Gas transport in functionalized mesopores: structure-activity relationships
Synthesis and Properties of Functional Materials
Final Report Abstract
In this project, the gas flow through functionalized, mesoporous membranes was investigated. Three types of membranes, 9 types of functional groups and 10 different gas types have been investigated at 10 different temperatures ranging from 253 to 353 K. For that purpose, an established gas permeation setup has been fully automated enabling high throughput measurements at steady state. The obtained results confirm the first two initial hypotheses: There is a linear dependency between the decrease in gas flow and the length of the functional molecules as well as a vanishing of the selectivity effect observed in former studies at low temperatures. Surprisingly, however, no other correlation was found between functional group type and gas flow. Analyzing the experimental results by means of a rank correlation with molecular properties obtained from COSMOtherm simulations and literature, we identified molecular volume and surface as well as molecular polarizability as most influencing parameters pointing towards dispersion forces as a driving force for the enhanced selectivity observed for C16 functionalisations.
Publications
- (2020) Surface functionalization of mesoporous Membranes: Impact on Pore Structure and Gas Flow Mechanisms. ACS Applied Materials & Interfaces. 12(35), 39388–39396
B. Besser, S. Kunze, M. Wilhelm, K. Rezwan und J. Thöming
(See online at https://doi.org/10.1021/acsami.0c08619)
