Structural anomalies of Rb and Br ionic nanosolutions in hydrophobic slit-shaped solid space as revealed by the EXAFS technique

Takahiro Ohkubo, Yoshiyuki Hattori, Hirofumi Kanoh, Takehisa Konishi, Takashi Fujikawa, Katsumi Kaneko

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The hydration structure of RbBr electrolytic solutions confined in slit-shaped nanospaces of carbon was determined with the extended X-ray absorption fine structure (EXAFS) technique and related analysis. The nitrogen adsorption isotherms at 77 K were measured to evaluate the porosity of RbBr-deposited carbon samples. The EXAFS results indicate that the electrolytic solution confined in hydrophobic nanospaces has a restricted hydration structure depending on the average pore width of the nanospaces. Also the asymmetric-field effect of slit-pore geometry on the formation of unique hydration structures of ions in nanospaces was unveiled with the analysis of EXAFS spectra. A marked decrease of the hydration number around a Rb ion was observed in slit-shaped nanospaces, indicating the compressed hydration structure around a Rb ion restricted in slit-shaped nanospaces. The distorted hydration structure around a Br ion in the slit-shaped pore of 0.7 nm was formed to increase the hydration number, though partially dehydrated structure can be formed in a 1.1-nm pore. The cluster-mediated ordered structure of water molecules can play an important role in forming a dehydrated structure around a Br ion confined in the 1.1-nm pore.

Original languageEnglish
Pages (from-to)13616-13622
Number of pages7
JournalJournal of Physical Chemistry B
Volume107
Issue number49
Publication statusPublished - Dec 11 2003
Externally publishedYes

Fingerprint

X ray absorption
Hydration
slits
hydration
fine structure
anomalies
porosity
Ions
x rays
ions
Carbon
carbon
Adsorption isotherms
isotherms
Nitrogen
Porosity
nitrogen
Molecules
adsorption
Geometry

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Structural anomalies of Rb and Br ionic nanosolutions in hydrophobic slit-shaped solid space as revealed by the EXAFS technique. / Ohkubo, Takahiro; Hattori, Yoshiyuki; Kanoh, Hirofumi; Konishi, Takehisa; Fujikawa, Takashi; Kaneko, Katsumi.

In: Journal of Physical Chemistry B, Vol. 107, No. 49, 11.12.2003, p. 13616-13622.

Research output: Contribution to journalArticle

Ohkubo, Takahiro ; Hattori, Yoshiyuki ; Kanoh, Hirofumi ; Konishi, Takehisa ; Fujikawa, Takashi ; Kaneko, Katsumi. / Structural anomalies of Rb and Br ionic nanosolutions in hydrophobic slit-shaped solid space as revealed by the EXAFS technique. In: Journal of Physical Chemistry B. 2003 ; Vol. 107, No. 49. pp. 13616-13622.
@article{25ab7673a3964abd8e8c90875b4c11e0,
title = "Structural anomalies of Rb and Br ionic nanosolutions in hydrophobic slit-shaped solid space as revealed by the EXAFS technique",
abstract = "The hydration structure of RbBr electrolytic solutions confined in slit-shaped nanospaces of carbon was determined with the extended X-ray absorption fine structure (EXAFS) technique and related analysis. The nitrogen adsorption isotherms at 77 K were measured to evaluate the porosity of RbBr-deposited carbon samples. The EXAFS results indicate that the electrolytic solution confined in hydrophobic nanospaces has a restricted hydration structure depending on the average pore width of the nanospaces. Also the asymmetric-field effect of slit-pore geometry on the formation of unique hydration structures of ions in nanospaces was unveiled with the analysis of EXAFS spectra. A marked decrease of the hydration number around a Rb ion was observed in slit-shaped nanospaces, indicating the compressed hydration structure around a Rb ion restricted in slit-shaped nanospaces. The distorted hydration structure around a Br ion in the slit-shaped pore of 0.7 nm was formed to increase the hydration number, though partially dehydrated structure can be formed in a 1.1-nm pore. The cluster-mediated ordered structure of water molecules can play an important role in forming a dehydrated structure around a Br ion confined in the 1.1-nm pore.",
author = "Takahiro Ohkubo and Yoshiyuki Hattori and Hirofumi Kanoh and Takehisa Konishi and Takashi Fujikawa and Katsumi Kaneko",
year = "2003",
month = "12",
day = "11",
language = "English",
volume = "107",
pages = "13616--13622",
journal = "Journal of Physical Chemistry B Materials",
issn = "1520-6106",
publisher = "American Chemical Society",
number = "49",

}

TY - JOUR

T1 - Structural anomalies of Rb and Br ionic nanosolutions in hydrophobic slit-shaped solid space as revealed by the EXAFS technique

AU - Ohkubo, Takahiro

AU - Hattori, Yoshiyuki

AU - Kanoh, Hirofumi

AU - Konishi, Takehisa

AU - Fujikawa, Takashi

AU - Kaneko, Katsumi

PY - 2003/12/11

Y1 - 2003/12/11

N2 - The hydration structure of RbBr electrolytic solutions confined in slit-shaped nanospaces of carbon was determined with the extended X-ray absorption fine structure (EXAFS) technique and related analysis. The nitrogen adsorption isotherms at 77 K were measured to evaluate the porosity of RbBr-deposited carbon samples. The EXAFS results indicate that the electrolytic solution confined in hydrophobic nanospaces has a restricted hydration structure depending on the average pore width of the nanospaces. Also the asymmetric-field effect of slit-pore geometry on the formation of unique hydration structures of ions in nanospaces was unveiled with the analysis of EXAFS spectra. A marked decrease of the hydration number around a Rb ion was observed in slit-shaped nanospaces, indicating the compressed hydration structure around a Rb ion restricted in slit-shaped nanospaces. The distorted hydration structure around a Br ion in the slit-shaped pore of 0.7 nm was formed to increase the hydration number, though partially dehydrated structure can be formed in a 1.1-nm pore. The cluster-mediated ordered structure of water molecules can play an important role in forming a dehydrated structure around a Br ion confined in the 1.1-nm pore.

AB - The hydration structure of RbBr electrolytic solutions confined in slit-shaped nanospaces of carbon was determined with the extended X-ray absorption fine structure (EXAFS) technique and related analysis. The nitrogen adsorption isotherms at 77 K were measured to evaluate the porosity of RbBr-deposited carbon samples. The EXAFS results indicate that the electrolytic solution confined in hydrophobic nanospaces has a restricted hydration structure depending on the average pore width of the nanospaces. Also the asymmetric-field effect of slit-pore geometry on the formation of unique hydration structures of ions in nanospaces was unveiled with the analysis of EXAFS spectra. A marked decrease of the hydration number around a Rb ion was observed in slit-shaped nanospaces, indicating the compressed hydration structure around a Rb ion restricted in slit-shaped nanospaces. The distorted hydration structure around a Br ion in the slit-shaped pore of 0.7 nm was formed to increase the hydration number, though partially dehydrated structure can be formed in a 1.1-nm pore. The cluster-mediated ordered structure of water molecules can play an important role in forming a dehydrated structure around a Br ion confined in the 1.1-nm pore.

UR - http://www.scopus.com/inward/record.url?scp=0346255394&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0346255394&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0346255394

VL - 107

SP - 13616

EP - 13622

JO - Journal of Physical Chemistry B Materials

JF - Journal of Physical Chemistry B Materials

SN - 1520-6106

IS - 49

ER -