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Pore shape and sorption behaviour in mesoporous ordered silica films
Author(s) -
Fritz-Popovski Gerhard,
Morak Roland,
Sharifi Parvin,
Amenitsch Heinz,
Paris Oskar
Publication year - 2016
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s1600576716013698
Subject(s) - grazing incidence small angle scattering , materials science , mesoporous material , shrinkage , scattering , mesoporous silica , calcination , composite material , sorption , porosity , small angle x ray scattering , relative humidity , coating , substrate (aquarium) , total internal reflection , pellets , chemical engineering , small angle neutron scattering , optics , chemistry , neutron scattering , biochemistry , physics , oceanography , organic chemistry , optoelectronics , adsorption , thermodynamics , geology , catalysis , engineering
Mesoporous silica films templated by pluronic P123 were prepared using spin and dip coating. The ordered cylindrical structure within the films deforms due to shrinkage during calcination. Grazing‐incidence small‐angle X‐ray scattering (GISAXS) measurements reveal that both the unit cell and the cross section of the pores decrease in size, mainly normal to the surface of the substrate, leading to elliptical cross sections of the pores with axis ratios of about 1:2. Water take‐up by the pores upon changing the relative humidity can be monitored quantitatively by the shift in the critical angle of X‐ray reflection as seen by the Yoneda peak.