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Effect of temperature and a weakly polar organic medium on water localization in slit-like pores of various sizes in microporous activated carbon

  • Physical Chemistry of Surface Phenomena
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Abstract

The joint adsorption of water and methane in pores of the synthetic carbon adsorbent with specific surface area of 3463 m2/g was studied by 1H NMR spectroscopy. It was shown that during adsorption of water and methane in pores of activated carbon AC86 under conditions of low surface filling the adsorbate molecules are localized not only in micropores, but in mesopores as well, and are revealed in the spectra as several signals with different values of the chemical shift. A substantial drop in the magnetic shielding effect of the carbon surface was detected upon a reduction in temperature; this is explained by the presence of two energy minima on the curves of the adsorption potential energy (close to the walls and in the center of pores) and allows the migration of adsorbed molecules from the walls to the center of pores, which are characterized by a lower shielding effect.

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Authors and Affiliations

  1. Chuiko Institute of Surface Chemistry, Kiev, 03164, Ukraine

    V. V. Turov & V. M. Gun’ko

  2. School of Pharmacy and Biomolecular Sciences, University of Brighton, Brighton, BN2 4GJ, UK

    V. M. Gun’ko & S. V. Mikhalovskii

  3. MAST Carbon International Ltd., Henley Park, Guildford, Surrey, GU3 2AF, UK

    O. P. Kozynchenko & S. R. Tennison

Authors
  1. V. V. Turov
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  2. V. M. Gun’ko
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  3. O. P. Kozynchenko
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  4. S. R. Tennison
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  5. S. V. Mikhalovskii
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Correspondence to V. V. Turov.

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Original Russian Text © V.V. Turov, V.M. Gun’ko, O.P. Kozynchenko, S.R. Tennison, S.V. Mikhalovskii, 2011, published in Zhurnal Fizicheskoi Khimii, 2011, Vol. 85, No. 11, pp. 2094–2099.

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Turov, V.V., Gun’ko, V.M., Kozynchenko, O.P. et al. Effect of temperature and a weakly polar organic medium on water localization in slit-like pores of various sizes in microporous activated carbon. Russ. J. Phys. Chem. 85, 1954–1959 (2011). https://doi.org/10.1134/S0036024411110318

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  • DOI: https://doi.org/10.1134/S0036024411110318

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