Physical–Chemical Properties of Magnetite Nanoparticles Doped …
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was provided not only with coming out of ferrous cations from composite structures
but with catalytic activity of noble metal’s shell.
Moreover, aurum-containing nanocomposites are characterized by the specific
optical (bioplasmonic) properties. In particular, water sols of Fe 3 O 4 and Au
0 exerted
the fluorescence peaks in the area of 563 and 659 nm when they were exposed by the
wideband light source at 500–650 nm. The following optical phenomenon appears
as an effect of action on plasmons of individual particles and their associates that
included a few particles as well. Such structures move of the peak to far-red—nearinfrared light diapason that is the most permeable for biological tissues. So, the
optical properties of nanocomposites open the perspectives for photodynamic and
photothermal effects of the composite particles on tumorous tissues.
4 Conclusion
1. The contact of the steel 3 surface with the air and water solutions containing
argentum and aurum aquaforms under the rotation–corrosion dispergation (RCD)
conditions leads to the formation two-phase system that includes magnetite doped
with Ag(I) or Au(III) cations and lepidocrocite. At the same time, the nanoparticles of core and shell-type nanocomposites are the typical products collected in
the sols within the RCD process.
2. The general characteristics of the products of the phase formation process are the
following. Whereas the particle size for both systems varies from 19 to 24 nm,
the content of noble metals in the chemical composition of magnetite particles
depends on their initial concentration and changes from 0.2 to 1.8 wt% for Ag
and from 0.05 to 0.9 wt% for Au. According to a magnetic study, all samples
do not show remanence magnetization and coercitivity. The shape of hysteresis
loops is typical for superparamagnetics.
3. The preliminary investigation shows the row of the possible application of asprepared nanoparticles to target the supply of pharmaceuticals and therapy of
various pathological states accompanied by the oxidative injuries of cells and
bio-tissues.
References
1. Zhichuan X, Yanglong H, Shouheng S (2007) Magnetic core/shell Fe 3 O 4 /Au and Fe 3 O 4 /Au/Ag
nanoparticles with tunable plasmonic properties. J Am Chem Soc 129:8698–8699
2. Hoskins C, Min Y, Gueorguieva M et al (2012) Hybrid gold-iron oxide nanoparticles as a
multifunctional platform for biomedical application. J Nanobiotechnol. 10: 27. https://doi.org/
10.1186/1477-3155-10-27
3. Muniz-Miranda M, Gellini C, Giorgetti E, Margheri G (2017) Bifunctional Fe 3 O 4 /Ag
nanoparticles obtained by two-step laser ablation in pure water. J Colloid Interf Sci 489:100–105
555
was provided not only with coming out of ferrous cations from composite structures
but with catalytic activity of noble metal’s shell.
Moreover, aurum-containing nanocomposites are characterized by the specific
optical (bioplasmonic) properties. In particular, water sols of Fe 3 O 4 and Au
0 exerted
the fluorescence peaks in the area of 563 and 659 nm when they were exposed by the
wideband light source at 500–650 nm. The following optical phenomenon appears
as an effect of action on plasmons of individual particles and their associates that
included a few particles as well. Such structures move of the peak to far-red—nearinfrared light diapason that is the most permeable for biological tissues. So, the
optical properties of nanocomposites open the perspectives for photodynamic and
photothermal effects of the composite particles on tumorous tissues.
4 Conclusion
1. The contact of the steel 3 surface with the air and water solutions containing
argentum and aurum aquaforms under the rotation–corrosion dispergation (RCD)
conditions leads to the formation two-phase system that includes magnetite doped
with Ag(I) or Au(III) cations and lepidocrocite. At the same time, the nanoparticles of core and shell-type nanocomposites are the typical products collected in
the sols within the RCD process.
2. The general characteristics of the products of the phase formation process are the
following. Whereas the particle size for both systems varies from 19 to 24 nm,
the content of noble metals in the chemical composition of magnetite particles
depends on their initial concentration and changes from 0.2 to 1.8 wt% for Ag
and from 0.05 to 0.9 wt% for Au. According to a magnetic study, all samples
do not show remanence magnetization and coercitivity. The shape of hysteresis
loops is typical for superparamagnetics.
3. The preliminary investigation shows the row of the possible application of asprepared nanoparticles to target the supply of pharmaceuticals and therapy of
various pathological states accompanied by the oxidative injuries of cells and
bio-tissues.
References
1. Zhichuan X, Yanglong H, Shouheng S (2007) Magnetic core/shell Fe 3 O 4 /Au and Fe 3 O 4 /Au/Ag
nanoparticles with tunable plasmonic properties. J Am Chem Soc 129:8698–8699
2. Hoskins C, Min Y, Gueorguieva M et al (2012) Hybrid gold-iron oxide nanoparticles as a
multifunctional platform for biomedical application. J Nanobiotechnol. 10: 27. https://doi.org/
10.1186/1477-3155-10-27
3. Muniz-Miranda M, Gellini C, Giorgetti E, Margheri G (2017) Bifunctional Fe 3 O 4 /Ag
nanoparticles obtained by two-step laser ablation in pure water. J Colloid Interf Sci 489:100–105