Spin-polarized [sup 129]Xe NMR study of a polymer surface
- Lawrence Berkeley Lab., CA (United States)
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 [sup 129]Xe 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 [sup 129]Xe shift, the diffusion coefficient of xenon on poly(acrylic acid) is estimated to be 3.3 [times] 10[sup [minus]5] cm[sup 2]/s. 35 refs., 10 figs., 1 tab.
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6234963
- Journal Information:
- Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 97:8; ISSN JPCHAX; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360606 -- Other Materials-- Physical Properties-- (1992-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400500 -- Photochemistry
ADSORPTION
DAYS LIVING RADIOISOTOPES
DIFFUSION
ELECTROMAGNETIC RADIATION
EVEN-ODD NUCLEI
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LASER RADIATION
MAGNETIC RESONANCE
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYMERS
PRESSURE DEPENDENCE
RADIATIONS
RADIOISOTOPES
RESONANCE
SORPTION
STABLE ISOTOPES
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
XENON 129
XENON ISOTOPES