Particle size distribution in ferrofluid macro-clusters

详细信息    查看全文

• 作者：Wah-Keat Lee ; ^{wklee@bnl.gov} ; Jan Ilavsky
• 关键词：Ferrofluids ; X-ray imaging ; Small angle scattering
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2013
• 出版时间：March, 2013
• 年：2013
• 卷：330
• 期：Complete
• 页码：31-36
• 全文大小：391 K

文摘

Under an applied magnetic field, many commercial and concentrated ferrofluids agglomerate and form large micron-sized structures. Although large diameter particles have been implicated in the formation of these macro-clusters, the question of whether the particle size distribution of the macro-clusters are the same as the original fluid remains open. Some studies suggest that these macro-clusters consist of larger particles, while others have shown that there is no difference in the particle size distribution between the macro-clusters and the original fluid. In this study, we use X-ray imaging to aid in a sample (diluted EFH-1 from Ferrotec) separation process and conclusively show that the average particle size in the macro-clusters is significantly larger than those in the original sample. The average particle size in the macro-clusters is 19.6 nm while the average particle size of the original fluid is 11.6 nm.