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Powder structure of magnetic nanoparticles with a substituted pyrrole copolymer shells according to small-angle neutron scattering |
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| Authors: | V. I. Petrenko M. V. Avdeev R. Turcu A. Nan L. Vekas V. L. Aksenov L. Rosta L. A. Bulavin |
| Affiliation: | 1. Joint Institute for Nuclear Research, Dubna, Russia 2. Kyiv Taras Shevchenko National University, ul. Volodymyrska 64, 01601, Kyiv, Ukraine 3. National Research Centre “Kurchatov Institute”, pl. Kurchatova 1, Moscow, 123182, Russia 4. National Research Institute for Isotopic and Molecular Technologies, Cluj-Napoca, Donath St. 65-103, 400293, Cluj-Napoca, Romania 5. Center for Fundamental and Advanced Technical Research, Romanian Academy of Sciences, Timisoara Branch, Bd. Mihai Viteazul No. 24, 1900, Timi?oara, Romania |
| Abstract: | Powders of magnetic nanoparticles coated by biocompatible block copolymers (substituted pyrroles) are investigated by small-angle neutron scattering. It is found that the structure of the final precipitates depends on the type of stabilizing shell in the initial magnetic fluids. When dodecylbenzene sulfonic acid is used, separate polydisperse particles with a radius of gyration of 3–5 nm and an irregular surface (fractal dimension of 2.24) are observed in the final samples. For systems with lauric acid, additional scattering from a quasicrystalline structure with a characteristic correlation length of about 10 nm can be seen in the experimental spectra. The difference in the organization of the structure of the studied powders is related to a different polymer coating rate on the surface of the magnetic nanoparticles, which depends on the sorption properties of surfactants in the initial magnetic fluids. |
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