Nuclear magnetic relaxation dispersion measurement of water mobility at a silica surface

Carl F. Polnaszek, Douglas A. Hanggi, Peter W. Carr, Robert G. Bryant

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Nuclear magnetic relaxation rates are measured as a function of magnetic field strength corresponding to proton Larmor frequencies ranging from 0.01 to 42 MHz for silica gel samples with a nitroxide free radical covalently attached at the surface. The field dependence of the relaxation rate is interpreted using a translational model for the relaxation equation to yield a translational diffusion coefficient for the water, in the immediate vicinity of the radical attached to the surface, of 2.1 × 10-6 cm2 s-1 at 278 K for Si-4000 silica.

Original languageEnglish (US)
Pages (from-to)311-315
Number of pages5
JournalAnalytica Chimica Acta
Volume194
Issue numberC
DOIs
StatePublished - 1987

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