Multilevel Morphology of Complex Nanoporous Materials

Motahari, Ahmad; Hu, Naiping; Vahid, Amir; Omrani, Abdollah; Rostami, Abbas Ali; Schaefer, Dale W.

doi:10.1021/acs.langmuir.8b00970

Multilevel Morphology of Complex Nanoporous Materials

Journal Article · Mon May 14 00:00:00 EDT 2018 · Langmuir

DOI:https://doi.org/10.1021/acs.langmuir.8b00970· OSTI ID:1455249

^[1]; Hu, Naiping ^[2]; Vahid, Amir ^[3]; ^[4]; ^[4]; ^[2]

Univ. of Cincinnati, OH (United States); Univ. of Mazandaran, Babolsar (Iran)
Univ. of Cincinnati, OH (United States)
Research Inst. of Petroleum Industry, Tehran (Iran)
Univ. of Mazandaran, Babolsar (Iran)

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 (α_s-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 α_s-plot. The overestimation of the external surface area by the αs-plot method is attributed to capillary condensation in nanoscale surface irregularities. Here, the discrepancy is resolved assuming that the macropore–globule interfaces harbor fractally distributed nooks and crannies, which lead to gas adsorption at pressures above the mesopore filling pressure.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: NSF

OSTI ID:: 1455249

Journal Information:: Langmuir, Journal Name: Langmuir Journal Issue: 23 Vol. 34; ISSN 0743-7463

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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surface chemistry

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