In situ small angle X-ray scattering and benzene adsorption on polymer-based carbon hollow fiber membranes (Conference presentation)

Favvas, E.P.Stefanopoulos, K.L.Papageorgiou, S.K.Mitropoulos, A.C.

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dc.contributor.authorFavvas, E.P.en
dc.contributor.authorStefanopoulos, K.L.en
dc.contributor.authorPapageorgiou, S.K.en
dc.contributor.authorMitropoulos, A.C.en
dc.rightsDefault License-
dc.subjectCarbon membranesen
dc.subjectForm factoren
dc.subjectIn situen
dc.subjectLamellar poreen
dc.titleIn situ small angle X-ray scattering and benzene adsorption on polymer-based carbon hollow fiber membranesen
heal.generalDescriptionVolume 19, Issue 2-Apr, pp. 225-233en
heal.generalDescriptionInstitute of Physical Chemistry, NCSR Demokritos, Ag. Paraskevi Attikis, 153 41 Athens, Greeceen
heal.generalDescriptionDepartment of Petroleum and Natural Gas Technology, Cavala Institute of Technology, Ag. Loukas, 65404 Cavala, Greeceen
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heal.bibliographicCitationΔεν υπάρχει πληροφορίαel
heal.abstractThe structural changes and the mechanism of benzene adsorption on microporous carbon hollow fiber membranes with different surface and pore network properties have been investigated by in situ small-angle X-ray scattering (SAXS) and benzene adsorption. Benzene adsorption measurements have been carried out in situ with SAXS alongside an adsorption/desorption isotherm cycle at 293 K with the aid of a specially constructed adsorption sample cell. In addition low-pressure C6H6 and high-pressure CO 2, CH4 and N2 adsorption isotherms have been performed. Two carbon hollow fiber membranes, both prepared by controlled pyrolysis procedures of polyimide membrane precursor, were under study. During benzene adsorption the intensity of the SAXS curves changes in a way that depends on how the pores are filled and the contrast fluctuations occur. The SAXS data have been modeled by evaluating the form factor of lamellar micropores upon filling with C6H6. The existence of ultra micropores within the surrounding matrix was also taken into account. The results suggest that the arrangement of the ultra micropores on the non-activated membrane is in such a way that the access of benzene to the micropores is restricted, resulting in an incomplete filling. On the other hand, the activation process generates a more accessible pore network where the micropores are completely filled. © 2012 Springer Science+Business Media New York.en
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heal.type.enConference presentationen
heal.type.elΔημοσίευση σε συνέδριοel
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