Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 3111-3117 |
| Seitenumfang | 7 |
| Fachzeitschrift | Chemistry of materials |
| Jahrgang | 29 |
| Ausgabenummer | 7 |
| Publikationsstatus | Veröffentlicht - 9 März 2017 |
Abstract
Metal-organic frameworks (MOFs) with an exceptionally large pore volume and inner surface area are perfect materials for loading with intelligent guest molecules. First, an ultrathin 200 nm high-flux UiO-67 layer deposited on a porous α-Al2O3 support by solvothermal growth has been developed. This neat UiO-67 membrane is then used as a host material for light-responsive guest molecules. Azobenzene (AZB) is loaded in the pores of the UiO-67 membrane. From adsorption measurements, we determined that the pores of UiO-67 are completely filled with AZB and, thereby, steric hindrance inhibits any optical switching. After in situ thermally controlled desorption of AZB from the membrane, AZB can be switched and gas permeation changes are observed, yielding an uncomplicated and effective smart material with remote controllable gas permeation. The switching of AZB in solution and inside the host could be demonstrated by ultraviolet-visible spectroscopy. Tracking the completely reversible control over the permeance of CO2 and the H2/CO2 separation through the AZB-loaded UiO-67 layer is possible by in situ irradiation and permeation. Mechanistic investigations show that a light-induced gate opening and closing takes place. A remote controllable host-guest, ultrathin smart MOF membrane is developed, characterized, and applied to switch the gas composition by external stimuli.
ASJC Scopus Sachgebiete
- Chemie (insg.)
- Allgemeine Chemie
- Chemische Verfahrenstechnik (insg.)
- Allgemeine chemische Verfahrenstechnik
- Werkstoffwissenschaften (insg.)
- Werkstoffchemie
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in: Chemistry of materials, Jahrgang 29, Nr. 7, 09.03.2017, S. 3111-3117.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Azobenzene Guest Molecules as Light-Switchable CO2 Valves in an Ultrathin UiO-67 Membrane
AU - Knebel, Alexander
AU - Sundermann, Lion
AU - Mohmeyer, Alexander
AU - Strauß, Ina
AU - Friebe, Sebastian
AU - Behrens, Peter
AU - Caro, Jürgen
N1 - Funding information: The authors gratefully acknowledge funding through Deutsche Forschungsgemeinschaft (DFG, German Science Foundation). This work is part of DFG Priority Program SPP1928 (Coordination Networks: Building Blocks for Functional Systems). I.S. is grateful for the support through the Hanover School for Nanotechnology (HSN) and the Laboratory of Nano and Quantum Engineering (LNQE).
PY - 2017/3/9
Y1 - 2017/3/9
N2 - Metal-organic frameworks (MOFs) with an exceptionally large pore volume and inner surface area are perfect materials for loading with intelligent guest molecules. First, an ultrathin 200 nm high-flux UiO-67 layer deposited on a porous α-Al2O3 support by solvothermal growth has been developed. This neat UiO-67 membrane is then used as a host material for light-responsive guest molecules. Azobenzene (AZB) is loaded in the pores of the UiO-67 membrane. From adsorption measurements, we determined that the pores of UiO-67 are completely filled with AZB and, thereby, steric hindrance inhibits any optical switching. After in situ thermally controlled desorption of AZB from the membrane, AZB can be switched and gas permeation changes are observed, yielding an uncomplicated and effective smart material with remote controllable gas permeation. The switching of AZB in solution and inside the host could be demonstrated by ultraviolet-visible spectroscopy. Tracking the completely reversible control over the permeance of CO2 and the H2/CO2 separation through the AZB-loaded UiO-67 layer is possible by in situ irradiation and permeation. Mechanistic investigations show that a light-induced gate opening and closing takes place. A remote controllable host-guest, ultrathin smart MOF membrane is developed, characterized, and applied to switch the gas composition by external stimuli.
AB - Metal-organic frameworks (MOFs) with an exceptionally large pore volume and inner surface area are perfect materials for loading with intelligent guest molecules. First, an ultrathin 200 nm high-flux UiO-67 layer deposited on a porous α-Al2O3 support by solvothermal growth has been developed. This neat UiO-67 membrane is then used as a host material for light-responsive guest molecules. Azobenzene (AZB) is loaded in the pores of the UiO-67 membrane. From adsorption measurements, we determined that the pores of UiO-67 are completely filled with AZB and, thereby, steric hindrance inhibits any optical switching. After in situ thermally controlled desorption of AZB from the membrane, AZB can be switched and gas permeation changes are observed, yielding an uncomplicated and effective smart material with remote controllable gas permeation. The switching of AZB in solution and inside the host could be demonstrated by ultraviolet-visible spectroscopy. Tracking the completely reversible control over the permeance of CO2 and the H2/CO2 separation through the AZB-loaded UiO-67 layer is possible by in situ irradiation and permeation. Mechanistic investigations show that a light-induced gate opening and closing takes place. A remote controllable host-guest, ultrathin smart MOF membrane is developed, characterized, and applied to switch the gas composition by external stimuli.
UR - http://www.scopus.com/inward/record.url?scp=85017547974&partnerID=8YFLogxK
U2 - 10.1021/acs.chemmater.7b00147
DO - 10.1021/acs.chemmater.7b00147
M3 - Article
AN - SCOPUS:85017547974
VL - 29
SP - 3111
EP - 3117
JO - Chemistry of materials
JF - Chemistry of materials
SN - 0897-4756
IS - 7
ER -