Number of the records: 1  

Deconstruction of microfibrillated cellulose into nanocrystalline cellulose rods and mesogenic phase formation in concentrated low-modulus sodium silicate solutions

  1. 1.
    SYSNO ASEP0504757
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleDeconstruction of microfibrillated cellulose into nanocrystalline cellulose rods and mesogenic phase formation in concentrated low-modulus sodium silicate solutions
    Author(s) Bertolla, Luca (UFM-A)
    Dlouhý, Ivo (UFM-A) RID, ORCID
    Bartoníčková, E. (CZ)
    Toušek, J. (CZ)
    Nováček, J. (CZ)
    Mácová, Petra (UTAM-F) RID, SAI
    Number of authors6
    Source TitleCellulose - ISSN 0969-0239
    Roč. 26, č. 7 (2019), s. 4325-4344
    Number of pages20 s.
    Publication formPrint - P
    Languageeng - English
    CountryNL - Netherlands
    KeywordsMicrofibrillated cellulose ; Cellulose nanocrystal ; Sodium silicate
    Subject RIVJH - Ceramics, Fire-Resistant Materials and Glass
    OBOR OECDCeramics
    Subject RIV - cooperationInstitute of Theoretical and Applied Mechanics - Ceramics, Fire-Resistant Materials and Glass
    R&D ProjectsLQ1601 GA MŠk - Ministry of Education, Youth and Sports (MEYS)
    Institutional supportUFM-A - RVO:68081723 ; UTAM-F - RVO:68378297
    UT WOS000465576000008
    EID SCOPUS85064180245
    DOI10.1007/s10570-019-02364-6
    AnnotationThis work demonstrates for the first time the deconstruction of microfibrillated cellulose (MFC) into rod-like cellulose nanocrystals (CNCs) in concentrated low modulus sodium silicate solutions. To this aim, MFC suspensions at different concentrations were first treated in sodium hydroxide solutions and then amorphous silica powder was added. Optical microscopy and transmission electron microscopy observation showed how MFC was efficiently deconstructed into CNCs, evidencing the occurrence of a phase separation into an isotropic and mesogenic phase. The extracted CNCs were characterized by a remarkably higher length (600-1200nm) in comparison with the plant-derived ones commonly reported in literature. FT-IR spectroscopy and Si-29 MAS NMR confirmed that the Q(n) equilibrium of the suspended silicate species was affected, proportionally to the amount of MFC. It was also shown, that due to the excluded volume effect exerted by silicate anions, nematic or smectic ordering could be achieved for CNC concentrations far below the critical rod concentration predicted by the Doi-Edwards model.
    WorkplaceInstitute of Physics of Materials
    ContactYvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485
    Year of Publishing2020