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

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, ORCID}
Number of authors	6
Source Title	Cellulose. - : Springer - ISSN 0969-0239 Roč. 26, č. 7 (2019), s. 4325-4344
Number 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

Number of the records: 1