The chemical compositions, structures, and electrokinetic potentials have been studied for silver-containing Janus-type ZnO/Ag nanoparticles, heterophase Cu/Ag nanoparticles with a uniform ...distribution of the components over a particle, and silver-decorated TiO
2
nanoparticles. The nanoparticles have been obtained by the simultaneous electric explosion of two wires. The influence of nanoparticle surface structure on the isoelectric point position and electrokinetic potential values has been analyzed. The effect of silver localization on the electrokinetic characteristics of nanoparticles has been investigated. These characteristics have been compared with those of mechanical mixtures having the same mass ratios of the components.
Bimetallic Al–Cu and Al–Ag nanoparticles were synthesized by electric explosion of wires in an argon atmosphere. The mass ratio of aluminum and the second metal (Me = Cu or Ag) was ~ 90 : 10 and was ...controlled by the diameter of the dispersed metal wires. Mesoporous AlOOH–Me nanocomposite was obtained by simple oxidation of Al–Me precursors with water at a temperature of 60°С. The kinetic regularities of the oxidation of Al–Me nanoparticles in dilute aqueous suspensions were studied. The effect of the second metal on the structure, morphology, and antibacterial activity of nanocomposites against methicillin-resistant
Staphylococcus aureus
(MRSA) bacteria was studied. It has been shown that the synthesized AlOOH–Me nanocomposites possess high antibacterial activity and are promising and highly efficient antimicrobial agents.
In the present work, we have synthesized for the first time zinc titanate nanoparticles by electrical explosion of titanium and zinc wires in an oxygen-containing atmosphere (argon–oxygen 20 vol.%). ...As-synthesized nanoparticles were characterized using transmission electron microscopy, x-ray diffraction analysis, and x-ray photoelectron spectroscopy. The particles have spherical shapes and an average particle size of 82 nm. The phase composition is presented by zinc titanate and a small amount of titanium oxide, which corresponds to the phase diagram of the TiO
2
–ZnO system. The photocatalytic activity of the synthesized nanoparticles studied in the decomposition reaction of model dye methylene blue was higher than that of titanium oxide nanoparticles obtained by electrical explosion of a titanium wire in an oxygen-containing atmosphere. In addition, the synthesized nanoparticles demonstrated high antibacterial activity against methicillin-resistant staphylococcus aureas (MRSA) bacteria.
The CuFe2O4/CuO/Cu2O nanoparticles at the first time have been synthesized by the simultaneous electric explosion of twisted iron and copper wires in an oxygen-containing atmosphere at different ...copper to iron atomic ratios. The use of nanoparticles with a maximum content of CuFe2O4 as a photocatalyst can reduce the concentration of Congo Red dye in solution by 72% in 60 min at visible light irradiation. Moreover, these nanoparticles exhibited excellent antibacterial activity against MRSA ATCC 43300. The antibacterial activity of the samples is in good agreement with the data on the photocatalytic activity of nanoparticles. This shows that the main mechanism of composite nanoparticles action is based on ROS generation. This study showed that electrical explosion of the metal wires is an attractive method for the synthesis of complex oxides with high photocatalytic and antibacterial activity.
In the present study, we obtained antibacterial Fe-Cu and Fe-Ag bimetallic nanoparticles by electrical explosion of two twisted wires. This method allows obtaining nanoparticles of a given ...composition and morphology. As-synthesized nanoparticles were characterized by electron microscopy, X-ray diffraction, micro electrophoresis techniques and magnet technique. In result we observed the formation of nanoparticles with Janus-like structure with distinct separation of components inside the particle. These nanoparticles have a strong antibacterial activity against two bacteria strains. The high antimicrobial activity of the nanoparticles is due to the prolonged ion release in media. Taking into account the possibility of easy magnetic separation of the novel bimetallic demonstrate the potential for their use as promising new generation antibacterial agents for advanced antimicrobial water treatment technologies.
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•Bimetal Cu/Fe nanoparticles were synthesized by the electrical EEW.•Cu/Fe nanoparticles mostly have «Janus» particle morphology.•Cu/Fe nanoparticles exhibit higher anti-bacterial ...effect.
The search of new efficient antibacterial agents for biomedical applications is subject of researchers special attention. Bimetallic nanoparticles containing biologically active metals are prospective antibacterial agents. The «Janus»-like Cu/Fe nanoparticles prepared by electrical explosive of wires were found to exhibit high antibacterial activity comparable with that of Ag nanoparticles and exceed the antibacterial activity of Fe and Cu monometallic nanoparticles and their mixture. MIC values of bimetallic Cu/Fe particles are 3.91–250 µg/ml. This strong antibacterial activity is due to the synergistic bactericidal Cu2+ and Fe3+ ions released from Cu/Fe bimetallic nanoparticles. Cu/Fe nanoparticles are a promising material for antibacterial protection technologies and for fighting drug-resistant bacterial strains.
The possibility of the synthesis of bimetallic Janus nanoparticles from immiscible metals Ta and Cu by the method of electric explosion of two conductors in an argon atmosphere has been shown. ...Consolidation of Ta–Cu nanoparticles and spark plasma sintering yielded a composite material with a high microhardness and compressive strength, but a relatively low bending strength. The Ta–Cu composite inhibits the viability of bacteria
Escherichia coli
and
Staphylococcus aureus
with an efficiency of 99.99% owing to the slow release of small concentrations of Cu
2+
ions. The synthesized composite material with high antibacterial activity for a long time is promising for the technologies of modern regenerative medicine.
The thermally and chemically stable TiO
2
nanoparticles possessing a wide bandgap and a low toxicity are the most frequently used photocatalysts for decomposition of organic substances. However, a ...high rate of recombination of electron-hole pairs and a high energy of photoactivation significantly limit their applications. Modification of TiO
2
with silver promotes surface charge separation and increases their photochemical activity. In the present study, the TiO
2
–Ag bicomponent nanoparticles are prepared by an electric explosion of metal wires in the atmosphere of 85 vol.% Ar – 15 vol.% O
2
. This method demonstrates a high production rate (170–200 g/h) quite sufficient for their large-scale manufacturing. However, electroexplosive nanoparticles are mostly agglomerates having sizes within 200–500 nm, which significantly reduces their photochemical activity in the test decomposition reaction of the model dye methylene blue under the visible light. It is shown that an ultrasonic treatment of the TiO
2
–Ag nanoparticles in an aqueous suspension for 15 min provides a 10% increase in their photochemical activity.
Bulk samples with high mechanical strength reaching 1000 MPa were obtained from electroexplosive Fe-Fe3O4 nanoparticles containing 81 wt. % Fe. Maximum strength is achieved by consolidation of the ...nanoparticles by isostatic pressing followed by vacuum sintering at 700 °C. A further increase in the sintering temperature leads to the formation of large pores with a size of up to 5 μm and an intense interaction of Fe and Fe3O4 with the formation of FeO leading to the embrittlement of the samples and a decrease in their strength. The degradation rate of Fe- Fe3O4 samples in NaCl (0.9% wt.) and Hank's solution is 7 times higher than that of samples obtained by sintering an electroexplosive Fe nanopowder under the same conditions.
Fe-Fe3O4 nanopowders; Electrical explosion of wire; Bioresorbable composites; Sintering; Corrosion; Strength.
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