Synthesis and magnetic characterizations of manganite-based composite nanoparticles for biomedical applications

Abstract

We report chemically synthesized highly crystalline lanthanum strontium manganite ͑LaSrMnO 3 ͒ and Eu-doped Y 2 O 3 and their composites. The synthesis yields nanoparticles of size 30-40 nm. Magnetic measurements performed on nanoparticles and composites show magnetic transition at about 370 K with a superparamagnetic behavior at room temperature. The ferromagnetic resonance studies of the nanoparticles show large linewidth due to surface strains. The composite nanoparticles also display luminescent behavior when irradiated with ultraviolet light. The manganites as well their composite with the luminescent nanoparticles may be very useful for biomedical applications.

Magnetic and luminescent properties of Fe/Fe3O4@Y2O3:Eu nanocomposites

“…The sur- face defects such as oxygen vacancies are modified as well, leading to the enhancement of photoluminescence [26]. To further prove the reproducibility of experimental results, the samples such as YVO 4 :Eu, YPO 4 :Eu, YBO 3 :Eu and other luminescent materials were also irradiated by UV light, the results are consistent with the results of Y 2 O 3 :Eu3%. Fig.…”

“…For instance, nanocomposites with both magnetic and fluorescent properties can be used in a wide range of applications in biological systems, such as targeted drug, diagnostic, therapeutics and bioimaging [1][2][3][4][5]. They can be controlled by an external magnetic field; they can also serve as luminescent phosphors.…”

Magnetic Properties of Interacting La0.67Sr0.33MnO3 Nanoparticles

“…Manganites with a typical composition La 0.67 Sr 0.33 MnO 3 (LSMO) are of interest in this context due to its high T C value (about 380 K) and a large magnetic moment at room temperature [15][16][17][18]. In this paper, we report on the preparation of nanoparticles of La 0.67 Sr 0.33 MnO 3 , with different particle size, by the solgel method.…”

Low temperature magnetic and transport properties of LSMO–PZT nanocomposites

“…Hence, one can achieve the selective heating of the given area of an organism by T c -limiting production of controlled heating effects by means of an alternating external magnetic field. 27 Though, in bulk LSMO, metal-insulator transition and ferromagnetic transition occurs simultaneously at the same temperature, in nanophasic La 0.7 Sr 0.3 MnO 3 both transition occurs at different temperatures and these values depend on sintering temperatures. 19 Ferromagnetic transition temperature decreases slightly with decreasing sintering temperature but metal-insulator transition decreases significantly with decreasing sintering temperature.…”