Magnetic susceptibility characterisation of superparamagnetic microspheres

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:452

Article

Grob, David Tim¹  Wise, Naomi¹  Oduwole, Olayinka¹  Sheard, Steve¹ 

[1] Univ Oxford, Dept Engn Sci, Parks Rd, Oxford OX1 3PJ, England

关键词: Magnetic separation;    Magnetic beads;    Magnetic microspheres;    Magnetophoresis;    Magnetophoretic mobility;    Susceptibility;    SQUID;   

DOI  :  10.1016/j.jmmm.2017.12.007

来源: Elsevier

【 摘 要 】

The separation of magnetic materials in microsystems using magnetophoresis has increased in popularity. The wide variety and availability of magnetic beads has fuelled this drive. It is important to know the magnetic characteristics of the microspheres in order to accurately use them in separation processes integrated on a lab-on-a-chip device. To investigate the magnetic susceptibility of magnetic microspheres, the magnetic responsiveness of three types of Dynabeads microspheres were tested using two different approaches. The magnetophoretic mobility of individual microspheres is studied using a particle tracking system and the magnetization of each type of Dynabeads microsphere is measured using SQUID relaxometry. The magnetic beads' susceptibility is obtained at four different applied magnetic fields in the range of 38-70 mT for both the mobility and SQUID measurements. The susceptibility values in both approaches show a consistent magnetic field dependence. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

Free