Open Access Peer-reviewed Research Article

Magnetite nanoparticles coat around activated γ-alumina spheres: A case of novel protection of moisture-sensitive materials against hydration

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Typical TEM and SAED
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Submitted   Apr 24, 2019
Published   May 8, 2019
Issue    Vol 1 No 2 (2019)
DOI   10.25082/CR.2019.02.003

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Jaroslav Kupčík
Institute of Chemical Process Fundamentals of the Czech Academy of Sciences, Rozvojova 135, 16502 Prague 6, Czech Republic; Institute of Inorganic Chemistry of Czech Academy of Sciences, Husinec-Rez 1001, 250 68 Rez, Czech Republic
Petr Mikysek
Institute of Geology of the Czech Academy of Sciences, Rozvojová 269, 165 00 Praha 6, Czech Republic ; Institute of Geological Sciences, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
Dana Pokorná
Institute of Chemical Process Fundamentals of the Czech Academy of Sciences, Rozvojova 135, 16502 Prague 6, Czech Republic
Radek Fajgar
Institute of Chemical Process Fundamentals of the Czech Academy of Sciences, Rozvojova 135, 16502 Prague 6, Czech Republic
Petra Cuřínová
Institute of Chemical Process Fundamentals of the Czech Academy of Sciences, Rozvojova 135, 16502 Prague 6, Czech Republic
Karel Soukup
Institute of Chemical Process Fundamentals of the Czech Academy of Sciences, Rozvojova 135, 16502 Prague 6, Czech Republic
Josef Pola corresponding author
Institute of Chemical Process Fundamentals of the Czech Academy of Sciences, Rozvojova 135, 16502 Prague 6, Czech Republic

Abstract

Protection of various materials against hydration is of continuing interest to chemists and material scientists. We report on stabilization of porous surface of activated γ-alumina spheres (AAS) against hydration by an adhesive coat of nano-magnetite particles. The nano-Fe3O4-coated AAS were prepared in the ultrasound-agitated suspension of magnetite nanoparticles in heptane and were characterized by using X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM), BET surface area analysis and X-ray photoelectron spectroscopy (XPS). It is deduced that nanoparticle-alumina bonding interaction in non-polar organic solvent is enhanced by van der Waals attractive forces and that sonication induces changes in alumina morphology only in regions of contact between alumina and magnetite nanoparticles. The coated AAS submerged in still water avoid hydration and remain permeable by small gaseous (N2) molecules, while those soaked in moving water lose part of their coat and undergo hydration. The pristine and the coated AAS were briefly compared for their ability to degrade model antibiotics by using LC-MS analysis. It is confirmed that the degradation of trimethoprim is more efficient on the coated AAS. Our results are challenging for further research of Coulombic interactions between nano-particles and appropriate solid supports.

Keywords
protection against hydration, activated alumina, magnetite nanoparticles, Coulombic interaction, non-polar solvents

Article Details

How to Cite
Kupčík, J., Mikysek, P., Pokorná, D., Fajgar, R., Cuřínová, P., Soukup, K., & Pola, J. (2019). Magnetite nanoparticles coat around activated γ-alumina spheres: A case of novel protection of moisture-sensitive materials against hydration. Chemical Reports, 1(2), 67-76. https://doi.org/10.25082/CR.2019.02.003
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