Self-Alignment Sequence of Colloidal Cellulose Nanofibers Induced by Evaporation from Aqueous Suspensions

Uetani, Kojiro; Izakura, Shogo; Kasuga, Takaaki et al.

Colloids and Interfaces, 2018, 2(4), 71

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Identifier to cite or link to this item: https://hdl.handle.net/11094/78447

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Title
Self-Alignment Sequence of Colloidal Cellulose Nanofibers Induced by Evaporation from Aqueous Suspensions
Creator
NRID
1000020733306 1000020733306
CreatorName
Uetani, Kojiro
CreatorName
Izakura, Shogo
NRID
1000040915584 1000040915584
researchmap permalink
tkasuga tkasuga
CreatorName
Kasuga, Takaaki
NRID
1000030634539 1000030634539
ORCID
0000-0001-6295-1731 0000-0001-6295-1731
researchmap permalink
hkoga hkoga
Scopus Author ID
7201439917 7201439917
CreatorName
Koga, Hirotaka
NRID
1000080379031 1000080379031
researchmap permalink
read0151141 read0151141
Scopus Author ID
9846851200 9846851200
CreatorName
Nogi, Masaya
Subject
cellulose nanopaper
evaporation–condensation
hierarchical structure
chiral nematic liquid crystal
layered structure
Description
Uetani, K.; Izakura, S.; Kasuga, T.; Koga, H.; Nogi, M. Self-Alignment Sequence of Colloidal Cellulose Nanofibers Induced by Evaporation from Aqueous Suspensions. Colloids Interfaces 2018, 2, 71. https://doi.org/10.3390/colloids2040071.
Abstract
Cellulose nanopapers fabricated by drying aqueous colloidal suspensions of cellulose nanofibers (CNFs) have characteristic hierarchic structures, which cause the problem that their optical properties, including their transparency or haze, vary due to the drying processes affecting CNF alignment. It is unclear when and how the colloidal CNFs align in the evaporation–condensation process from the randomly dispersed suspension to form the nanopaper. In this study, we found that the CNFs undergo a self-alignment sequence during the evaporation–condensation process to form chiral nematic nanopaper by observing the birefringence of the drying suspensions from both the top and side for two suspensions with different initial CNF concentrations. The layer structures of the CNFs first form on the surface by condensation of the suspension, owing to water evaporation from the surface. The thickness of the layered structure then increases and the CNFs begin to align within each layer plane, finally forming chiral nematic structures. A birefringence difference also occurs for dried nanopapers with similar transparency or haze because of the initial CNF concentration.
Publisher
MDPI
Source Title
Colloids and Interfaces
Volume (Issue)
2(4)
Page
71
Date of Issued
2018-12-12
Language
English
Handle URL
https://hdl.handle.net/11094/78447
eISSN
25045377
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.3390/colloids2040071
Access Rights
open access
CopyRight
© 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is licensed under a Creative Commons Attribution 4.0 International License.
oaire:version
Version of Record
Category
学術雑誌論文 Journal Article