@article {445,
	title = {Xenon Nmr-Study of a Nematic Liquid-Crystal Confined to Cylindrical Submicron Cavities},
	journal = {Journal of Physical Chemistry},
	volume = {99},
	year = {1995},
	note = {J Phys Chem-UsRm901Times Cited:17Cited References Count:37},
	month = {Aug 3},
	pages = {11989-11993},
	abstract = {<p>NMR studies of xenon gas dissolved in the liquid crystal ZLI 1132 confined to submicron cylindrical cavities are reported. Spectra taken as a function of temperature yield a clear indication of the nematic to isotropic phase transition of the confined liquid crystals. In the nematic phase at 21 degrees C, the resonance line of dissolved Xe-129 exhibits a chemical shift anisotropy of 15 ppm due to a random distribution of director axes in the plane perpendicular to the long axis of the cylinder. The anisotropy and temperature dependence of the confined system are compared to control experiments that use the bulk liquid crystal. The quadrupolar splitting observed in the Xe-131 NMR spectrum of the confined liquid crystalline solution of xenon gas is slightly greater than that found in the bulk. Two-dimensional exchange NMR demonstrates that the xenon atoms probe different average liquid crystal directors within a single cavity on a 20 ms time scale and that interpore exchange occurs on a time scale of 400 ms. The exchange data indicate that changes in the orientation of the director within individual cavities occur on a length scale of about 2 mu m.</p>
},
	keywords = {mixtures},
	isbn = {0022-3654},
	doi = {Doi 10.1021/J100031a029},
	url = {<Go to ISI>://WOS:A1995RM90100029},
	author = {Long, H. W. and Luzar, M. and Gaede, H. C. and Larsen, R. G. and Kritzenberger, J. and Pines, A. and Crawford, G. P.}
}
@article {462,
	title = {Xe-129 Nmr-Study of Tio2 (Anatase)-Supported V2o5 Catalysts},
	journal = {Journal of Physical Chemistry},
	volume = {98},
	year = {1994},
	note = {J Phys Chem-UsPk740Times Cited:19Cited References Count:61},
	month = {Oct 6},
	pages = {10173-10179},
	abstract = {<p>TiO2 (anatase), V2O5, and V2O5/TiO2 (anatase) catalysts with 1.3\%, 3.0\%, and 9.8\% weight loadings of V2O5 have been studied using temperature-dependent xenon-129 NMR spectroscopy. The intrinsic chemical shift values due to the interaction of xenon with the surface are 109 +/- 3 ppm for TiO2 (anatase) and 93 +/- 5 ppm for V2O5. The V2O5/TiO2 catalysts provide strong adsorption sites for xenon which cause an initial decrease of the chemical shift values at low xenon loadings. Additionally, the spectra of pure V2O5 reveal two distinct environments for the xenon atoms, consistent with the hysteresis of the isotherm and the existence of pores. Two-dimensional exchange spectroscopy was used to measure the rates and activation energy of xenon moving between these two environments.</p>
},
	keywords = {nay zeolite},
	isbn = {0022-3654},
	doi = {Doi 10.1021/J100091a037},
	url = {<Go to ISI>://WOS:A1994PK74000037},
	author = {Kritzenberger, J. and Gaede, H. C. and Shore, J. S. and Pines, A. and Bell, A. T.}
}
