Quantifying adsorption-induced deformation of nanoporous materials on different length scales
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In: Journal of applied crystallography, Vol. 50.2017, 5, 2017, p. 1404-1410.
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TY - JOUR
T1 - Quantifying adsorption-induced deformation of nanoporous materials on different length scales
AU - Morak, Roland
AU - Braxmeier, Stephan
AU - Ludescher, Lukas
AU - Putz, Florian
AU - Busch, Sebastian
AU - Hüsing, Nicola
AU - Reichenauer, Gudrun
AU - Paris, Oskar
PY - 2017
Y1 - 2017
N2 - A new in situ setup combining small-angle neutron scattering (SANS) anddilatometry was used to measure water-adsorption-induced deformation of amonolithic silica sample with hierarchical porosity. The sample exhibits adisordered framework consisting of macropores and struts containing twodimensionalhexagonally ordered cylindrical mesopores. The use of an H2O/D2O water mixture with zero scattering length density as an adsorptive allows aquantitative determination of the pore lattice strain from the shift of thecorresponding diffraction peak. This radial strut deformation is compared withthe simultaneously measured macroscopic length change of the sample withdilatometry, and differences between the two quantities are discussed on thebasis of the deformation mechanisms effective at the different length scales. It isdemonstrated that the SANS data also provide a facile way to quantitativelydetermine the adsorption isotherm of the material by evaluating the incoherentscattering contribution of H2O at large scattering vectors.
AB - A new in situ setup combining small-angle neutron scattering (SANS) anddilatometry was used to measure water-adsorption-induced deformation of amonolithic silica sample with hierarchical porosity. The sample exhibits adisordered framework consisting of macropores and struts containing twodimensionalhexagonally ordered cylindrical mesopores. The use of an H2O/D2O water mixture with zero scattering length density as an adsorptive allows aquantitative determination of the pore lattice strain from the shift of thecorresponding diffraction peak. This radial strut deformation is compared withthe simultaneously measured macroscopic length change of the sample withdilatometry, and differences between the two quantities are discussed on thebasis of the deformation mechanisms effective at the different length scales. It isdemonstrated that the SANS data also provide a facile way to quantitativelydetermine the adsorption isotherm of the material by evaluating the incoherentscattering contribution of H2O at large scattering vectors.
KW - mesoporous materials; small-angle neutron scattering; dilatometry; adsorption-induced deformation; adsorption isotherms.
U2 - 10.1107/S1600576717012274
DO - 10.1107/S1600576717012274
M3 - Article
VL - 50.2017
SP - 1404
EP - 1410
JO - Journal of applied crystallography
JF - Journal of applied crystallography
SN - 1600-5767
M1 - 5
ER -