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

    Year: 2019

    Journal: Beilstein J. Nanotechnol., Volume 10, 1-Mar, page 654–665

    Authors: Andres, Miguel A.; Sicard, Clemence; Serre, Christian; Roubeau, Olivier; Gascon, Ignacio

    Organizations: European Union Seventh Framework Programme (FP7/2007-2013) [608490]; Spanish MINECO; FEDEREuropean Union (EU) [MAT2016-78257-R, MAT2017-86826-R]; Aragon Government (DGA)Gobierno de Aragon; ESF [E31_17R]; Ministerio de Educacion from the Spanish Government under a FPU grant (Formacion de Profesorado Universitario)German Research Foundation (DFG)

    Keywords: hydrophobic coating; Langmuir-Blodgett (LB) films; metal organic framework (MOF); surface modification; UiO-66-COOH(Zr)

    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 approximate to 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 degrees. 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.
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