²H-NMR study of molecular reorientation of D₂O confined into the slit-shaped micropores of activated carbon fiber

Asada, Takumi; Iwatsuki, Rin; Iiyama, Taku et al.

Adsorption, 2024, 30, 95-106

Number of Access:320（2025-07-08 15:25 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/93548

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Title
²H-NMR study of molecular reorientation of D₂O confined into the slit-shaped micropores of activated carbon fiber
Creator
CreatorName
Asada, Takumi
CreatorName
Iwatsuki, Rin
NRID
1000030313828 1000030313828
CreatorName
Iiyama, Taku
NRID
1000070294155 1000070294155
researchmap permalink
Takahiro_ueda Takahiro_ueda
Scopus Author ID
7403982331 7403982331
CreatorName
Ueda, Takahiro
Subject
Hydrogen bond
Micropore filling
NMR
Reorientation
Spin–lattice relaxation time
Water adsorption
Description
The version of record of this article, first published in Adsorption, is available online at Publisher’s website: https://doi.org/10.1007/s10450-023-00433-8
Abstract
Herein, the reorientation of heavy water (D2O) molecules adsorbed in the slit-type micropores of activated carbon fibers is investigated using the 2H-nuclear magnetic resonance technique. The rotational correlation times (τ c) of D2O are evaluated from the 2H spin–lattice relaxation time (T 1). The obtained τ c values are significantly influenced by both the pore-filling ratio (ϕ) and temperature, thus suggesting that the adsorption of D2O into activated carbon fibers (ACF) effectively influences the reorientation of the D2O molecules within the ACF. The reorientational motion of D2O is examined by the extended jump model. According to this model, the nanoconfinement effect, which results from the reduction in free volume around D2O, is attributed to the transition-state excluded volume effect, whereas the effect of hydrogen bonding between the D2O and surface functional groups is attributed to the transition-state hydrogen bonding effects. Furthermore, the dependence of τ c on ϕ is explained by the chemical exchange between the pore surface adsorption sites and the central space of the pore. Thus, the dynamic behavior of adsorbed D2O molecules reveals the mechanism of D2O adsorption into the ACF micropores.
Publisher
Springer
Source Title
Adsorption
Volume (Issue)
30
Page
95-106
Date of Issued
2024-01-05
Language
English
Handle URL
https://hdl.handle.net/11094/93548
PISSN
09295607
eISSN
15728757
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1007/s10450-023-00433-8
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