title: Impact of molecular clustering inside nanopores on desorption processes.
abstract: Understanding the sorption kinetics of nanoporous systems is crucial for the development and design of novel porous materials for practical applications. Here, using a porous coordination polymer/quartz crystal microbalance (PCP/QCM) hybrid device, we investigate the desorption of various vapor molecules featuring different degrees of intermolecular (hydrogen bonding) or molecule-framework interactions. Our findings reveal that strong intermolecular interactions lead to the desorption process proceeding via an unprecedented metastable state, wherein the guest molecules are clustered within the pores, causing the desorption rate to be temporarily slowed. The results demonstrate the considerable impact of the chemical nature of an adsorbate on the kinetics of desorption, which is also expected to influence the efficiency of certain processes, such as desorption by gas purge.
authors.affiliation: Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshida, Kyoto 606-8501, Japan.
authors.forename: Manuel
authors.initials: M
authors.lastname: Tsotsalas
authors.forename: Pavel
authors.initials: P
authors.lastname: Hejcik
authors.forename: Kenji
authors.initials: K
authors.lastname: Sumida
authors.forename: Ziya
authors.initials: Z
authors.lastname: Kalay
authors.forename: Shuhei
authors.initials: S
authors.lastname: Furukawa
authors.forename: Susumu
authors.initials: S
authors.lastname: Kitagawa