Publication result detail
Deconstruction of microfibrillated cellulose into nanocrystalline cellulose rods and mesogenic phase formation in concentrated low-modulus sodium silicate solutions
BERTOLLA, L.; DLOUHÝ, I.; BARTONÍČKOVÁ, E.; TOUŠEK, J.; NOVÁČEK, J.; MÁCOVÁ, P.
Original Title
Deconstruction of microfibrillated cellulose into nanocrystalline cellulose rods and mesogenic phase formation in concentrated low-modulus sodium silicate solutions
English Title
Deconstruction of microfibrillated cellulose into nanocrystalline cellulose rods and mesogenic phase formation in concentrated low-modulus sodium silicate solutions
Type
WoS Article
Original Abstract
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. [GRAPHICS] .
English abstract
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. [GRAPHICS] .
Keywords
Microfibrillated cellulose; Cellulose nanocrystal; Sodium silicate
Key words in English
Microfibrillated cellulose; Cellulose nanocrystal; Sodium silicate
Authors
BERTOLLA, L.; DLOUHÝ, I.; BARTONÍČKOVÁ, E.; TOUŠEK, J.; NOVÁČEK, J.; MÁCOVÁ, P.
RIV year
2020
Released
01.05.2019
Publisher
SPRINGER
Location
DORDRECHT
ISBN
0969-0239
Periodical
CELLULOSE
Volume
26
Number
7
State
Kingdom of the Netherlands
Pages from
4325
Pages to
4344
Pages count
20
URL
Full text in the Digital Library
BibTex
@article{BUT162028,
author="Luca {Bertolla} and Ivo {Dlouhý} and Eva {Bartoníčková} and Jaromír {Toušek} and Jiří {Nováček} and Petra {Mácová}",
title="Deconstruction of microfibrillated cellulose into nanocrystalline cellulose rods and mesogenic phase formation in concentrated low-modulus sodium silicate solutions",
journal="CELLULOSE",
year="2019",
volume="26",
number="7",
pages="4325--4344",
doi="10.1007/s10570-019-02364-6",
issn="0969-0239",
url="https://link.springer.com/article/10.1007/s10570-019-02364-6"
}