Spin-Polarized Xe-129 Nmr-Study of a Polymer Surface

TitleSpin-Polarized Xe-129 Nmr-Study of a Polymer Surface
Publication TypeJournal Article
Year of Publication1993
AuthorsRaftery D., Reven L., Long H., Pines A, Tang P., Reimer J.A
JournalJournal of Physical Chemistry
Date PublishedFeb 25
ISBN Number0022-3654
Accession NumberWOS:A1993KP60300029

A method for NMR studies of low surface area materials using optically pumped xenon gas is described. The method has been used to investigate spin-polarized xenon adsorbed onto poly(acrylic acid). The temperature dependence of the xenon-surface interaction, as measured by the xenon chemical shifts extrapolated to zero pressure, is shown to be consistent with a simple model of chemical exchange between the gas and adsorbed phases. The magnitude of the surface contribution to the Xe-129 chemical shift indicates a relatively strong interaction between xenon and poly(acrylic acid), possibly due to the polar carboxylic acid functional groups at the polymer surface. From the pressure dependence of the Xe-129 shift, the diffusion coefficient of xenon on poly(acrylic acid) is estimated to be 3.3 x 10(-5) cm2/s.

URL<Go to ISI>://WOS:A1993KP60300029
Short TitleSpin-Polarized Xe-129 Nmr-Study of a Polymer Surface
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