Dispersibility of freeze-drying unmodified and modified TEMPO-oxidized cellulose nanofibrils in organic solvents
https://doi.org/10.17586/2220-8054-2021-12-6-763-772
Abstract
Cellulose nanofibrils (TOCNF) with a width of 20±6 nm and a length of 809±98 nm were prepared using 2,2,6,6-tetramethylpiperidinyl-1oxyl (TEMPO)-mediated oxidation. Two modifying agents were used to functionalize the TOCNF surface in aqueous media: alkyl ketene dimer (AKD) and 3-aminopropyltriethoxysilane (APS). The hydrophilic aerogel L-TOCNF, hydrophobic aerogels L-TOCNF-AKD and L-TOCNF-APS with water contact angles of 0, 139±2, and 133±2◦, respectively, were prepared by freeze-drying of the aqueous dispersions. The elemental composition, morphology, sizes and crystal structure were determined by EDX analysis, scanning electron microscopy and X-ray diffraction, respectively. The process of redispersion of lyophilized samples in water and four organic solvents was investigated. The effect of TOCNF modification and solvent polarity on the redispersibility of lyophilized samples was revealed: the dispersibility of hydrophobic L-TOCNF-AKD and L-TOCNF-APS in organic solvents was significantly improved.
Keywords
Supporting agencies: This work was supported by the Ministry of Science and Higher Education within the State assignment to Prokhorov General Physics Institute of the Russian Academy of Sciences. Authors express their sincere gratitude to Dr. Arthur I. Popov for his most kind assistance in the preparation of the present manuscript, Dr. Radmir V. Gainutdinov for the study of Atomic Force Microscopy, Dr. Khursand Yorov for freeze-drying and Dr. Vladimir N. Kuryakov for zeta potential measurements.
About the Authors
A. A. Luginina
Prokhorov General Physics Institute of the Russian Academy of Sciences
Russian Federation
Russian Federation
38, Vavilov Street, Moscow 119991.
S. V. Kuznetsov
Prokhorov General Physics Institute of the Russian Academy of Sciences
Russian Federation
Russian Federation
38, Vavilov Street, Moscow 119991.
V. K. Ivanov
Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences
Russian Federation
Russian Federation
31, Leninsky Prospect, Moscow 119991.
V. V. Voronov
Prokhorov General Physics Institute of the Russian Academy of Sciences
Russian Federation
Russian Federation
38, Vavilov Street, Moscow 119991.
A. D. Yapryntsev
Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences
Russian Federation
Russian Federation
31, Leninsky Prospect, Moscow 119991.
D. I. Petukhov
Lomonosov Moscow State University, Chemical department
Russian Federation
Russian Federation
1-3, Leninskie Gory, Moscow, 119991.
S. Yu. Kottsov
Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences
Russian Federation
Russian Federation
31, Leninsky Prospect, Moscow 119991.
E. V. Chernova
Prokhorov General Physics Institute of the Russian Academy of Sciences
Russian Federation
Russian Federation
38, Vavilov Street, Moscow 119991.
P. P. Fedorov
Prokhorov General Physics Institute of the Russian Academy of Sciences
Russian Federation
Russian Federation
38, Vavilov Street, Moscow 119991.
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Review
For citations:
Luginina A.A., Kuznetsov S.V., Ivanov V.K., Voronov V.V., Yapryntsev A.D., Petukhov D.I., Kottsov S.Yu., Chernova E.V., Fedorov P.P. Dispersibility of freeze-drying unmodified and modified TEMPO-oxidized cellulose nanofibrils in organic solvents. Nanosystems: Physics, Chemistry, Mathematics. 2021;12(6):763-772. https://doi.org/10.17586/2220-8054-2021-12-6-763-772
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