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O: Fachverband Oberflächenphysik

O 22: Poster Session II: New methods II

O 22.5: Poster

Montag, 1. März 2021, 13:30–15:30, P

Elucidation of Disordered Mesopore Constructs: A Kernel-Based Approach — •Henry R. N. B. Enninful, Dirk Enke, and Rustem Valiullin — Leipzig University

Detailed characterisation of the structure of mesoporous solids presents key insights into the accurate design of various industrial applications such as catalysis, molecular separations and adsorption, among others. Routine characterisation tools, such as gas sorption, typically utilise the general adsorption isotherm (GAI) equation derived for ordered pore systems. For disordered porous solids, the complex morphology with its resulting cooperativity effects in thermodynamic phase transitions renders characterisation more complex than what the GAI supports.

Herein, we present a kernel-based approach with the serially connected pore model (SCPM); an extension of the GAI which incorporates cooperativity effects in phase transitions arising from pore complexity. Modelled as a statistical linear chain of pores, the SCPM is validated with data from solid-liquid phase transitions of water in synthesized porous silica material of similar pore construct, MCM-41. To show its robustness, we employ the SCPM to reveal disorder in SBA-15 mesoporous solid.