2022 Annual Meeting

(371m) Understanding Fluid Phase Behavior in Geometrically Disordered Mesoporous Materials

Author

Enninful, H. R. N. B. - Presenter, Universität Leipzig
Mesoporous solids exhibit structural disorder which strongly influences confined
fluid properties. This renders quantification of structural disorder and its
correlation with physical properties of confined matter a necessary step towards
their optimization in practical applications.

In this work, we present advances made in the understanding of correlations
between the phase state and geometric disorder in nanoporous solids. We
overview the recently developed statistical theory for phase transitions in a
minimalistic model of disordered pore networks represented by the linear chains
of pores with statistical disorder. Furthermore, we show that correlating its
predictions with various experimental observations, the model gives notable
insight into collective phenomena in phase-transition processes in disordered
materials and is capable of explaining self-consistently the majority of the
experimental results obtained for gas–liquid and solid–liquid equilibria in
mesoporous solids. We also show how a newly-introduced interconnectivity
parameter of the pore network can be assessed to describe the morphology of
porous solids.

References:
[1] Schneider D.; Kondrashova D.; Valiullin R., 2017, “Phase transitions in
disordered mesoporous solids”, Scientific Reports, 7, 7216.
[2] Schneider, D. and Valiullin R., 2019, “Capillary condensation and evaporation
in irregular channels: Sorption isotherm for serially connected pore model”,
Journal of Physical Chemistry C, 123, 16239.
[3] Enninful H.R.N.B., Schneider D., Hoppe A., König S., Fröba M., Enke D. and
Valiullin R., 2019, “Comparative gas sorption and cryoporometry study of
mesoporous glass structure: Application of the serially connected pore model”,
Frontiers in Chemistry, doi: 10.3389/fchem.2019.00230.
[4] Enninful H.R.N.B., Schneider D., Kohns R., Enke D. and Valiullin R., 2020, “A novel approach for advanced thermoporometry characterization of mesoporous
solids: Transition kernels and the serially connected pore model”, Microporous
and Mesoporous Materials 309, 110534.
[5] Enninful H.R.N.B., Schneider D., Enke D. and Valiullin R., 2021, “Impact of
Geometrical Disorder on Phase Equilibria of Fluids and Solids Confined in
Mesoporous Materials”, Langmuir, 37, 3521-3537.