Role of Modulators in Controlling the Colloidal Stability and Polydispersity of the UiO-66 Metal-Organic Framework

ACS Applied Materials & Interfaces
William MorrisChad A Mirkin

Abstract

Nanoscale UiO-66 Zr6(OH)4O4(C8O4H4)6 has been synthesized with a series of carboxylic acid modulators, R-COOH (where R = H, CH3, CF3, and CHCl2). The phase purity and size of each MOF was confirmed by powder X-ray diffraction, BET surface area analysis, and scanning transmission electron microscopy (STEM). Size control of UiO-66 crystals from 20 nm to over 1 μm was achieved, and confirmed by STEM. The colloidal stability of each MOF was evaluated by dynamic light scattering and was found to be highly dependent on the modulator conditions utilized in the synthesis, with both lower pKa and higher acid concentration resulting in more stable structures. Furthermore, STEM was carried out on both colloidally stable samples and those that exhibited a large degree of aggregation, which allowed for visualization of the different degrees of dispersion of the samples. The use of modulators at higher concentrations and with lower pKas leads to the formation of more defects, as a consequence of terephthalic acid ligands being replaced by modulator molecules, thereby enhancing the colloidal stability of the UiO-66 nanoparticles. These findings could have a significant impact on nanoscale MOF material syntheses and applications, especially in...Continue Reading

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Citations

Feb 28, 2018·Chemical Communications : Chem Comm·Isabel Abánades LázaroRoss S Forgan
Jun 5, 2018·Advanced Materials·Shunzhi WangChad A Mirkin
Jun 8, 2018·Advanced Materials·Teresa Simon-YarzaChristian Serre
Apr 2, 2019·Chemical Communications : Chem Comm·Timothy C WangMark D Allendorf
Nov 27, 2019·Chemical Communications : Chem Comm·Pengfei YangJinlou Gu
Jul 3, 2020·Chemical Communications : Chem Comm·Panyapat PonchaiSareeya Bureekaew
May 26, 2020·Angewandte Chemie·Frederik HaaseStefan Wuttke
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Apr 29, 2021·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Alireza HashemzadehMasoud Mirzaei
Jun 8, 2021·Chemical Science·Checkers R MarshallCarl K Brozek
Apr 6, 2020·Chemical Science·Ross S Forgan
Jul 1, 2021·Inorganic Chemistry·Brittany L BonnettAmanda J Morris
Aug 4, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Isabel Abánades LázaroFrancisco G Cirujano
Sep 19, 2019·Journal of the American Chemical Society·Kaikai MaOmar K Farha
Dec 13, 2019·ACS Applied Materials & Interfaces·Hind MamloukSherzod T Madrahimov
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Jan 24, 2019·Journal of the American Chemical Society·Shunzhi WangOmar K Farha
May 30, 2021·Advanced Materials·Yu ShenFengwei Huo

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