سال انتشار: ۱۳۹۰

محل انتشار: کنفرانس بین المللی فرآورش پلیمرها

تعداد صفحات: ۳

نویسنده(ها):

A Golbang – Polymer Engineering Department, Faculty of Chemical Engineering, Tarbiat Modares University, P.O. Box: 14115-114
M Kokabi –

چکیده:

Magnetic field-responsive materials are specific subsets of smart materials that can adaptively change their physical properties due to an applied external magnetic field [1]. In this work, micron sized magnetic particles (NdFeB) were dispersed in a polyvinyl alcohol (PVA) hydrogel. This magnetic ferrogel combines the elastic properties of PVA gel and the magnetic properties of NdFeB particles [2]. The response of the ferrogel (with NdFeB concentration in the range of 5–۴۰ wt%) to the application of a static magnetic field (maximum of 1.8 T) was investigated. The results showed that the extent of elongation depended strongly on the NdFeB content and the magnetic field strength. Shape distortion occurs instantaneously and disappears abruptly when an external magnetic field is applied or removed, respectively [3]. The phenomenology of shape changes in the manufactured magnetic field sensitive polymer gels when exposed to the nonuniform external magnetic field is the main objective in this study