Dynamics of CoFe₂O₄ Single-Core Nanoparticles in Viscoelastic Media

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• 作者：Hilke Remmer^a ; ^{h.remmer@tu-bs.de" class="auth_mail" title="E-mail the corresponding author} ; Jan Dieckhoff^a ; Andreas Tschö ; pe^b ; Eric Roeben^c ; Annette M. Schmidt^c ; Frank Ludwig^a
• 关键词：Magnetic nanoparticles ; dynamics ; viscoelastic media ; ac susceptibility ; magnetorelaxometry
• 刊名：Physics Procedia
• 出版年：2015
• 出版时间：2015
• 年：2015
• 卷：75
• 期：Complete
• 页码：1150-1157
• 全文大小：569 K

文摘

The dynamics of single-core CoFe₂O₄ nanoparticles in viscoelastic media was studied utilizing ac susceptibility and fluxgate magnetorelaxometry measurements. As viscoelastic medium aqueous gelatin suspensions with gelatin contents between 2.5 wt% and 10 wt% were used. Specifically, the gelation kinetics after cooling the sample from the sol state (313 K) to 296 K was investigated. It is shown that the measurement results can be analyzed with the Voigt-Kelvin model thus providing information on local dynamic viscosity and shear modulus.