Surfactant isomerization and dehydrogenation on FePt nanoparticles

Surfactant coated FePt nanoparticles were characterized using Fourier transform infrared spectroscopy (FTIR). The FTIR spectra indicate that there is a conversion of the alkyl chain of the surfactant from the oleyl form ( cis-9-octadecenyl) to the elaidyl form ( trans-9-octadecenyl) during the synth...

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Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2007-07, Vol.301 (1), p.113-116
Main Authors: Shukla, Nisha, Svedberg, Erik. B., Ell, J.
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Exact sciences and technology
FePt nanoparticles
FTIR
General and physical chemistry
Magnetic nanoparticles
Nanoparticles
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Surfactant
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Summary:Surfactant coated FePt nanoparticles were characterized using Fourier transform infrared spectroscopy (FTIR). The FTIR spectra indicate that there is a conversion of the alkyl chain of the surfactant from the oleyl form ( cis-9-octadecenyl) to the elaidyl form ( trans-9-octadecenyl) during the synthesis of the FePt nanoparticles. This is revealed by the presence of several vibrational absorption bands in the region of the olefinic C H stretching modes. The appearance of infrared absorption bands due to olefinic C H stretching is due to the presence of Fe in the nanoparticles. The FTIR spectrum of platinum nanoparticles does not reveal the presence of olefinic C H modes. The concentration of Fe in the FePt nanoparticles influences the intensity of the olefinic C H stretching modes. The high intensity of these olefinic C H modes in nanoparticles with high Fe concentration indicates that Fe acts as a catalyst for cis to trans conversion and may lead to dehydrogentation of the alkyl chains.
ISSN:0927-7757
1873-4359
DOI:10.1016/j.colsurfa.2006.12.031