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Deconstruction of microfibrillated cellulose into nanocrystalline cellulose rods and mesogenic phase formation in concentrated low-modulus sodium silicate solutions
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SYSNO ASEP 0504757 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Deconstruction of microfibrillated cellulose into nanocrystalline cellulose rods and mesogenic phase formation in concentrated low-modulus sodium silicate solutions Author(s) Bertolla, Luca (UFM-A) ORCID
Dlouhý, Ivo (UFM-A) RID, ORCID
Bartoníčková, E. (CZ)
Toušek, J. (CZ)
Nováček, J. (CZ)
Mácová, Petra (UTAM-F) RID, SAI, ORCIDNumber of authors 6 Source Title Cellulose. - : Springer - ISSN 0969-0239
Roč. 26, č. 7 (2019), s. 4325-4344Number of pages 20 s. Language eng - English Country NL - Netherlands Keywords Microfibrillated cellulose ; Cellulose nanocrystal ; Sodium silicate Subject RIV JH - Ceramics, Fire-Resistant Materials and Glass OECD category Ceramics Subject RIV - cooperation Institute of Theoretical and Applied Mechanics - Ceramics, Fire-Resistant Materials and Glass R&D Projects LQ1601 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support UFM-A - RVO:68081723 ; UTAM-F - RVO:68378297 UT WOS 000465576000008 EID SCOPUS 85064180245 DOI 10.1007/s10570-019-02364-6 Annotation This 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. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2020 Electronic address https://link.springer.com/article/10.1007/s10570-019-02364-6
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