Abstract: Ferrofluids, stable colloids of ferro- and ferrimagnetic nanoparticles that do not aggregate and sediment under gravity, electrostatic or magnetic forces are important types of artificial “smart nanofluids” [1]. Many approaches to synthesize ferrofluids have been reported so far. Generally they can be divided into two categories of one-step and two-step processes. While two-step methods became popular due to the variety of the viable synthesis processes at industrial scale [2], one step methods allow one to simplify the synthesis route and get rid of different steps including drying, storage, transportation, and dispersion procedures. However it’s difficult to get ferrofluids with desired structure, size characteristics and magnetic properties using one stage approach. To find an effective synthetic method it’s necessary to study the initial stages of colloid formation. New facile one step synthesis of few nanometers Fe3O4 particles colloid was suggested in the Boreskov Institute of Catalysis based on the modification of co-precipitation method [3] proceeding in surfactant like environment. The method allows one to get ferrofluids based on Fe3O4 nanoparticles with narrow size distribution that show superparamagnetic behavior at room temperature. The electron spin resonance (ESR) method was applied to investigate the initial stages of the colloid formation. The magnetic structure of few-nanometer sized nanoparticles interrelates strongly with its structure, surface state and magnetic interparticle interactions [4,5]. Here we report the results of ESR study of Fe3O4 ferrofluid. The special attention is paid to the initial stages of magnetic nanoparticles ensemble formation

Cite: Yakushkin S. , Kirillov V. , Martyanov O.
ESR as a Unique Tool to Study Initial Stages of Ferrofluid Synthesis
In compilation III International Conference "Spin Physics, Spin Chemistry, Spin Technology (SPCT-2018)": Book of Abstracts. – N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry., 2018. – C.83.

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