Specific intermolecular structures of gases confined in carbon nanospace

Kaneko, Katsumi

doi:10.1016/s0008-6223(99)00183-9

Cited by 55 publications

(36 citation statements)

References 77 publications

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“…However, the residual space between the monolayers on the pore walls can also offer an enhanced interaction potential for molecules (Ohba et al, 2000) and thereby the term of solid nanospaces has been used even for pores whose pore width is larger than the bilayer thickness of the molecule. Kaneko et al have been studying molecular assemblies in carbon nanopores, showing that molecules form a self-organized molecular assembly depending on the molecule-pore wall interaction (Kaneko, 2000). Accordingly, if we can understand and control the unique nature of nanospaces, we can develop new chemistry and chemical engineering.…”

Section: Introductionmentioning

confidence: 99%

Nanospace Molecular Science and Adsorption

Kaneko¹,

Ohba²,

Ohkubo³

et al. 2005

Adsorption

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The relationships between the enhanced interaction potential and intensive confinement effect of slit-shaped and cylindrical nanospaces are shown. The structures of water molecules and aqueous ions confined in nanospaces of activated carbon fiber (ACF) and single wall carbon nanohorn (SWNH)s were studied by adsorption, in situ small angle X-ray scattering(SAXS), GCMC simulation, and EXAFS spectroscopy. Water molecules are associated with each other to form the clusters, being stabilized in the carbon nanospaces. This stabilization mechanism of water in carbon nanospaces were evidenced by the interaction potential calculation, GCMC simulation, and the density fluctuation analysis of in situ SAXS. The Ornstein-Zernike analysis of in situ SAXS profiles lead to the conclusion that the critical size of water clusters for predominant water adsorption in hydrophobic carbon nanospaces is about 0.5 nm corresponding to the octomer to decamer. The adsorption hysteresis of water adsorption isotherm of nanoporous carbon was interpreted by the cluster growth, which is confirmed by the density fluctuation analysis. The Rb and Br ions confined in the carbon nanospaces were examined by EXAFS spectroscopy. The remarkable decreases in the hydration number and the water-Rb ion distance of the solution confined in the nanospaces were observed. In particular, the hydration number of the Rb ion in the nanospaces of SWNH is less than 3, being much smaller than the hydration number (6) of the bulk solution. The electrical double layer structure in the nanospaces should be quite different from that in the bulk solution.

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Section: Introductionmentioning

confidence: 99%

Nanospace Molecular Science and Adsorption

Kaneko¹,

Ohba²,

Ohkubo³

et al. 2005

Adsorption

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“…Recent theoretical studies using ACFs as model materials reported formation of some peculiar molecular aggregates such as SO 2 [8,9], H 2 O [10], CCl 4 [11,12], etc. [13], in carbon nanopore spaces. These new phenomena may find not only theoretical meaning but also a possible technical application to catalysis, adsorption, gas storage, etc.…”

Section: Introductionmentioning

confidence: 99%

Air oxidation effects on microporosity, surface property, and CH4 adsorptivity of pitch-based activated carbon fibers

Wang

Yamashita

Hoshinoo

et al. 2004

Journal of Colloid and Interface Science

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“…With further decreasing pore size the potential fields from the opposite walls coalesce into a unified symmetric potential energy curve with maximum peak along the pore axis and no local maxima [76,77] as shown in case b2 in Fig. 1.…”

Section: Theoretical Backgroundmentioning

confidence: 86%