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Updated: Jul 12, 2026

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
Published on: May 15, 2017
Regular intergrowth in the AFI-type crystals: influence on the intracrystalline adsorbate distribution as observed by
Enrico Lehmann1, Christian Chmelik, Holger Scheidt
1Institut für Experimentelle Physik I, Universität Leipzig, Linnéstrasse 5, D-04103, Leipzig, Germany.
Abstract:
Interference microscopy and FTIR microscopy are applied to study intracrystalline concentration profiles of methanol in CrAPO-5 zeolite crystals. By using both techniques, the high spatial resolution of interference microscopy is complemented by the ability of FTIR spectroscopy to pinpoint adsorbates by their characteristic IR bands. For the first time two-dimensional concentration profiles of an unprecedented quality are reported which show a nonhomogeneous distribution of adsorbate in zeolite crystal under equilibrium with the adsorbate vapor. These nonhomogeneous profiles are attributed to regular intergrowth effects in CrAPO-5. A possible internal structure of CrAPO-5 crystals is suggested.
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