Poly(L -lactic acid) metal organic framework composites: optical, thermal and mechanical properties

2011 ◽  
Vol 61 (1) ◽  
pp. 30-37 ◽  
Author(s):  
Dhayalan Elangovan ◽  
Isinay E Yuzay ◽  
Susan E M Selke ◽  
Rafael Auras
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Metal Organic Framework ◽  
Thermal And Mechanical Properties ◽  
Metal Organic ◽  
Organic Framework

Mechanical Properties of a Metal–Organic Framework formed by Covalent Cross-Linking of Metal–Organic Polyhedra

2018 ◽  
Vol 141 (2) ◽  
pp. 1045-1053 ◽  
Author(s):  
Garima Lal ◽  
Maziar Derakhshandeh ◽  
Farid Akhtar ◽  
Denis M. Spasyuk ◽  
Jian-Bin Lin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Metal Organic Framework ◽  
Cross Linking ◽  
Metal Organic ◽  
Organic Framework

scholarly journals Bimetallic AgPd/UiO-66 Hybrid Catalysts for Propylene Glycol Oxidation into Lactic Acid

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5471
Author(s):  
Sergey Ten ◽  
Viktoriia V. Torbina ◽  
Vladimir I. Zaikovskii ◽  
Sergei A. Kulinich ◽  
Olga Vodyankina
Keyword(s):  
Lactic Acid ◽  
Propylene Glycol ◽  
External Surface ◽  
Pore Space ◽  
Metal Organic Framework ◽  
Acetonitrile Solution ◽  
Transition Electron Microscopy ◽  
Metal Organic ◽  
Temperature Programmed ◽  
Organic Framework

Different methods (the wetness impregnation of Ag and Pd precursors dissolved in water or acetonitrile solution, and the double solvent impregnation technique) were employed to immobilize Ag–Pd nanoparticles (NPs) into the pores of the microporous zirconium-based metal-organic framework known as UiO-66. The obtained materials were characterized by using nitrogen adsorption-desorption at −196 °C, powder X-ray diffraction, UV-Vis diffusion reflectance spectroscopy, and transition electron microscopy measurements. Special attention was paid to the acid and redox properties of the obtained materials, which were studied by using temperature-programmed desorption of ammonia (TPD-NH3) and temperature-programmed reduction (TPR-H2) methods. The use of a drying procedure prior to reduction was found to result in metallic NPs which, most likely, formed on the external surface and were larger than corresponding voids of the metal-organic framework. The formation of Ag–Pd alloy or monometallic Ag and Pd depended on the nature of both metal precursors and the impregnation solvent used. Catalytic activity of the AgPd/UiO-66 materials in propylene glycol oxidation was found to be a result of synergistic interaction between the components in AgPd alloyed NPs immobilized in the pore space and on the external surface of UiO-66. The key factor for consistent transformation of propylene glycol into lactic acid was the proximity between redox and acid-base species.

Mechanical properties of cubic zinc carboxylate IRMOF-1 metal-organic framework crystals

2007 ◽  
Vol 76 (18) ◽  
Author(s):  
D. F. Bahr ◽  
J. A. Reid ◽  
W. M. Mook ◽  
C. A. Bauer ◽  
R. Stumpf ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Metal Organic Framework ◽  
Metal Organic ◽  
Organic Framework

scholarly journals Nanomechanical Properties and Failure Mechanisms of Two-Dimensional Metal-Organic Framework Nanosheets

2020 ◽  
Author(s):  
Zhixin Zeng ◽  
Irina Flyagina ◽  
Jin-Chong Tan
Keyword(s):  
Mechanical Properties ◽  
Failure Modes ◽  
Metal Organic Framework ◽  
Failure Mechanisms ◽  
Cohesive Elements ◽  
Plastic Properties ◽  
Interfacial Sliding ◽  
Porous Nanosheets ◽  
Metal Organic ◽  
Organic Framework

Nanoscale mechanical properties measurement of porous nanosheets presents many challenges. Herein we show atomic force microscope (AFM) nanoindentation to probe the nanoscale mechanical properties of a 2‑D metal‑organic framework (MOF) nanosheet material, termed CuBDC [copper 1,4‑benzenedicarboxylate]. The sample thickness was ranging from ~10 nm (tens of monolayers) up to ~400 nm (stack of multilayers). In terms of its elastic‑plastic properties, the Young’s modulus (<i>E</i> ~ 22.9 GPa) and yield strength (𝜎<sub>Y</sub> ~ 448 MPa) have been determined in the through-thickness direction. Moreover, we have characterized the failure mechanisms of the CuBDC nanosheets, where three failure mechanisms have been identified: interfacial sliding, fracture of framework, and delamination of multilayered nanosheets. Threshold forces and corresponding indentation depths corresponding to the failure modes have been determined. To gain insights into the failure mechanisms, we employ finite-element models with cohesive elements to simulate the interfacial debonding of a stack of 2‑D nanosheets during the indentation process. The nanomechanical AFM methodology elucidated here will be pertinent to the study of other 2‑D hybrid nanosheets and van der Waals solids.

Enhanced mechanical properties of a metal–organic framework by polymer insertion

2019 ◽  
Vol 55 (5) ◽  
pp. 691-694 ◽  
Author(s):  
Tomoya Iizuka ◽  
Kayako Honjo ◽  
Takashi Uemura
Keyword(s):  
Mechanical Properties ◽  
Metal Organic Framework ◽  
Polymer Chains ◽  
Metal Organic ◽  
Organic Framework

The mechanical properties of a metal–organic framework were highly improved by the insertion of polymer chains into the nanochannels.

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