We have synthesized fusiform gold nanoparticles by recovering gold from a solution of gold nanoparticles obtained by dispersing of gold electrodes in hexane by pulsed plasm in liquid method. Formation of fusiform gold nanoparticles with length from 50 to 150 nm, and diameter of 5-15 nm was achieved by pulsed plasma in liquid method. Fusiform gold nanoparticles obtained by our method are different from the spindle-shaped gold nanoparticles which were synthesized from the growth solution, due to their loose structure, while spindle-shaped gold nanoparticles are dense and much larger in size (length 300-400 nm, diameter ~ 100-150 nm). In addition to this work, dumbbell-shaped magnetite/gold (Fe 3 O 4 / Au) nanoparticles were synthesized by using magnetite nanoparticles obtained in a cetylpyridinium bromide (CpyBr) solution with concentration of 0.1% and a gold nanosolution, where 0.1% sodium citrate solution was applied as a reducing agent. Our proposed method is characterized by the forming of discharge localization during the electrodes erosion process, simpler and does not require use of nuclei in the form of spherical gold nanoparticles and presence of growth solution. Fusiform gold nanoparticles were formed by simple reduction with sodium citrate from gold nano-solution.
Research relevance is the study of iron-containing nanocomposites based on humic substances is their special properties, composition, structure and applications. Materials and research methods: the article was compiled using a literature review of publications on iron-containing nanocomposites based on humic substances. Research objectives: determination of the structure and types of iron-containing nanocomposites based on humic substances and their field of application in medicine. Research results: Iron oxide nanoparticles are applicable in the development of nanomedicine due to their adaptable functions. Humic substances are composed of supramolecular heteropolymers, which include natural objects. Conclusions: Iron-containing nanocomposites can be used in biomedicine as diagnostic and therapeutic tools. Humic substances are organic macromolecules with multiple properties and high structural complexity.
Heteronuclear complexation in the Fe(II)–Fe(III)-Mn(II)CH3COOH-H2O system at 318 K and ionic strength of 1.0 mol/l was studied by the Clark-Nikolsky oxidation potential method. The formation of complexes of the composition: [FeL(H2O)5]2+; [FeLOH(H2O)4]+; [FeIIIМnIIL(H2O)3]4+; [FeIIIМnIIL(OH)2(H2O)9]2+; [FeL(H2O)5]+; [Fe(L)2(H2O)4]0; [Fe(L)(OH)2(H2O)3]-, two of which are heteronuclear. The conditions for forming and dominating coordination compounds in an aqueous solution are established.
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