhanari, K.
    et al.
    Syverud, Kristin
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Chinga-Carrasco, Gary
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Paso, K.
    Stenius, P.
    Reduction of water wettability of nanofibrillated cellulose by adsorption of cationic surfactants2011In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 18Article in journal (Refereed)
  • 58. Xhanari, K.
    et al.
    Syverud, Kristin
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Chinga-Carrasco, Gary
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Paso, K.
    Stenius, P.
    Structure of nanofibrillated cellulose layers at the o/w interface2011In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 356Article in journal (Refereed)
  • 59. Xhanari, K.
    et al.
    Syverud, Kristin
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Stenius, P.
    Emulsions stabilized by microfibrillated cellulose: The effect of hydrofobization, concentration and o/w-ratio2011In: Journal of Dispersion Science and Technology, ISSN 0193-2691, E-ISSN 1532-2351, Vol. 32Article in journal (Refereed)
12 51 - 59 of 59
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