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

SYSNO ASEP	0504733
Document Type	J - Journal Article
R&D Document Type	The record was not marked in the RIV
Subsidiary J	Ostatní články
Title	Magnetite nanoparticles coat around activated -alumina spheres: A case of novel protection of moisture-sensitive materials against hydration.
Author(s)	Kupčík, Jaroslav (UCHP-M)_{RID, ORCID, SAI} Mikysek, Petr (GLU-S)_{SAI, ORCID} Pokorná, Dana (UCHP-M)_{RID, SAI} Fajgar, Radek (UCHP-M)_{RID, ORCID, SAI} Cuřínová, Petra (UCHP-M)_{RID, SAI, ORCID} Soukup, Karel (UCHP-M)_{RID, SAI, ORCID} Pola, Josef (UCHP-M)_{RID, ORCID, SAI}
Source Title	Chemical Reports. - : SyncSci Publishing - ISSN 2591-7943 Roč. 1, č. 2 (2019), s. 67-76
Number of pages	10 s.
Language	eng - English
Country	SG - Singapore
Keywords	protection against hydration ; activated alumina ; magnetite nanoparticles
Subject RIV	CF - Physical ; Theoretical Chemistry
OECD category	Physical chemistry
Subject RIV - cooperation	Institute of Geology - Analytical Chemistry, Separation
R&D Projects	TA04020860 GA TA ČR - Technology Agency of the Czech Republic (TA ČR)
Institutional support	UCHP-M - RVO:67985858 ; GLU-S - RVO:67985831
DOI	10.25082/CR.2019.02.003
Annotation	Protection of various materials against hydration is of continuing interest to chemists and material scientists. We report on stabilization of porous surface of activated -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.
Workplace	Institute of Chemical Process Fundamentals
Contact	Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227
Year of Publishing	2020

Number of the records: 1