Quantifying adsorption-induced deformation of nanoporous materials on different length scales

Roland Morak, Stephan Braxmeier, Lukas Ludescher, Florian Putz, Sebastian Busch, Nicola Hüsing, Gudrun Reichenauer, Oskar Paris

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung

11 Zitate (Scopus)

Abstract

A new in situ setup combining small-angle neutron scattering (SANS) and dilatometry was used to measure water-adsorption-induced deformation of a monolithic silica sample with hierarchical porosity. The sample exhibits a disordered framework consisting of macropores and struts containing two-dimensional hexagonally ordered cylindrical mesopores. The use of an H2O/D2O water mixture with zero scattering length density as an adsorptive allows a quantitative determination of the pore lattice strain from the shift of the corresponding diffraction peak. This radial strut deformation is compared with the simultaneously measured macroscopic length change of the sample with dilatometry, and differences between the two quantities are discussed on the basis of the deformation mechanisms effective at the different length scales. It is demonstrated that the SANS data also provide a facile way to quantitatively determine the adsorption isotherm of the material by evaluating the incoherent scattering contribution of H2O at large scattering vectors.
OriginalspracheEnglisch
Aufsatznummer5
Seiten (von - bis)1404-1410
Seitenumfang7
FachzeitschriftJournal of applied crystallography
Jahrgang50.2017
DOIs
PublikationsstatusVeröffentlicht - 2017

Schlagwörter

  • mesoporous materials; small-angle neutron scattering; dilatometry; adsorption-induced deformation; adsorption isotherms.

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