title: Structural analysis of IPC zeolites and related materials using positron annihilation spectroscopy and high-resolution argon adsorption.
abstract: The advanced investigation of pore networks in isoreticular zeolites and mesoporous materials related to the IPC family was performed using high-resolution argon adsorption experiments coupled with the development of a state-of-the-art non-local density functional theory approach. The optimization of a kernel for model sorption isotherms for materials possessing the same layer structure, differing only in the interlayer connectivity (e.g. oxygen bridges, single- or double-four-ring building units, mesoscale pillars etc.) revealed remarkable differences in their porous systems. Using high-resolution adsorption data, the bimodal pore size distribution consistent with crystallographic data for IPC-6, IPC-7 and UTL samples is shown for the first time. A dynamic assessment by positron annihilation lifetime spectroscopy (PALS) provided complementary insights, simply distinguishing the enhanced accessibility of the pore network in samples incorporating mesoscale pillars and revealing the presence of a certain fraction of micropores undetected by gas sorption. Nonetheless, subtle differences in the pore size could not be discriminated based on the widely-applied Tao-Eldrup model. The combination of both methods can be useful for the advanced characterization of microporous, mesoporous and hierarchical materials.
authors.affiliation: Micromeritics Instrument Corporation, Norcross, GA 30093, USA.
authors.forename: J
authors.initials: J
authors.lastname: Jagiello
authors.affiliation: Micromeritics Instrument Corporation, Norcross, GA 30093, USA.
authors.forename: M
authors.initials: M
authors.lastname: Sterling
authors.affiliation: Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, 12840 Prague 2, Czech Republic. pavla.eliasova@jh-inst.cas.cz.
authors.forename: P
authors.initials: P
authors.lastname: Eliášová
authors.affiliation: Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, 12840 Prague 2, Czech Republic. pavla.eliasova@jh-inst.cas.cz and J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Dolejškova 3, 182 23 Prague 8, Czech Republic.
authors.forename: M
authors.initials: M
authors.lastname: Opanasenko
authors.affiliation: J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Dolejškova 3, 182 23 Prague 8, Czech Republic.
authors.forename: A
authors.initials: A
authors.lastname: Zukal
authors.affiliation: University of St Andrews, School of Chemistry, Purdie Building, St Andrews KY16 9ST, Scotland.
authors.forename: R E
authors.initials: RE
authors.lastname: Morris
authors.affiliation: University of St Andrews, School of Chemistry, Purdie Building, St Andrews KY16 9ST, Scotland.
authors.forename: M
authors.initials: M
authors.lastname: Navaro
authors.affiliation: Advanced Microscopy Laboratory (LMA), Nanoscience Institute of Aragon (INA), University of Zaragoza, Mariano Esquillor, Edificio I + D, Zaragoza 50018, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Mayoral
authors.affiliation: Institute for Particle Physics, Department of Physics, ETH Zürich, Otto-Stern-Weg 5, CH 8093, Switzerland.
authors.forename: P
authors.initials: P
authors.lastname: Crivelli
authors.affiliation: Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland.
authors.forename: R
authors.initials: R
authors.lastname: Warringham
authors.affiliation: Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland.
authors.forename: S
authors.initials: S
authors.lastname: Mitchell
authors.affiliation: Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland.
authors.forename: J
authors.initials: J
authors.lastname: Pérez-Ramírez
authors.affiliation: J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, v.v.i., Dolejškova 3, 182 23 Prague 8, Czech Republic and Center of Research Excellence in Petroleum Refining and Petrochemicals, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.
authors.forename: J
authors.initials: J
authors.lastname: Čejka