Influence of Cyclodextrin in the Synthesis of Magnetite
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Mater. Res. Soc. Symp. Proc. Vol. 1243 © 2010 Materials Research Society
Influence of Cyclodextrin in the Synthesis of Magnetite L. A. Cobos Cruz1, C. A. Martínez Perez1, A Martínez Villafañe2, J. A. Matutes Aquino2, J. R. Farias Macilla2 and P. E. García Casillas1 1 Instituto de Ing. y Tecnología, Universidad Autónoma de Cd. Juárez, Cd. Juárez Chih., México 2 Centro de Investigaciones en Materiales Avanzados, Chihuahua, Chih., México ABSTRACT Cyclodextrin (CD) has been studied intensively due to its ability to form inclusion complexes with a variety of guest molecules in the solid state. A few studies have paid attention to the use of CD to facilitate the synthesis of inorganic nanoparticles. In this work the synthesis of magnetite (M) is made in the presence of CD. The particle size of the inorganic material is controlled by the presence of CD, in which spherical particles of few nanometers are grown. The synthesis of Fe3O4 (M) in the presence of α-cyclodextrin (α-CD) and β-cyclodextrin (βCD) is described. The formation of an M-CD complex is studied in both cases by Fourier transform infrared spectroscopy (FT-IR) in order to elucidate the chemical bonding of the complex. The morphology and size of the particles are determined by Field Emission Scanning Electron Microscopy (FESEM) and software. X-ray diffraction (XRD) is used to confirm the formation of magnetite. INTRODUCTION In the last few years many researchers have synthesized several complexes using cyclodextrin (CD). However, most of their works have been focused to the synthesis of CD-organic complexes. A strategy explained by Rauf [1], having a great potential application in materials science, is the modification of CD in order to protect some hydroxyl groups and direct the incoming reagent exclusively to other open hydroxyl groups, this methodology permits the formation of a complex with a variety of guests. Cyclodextrins are water-soluble oligosaccharides composed of at least six (1-4) linked α-Dglucosyl residues which have the shape of a hollow, truncated cone, capable of forming inclusion complexes with a variety of guest molecules in the solid state, as well as in solution. The size of these molecules should be compatible with the dimensions of the cavity [2]. The inner diameter of the cavity varies from 0.57 to 0.95 nm as the number of glucose units increases from 6 (α−CD) to 8(γ−CD) [3]. Iron oxides have been extensively studied for applications in biomedical areas. Due to its interesting properties and great stability, magnetite is the most popular magnetic material in applications like hyperthermia, drug delivery, cell separation, and others [4-8]. For these applications it is very important to use particles of the iron oxides of a few nanometers in size and narrow particle size distribution in order to improve their magnetic properties. In the past few years, magnetite nanoparticle has been synthesized by several methodologies, such as sol-gel processing, microemulsion, sputtering, thermal decomposition, and others [9-14].
However the co-prec
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