Chlorination As A Means For Changing The Composition Of Iron-Containing Nanoparticles In A Polyethylene Matrix, Pankratov D.A., Yurkov G.Yu., Astaf'ev D.A., Gubin S.P. //Russian Journal of Inorganic Chemistry. 2008. Т. 53. № 6. С. 933-942
Mössbauer spectroscopy, X-ray powder diffraction, and transmission electron microscopy were used to study the reactions of Fe3O4 or FeCl2·4H2O nanoparticles stabilized in a polyethylene (HPPE) matrix with gaseous chlorine and hydrogen chloride. These reactions produce FeCl2·2H2O nanoparticles, which retain the particle size and distribution over the HPPE matrix intrinsic to precursor nanoparticles. We propose chemical modification of iron-containing nanomaterials as a means for manufacturing iron(II) chloride nanoparticles.
The synthesis and study of various nanomaterials and their properties have recently become a focus of research due to their unique electronic, optical, magnetic, and other physical and chemical properties. The physical and chemical properties of nanomaterials are primarily determined by their chemical composition. Therefore, preparing materials containing nanoparticles of the desired chemical composition is a problem faced by researchers. A considerable number of processes are known to yield metal-containing nanoparticles: chemical, electrochemical, pyrolytic, spark, micellar, and mechanochemical .
The process used imposes limitations on the resultant material regarding its phase composition, purity, particle-size distribution, limiting concentration in the support, and the composition of the support. In this set of works, we propose a method for chemical modification of a nanocomposite in order to prepare nanoparticles of a different composition while retaining the other parameters (size, dispersion, distribution, matrix composition) of the precursor nanocomposite. This widens the spectrum of nanomaterials, removing some limitations for particular processes. In addition, it becomes possible to convert, via a simple chemical reaction, an available nanomaterial into another one that is more valuable but more difficult to manufacture.
Here, we consider the chemical conversion of iron-containing nanoparticles of various starting compositions enclosed in a polyethylene stabilizer matrix into iron(II) chloride nanoparticles by means of gaseous chlorine and hydrogen chloride. We also determine the physical and chemical properties of the resulting nanoparticles.
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In summary, nanoparticles embedded in a polyethylene matrix are accessible to gaseous chemical reagents; regardless of the history of the nanomaterial sample consisting of iron-containing nanoparticles stabilized in the bulk of HPPE, the reaction of nanoparticles with gaseous HCl produces only iron(II) chloride dihydrate; there is no considerable substance carryout during the reaction of nanoparticles with gaseous reagents; the nanoparticle size changes in accordance with their composition.