磁性介孔颗粒的合成与表征。

Synthesis and characterization of magnetic mesoporous particles.

机构信息

Instituto de Física, Universidade Federal da Bahia (UFBA), Campus Universitário da Federação/Ondina, 40210-340 Salvador, BA, Brazil.

出版信息

J Colloid Interface Sci. 2010 Feb 15;342(2):269-77. doi: 10.1016/j.jcis.2009.10.052. Epub 2009 Oct 25.

DOI:10.1016/j.jcis.2009.10.052

PMID:19917508

Abstract

Magnetic mesoporous particles were synthesized and their magnetic and structural properties are reported. The synthesis procedure consists of four steps: (i) preparation of magnetite colloidal nanoparticles; (ii) growth of a silica layer; (iii) development of the mesoporous structure and (iv) template removal. Two different methods for the template removal were studied and their effectiveness was discussed. Magnetization and Mössbauer spectroscopy measurements showed superparamagnetic behavior for the particles at room temperature. X-ray diffraction and nitrogen adsorption measurements showed a mesoporous MCM-41 structure with 2.48nm pore diameter and 1023m(2)/g total area.

摘要

合成了磁性介孔粒子，并对其磁性和结构性质进行了报道。该合成过程包括四个步骤：（i）制备胶体磁性纳米粒子；（ii）生长二氧化硅层；（iii）开发介孔结构；（iv）模板去除。研究了两种不同的模板去除方法，并讨论了它们的有效性。室温下，磁化和穆斯堡尔光谱测量表明粒子具有超顺磁性。X 射线衍射和氮气吸附测量表明，具有 2.48nm 孔径和 1023m(2)/g 总表面积的介孔 MCM-41 结构。