Mass Transport of Volatile Molecules in Porous Materials: Evaporation–Condensation Phenomena Described by NMR Diffusometry

The transport mechanism of benzene in chromatographic-grade porous silica gel (10 nm pore size, 5 μm sphere diameter) was described by pulsed-field gradient (PFG) high-resolution magic-angle spinning (HRMAS) NMR by measuring the molecular mobility in a series of samples with variable filling levels...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2011-09, Vol.115 (38), p.18776-18781
Main Authors: Carrara, Caroline, Pagès, Guilhem, Delaurent, Corinne, Viel, Stéphane, Caldarelli, Stefano
Format: Article
Language:English
Subjects:
C: Surfaces, Interfaces, Catalysis
Chemical Sciences
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Summary:The transport mechanism of benzene in chromatographic-grade porous silica gel (10 nm pore size, 5 μm sphere diameter) was described by pulsed-field gradient (PFG) high-resolution magic-angle spinning (HRMAS) NMR by measuring the molecular mobility in a series of samples with variable filling levels of the void volume. The relevance of vapor-phase diffusion for benzene, pure or dissolved in chloroform, was established, and it implies migration of benzene between silica particles through an evaporation–condensation mechanism.
ISSN:1932-7447
1932-7455
DOI:10.1021/jp2074607