Study of the interactions between the surface chemisorbed layer and the surrounding media in magnetite-coated nanoparticles using Raman spectroscopy

• Published in: Journal of magnetism and magnetic materials Vol. 226; pp. 1890 - 1892
• Main Authors: da Silva, S.W, Soler, M.A.G, Gansau, C, Buske, N, Morais, P.C
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-05-2001
• Subjects: Magnetic fluids; Raman scattering; Spectroscopy; Surface structure; Spectroscopy; Raman scattering; Magnetic fluids; Surface structure
• ISSN: 0304-8853
• DOI: 10.1016/S0304-8853(00)01385-8

Raman spectroscopy is used to investigate surface-coated magnetite nanoparticles (9
nm diameter) dispersed in aqueous medium. In a first sample, the magnetite nanoparticle is coated with dextran. In a second sample the magnetite nanoparticle is double-coated with a dodecanoic layer following an ethoxylated polyalcohol layer. The Raman measurements were focused on the typical intra-molecular OH-stretching mode chemiosorbed at the nanoparticle surface. The data are discussed in terms of the suppression of the symmetric and asymmetric hydrogen bonded mode in both samples.