Field-Flow Fractionation in a Rotating Coiled Column in the Development of Reference Samples of Natural Nanoparticles

Autor:	A. I. Ivaneev, Petr S. Fedotov, Mikhail S. Ermolin
Rok vydání:	2021
Předmět:	Field flow fractionation Scanning electron microscope Muscovite chemistry.chemical_element Nanoparticle engineering.material Analytical Chemistry chemistry.chemical_compound Montmorillonite chemistry Chemical engineering Aluminium engineering Kaolinite Inductively coupled plasma
Zdroj:	Journal of Analytical Chemistry. 76:1098-1105
ISSN:	1608-3199 1061-9348
DOI:	10.1134/s1061934821090045
Popis:	The study of the properties and composition of natural nanoparticles is an essential problem in analytical chemistry. Currently, there are no reference samples of natural nanoparticles, which complicates the study of the role of nanoparticles in specific processes, including geochemical ones, and makes it almost impossible to compare the results obtained by different researchers. In this work, nanoparticles of kaolinite, montmorillonite, and muscovite are studied as potential reference samples of natural nanoparticles. A complex of analytical methods has been proposed for the isolation and characterization of mineral nanoparticles, including the field flow fractionation of particles in a rotating coiled column, laser diffraction, scanning electron microscopy, and inductively coupled plasma atomic emission spectrometry. According to laser diffraction data, 93–98% of the isolated particles are from 40 to 300 nm in size; 2–7% of particles have sizes of up to 830 nm. The sizes of the isolated particles were confirmed by scanning electron microscopy. Based on the aluminum content, the concentrations of mineral nanoparticles in the isolated suspensions were estimated. The aggregation stability of nanoparticles in 5 mM phosphate buffer solutions of pH 6, 7, and 8 was studied. Muscovite nanoparticles are stable at pH 7 and 8 for at least 4 weeks, while montmorillonite nanoparticles have similar stability only at pH 8. For kaolinite nanoparticles, significant aggregation was observed at all studied pH values of buffer solutions. The obtained experimental results made it possible to clarify the problems and assess the prospects for developing reference samples of natural nanoparticles.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4c70155f8c6bb009481989ffd184e062 https://doi.org/10.1134/s1061934821090045 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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