SKM 2021 – wissenschaftliches Programm
CPP 8.23: Poster
Mittwoch, 29. September 2021, 17:30–19:30, P
Phase Transitions in Disordered Mesoporous Solids: Effect of Geometric Disorder — •Henry R. N. B. Enninful, Dirk Enke, and Rustem Valiullin — Leipzig University, Leipzig, Germany
Majority of porous solids used in industrial processes such as energy storage, separations and catalysis possess structural disorder over varying length scales. These disorder effects strongly affect the properties of the confining fluids in the pores. Hence, detailed quantification of structural disorder with correlation to fluid phase behavior is a necessary step towards optimization for practical applications.
Employing the serially connected pore model, (SCPM), we have determined the impact of a number of disorder-related parameters, including effect of pore chain length, *powder effect* and interconnectivity effect on phase transitions in disordered mesopore spaces. Additionally, we have showed experimental results from solid-liquid phase transitions obtained by NMR cryoporometry and gas-liquid transitions observed from nitrogen sorption experiments to corroborate the theoretical predictions from the SCPM.
We conclude that, the SCPM has the potential of explaining many features of experimentally observed phase transitions in disordered mesoporous solids.
References  Enninful et 2020, Microporous and Mesoporous Materials 309, 110534.  Enninful et 2021, Langmuir 37, 12, 3521*3537.