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Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory
Published on: March 7, 2018
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Mechanical Properties and Processing Techniques of Bulk Metal-Organic Framework Glasses
Shichun Li1,2, René Limbach3, Louis Longley1
1Department of Materials Science and Metallurgy , University of Cambridge , Charles Babbage Road , Cambridge CB3 0FS , U.K.
Journal of the American Chemical Society
|December 25, 2018
Summary
This study introduces metal-organic framework (MOF) glasses, a new glass category. Researchers measured mechanical properties like hardness and creep resistance, paving the way for MOF glass applications.
Area of Science:
- Materials Science
- Glass Science
- Nanotechnology
Background:
- Metal-organic framework (MOF) glasses represent a novel class of materials, distinct from traditional glasses due to their metal-ligand coordination bonding.
- Understanding the mechanical properties of MOF glasses is crucial for their potential applications in protective coatings and display technologies.
- Limited processing methods for bulk MOF glass samples have hindered experimental studies on their mechanical characteristics.
Purpose of the Study:
- To investigate the mechanical properties, including Young's modulus, hardness, and creep resistance, of melt-quenched zeolitic imidazolate framework (ZIF) glasses.
- To develop and apply processing techniques for fabricating bulk MOF glass samples suitable for mechanical testing.
- To evaluate the scratch resistance of MOF glasses for the first time.
Main Methods:
- Nanoindentation techniques were employed to measure the Young's modulus and hardness of four different melt-quenched ZIF glasses (agZIF-4, agZIF-62, agZIF-76, and agZIF-76-mbIm).
- Creep resistance was assessed using strain-rate jump (SRJ) tests and constant load and hold (CLH) indentation creep experiments.
- Remelting and annealing were used to successfully fabricate a transparent, bubble-free bulk MOF glass specimen for scratch testing.
Main Results:
- The study determined the Young's modulus and hardness of the investigated MOF glasses.
- Strain-rate sensitivity values were found to be comparable to those of glassy polymers and Se-rich GeSe chalcogenide glasses.
- Successful fabrication of a bulk MOF glass sample enabled the first-ever scratch testing experiments on this material class.
Conclusions:
- Melt-quenched MOF glasses exhibit distinct mechanical properties that can be quantified through nanoindentation and creep experiments.
- The development of effective processing methods, such as remelting and annealing, is key to enabling comprehensive mechanical characterization of MOF glasses.
- This research lays the groundwork for exploring the practical applications of MOF glasses in areas requiring robust mechanical performance.
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