%0 Journal Article %J Journal of Physical Chemistry %D 1993 %T Spin-Polarized Xe-129 Nmr-Study of a Polymer Surface %A Raftery, D. %A Reven, L. %A Long, H. %A Pines, A. %A Tang, P. %A Reimer, J. A. %K temperature %X

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.

%B Journal of Physical Chemistry %V 97 %P 1649-1655 %8 Feb 25 %@ 0022-3654 %G English %U ://WOS:A1993KP60300029 %N 8 %M WOS:A1993KP60300029 %! Spin-Polarized Xe-129 Nmr-Study of a Polymer Surface %R Doi 10.1021/J100110a029