Cited 0 time in webofscience Cited 0 time in scopus

Practical Use of Microwave for Activation of Metal-Organic Frameworks under Ambient Condition

Title
Practical Use of Microwave for Activation of Metal-Organic Frameworks under Ambient Condition
Authors
Lee, Eun JiJeong, Nak Cheon
DGIST Authors
Jeong, Nak Cheon
Issue Date
2019-04-18
Citation
제123회 대한화학회 학술발표회
Type
Conference
Abstract
Metal−organic frameworks (MOFs) are an interesting class of porous materials that are self- assembled by coordination bonding between metal node and organic ligand. Open coordination site (OCS) in MOFs, which is coordinatively unsaturated sites, has proven to play an important role in various applications of MOFs, such as molecule separation, energy storage, electronic conduction, ionic conduction, catalysis, and sensing. To utilize the OCS for such applications, activation process, which is a process to remove coordinated molecules at OCSs, is essentially required. To date, thermal activation (TA), an activation process normally conducted by applying thermal energy higher than the bond dissociation energy of solvent molecules in its extent, has been the most popularly used method. However, TA process needs to maintain high vacuum (> 103 torr) for approximately 20 hours even at high temperature. Thus, this process requires extra-equipment such as schlenk line connected to a vacuum pump and electric heater in order to make the conditions. Meanwhile, microwave accelerates the rotational motion of molecules. In the aspect of thermodynamics, the excited molecule in its rotational motion is promptly relaxed, and subsequently, the relaxation energy is converted to thermal energy. We hypothesized that solvents molecules residing in the nanospace of MOF can be excited in rotational motion by absorbing microwave, and the subsequent rotational relaxation can emit nanoscale thermal energy. By utilizing this thermal energy, we further hypothesized that both coordinated solvent molecules and pore-filled solvent molecules can be removed. In this presentation, we demonstrate that applying microwave is an efficient method for the activation of OCS-containing MOFs. More precisely, we observed that MOFs such as HKUST-1 and MOF-74 series can be completely activated under ambient conditions.
URI
http://hdl.handle.net/20.500.11750/14493
Publisher
대한화학회
Related Researcher
  • Author Jeong, Nak Cheon Supramolecular Inorganic Chemistry Laboratory
  • Research Interests Inorganic Chemistry; Metal-Organic Framework; Nanoporous Materials; Electron Transport;Ion Transport
Files:
There are no files associated with this item.
Collection:
Department of Physics and ChemistrySupramolecular Inorganic Chemistry Laboratory2. Conference Papers


qrcode mendeley

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE