Magnetite Nanoparticles in Hybrid Micelles of Polylactide- block -polyethylene Oxide and Sodium Dodecyl Sulfate in Water
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MATERIALS AND CERAMICS
Magnetite Nanoparticles in Hybrid Micelles of Polylactide-block-polyethylene Oxide and Sodium Dodecyl Sulfate in Water T. P. Loginovaa,*, V. V. Istratova, E. V. Shtykovaa,b, V. A. Vasneva, A. A. Matyushina,c, I. V. Shchetinina,d, E. A. Oleinichenkoa,e, and V. N. Talanovaa a Nesmeyanov
Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow, 117813 Russia Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,” Russian Academy of Sciences, Moscow, 119333 Russia c First Moscow State Medical University, Ministry of Public Health of the Russian Federation, Moscow, 119146 Russia d National Research Technological University “MISIS,” Moscow, 119049 Russia e Research Institute of Physicochemical Biology, Moscow State University, Moscow, 119992 Russia *e-mail: [email protected] b Shubnikov
Received December 18, 2017; revised February 22, 2018; accepted February 22, 2018
Abstract—Magnetite nanoparticles have been obtained in hybrid micelles of polylactide-block-polyethylene oxide (PL-b-PEO) and sodium dodecyl sulfate (SDS) in a one-stage process. Dynamic light scattering, transmission electron microscopy, and small-angle X-ray scattering data show that hybrid micelles form micellar associates, and the size of magnetite nanoparticles in hybrid micelles of the block-copolymer varies from 0.5 to 10 nm. The specific magnetization of solid samples has been measured. DOI: 10.1134/S1063774518060226
INTRODUCTION Researchers have paid much attention to amphiphilic block copolymers in the last decades [1–6]. The main feature of these compounds is their ability to form thermodynamically stable micellar solutions [7–9]. The use of amphiphilic block copolymers is one of the most efficient methods for stabilizing nanoparticles of metals and their oxides. Magnetite nanoparticles, entering the composition of water-soluble blockcopolymer nanocomposites, are applied to solve various biochemical and medical problems [10–13]]. Polylactide is applied in amphiphilic block copolymers because its destruction leads to the formation of metabolism natural products; this circumstance makes the polymer application in medicine and biotechnology especially attractive [14–19]. Another (among the most popular ones) material used in amphiphilic block copolymers is polyethylene oxide; it is characterized by water solubility and biocompatibility with biological objects [20–26]. In [15, 17, 19], magnetite nanoparticles were stabilized in polylactide-block-polyethylene oxide (PL-bPEO) and polyethylene oxide-poly(lactide-co-glycolide)-polyethylene oxide using low-molecular anion compounds: oleic acid and glutaric aldehyde. These stabilizers, on the one hand, form a monolayer
on the surface of magnetite nanoparticles and prevent their agglomeration and, on the other hand, make the particles hydrophobic. To eliminate this drawback, magnetite nanoparticles are subjected to lyophilization by oleylamine, Pluronik F-127, polyethylene oxide, etc. Note that the technique for forming these
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