Dec, 2003
Structural anomalies of Rb and Br ionic nanosolutions in hydrophobic slit-shaped solid space as revealed by the EXAFS technique
JOURNAL OF PHYSICAL CHEMISTRY B
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- Volume
- 107
- Number
- 49
- First page
- 13616
- Last page
- 13622
- Language
- English
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.1021/jp0343685
- Publisher
- AMER CHEMICAL SOC
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.
- Link information
- ID information
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- DOI : 10.1021/jp0343685
- ISSN : 1520-6106
- ORCID - Put Code : 32866610
- Web of Science ID : WOS:000187009700013