Alkyl Phosphonate/Phosphate Coating on Magnetite Nanoparticles: A Comparison with Fatty Acids

• DOI: 10.1021/la010703+
• Publication Date: 2002-07-26T04:37:30Z
• Authors: Yudhisthira Sahoo; Hillel Pizem; Tcipi Fried; Dina Golodnitsky; Larisa Burstein; Chaim N. Sukenik; Gil Markovich
• Keywords: Phosphonate; Thermogravimetric analysis; Carboxylate

Coated magnetite nanoparticles with a 6−8 nm average diameter were prepared. The surfactants used to stabilize the and disperse them in organic solvents oleic acid (OA), lauric , dodecyl phosphonate, hexadecyl dihexadecyl phosphate. Transmission electron microscopy analyses of aggregation coated particles suggest that carboxylate provide better isolation dispersibility as compared phosphonate surfactants. However, Fourier transform infrared spectra phosphate these cover surface islands high packing density. thermogravimetric differential scanning calorimetry measurements there is quasi-bilayer covering nanoparticles, varying amounts surfactant outer layer second weakly bound primary through hydrophobic interactio...