Anisotropic Transparency of Alkali-Treated Wood

Yagyu, Hitomi; Murayama, Hiryu; Ishioka, Shun; Kasuga, Takaaki; Koga, Hirotaka; Horikawa, Yoshiki; Nogi, Masaya

doi:https://doi.org/10.1002/mame.202500389

Anisotropic Transparency of Alkali-Treated Wood

Yagyu, Hitomi; Murayama, Hiryu; Ishioka, Shun et al.

Macromolecular Materials and Engineering, 2026, 311(2), e00389

Number of Access:55（2026-04-28 23:29 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/104254

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Title	Anisotropic Transparency of Alkali-Treated Wood
Creator	researchmap permalink bgm bgm CreatorName Yagyu, Hitomi
	CreatorName Murayama, Hiryu
	NRID 1000040984745 1000040984745 ORCID 0000-0002-9207-3586 0000-0002-9207-3586 researchmap permalink ShunIshioka ShunIshioka Scopus Author ID 57215051087 57215051087 CreatorName Ishioka, Shun
	NRID 1000040915584 1000040915584 ORCID 0000-0002-3576-943X 0000-0002-3576-943X researchmap permalink tkasuga tkasuga Scopus Author ID 57200625503 57200625503 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 1000090637711 1000090637711 CreatorName Horikawa, Yoshiki
	NRID 1000080379031 1000080379031 researchmap permalink read0151141 read0151141 Scopus Author ID 9846851200 9846851200 CreatorName Nogi, Masaya
Subject	alkali treatment
	anisotropic structures
	cellulose microfibril skeleton
	delignification
	holocellulose
	transparent wood
Description	Yagyu H., Murayama H., Ishioka S., et al. Anisotropic Transparency of Alkali-Treated Wood. Macromolecular Materials and Engineering 311, e00389 (2026); https://doi.org/10.1002/mame.202500389.
Abstract	This study elucidates the mechanism by which alkali treatment enhances the transparency of delignified wood, with a focus on the cellulose microfibril skeleton. Following delignification, the resulting material remains translucent due to light scattering from preserved lumens. Subsequent potassium hydroxide (KOH) treatment further removes hemicellulose and exchanges carboxyl-group counterions, which collectively soften the cell walls. This process allows the cellulose microfibril skeleton to undergo greater densification during drying, thereby reducing light scattering and yielding a highly transparent material without the need for polymer impregnation. We discovered that the inherent anisotropic structure of the wood's skeleton causes differential swelling between tangential and radial sections. The tangential sections, with their lower swelling ratio, undergo a more complete collapse of cell lumens, leading to higher density and superior transparency compared to the radial sections. This optical anisotropy, a direct consequence of the cellulose microfibril arrangement, was also evident in transparent wood-polymer composites. These findings highlight the fundamental role of the wood's underlying structure in determining its optical properties.
Publisher	John Wiley and Sons Inc
Source Title	Macromolecular Materials and Engineering
Volume (Issue)	311(2)
Page	e00389
Date of Issued	2026-01-31
Language	English
Handle URL	https://hdl.handle.net/11094/104254
PISSN	14387492
eISSN	14392054
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.1002/mame.202500389
Access Rights	open access
CopyRight	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

Resource Type	journal article
Local Type	Journal Article
DCMI Type	Text
DCTERMS.bibliographicCitation	Macromolecular Materials and Engineering. 2026, 311(2), p. e00389
DC.title	Anisotropic Transparency of Alkali-Treated Wood
DC.creator	Yagyu, Hitomi
	Murayama, Hiryu
	Ishioka, Shun
	Kasuga, Takaaki
	Koga, Hirotaka
	Horikawa, Yoshiki
	Nogi, Masaya
DC.publisher	John Wiley and Sons Inc
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2026-01-31
DC.identifier	https://doi.org/10.1002/mame.202500389
DC.subject	alkali treatment
	anisotropic structures
	cellulose microfibril skeleton
	delignification
	holocellulose
	transparent wood
DC.description	Yagyu H., Murayama H., Ishioka S., et al. Anisotropic Transparency of Alkali-Treated Wood. Macromolecular Materials and Engineering 311, e00389 (2026); https://doi.org/10.1002/mame.202500389.
DCTERMS.abstract	This study elucidates the mechanism by which alkali treatment enhances the transparency of delignified wood, with a focus on the cellulose microfibril skeleton. Following delignification, the resulting material remains translucent due to light scattering from preserved lumens. Subsequent potassium hydroxide (KOH) treatment further removes hemicellulose and exchanges carboxyl-group counterions, which collectively soften the cell walls. This process allows the cellulose microfibril skeleton to undergo greater densification during drying, thereby reducing light scattering and yielding a highly transparent material without the need for polymer impregnation. We discovered that the inherent anisotropic structure of the wood's skeleton causes differential swelling between tangential and radial sections. The tangential sections, with their lower swelling ratio, undergo a more complete collapse of cell lumens, leading to higher density and superior transparency compared to the radial sections. This optical anisotropy, a direct consequence of the cellulose microfibril arrangement, was also evident in transparent wood-polymer composites. These findings highlight the fundamental role of the wood's underlying structure in determining its optical properties.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	104254
citation_title	Anisotropic Transparency of Alkali-Treated Wood
citation_author	Yagyu, Hitomi
	Murayama, Hiryu
	Ishioka, Shun
	Kasuga, Takaaki
	Koga, Hirotaka
	Horikawa, Yoshiki
	Nogi, Masaya
citation_publisher	John Wiley and Sons Inc
citation_language	English
citation_date	2026-01-31
citation_journal_title	Macromolecular Materials and Engineering
citation_volume	311
citation_issue	2
citation_firstpage	e00389
citation_doi	https://doi.org/10.1002/mame.202500389
citation_public_url	https://hdl.handle.net/11094/104254

Anisotropic Transparency of Alkali-Treated Wood

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