Facile synthesis of nano-sized metal-organic frameworks, chromium-benzenedicarboxylate, MIL-101

Synthesis of ZIF-8 from recycled mother liquors

“…All conversion values were, however, below 40% after a crystallization period of 60 min, apparently the mother liquor contains substantial amount of unreacted Zn(NO 3 ) 2 and Hmim at the end of crystallization. The percent conversion increased with MeOH/Zn 2+ ratio, showing that dilute synthesis mixtures favor the formation of ZIF-8 [15]. Three different samples were synthesized from each composition; the error bars on the figure also show that the synthesis recipe is very reproducible.…”

“…On the other hand, the number of particles was calculated as 1.93 Â 10 14 /100-g-synthesis-mixture with MeOH/Zn 2+ ratio of 1043. Higher MeOH/Zn 2+ ratios denoting lower Zn 2+ and Hmim concentrations favor nucleation over crystal growth, resulting in smaller crystals [15,19,20].…”

Zeolitic Imidazolate Frameworks (ZIF): A Potential Membrane for CO2/CH4Separation

“…The surface of the seeds thus competes for supersaturation with the primary nuclei and stimulates the crystal growth, resulting in larger crystals; the higher molar ratio of MeOH: Zn 2+ formed smaller crystals. This was owing to the fact that, at lower concentration of Zn 2+ and Hmim, the nucleation rate was relatively larger than the crystal growth rate under the slightly supersaturated systems, thus forming smaller crystals (98). Hence, based on the literature, larger crystals can be synthesized using longer synthesis duration, higher pH of the solution in the presence of sodium formate at temperatures of 120 to 140 • C, and a lower molar ratio of MeOH: Zn 2+ .…”

Effect of the structural constituents of metal organic frameworks on carbon dioxide capture

“…Such progress towards the synthesis of amine containing MOFs is important due to the positive effect of amine groups and the availability of N atoms on CO 2 [44,45], Lanthanide MOFs [46], MIL-53 [47,48], CPO-27s [49] have all been synthesized in shorter periods of time, with smaller particle sizes and higher porosities than seen with conventional heating methods.…”