Variations in the Saturation Magnetization of Nanosized NiFe2O4 Particles on Adsorption of Carboxylic Acids
Variations in the Saturation Magnetization of Nanosized NiFe2O4 Particles on Adsorption of Carboxylic Acids
复制标题
纳米 NiFe2O4 颗粒吸附羧酸的饱和磁化强度变化
DOI：
10.1016/j.jascer.2014.01.001
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
and X. Liu
中科院分区：
文献类型：
--
作者：
R. Kurosawa;T. Suzuki;T. Nakayama;H. Suematsu;K. Niihara;S. Satokawa;Y. Yasukawa;and X. Liu
本文研究了NiFe2O4纳米粒子吸附一系列羧酸引起的磁化强度变化。甲酸的应用导致NiFe2O4纳米颗粒在18，000 Oe的磁化强度显著降低8.6%。随着饱和羧酸中碳键数目的增加，NiFe2O4纳米颗粒的磁化强度降低约4%。所有的不饱和羧酸产生近似相等的减少磁化，无论其双键含量。基于这些结果，所观察到的NiFe2O4磁化强度的变化似乎取决于极性或分子大小的羧酸，并被认为是由倾斜或钉扎的自旋在附近的颗粒表面吸附的酸。
This work investigated magnetization changes in NiFe2O4nanoparticles induced by the adsorption of a series of carboxylic acids. The application of formic acid resulted in a significant 8.6% decrease in the magnetization of NiFe2O4nanoparticles at 18,000 Oe. With increasing carbon bond number in the saturated carboxylic acids, reductions in the magnetization of NiFe2O4nanoparticles became around 4%. All unsaturated carboxylic acids produced approximately equivalent reductions in the magnetization, regardless of their double bond content. Based on these results, the observed NiFe2O4magnetization changes appear to depend on either the polarity or the molecular size of the carboxylic acids and are believed to be caused by canting or pinning of spins in the vicinity of particle surfaces following adsorption of the acids.