Hyperthermia studies of ferrite nanoparticles synthesized in the presence of cotton
Hyperthermia studies of ferrite nanoparticles synthesized in the presence of cotton
复制标题
在棉花存在下合成的铁氧体纳米颗粒的热研究
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
M. D. Carvalho
中科院分区：
文献类型：
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作者：
S. G. Mendo;André F. Alves;L. Ferreira;M. Cruz;M. H. Mendonça;M. Godinho;M. D. Carvalho
MFe2O4（M = Co、Fe、Mn）化合物是在药用棉存在下通过水热处理合成的。每种组合物制备了两组纳米颗粒，随后通过 XRD、TEM 和 SEM 进行表征。从溶液中获得的纳米颗粒显示出预期的尖晶石结构和不同的平均尺寸（低于 16 nm）；嵌入棉花中的纳米粒子经过煅烧过程以消除棉花。对于这些煅烧样品，CoFe2O4 保持了尖晶石结构，M = Mn 样品确定了混合相，对于铁，磁铁矿相转化为赤铁矿 (α-Fe2O3)。消除棉花后，样品表现出的形态证明了棉花作为模板的作用。为了评估热疗纳米颗粒的质量，使用 SQUID 磁力测量和穆斯堡尔光谱对所有产品进行磁性表征，并通过感应加热测量确定比损耗功率 (SLP)。在棉花存在下通过水热合成获得的所有铁氧体纳米颗粒均表现出良好的热性能。 MnFe2O4 纳米粒子表现出最高的 SLP 值，90 W g−1，其次是 Fe3−xO4 和 CoFe2O4。对于CoFe2O4，消除棉花后获得的NP的比损耗功率提高了50%，这是由合成过程中采用棉花模板的NP形态来解释的。
MFe2O4 (M = Co, Fe, Mn) compounds were synthesized using hydrothermal treatment in the presence of medicinal cotton. Two sets of nanoparticles were produced for each composition and subsequently characterized by XRD, TEM and SEM. The nanoparticles obtained from the solution display the expected spinel structure and different mean sizes (below 16 nm); the nanoparticles embedded in cotton were subjected to a calcination process for cotton elimination. Regarding these calcinated samples, the spinel structure was maintained for CoFe2O4, a mixture of phases was identified for the M = Mn sample and, in the case of iron, the magnetite phase was converted to hematite (α-Fe2O3). After cotton elimination the samples exhibit a morphology which evidences the role of cotton as a template. To evaluate the quality of the nanoparticles for hyperthermia, SQUID magnetometry and Mossbauer spectroscopy were used to perform the magnetic characterization of all products, and the specific loss power (SLP) was determined by induction heating measurements. All the ferrite NP obtained by hydrothermal synthesis in the presence of cotton display good hyperthermia performance. MnFe2O4 nanoparticles exhibit the highest SLP value, 90 W g−1, followed by Fe3−xO4, and CoFe2O4. In the case of CoFe2O4, the specific loss power of the NP obtained after cotton elimination is enhanced by 50% which is explained by the NP morphology adopted from the cotton template during the synthesis.