Surfactant isomerization and dehydrogenation on FePt nanoparticles

被引：15

作者：

Shukla, Nisha ^{[1
]}

Svedberg, Erik. B. ^{[1
]}

Ell, J. ^{[1
]}

机构：

[1] Seagate REs, Pittsburgh, PA 15222 USA

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2007年 / 301卷 / 1-3期

关键词：

nanoparticles; FTIR; surfactant; FePt nanoparticles; magnetic nanoparticles;

D O I：

10.1016/j.colsurfa.2006.12.031

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：113 / 116

页数：4

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