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Direct Observation of Bound Water on Cotton Surfaces by Atomic Force Microscopy and Atomic Force Microscopy-Infrared Spectroscopy

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Title: Direct Observation of Bound Water on Cotton Surfaces by Atomic Force Microscopy and Atomic Force Microscopy-Infrared Spectroscopy
Authors: Igarashi, Takako Browse this author
Hoshi, Masato Browse this author
Nakamura, Koichi Browse this author
Kaharu, Takeshi Browse this author
Murata, Ken-ichiro Browse this author →KAKEN DB
Issue Date: 20-Feb-2020
Publisher: American Chemical Society
Journal Title: Journal of physical chemistry c
Volume: 124
Issue: 7
Start Page: 4196
End Page: 4201
Publisher DOI: 10.1021/acs.jpcc.0c00423
Abstract: A wet cotton rag becomes stiff after natural drying. We propose a model for this hardening phenomenon, which explains that the stiffness of cotton is caused by a cross-linked network between single fibers, mediated by capillary adhesion of bound water on the surface of cellulose. Here, with the aid of atomic force microscopy and atomic force microscopy-infrared spectroscopy, we reveal the existence of the bound water on the surface of a cotton single fiber under naturally dried conditions. We also find that the hydrogen bonding state of the bound water is distinct from that of the bulk water. Two stretching modes of OH groups are clearly decoupled from each other, which arise from the effects of the air-water (hydrophobic) and water-cellulose (hydrophilic) interfaces. This suggests a possible link between the microscopic nature of the bound water and the macroscopic mechanical behavior of cotton fabrics.
Type: article
URI: http://hdl.handle.net/2115/77965
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 村田 憲一郎

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