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Coupling external and internal pressure for the structural transition of MIL-53(Cr)
Bin Zheng1, Jinlei Wang1, Li Zhang1
1School of Materials Science and Engineering, Xi'an University of Science and Technology, Xi'an 710054, PR China. zhengbin@xust.edu.cn.
Flexible metal-organic frameworks (MOFs) show volume changes under pressure. High methanol loading in MIL-53(Cr) MOFs significantly alters their structural transition pressure, enhancing potential for actuators and sensors.
Area of Science:
- Materials Science
- Chemistry
Background:
- Flexible metal-organic frameworks (MOFs) exhibit stimulated volume contractions, making them promising for actuators and sensors.
- The structural transitions in MOFs are influenced by guest molecules and external pressure.
Purpose of the Study:
- Investigate the structural transition of MIL-53(Cr) loaded with high concentrations of methanol (CH3OH) guest molecules.
- Determine how internal pressure from guest-guest interactions affects the MOF's structural transition.
Main Methods:
- Studied the MIL-53(Cr) MOF loaded with varying concentrations of methanol.
- Analyzed the pressure-induced structural transitions and microscopic characteristics.
Main Results:
- High methanol loading dramatically alters the pressure required for MIL-53(Cr) structural transition (e.g., 1 CH3OH/UC: 5 MPa vs. 8 CH3OH/UC: 280 MPa).
- Asymmetrical distortions in organic-inorganic connections characterize the transition.
- Internal and external pressures, rather than guest adsorption, dominate the structural transition at high loadings.
Conclusions:
- The high-pressure response of flexible MOF structures is significantly modulated by high guest molecule loading.
- Findings expand the potential pressure range for MOF-based actuators and sensors.
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