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- 저자 : Pippinger, T. (검색결과 1 건)
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Gatta, G.D.,Scheidl, K.S.,Pippinger, T.,Skala, R.,Lee, Y.,Miletich, R. Elsevier 2015 Microporous and mesoporous materials Vol.206 No.-
The compressional behavior and the P-induced crystal-fluid interaction of a natural paulingite-K have been explored on the basis of in-situ single-crystal and powder X-ray diffraction, and in-situ single-crystal Raman spectroscopy with a diamond anvil cell and a series of diverse pressure-transmitting fluids (i.e., silicone-oil, methanol:ethanol=4:1, methanol:ethanol:water=16:3:1). No evidence of any phase transition was observed within the P-range investigated, independent on the used P-fluids. The compressional behavior of paulingite is significantly different in response to the different nature of the P-fluids. A drastically lower compressibility is observed when the zeolite is compressed in methanol:ethanol or, even more noticeably, in methanol:ethanol:water mix. We ascribe this phenomenon to the different crystal-fluid interaction at high pressure: (1) silicone-oil is a ''non-penetrating'' P-medium, because of its polymeric nature, whereas (2) methanol-ethanol and water are ''penetrating'' P-fluids. The P-induced penetration processes appear to be completely reversible on the basis of the X-ray diffraction data alone. The Raman spectra collected after the high-pressure experiments show, unambiguously, that a residual fraction of methanol (and/or ethanol and probably even extra H<SUB>2</SUB>O) still resides in the zeolitic sub-nanocavities; such molecules are spontaneously released after a few days at atmospheric pressure. The actual compressibility of paulingite-K is that obtained by the compression experiment in silicone-oil, with an isothermal bulk modulus K<SUB>0</SUB>=β<SUB>0</SUB><SUP>-1</SUP>=18.0(1.1)GPa. Paulingite appears to be one of the softest zeolite ever found.
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