Multilevel Morphology of Complex Nanoporous Materials

Langmuir : the ACS Journal of Surfaces and Colloids
Ahmad MotahariDale W Schaefer

Abstract

This work exploits gas adsorption and small-angle X-ray scattering (SAXS) to determine the morphology of complex nanoporous materials. We resolve multiple classes of porosity including previously undetected large-scale texture that significantly compromises the canonical interpretation of gas adsorption. Specifically, a UVM-7 class mesoporous silica was synthesized that has morphological features on three length scales: macropores due to packing of 150 nm globules, 1.9 nm radius spherical mesopores inside the globules, and >7 nm pockets on and between the globules. The total and external surface areas, as well as the mesopore volume, were determined using gas adsorption (αs-plot) and SAXS. A new approach was applied to the SAXS data using multilevel fitting to determine the surface areas on multiple length scales. The SAXS analysis code is applicable to any two-phase system and is freely available to the public. The total surface area determined by SAXS was 12% greater than that obtained by gas adsorption. The macropore interfacial area, however, is only 30% of the external surface area determined by the αs-plot. The overestimation of the external surface area by the αs-plot method is attributed to capillary condensation in nan...Continue Reading

References

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May 17, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Gennady Yu Gor, Alexander V Neimark

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Citations

Oct 8, 2019·Soft Matter·Harald RennhoferFalk W Liebner

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