Metal-substituted cobalt ferrites [MxCo(1-x)Fe2O4(M=Zn,Cu,Mn;x=0.0,0.25,0.5,and 0.75)]were synthesized via a sol-gel technique.The ferrite structures were confirmed by X-ray diffraction, Fourier transform infrared spe...Metal-substituted cobalt ferrites [MxCo(1-x)Fe2O4(M=Zn,Cu,Mn;x=0.0,0.25,0.5,and 0.75)]were synthesized via a sol-gel technique.The ferrite structures were confirmed by X-ray diffraction, Fourier transform infrared spectroscopy,scanning electron microscopy,surface analysis using the Brunauer-Emmett-Teller method,and energy-dispersive X-ray spectroscopy.Antimicrobial activity of these ferrites against selected pathogenic microbes was determined.The structures remained cubic spinel phases after substitution of metals.Substitution strongly influenced the microstructure and homoge- neous grain distribution.The particle size of the ferrites increased linearly with increase in their annealing temperature.The surface area of zinc cobalt ferrite nanoparticles (ZCFO)was 52.56m^2/g,the average pore size was 1.84nm,and pore volume was 0.136mL/g.All ferrites showed antimicrobial activity toward all pathogens selected.Of these,the most powerful was ZCFO,showing zones of inhibition of 13.0mm against Bacillus subtilis and Staphylococcus aureus and 12.0mm against Candida albicans.Gamma-irradiated ZCFO nanoparticles (150.0kGy)maintained higher antimicrobial activity than non-irradiated particles,e.g. being active toward S.aureus (16.0mm).ZCFO is proposed as a candidate material for industrial and biomedical purposes.展开更多
文摘Metal-substituted cobalt ferrites [MxCo(1-x)Fe2O4(M=Zn,Cu,Mn;x=0.0,0.25,0.5,and 0.75)]were synthesized via a sol-gel technique.The ferrite structures were confirmed by X-ray diffraction, Fourier transform infrared spectroscopy,scanning electron microscopy,surface analysis using the Brunauer-Emmett-Teller method,and energy-dispersive X-ray spectroscopy.Antimicrobial activity of these ferrites against selected pathogenic microbes was determined.The structures remained cubic spinel phases after substitution of metals.Substitution strongly influenced the microstructure and homoge- neous grain distribution.The particle size of the ferrites increased linearly with increase in their annealing temperature.The surface area of zinc cobalt ferrite nanoparticles (ZCFO)was 52.56m^2/g,the average pore size was 1.84nm,and pore volume was 0.136mL/g.All ferrites showed antimicrobial activity toward all pathogens selected.Of these,the most powerful was ZCFO,showing zones of inhibition of 13.0mm against Bacillus subtilis and Staphylococcus aureus and 12.0mm against Candida albicans.Gamma-irradiated ZCFO nanoparticles (150.0kGy)maintained higher antimicrobial activity than non-irradiated particles,e.g. being active toward S.aureus (16.0mm).ZCFO is proposed as a candidate material for industrial and biomedical purposes.
