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Issue 28, 2008
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Revealing complex formation in acetonen-alkane mixtures by MAS PFG NMR diffusion measurement in nanoporous hosts

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Abstract

Magic-angle spinning pulsed field gradient nuclear magnetic resonance (MAS PFG NMR) was applied for selective self-diffusion measurements of acetonen-alkane (C6 up to C9) mixtures in nanoporous silica gel. Two specimens of silica gel with mean pore sizes of about 4 and 10 nm are considered. In the smaller pores, the n-alkane diffusivities are by about one and the acetone diffusivities by about two orders of magnitude smaller than in the larger pores. In addition, the acetone diffusivities in the narrow-pore specimen exhibit a pronounced oscillation with increasing chain length of the solventn-alkanes: the diffusivities of acetone dissolved in odd-carbon number n-alkanes exceed those of acetone dissolved in even-carbon number n-alkanes by about 50%! These findings reproduce the tendencies observed in previous macroscopic release studies (Phys. Chem. Chem. Phys. 2003, 5, 2476) and suggest the formation of acetonen-alkane complex-like assemblages in the narrow-pore silica gel.

Graphical abstract: Revealing complex formation in acetone–n-alkane mixtures by MAS PFG NMR diffusion measurement in nanoporous hosts

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Publication details

The article was received on 20 Feb 2008, accepted on 21 Apr 2008 and first published on 05 Jun 2008


Article type: Paper
DOI: 10.1039/B802929F
Phys. Chem. Chem. Phys., 2008,10, 4165-4171

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    Revealing complex formation in acetonen-alkane mixtures by MAS PFG NMR diffusion measurement in nanoporous hosts

    M. Fernandez, A. Pampel, R. Takahashi, S. Sato, D. Freude and J. Kärger, Phys. Chem. Chem. Phys., 2008, 10, 4165
    DOI: 10.1039/B802929F

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