Steric stabilization and functionalization of magnetite particles and preparation of colloid magnetite dispersions in oligomeric media

Лысенко, С. Н.; Yakushev, R. M.; Стрельников, В. Н.; Gabdrakhimova, Yu. I.; Борисова, И. В.

doi:10.1134/s1070427210080136

Cited by 2 publications

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References 2 publications

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“…Surfactants with low molecular weights include oleic, 26 linoleic 27 and other fatty acids, or their sodium, potassium and ammonium salts, [28][29][30][31][32] and sulfonated calixarenes. 33 High molecular weight stabilizers, such as synthetic polymers, [34][35][36] including polyvinyl alcohol, 37 polyacrylic acid, 38 polymethacrylic acid, 39 the three-block copolymer PEO-COOH-PEO, 40 the copolymer of acrylic, and p-vinylbenzenesulfonic and vinylsulfonic acids, 41 can be used to stabilize the colloidal particles of MFs. In addition, natural or modi¯ed biopolymers, such as dextran, 42,43 alginic acid, 44 humic acids 45 and lignosulfonates (LS), [46][47][48] including nitrosated LS, 49,50 are used as stabilizers.…”

Section: Introductionmentioning

confidence: 99%

Using Nitrated Lignosulfonates for the Synthesis of a Water-Based Magnetic Fluid

et al. 2019

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Nitrated lignosulfonates were used to synthesize a water-based magnetic fluid. Lignosulfonates were nitrated by nitric acid under mild conditions and without further purification were used to synthesize a magnetic fluid. Part of the iron(II) were oxidized with an excess of nitric acid, so that the magnetoactive phase under the condensation by action of sodium hydroxide was formed. Optimum conditions for nitration of lignosulfonates and synthesis of a magnetic fluid were experimentally established. The optimum consumption of iron(II) was 1.3–1.5[Formula: see text]g per 1[Formula: see text]g of sodium lignosulfonate. Unlike the initial lignosulfonates, nitrated lignosulfonates have peptizing properties, due to which the precipitate formed during condensation was dispersed to nanoparticles (15–30[Formula: see text]nm). The resulting magnetic fluid had a high magnetic activity and was stable for a long time.

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Section: Introductionmentioning

confidence: 99%

Using Nitrated Lignosulfonates for the Synthesis of a Water-Based Magnetic Fluid

et al. 2019

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μSR-Study of a 3% CoFe2O4 Nanoparticle Concentration Ferrofluid

et al. 2021

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Magnetic fluids based on single-domain magnetic spinel ferrite nanoparticles dispersed in various liquid media are of particular practical and scientific interest. This paper presents a muon spectroscopy study of a ferrofluid based on magnetic nanoparticles of CoFe2O4 molecules dispersed in water (H2O) with a nanoparticle concentration of 3%. In this study, it was determined that the structure and magnitude of the magnetization of a ferrofluid depend on the viscosity of the liquid itself. It was shown that, at room temperature (290 K) and under an external magnetic field of 527 G, the observed additional magnetization was ~20 G. In a small fraction of the sample under study (~20%), negative magnetization (diamagnetism) was observed. At low temperatures (~30 K), the sample acted as a paramagnet in a magnetic field. For the first time, the magnetic field inside and in the immediate vicinity of a CoFe2O4 nanoparticle has been measured experimentally using the μSR method: the value was 1.96 ± 0.44 kG; thus, direct measurement of the magnetization of a nanoscale object was performed.

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Steric stabilization and functionalization of magnetite particles and preparation of colloid magnetite dispersions in oligomeric media

Cited by 2 publications

References 2 publications

Using Nitrated Lignosulfonates for the Synthesis of a Water-Based Magnetic Fluid

Using Nitrated Lignosulfonates for the Synthesis of a Water-Based Magnetic Fluid

μSR-Study of a 3% CoFe2O4 Nanoparticle Concentration Ferrofluid

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