In the present study two sets of nanocomposites consisting of an epoxy resin and BaFeO or SrFeO nanoparticles were successfully developed and characterized morphologically and structurally via scanning electron microscopy and X-ray diffraction spectra. The dielectric response of the nanocomposites was investigated by means of broadband dielectric spectroscopy and their magnetic properties were derived from magnetization tests. Experimental data imply that the incorporation of the ceramic nanoparticles enhances significantly the dielectric properties of the examined systems and their ability to store electrical energy. Dielectric spectra of all systems revealed the presence of three distinct relaxation mechanisms, which are attributed both to the polymer matrix and the nanoinclusions: Interfacial polarization, glass to rubber transition of the polymer matrix and the re-orientation of small polar side groups of the polymer chain. The magnetic measurements confirmed the ferromagnetic nature of the nanocomposites. The induced magnetic properties increase with the inclusion of hexaferrite nanoparticles. The nanocomposites with SrFeO nanoparticles exhibit higher values of coercive field, magnetization, magnetic saturation and remanence magnetization. A magnetic transition was detected in the ZFC/FC curves in the case of the BaFeO/epoxy nanocomposites.
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http://dx.doi.org/10.3390/ma11122551 | DOI Listing |
ACS Appl Mater Interfaces
November 2024
Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, Nagatsuta-cho 4259-R3-6, Midori-ku, Yokohama-city, Kanagawa 226-8501, Japan.
The development of reusable solid catalysts based on naturally abundant metal elements for the liquid-phase selective oxidation of light alkanes under mild conditions to obtain desired oxygenated products, such as alcohols and carbonyl compounds, remains a challenge. In this study, various perovskite oxide nanoparticles were synthesized by a sol-gel method using aspartic acid, and the effects of A- and B-site metal cations on the liquid-phase oxidation of isobutane to -butyl alcohol with molecular oxygen as the sole oxidant were investigated. Iron-based perovskite oxides containing Fe such as BaFeO, SrFeO, and LaSrFeO exhibited catalytic performance superior to those of other Fe- and Fe-based iron oxides and Mn-, Ni-, and Co-based perovskite oxides.
View Article and Find Full Text PDFJ Phys Condens Matter
September 2024
PG and Research Department of Physics, National College (Autonomous), Affiliated to Bharathidasan University, Tiruchirappalli 620 001, Tamil Nadu, India.
The SrFeOnanoparticles doped with 5% and 10% Gd were synthesized using the solution combustion method. The phase formation of the synthesized nanoparticles was confirmed by powder x-ray diffraction analysis. Field emission scanning electron microscope and HRTEM were employed to examine the morphology of the samples, revealing well-ordered, agglomerated nanoparticles.
View Article and Find Full Text PDFJ Hazard Mater
October 2022
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, People's Republic of China; College of Environment, Hohai University, Nanjing 210098, People's Republic of China.
In recent years, many efforts have been made to modulate the interaction between carriers and nanoparticles under the integrity of the active site structure. Herein, SrFeO @CoSe nanocomposite was fabricated by loading CoSe onto SrFeO particles with a perovskite structure in the form of an encapsulation. The optimized SFO@CS-0.
View Article and Find Full Text PDFACS Appl Mater Interfaces
July 2018
Department of Molecular Engineering, Graduate School of Engineering , Kyoto University, Kyotodaigaku Katsura, Nishikyo-ku , Kyoto 615-8510 , Japan.
Environmental catalysts are required to operate highly efficiently under severe conditions in which they are exposed to reductive and oxidative atmospheres at high temperatures. This study demonstrates that SrFeTi O-supported Pd catalysts exhibit high catalytic activities for NO reduction with CH and CO in the presence of O, which is a model reaction for the purification of automotive exhaust gases. Catalytic activity is enhanced with increasing Ti content, and the highest activity is observed for Pd/SrFeTiO among the examined catalysts.
View Article and Find Full Text PDFPhys Chem Chem Phys
May 2017
Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyotodaigaku Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
This study proves that a small amount of Pd loading (1 wt%) on SrFeO can dramatically enhance the oxygen-storage properties of SrFeO. The topotactic oxygen intake and release between SrFeO and SrFeO takes place in response to gas switching between an O flow and H flow, regardless of the presence or absence of Pd loading. The effect of Pd loading is significant for the oxygen-release process under H atmosphere; that is, highly dispersed Pd metal nanoparticles sized less than 1 nm formed on Pd/SrFeO to promote H dissociation, resulting in the improvement of the oxygen-release temperature and rate.
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