Počet záznamů: 1  

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

  1. 1.
    SYSNO ASEP0504757
    Druh ASEPJ - Článek v odborném periodiku
    Zařazení RIVJ - Článek v odborném periodiku
    Poddruh JČlánek ve WOS
    NázevDeconstruction of microfibrillated cellulose into nanocrystalline cellulose rods and mesogenic phase formation in concentrated low-modulus sodium silicate solutions
    Tvůrce(i) 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
    Celkový počet autorů6
    Zdroj.dok.Cellulose - ISSN 0969-0239
    Roč. 26, č. 7 (2019), s. 4325-4344
    Poč.str.20 s.
    Forma vydáníTištěná - P
    Jazyk dok.eng - angličtina
    Země vyd.NL - Nizozemsko
    Klíč. slovaMicrofibrillated cellulose ; Cellulose nanocrystal ; Sodium silicate
    Vědní obor RIVJH - Keramika, žáruvzdorné materiály a skla
    Obor OECDCeramics
    Vědní obor RIV – spolupráceÚstav teoretické a aplikované mechaniky - Keramika, žáruvzdorné materiály a skla
    CEPLQ1601 GA MŠk - Ministerstvo školství, mládeže a tělovýchovy
    Institucionální podporaUFM-A - RVO:68081723 ; UTAM-F - RVO:68378297
    UT WOS000465576000008
    EID SCOPUS85064180245
    DOI10.1007/s10570-019-02364-6
    AnotaceThis 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.
    PracovištěÚstav fyziky materiálu
    KontaktYvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485
    Rok sběru2020