Cited 0 time in webofscience Cited 0 time in scopus

Effects of surface treatment on magnetic carbonyl iron/polyaniline microspheres and their magnetorheological study

Title
Effects of surface treatment on magnetic carbonyl iron/polyaniline microspheres and their magnetorheological study
Authors
Min, Tae HongChoi, Hyuoung JinKim, Nam-HuiPark, KwonjinYou, Chun-Yeol
DGIST Authors
Park, Kwonjin; You, Chun-Yeol
Issue Date
2017
Citation
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 531, 48-55
Type
Article
Article Type
Article
ISSN
0927-7757
Abstract
To achieve better chemical affinity between conducting polyaniline (PANI) and soft magnetic carbonyl iron (CI) microspheres, we initially attached hydroxyl groups to the surface of CI using p-toluenesulfonic acid monohydrate. The PANI-coated CI composite particles were then fabricated via a chemical oxidation polymerization method. Both the aniline monomer and anilinium cation tended to surround the activated surface of the CI microspheres due to hydrogen bonding and electrostatic interactions, providing a better core-shell shape of the CI/PANI particles. Crystallinity of the product particles and bonding between CI and PANI were measured by X-ray diffraction and FT-IR spectroscopy, respectively, while the shell morphology and thermal stability were measured by scanning electron microscope and thermogravimetric analysis, respectively, confirming the successful coating performance. Viscoelastic behaviors of the MR fluid prepared by suspending the magnetic particles in medium oil were measured via a rotation rheometer under an induced magnetic field. It also exhibited a typical MR flow behavior, which was analyzed using various rheological models. Its sedimentation was detected using a Turbiscan, showing a 60% and 11% improved dispersion stability at 200 min and 900 min, respectively, compared to the pure CI particles by decreasing the density mismatch between composite particle and silicone oil. © 2017 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/4459
DOI
10.1016/j.colsurfa.2017.07.070
Publisher
Elsevier B.V.
Files:
There are no files associated with this item.
Collection:
Emerging Materials ScienceSpin Phenomena for Information Nano-devices(SPIN) Lab1. Journal Articles


qrcode mendeley

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE