US EPA

1468618 

Journal Article 

Xenon porometry at room temperature 

Telkki, VV; Lounila, J; Jokisaari, J 

2006 

Yes 

Journal of Chemical Physics
ISSN: 0021-9606
EISSN: 1089-7690 

124 

3 

034711 

English 

16438604 

10.1063/1.2161212 

WOS:000234757400045 

http://://WOS:000234757400045
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Xenon porometry is a method in which porous material is immersed in a medium and the properties of the material are studied by means of 129Xe nuclear magnetic resonance (NMR) of xenon gas dissolved in the medium. For instance, the chemical shift of a particular signal (referred to as signal D) arising from xenon inside small pockets formed in the pores during the freezing of the confined medium is highly sensitive to the pore size. In the present study, we show that when naphthalene is used as the medium the pore size distribution of the material can be determined by measuring a single one-dimensional spectrum near room temperature and converting the chemical shift scale of signal D to the pore radius scale by using an experimentally determined correlation. A model has been developed that explains the curious behavior of the chemical shift of signal D as a function of pore radius. The other signals of the spectra measured at different temperatures have also been identified, and the influence of xenon pressure on the spectra has been studied. For comparison, 129Xe NMR spectra of pure xenon gas adsorbed to porous materials have been measured and analyzed.