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

Journal Article · · ACS Applied Materials and Interfaces

We report 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 the areas of catalysis and drug delivery.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
US Air Force Office of Scientific Research (AFOSR); US Army Research Office (ARO); US Department of the Navy, Office of Naval Research (ONR); Defense Threat Reduction Agency (DTRA); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FA9550-14-1-0274; W911NF-15-1-0151; N00014-15-1-0043; AC02-06CH11357
OSTI ID:
1418044
Journal Information:
ACS Applied Materials and Interfaces, Vol. 9, Issue 39; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 151 works
Citation information provided by
Web of Science

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Cited By (20)

Get the light out: nanoscaling MOFs for luminescence sensing and optical applications journal January 2019
Enhancing anticancer cytotoxicity through bimodal drug delivery from ultrasmall Zr MOF nanoparticles journal January 2018
Controlled Nucleation and Controlled Growth for Size Predicable Synthesis of Nanoscale Metal-Organic Frameworks (MOFs): A General and Scalable Approach journal May 2018
Multivariate Modulation of the Zr MOF UiO‐66 for Defect‐Controlled Combination Anticancer Drug Delivery journal February 2020
Metal-Organic Framework Nanoparticles journal June 2018
Selective Separation of Isomeric Dicarboxylic Acid by the Preferable Crystallization of Metal-Organic Frameworks journal December 2018
The impact of crystal size and temperature on the adsorption-induced flexibility of the Zr-based metal–organic framework DUT-98 journal January 2019
Photodynamic Therapy Based on Nanoscale Metal-Organic Frameworks: From Material Design to Cancer Nanotherapeutics journal October 2018
Multivariate Modulation of the Zr MOF UiO‐66 for Defect‐Controlled Combination Anticancer Drug Delivery journal March 2020
Nanoscale Zr-Based MOFs with Tailorable Size and Introduced Mesopore for Protein Delivery journal February 2018
Nanoparticles of Metal-Organic Frameworks: On the Road to In Vivo Efficacy in Biomedicine journal June 2018
The Chemistry of Reticular Framework Nanoparticles: MOF, ZIF, and COF Materials journal February 2020
Metal–organic framework tethering pH- and thermo-responsive polymer for ON–OFF controlled release of guest molecules journal January 2020
Synthesis of novel mesoporous sulfated zirconia nanosheets derived from Zr-based metal–organic frameworks journal January 2020
Green separation of rare earth elements by valence-selective crystallization of MOFs journal January 2019
Controlling interpenetration through linker conformation in the modulated synthesis of Sc metal-organic frameworks text January 2018
The impact of crystal size and temperature on the adsorption-induced flexibility of the Zr-based metal-organic framework DUT-98 text January 2019
Controlled Nucleation and Controlled Growth for Size Predicable Synthesis of Nanoscale Metal-Organic Frameworks (MOFs): A General and Scalable Approach journal May 2018
Chemical Control over Nucleation and Anisotropic Growth of Two-Dimensional Covalent Organic Frameworks journal September 2019
Engineering a Highly Defective Stable UiO-66 with Tunable Lewis- Brønsted Acidity: The Role of the Hemilabile Linker journal January 2020

Figures / Tables (6)


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