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Solid State Nucl Magn Reson. 2006 Feb;29(1-3):85-9. Epub 2005 Oct 27.

Analysis of porosity in porous silicon using hyperpolarized 129Xe two-dimensional exchange experiments.

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H.C. Brown Laboratory, Department of Chemistry, 560 Oval Drive, Purdue University, West Lafayette, IN 47907, USA.


The porosity in porous silicon was characterized using hyperpolarized (HP) xenon as a probe. HP xenon under conditions of continuous flow allows for the rapid acquisition of xenon NMR spectra that can be used to characterize a variety of materials. Two-dimensional exchange spectroscopy (EXSY) (129)Xe NMR experiments using HP xenon were performed to obtain exchange pathways and rates of xenon mobility between pores of different dimensions within the structure of porous silicon and to the gas phase above the sample. Pore sizes are estimated from chemical shift information and a model for pore geometry is presented.

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