scholarly journals Manipulating the Morphology of a Metal-Organic Framework: UiO-66

2021 ◽  
Author(s):  
Musammat Muthmanna Abdul Kader ◽  
Chil-Hung Cheng
Keyword(s):  
Solvothermal Synthesis ◽  
Metal Organic Framework ◽  
Crystallization Rate ◽  
Triethylene Glycol ◽  
Synthesis Temperature ◽  
Synthesis Time ◽  
Direct Precipitation ◽  
Stirring Time ◽  
Metal Organic ◽  
First Time

Metal-Organic Frameworks (MOFs) are an emerging group of crystalline microporous materials that exhibit tunability towards various applications in gas storage, catalysts, and others. This project investigated the effects of reaction variables on UiO-66 via solvothermal synthesis. The results via the direct precipitation route at producing UiO-66 suggested that the crystallization rate was rather stagnant during the 30-day synthesis time, rendering the room temperature synthesis infeasible. Subsequently, the project investigated the effects of stirring time of the reactants for the first time in solvothermal synthesis, temperature, reaction time, modulator ratio, and reactant concentrations, on the morphology of UiO-66. Finally, the project studied the effects of adding glycols as co-solvents on UiO-66 crystal morphology. It was observed that only using ethylene glycol as a co-solvent successfully reformed the morphology of UiO-66 crystals from rounded octahedral crystals to anisotropic needle-like fibers. The results also indicated that diethylene glycol significantly improved the crystallinity of UiO-66 than triethylene glycol did.

scholarly journals Manipulating the Morphology of a Metal-Organic Framework: UiO-66

2021 ◽  
Author(s):  
Musammat Muthmanna Abdul Kader ◽  
Chil-Hung Cheng
Keyword(s):  
Solvothermal Synthesis ◽  
Metal Organic Framework ◽  
Crystallization Rate ◽  
Triethylene Glycol ◽  
Synthesis Temperature ◽  
Synthesis Time ◽  
Direct Precipitation ◽  
Stirring Time ◽  
Metal Organic ◽  
First Time

Metal-Organic Frameworks (MOFs) are an emerging group of crystalline microporous materials that exhibit tunability towards various applications in gas storage, catalysts, and others. This project investigated the effects of reaction variables on UiO-66 via solvothermal synthesis. The results via the direct precipitation route at producing UiO-66 suggested that the crystallization rate was rather stagnant during the 30-day synthesis time, rendering the room temperature synthesis infeasible. Subsequently, the project investigated the effects of stirring time of the reactants for the first time in solvothermal synthesis, temperature, reaction time, modulator ratio, and reactant concentrations, on the morphology of UiO-66. Finally, the project studied the effects of adding glycols as co-solvents on UiO-66 crystal morphology. It was observed that only using ethylene glycol as a co-solvent successfully reformed the morphology of UiO-66 crystals from rounded octahedral crystals to anisotropic needle-like fibers. The results also indicated that diethylene glycol significantly improved the crystallinity of UiO-66 than triethylene glycol did.

scholarly journals Study the influence of Solvothermal Conditions Changing On UiO-66

2019 ◽  
Vol 26 (1) ◽  
pp. 186-192
Author(s):  
Rana Aalrubaye ◽  
Ibtehaj Faisal Abdulraheem ◽  
Shaymaa ABDUlRAHEEM Ahmed
Keyword(s):  
Phase Change ◽  
Metal Organic Framework ◽  
Physicochemical Characteristics ◽  
Synthesis Temperature ◽  
Sem Analysis ◽  
Degree Of Crystallinity ◽  
Main Peak ◽  
Synthesis Time ◽  
Metal Organic ◽  
The Degree Of Crystallinity

Metal Organic framework UiO-66 considered to have significant physicochemical characteristics with great potential for various applications. Nevertheless obtaining high porous prosperities by optimization the synthesizing method remained challenge. In this study, a solvothermal method has been used to synthesis the UiO-66 with different synthesis time (12, 24, 48, 72 and 96 hours) and different heated (80, 100, 120, and 140 °C). By changing the temperature up to 140 and synthesis time 24 h the main peak intensity increased. The XRD and SEM analysis showed that by increasing the synthesis temperature the degree of crystallinity increased and cubic shape crystals was obtained. The XRD characterization analysis for UiO-66 showed the white powdered obtained at 12 h reaction time and 140 °C synthesis temperatures was the highest XRD intensity at 7.3°, 8.4°, 25.6° and 30.6° 2Theta. When changing the synthesis time for 48 h or longer, XRD diffractograms revealed  phase change and that the intensity at 7.3° 2Theta was lower than the intensity at 8.5° 2Theta, with new peaks appeared. SEM analysis confirmed the phase change after synthesis time 48h, by changing the crystals square clusters shape  to the needle-like shape.

Solvent-Free Powder Synthesis and MOF-CVD Thin Films of the Mesoporous Metal-Organic Framework MAF-6

2019 ◽  
Author(s):  
Timothée Stassin ◽  
Ivo Stassen ◽  
Joao Marreiros ◽  
Alexander John Cruz ◽  
Rhea Verbeke ◽  
...  
Keyword(s):  
Vapor Phase ◽  
Metal Organic Framework ◽  
Chemical Vapor ◽  
Uptake Capacity ◽  
Powder Synthesis ◽  
Crystalline Films ◽  
Metal Organic ◽  
Mesoporous Metal ◽  
First Time ◽  
Organic Framework

A simple solvent- and catalyst-free method is presented for the synthesis of the mesoporous metal-organic framework (MOF) MAF-6 (RHO-Zn(eIm)2) based on the reaction of ZnO with 2-ethylimidazole vapor at temperatures ≤ 100 °C. By translating this method to a chemical vapor deposition (CVD) protocol, mesoporous crystalline films could be deposited for the first time entirely from the vapor phase. A combination of PALS and Kr physisorption measurements confirmed the porosity of these MOF-CVD films and the size of the MAF-6 supercages (diam. ~2 nm), in close agreement with powder data and calculations. MAF-6 powders and films were further characterized by XRD, TGA, SEM, FTIR, PDF and EXAFS. The exceptional uptake capacity of the mesoporous MAF-6 in comparison to the microporous ZIF-8 is demonstrated by vapor-phase loading of a molecule larger than the ZIF-8 windows.

Solvothermal synthesis of new metal organic framework structures in the zinc–terephthalic acid–dimethyl formamide system

2005 ◽  
Vol 178 (11) ◽  
pp. 3342-3351 ◽  
Author(s):  
Henrik Fanø Clausen ◽  
Rasmus Damgaard Poulsen ◽  
Andrew D. Bond ◽  
Marie-Agnes S. Chevallier ◽  
Bo Brummerstedt Iversen
Keyword(s):  
Solvothermal Synthesis ◽  
Terephthalic Acid ◽  
Metal Organic Framework ◽  
Dimethyl Formamide ◽  
Metal Organic ◽  
Organic Framework

A highly stable indium based metal organic framework for efficient arsenic removal from water

2018 ◽  
Vol 47 (3) ◽  
pp. 799-806 ◽  
Author(s):  
Hala Atallah ◽  
Mahmoud ELcheikh Mahmoud ◽  
Abdinoor Jelle ◽  
Alan Lough ◽  
Mohamad Hmadeh
Keyword(s):  
Solvothermal Synthesis ◽  
Arsenic Removal ◽  
Metal Organic Framework ◽  
Synthesis Process ◽  
Metal Organic ◽  
Organic Framework

Indium based metal organic framework crystals (AUBM-1) were successfully synthesized via a solvothermal synthesis process. SXRD analysis showed the production of a new In-MOF structure with a pts topology. AUBM-1 was shown to be chemically stable and was used as an adsorbent to efficiently remove arsenic from water.

scholarly journals The nanoscaled metal-organic framework ICR-2 as a carrier of porphyrins for photodynamic therapy

2018 ◽  
Vol 9 ◽  
pp. 2960-2967 ◽  
Author(s):  
Jan Hynek ◽  
Sebastian Jurík ◽  
Martina Koncošová ◽  
Jaroslav Zelenka ◽  
Ivana Křížová ◽  
...  
Keyword(s):  
Inorganic Chemistry ◽  
Photodynamic Therapy ◽  
Photophysical Properties ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Biological Applications ◽  
Nanoparticle Surface ◽  
Metal Organic ◽  
Unsaturated Metal Sites ◽  
First Time

Nanosized porphyrin-containing metal-organic frameworks (MOFs) attract considerable attention as solid-state photosensitizers for biological applications. In this study, we have for the first time synthesised and characterised phosphinate-based MOF nanoparticles, nanoICR-2 (Inorganic Chemistry Rez). We demonstrate that nanoICR-2 can be decorated with anionic 5,10,15,20-tetrakis(4-R-phosphinatophenyl)porphyrins (R = methyl, isopropyl, phenyl) by utilizing unsaturated metal sites on the nanoparticle surface. The use of these porphyrins allows for superior loading of the nanoparticles when compared with commonly used 5,10,15,20-tetrakis(4-carboxyphenyl)porphyrin. The nanoICR-2/porphyrin composites retain part of the free porphyrins photophysical properties, while the photodynamic efficacy is strongly affected by the R substituent at the porphyrin phosphinate groups. Thus, phosphinatophenylporphyrin with phenyl substituents has the strongest photodynamic efficacy due to the most efficient cellular uptake.

Metal–organic frameworks: a universal strategy towards super-elastic hydrogels

2019 ◽  
Vol 10 (18) ◽  
pp. 2263-2272 ◽  
Author(s):  
Huaizhi Liu ◽  
Hao Peng ◽  
Yumeng Xin ◽  
Jiuyang Zhang
Keyword(s):  
Drug Delivery ◽  
Mechanical Performance ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
High Loading ◽  
Loading Capacity ◽  
Metal Organic ◽  
First Time ◽  
Organic Framework

We reported for the first time using metal–organic framework (MOF) nanoparticles as effective nanofillers to significantly enhance the mechanical performance of hydrogels. The MOF hydrogels have been developed for drug delivery materials with high loading capacity and much extended drug releasing profiles.

Nanoarchitectured metal–organic framework/polypyrrole hybrids for brackish water desalination using capacitive deionization

2019 ◽  
Vol 6 (7) ◽  
pp. 1433-1437 ◽  
Author(s):  
Ziming Wang ◽  
Xingtao Xu ◽  
Jeonghun Kim ◽  
Victor Malgras ◽  
Ran Mo ◽  
...  
Keyword(s):  
Brackish Water ◽  
Metal Organic Framework ◽  
Water Desalination ◽  
Capacitive Deionization ◽  
Metal Organic ◽  
First Time ◽  
Organic Framework

Metal–organic framework/polypyrrole hybrids are synthesized and directly used in capacitive deionization for the first time.

scholarly journals Direct evidence of charge separation in a metal–organic framework: efficient and selective photocatalytic oxidative coupling of amines via charge and energy transfer

2018 ◽  
Vol 9 (12) ◽  
pp. 3152-3158 ◽  
Author(s):  
Caiyun Xu ◽  
Hang Liu ◽  
Dandan Li ◽  
Ji-Hu Su ◽  
Hai-Long Jiang
Keyword(s):  
Energy Transfer ◽  
Charge Separation ◽  
Oxidative Coupling ◽  
Direct Evidence ◽  
Metal Organic Framework ◽  
Metal Organic ◽  
First Time ◽  
Organic Framework

For the first time, the photoexcited charge separation in a metal–organic framework has been evidenced with clear ESR signals, based on efficient and selective photocatalytic oxidative coupling of amines.

Sequencing of metals in multivariate metal-organic frameworks

Science ◽  
2020 ◽  
Vol 369 (6504) ◽  
pp. 674-680 ◽  
Author(s):  
Zhe Ji ◽  
Tong Li ◽  
Omar M. Yaghi
Keyword(s):  
Metal Oxides ◽  
Atom Probe Tomography ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Molar Fraction ◽  
Atom Probe ◽  
Synthesis Temperature ◽  
Sequence Type ◽  
High Tolerance ◽  
Metal Organic

We mapped the metal sequences within crystals of metal-oxide rods in multivariate metal-organic framework–74 containing mixed combinations of cobalt (Co), cadmium (Cd), lead (Pb), and manganese (Mn). Atom probe tomography of these crystals revealed the presence of heterogeneous spatial sequences of metal ions that we describe, depending on the metal and synthesis temperature used, as random (Co, Cd, 120°C), short duplicates (Co, Cd, 85°C), long duplicates (Co, Pb, 85°C), and insertions (Co, Mn, 85°C). Three crystals were examined for each sequence type, and the molar fraction of Co among all 12 samples was observed to vary from 0.4 to 0.9, without changing the sequence type. Compared with metal oxides, metal-organic frameworks have high tolerance for coexistence of different metal sizes in their rods and therefore assume various metal sequences.

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