A polyhedral oligomeric silsesquioxane functionalized copper trimesate

2015 ◽  
Vol 51 (40) ◽  
pp. 8418-8420 ◽  
Author(s):  
E. S. Sanil ◽  
Kyung-Ho Cho ◽  
Do-Young Hong ◽  
Ji Sun Lee ◽  
Su-Kyung Lee ◽  
...  
Keyword(s):  
External Surface ◽  
Metal Organic Framework ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
Metal Organic ◽  
The Stability ◽  
Oligomeric Silsesquioxane ◽  
Organic Framework

A metal–organic framework (MOF), copper trimesate (Cu3(BTC)2), was selectively functionalized with aminopropylisooctyl polyhedral oligomeric silsesquioxane (O-POSS) to make the external surface of Cu3(BTC)2 hydrophobic and thereby enhance the stability of the material against humidity.

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.

scholarly journals Enhancing the stability and porosity of penetrated metal–organic frameworks through the insertion of coordination sites

2018 ◽  
Vol 9 (4) ◽  
pp. 950-955 ◽  
Author(s):  
Rui Feng ◽  
Yan-Yuan Jia ◽  
Zhao-Yang Li ◽  
Ze Chang ◽  
Xian-He Bu
Keyword(s):  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Structure And Properties ◽  
Coordination Sites ◽  
Metal Organic ◽  
The Stability ◽  
Enhanced Stability ◽  
Organic Framework

Guided by the insertion of coordination sites within ligands, an interpenetrated metal–organic framework (MOFs) NKU-112 and a self-penetrated framework NKU-113 were obtained. The enhanced stability and porosity of NKU-113 prove the efficiency of the method for the structure and properties modulation of penetrated MOFs.

A bracket approach to improve the stability and gas sorption performance of a metal–organic framework via in situ incorporating the size-matching molecular building blocks

2016 ◽  
Vol 52 (54) ◽  
pp. 8413-8416 ◽  
Author(s):  
Di-Ming Chen ◽  
Jia-Yue Tian ◽  
Chun-Sen Liu ◽  
Miao Du
Keyword(s):  
Metal Organic Framework ◽  
Building Blocks ◽  
Gas Sorption ◽  
Molecular Building Blocks ◽  
Metal Organic ◽  
Coordination Framework ◽  
The Stability ◽  
Organic Framework

The robustness and gas sorption performance of a coordination framework can be greatly improved by incorporating size-matching molecular building blocks.

scholarly journals Enhancing the Stability of COVID‐19 Serological Assay through Metal–Organic Framework Encapsulation

2021 ◽  
pp. 2100410
Author(s):  
Yixuan Wang ◽  
Zheyu Wang ◽  
Prashant Gupta ◽  
Jeremiah J. Morrissey ◽  
Rajesh R. Naik ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Serological Assay ◽  
Metal Organic ◽  
The Stability ◽  
Organic Framework

scholarly journals A cobalt-organic framework with sensitive detection of Fe3+, Cr2O72–, and CrO42– ions in water

2021 ◽  
Author(s):  
Zhen Zhang ◽  
Han-Xu Sun ◽  
Shi-Fen Li ◽  
Rui-Dong Wang ◽  
Lin Du ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Metal Organic Framework ◽  
Surface Characteristics ◽  
The Novel ◽  
Elemental Analyses ◽  
Metal Organic ◽  
Crystal Structural ◽  
The Stability ◽  
Ph Range ◽  
Organic Framework

Abstract A six-coordinated 3D metal–organic framework (MOF), namely, [Co(BPDC)(3-bpdb)(H2O)2]n (1) (H2BPDC = 4,4′-biphenyldicarboxylic acid, 3-bpdb = 1,4-bis(3-pyridyl)-2,3-diaza-1,3-butadiene) was purposefully constructed and characterized by single-crystal XRD, IR, elemental analyses, PXRD, SEM, and TGA. Crystal structural analysis revealed that the complex consists of a cds-type three-fold interpenetrated framework. Hirshfeld surface analysis yielded details of the surface characteristics of 1. Significant O−H···O hydrogen bonding interactions, which could promote the stability of the framework, were found is extremely stable in aqueous solution and can resist acids and bases over an extensive pH range of 2 - 13. 1 shows brilliant fluorescent emission in the solid state and in aqueous solution. Fluorescence titration, cyclic, and anti-interference experiments demonstrated that 1 is an excellent probe for Fe3+, CrO42‒ and Cr2O72‒ in water. The Ksv values of 1 for Fe3+, CrO42‒, and Cr2O72‒, which were as high as 1.06 × 104 M−1, 1.50 × 104 M−1, and 1.16 × 104 M−1, respectively, were comparable with those of other sensors. The quenching mechanism of the novel probe was subsequently explained.

The Biocompatibility of Metal–Organic Framework Coatings: An Investigation on the Stability of SURMOFs with Regard to Water and Selected Cell Culture Media

Langmuir ◽  
2012 ◽  
Vol 28 (17) ◽  
pp. 6877-6884 ◽  
Author(s):  
Maximilian Hanke ◽  
Hasan K. Arslan ◽  
Stella Bauer ◽  
Olexandra Zybaylo ◽  
Christof Christophis ◽  
...  
Keyword(s):  
Cell Culture ◽  
Culture Media ◽  
Metal Organic Framework ◽  
Cell Culture Media ◽  
Metal Organic ◽  
The Stability ◽  
Organic Framework

scholarly journals Aqueous synthesis of highly adsorptive copper–gallic acid metal–organic framework

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Badril Azhar ◽  
Artik Elisa Angkawijaya ◽  
Shella Permatasari Santoso ◽  
Chintya Gunarto ◽  
Aning Ayucitra ◽  
...  
Keyword(s):  
Gallic Acid ◽  
Metal Organic Framework ◽  
Synthesis Temperature ◽  
Molar Ratio ◽  
Aqueous Synthesis ◽  
Synthesis Conditions ◽  
Metal Organic ◽  
The Stability ◽  
Adsorption Desorption ◽  
Organic Framework

Abstract A greener route to synthesize mesoporous copper–gallic acid metal–organic framework (CuGA MOF) than the conventional method using harmful DMF solvent was proposed in this study. Various synthesis attempts were conducted by modifying the synthesis conditions to produce CuGA MOF with comparable physical properties to a reference material (DMF-synthesized CuGA NMOF). The independent variables investigated include the molar ratio of NaOH to GA (1.1 to 4.4) and the synthesis temperature (30, 60, 90 °C). It was found that proper NaOH addition was crucial for suppressing the generation of copper oxide while maximizing the formation of CuGA MOF. On the other hand, the reaction temperature mainly affected the stability and adsorption potential of CuGA MOF. Reacting Cu, GA, and NaOH at a molar ratio of 1:1:2.2 and a temperature of 90 °C, produced mesoporous MOF (CuGA 90–2.2) with a surface area of 198.22 m2/g, a pore diameter of 8.6 nm, and a thermal stability of 219 °C. This MOF exhibited an excellent adsorption capacity for the removal of methylene blue (124.64 mg/g) and congo red (344.54 mg/g). The potential usage of CuGA 90–2.2 as a reusable adsorbent was demonstrated by its high adsorption efficiency (> 90%) after 5 adsorption–desorption cycles.

scholarly journals Ultrathin hydrophobic films based on the metal organic framework UiO-66-COOH(Zr)

2019 ◽  
Vol 10 ◽  
pp. 654-665 ◽  
Author(s):  
Miguel A Andrés ◽  
Clemence Sicard ◽  
Christian Serre ◽  
Olivier Roubeau ◽  
Ignacio Gascón
Keyword(s):  
Metal Organic Framework ◽  
Grazing Incidence ◽  
Vertical Position ◽  
Water Contact ◽  
Force Microscopy ◽  
Langmuir Blodgett ◽  
Atomic Force ◽  
Metal Organic ◽  
The Stability ◽  
Organic Framework

This work reports on the fabrication, optimization and characterization of ultrathin films containing submicrometer particles (sMPs) of the hydrophilic and water stable UiO-66-COOH(Zr) metal organic framework (MOF). MOF particles of ≈200 nm have been synthesized and assembled at the air–water interface by the Langmuir–Blodgett technique. The use of different solvents, mixtures of solvents and surfactants has been investigated in order to improve the stability of MOF dispersions and reduce particle aggregation. The compact MOF/surfactant films containing 10 wt % octadecylphoshonic acid (ODP) have been deposited on substrates of different nature by Langmuir–Blodgett (LB) and Langmuir–Schaefer (LS) methods, showing that the presence of even only one MOF/ODP monolayer can increase the water contact angle of highly hydrophilic substrates such as mica or glass up to 120°. These films were characterized by scanning electron microscopy, grazing incidence X-ray diffraction, Fourier transform infrared spectroscopy and atomic force microscopy, revealing the formation of a continuous film where ODP molecules adopt an almost vertical position and cover MOF particles. Moreover, the presence of MOF particles significantly enhances the surface roughness and allows ultrathin, hydrophobic coverage to be obtained. Finally, it has been shown that the crystallinity and the porosity of the MOF remains almost unaltered in MOF/ODP films.

scholarly journals Increasing the stability of Mg2(dobpdc) metal–organic framework in air through solvent removal

2017 ◽  
Vol 1 (3) ◽  
pp. 444-448 ◽  
Author(s):  
Jenny G. Vitillo ◽  
Silvia Bordiga
Keyword(s):  
Metal Organic Framework ◽  
Polar Molecules ◽  
Solvent Removal ◽  
Metal Organic ◽  
The Stability ◽  
Organic Framework

A simple way to increase MOFs stability in air? Solvent removal. Counterintuitive? No, it is not. The condensation of water is delayed by removing all the solvent (polar) molecules from the pores.

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