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Abstract <p>The influence of reaction parameters on the stabilization of nickel(II) ferrite hydrosols in the presence of polyethyleneimine (PEI) was studied by methods of mathematical planning and design of experiment (FFD 2<sup>7-4</sup>). The nickel(II) ferrite hydrosol, which retained sedimentation stability for 2 months, was prepared under optimal conditions. The NiFe<sub>2</sub>O<sub>4</sub>/Au hybrid material was prepared by adsorption of gold seeds on the magnetic particles followed by four-step reduction of Au(III) with hydroxylamine in the presence of PEI. According to transmission electron microscopy and X-ray photoelectron spectroscopy data, the material consisted of uniform spherical Au<sup>0</sup> nanoparticles of 4.0 ± 0.5 nm size uniformly distributed over the surface of ferrite nanoparticles of 9.7 ± 0.2 nm in diameter. Gold particles were strongly attached to the surface were not detached during post-synthetic and ultrasonic treatment. The content of gond particles can be adjusted by varying the number of gold reduction steps.</p>

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Synthesis of Stable NiFe2O4 and NiFe2O4/Au Hydrosols using Polyethyleneimine

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • S. V. Saikova,
  • D. I. Nemkova,
  • A. E. Krolikov

摘要

Abstract

The influence of reaction parameters on the stabilization of nickel(II) ferrite hydrosols in the presence of polyethyleneimine (PEI) was studied by methods of mathematical planning and design of experiment (FFD 27-4). The nickel(II) ferrite hydrosol, which retained sedimentation stability for 2 months, was prepared under optimal conditions. The NiFe2O4/Au hybrid material was prepared by adsorption of gold seeds on the magnetic particles followed by four-step reduction of Au(III) with hydroxylamine in the presence of PEI. According to transmission electron microscopy and X-ray photoelectron spectroscopy data, the material consisted of uniform spherical Au0 nanoparticles of 4.0 ± 0.5 nm size uniformly distributed over the surface of ferrite nanoparticles of 9.7 ± 0.2 nm in diameter. Gold particles were strongly attached to the surface were not detached during post-synthetic and ultrasonic treatment. The content of gond particles can be adjusted by varying the number of gold reduction steps.