Characterization of porous glass by adsorption of dibromomethane in conjunction with small-angle x-ray scattering (Journal article)

Mitropoulos, A.Ch.Haynes, J.M.Richardson, R.M.Kanellopoulos, N.K.


 Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/7305
Two porous glass samples of the Vycor type, one in a monolithic form and the other as a fine powder, were examined by the method of small-angle x-ray scattering (SAXS). Adsorption isotherms of dibromomethane (CH2Br2) were measured on the same samples, and analyzed according to the Kelvin equation. The SAXS measurements were repeated on samples that had been brought to equilibrium with known relative pressures (p/p0) of CH2Br2, which has a similar electron density as Vycor. Analysis of the data, in terms of fractal geometry, was also accomplished. The fractal dimension for the dry samples was estimated to be 2.5±0.1. Furthermore, as the adsorbate loading was increased defractalization was observed. Subsequently, the fractality in Vycor was estimated to have an upper cutoff limit equal to 15. A correlation between the two methods was demonstrated, by reconstructing the adsorption isotherm from the SAXS data, in two ways: first, by plotting the scattering intensities against p/p0 and second by plotting the Porod slopes against p/p0. © 1995 The American Physical Society.
Institution and School/Department of submitter: Δεν υπάρχει πληροφορία
Keywords: X-ray;Dibromomethane
URI: http://hdl.handle.net/123456789/7305
Publisher: Δεν υπάρχει πληροφορία
Item type: journalArticle
General Description / Additional Comments: Volume 52, Issue 14, pp. 10035-10042
http://www.scopus.com/inward/record.url?eid=2-s2.0-0000040591&partnerID=40&md5=823def9af2f857f051045d2faa26bc2e
School of Chemistry, University of Bristol, Cantock's Close, BS8 1TS Bristol, United Kingdom
National Centre for Scientific Research Demokritos, Institute of Physical Chemistry, 153 10 Aghia Paraskevi Attikis, Greece
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Item language: en
Item access scheme: free
Institution and School/Department of submitter: Δεν υπάρχει πληροφορία
Publication date: 1995
Bibliographic citation: Δεν υπάρχει πληροφορία
Abstract: Two porous glass samples of the Vycor type, one in a monolithic form and the other as a fine powder, were examined by the method of small-angle x-ray scattering (SAXS). Adsorption isotherms of dibromomethane (CH2Br2) were measured on the same samples, and analyzed according to the Kelvin equation. The SAXS measurements were repeated on samples that had been brought to equilibrium with known relative pressures (p/p0) of CH2Br2, which has a similar electron density as Vycor. Analysis of the data, in terms of fractal geometry, was also accomplished. The fractal dimension for the dry samples was estimated to be 2.5±0.1. Furthermore, as the adsorbate loading was increased defractalization was observed. Subsequently, the fractality in Vycor was estimated to have an upper cutoff limit equal to 15. A correlation between the two methods was demonstrated, by reconstructing the adsorption isotherm from the SAXS data, in two ways: first, by plotting the scattering intensities against p/p0 and second by plotting the Porod slopes against p/p0. © 1995 The American Physical Society.
Publisher: Δεν υπάρχει πληροφορία
Journal name: Physical Review B
Journal type: peer-reviewed
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