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

Uetani, Kojiro; Izakura, Shogo; Kasuga, Takaaki; Koga, Hirotaka; Nogi, Masaya

doi:https://doi.org/10.3390/colloids2040071

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

アクセス数:700件（2025-08-16 00:02 集計）

固定URL: https://hdl.handle.net/11094/78447

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タイトル	Self-Alignment Sequence of Colloidal Cellulose Nanofibers Induced by Evaporation from Aqueous Suspensions
著者	NRID 1000020733306 1000020733306 著者名 Uetani, Kojiro
	著者名 Izakura, Shogo
	NRID 1000040915584 1000040915584 researchmap permalink tkasuga tkasuga 著者名 Kasuga, Takaaki
	NRID 1000030634539 1000030634539 ORCID 0000-0001-6295-1731 0000-0001-6295-1731 researchmap permalink hkoga hkoga Scopus Author ID 7201439917 7201439917 著者名 Koga, Hirotaka
	NRID 1000080379031 1000080379031 researchmap permalink read0151141 read0151141 Scopus Author ID 9846851200 9846851200 著者名 Nogi, Masaya
キーワード等	cellulose nanopaper
	evaporation–condensation
	hierarchical structure
	chiral nematic liquid crystal
	layered structure
内容	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.
抄録	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.
出版者	MDPI
収録物名	Colloids and Interfaces
巻(号)	2(4)
ページ	71
刊行年月	2018-12-12
言語	英語
ハンドルURL	https://hdl.handle.net/11094/78447
eISSN	25045377
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.3390/colloids2040071
アクセス権	open access
権利情報	© 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is licensed under a Creative Commons Attribution 4.0 International License.
出版タイプ	Version of Record
カテゴリ	学術雑誌論文 Journal Article

資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
DCMI資源タイプ	text
DCTERMS.bibliographicCitation	Colloids and Interfaces. 2018, 2(4), p. 71
DC.title	Self-Alignment Sequence of Colloidal Cellulose Nanofibers Induced by Evaporation from Aqueous Suspensions
DC.creator	Uetani, Kojiro
	Izakura, Shogo
	Kasuga, Takaaki
	Koga, Hirotaka
	Nogi, Masaya
DC.publisher	MDPI
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2018-12-12
DC.identifier	https://doi.org/10.3390/colloids2040071
DC.subject	cellulose nanopaper
	evaporation–condensation
	hierarchical structure
	chiral nematic liquid crystal
	layered structure
DC.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.
DCTERMS.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.
DC.rights	© 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	78447
citation_title	Self-Alignment Sequence of Colloidal Cellulose Nanofibers Induced by Evaporation from Aqueous Suspensions
citation_author	Uetani, Kojiro
	Izakura, Shogo
	Kasuga, Takaaki
	Koga, Hirotaka
	Nogi, Masaya
citation_publisher	MDPI
citation_language	英語
citation_date	2018-12-12
citation_journal_title	Colloids and Interfaces
citation_volume	2
citation_issue	4
citation_firstpage	71
citation_doi	https://doi.org/10.3390/colloids2040071
citation_public_url	https://hdl.handle.net/11094/78447

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

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