SONG, Pingsan
(2010)
Synthesis of Symmetrical and Anisotropic Core-Shell Magnetic Composite Particlesand Progress in Controllable Migration of Magnetic Core in Composite Particles.
Master's Thesis, University of Pittsburgh.
(Unpublished)
Abstract
In this work, a two-step method is developed to synthesize both symmetrical and anisotropic magnetic composite particles. First of all, magnetic-polymer seed particles are synthesized from iron oxide, styrene and methyl methacrylate by emulsion polymerization. Then magnetic composite particles are produced from synthesized seeds and styrene by seeded dispersion polymerization. The anisotropy of the magnetic composite particles could be achieved by the addition of a small amount of tetrahydrofuran (THF) into the alcohol-based polymerization medium. Moreover, two solvent compositions were found to be effective to swell the synthesized magnetic composite particles and enable the migration of magnetic cores inside the polymer spheres. The structure of magnetic core or the morphology and monodispersity of the composite particles were not destroyed during this swelling process. One mixture solvent contains THF, ethylene glycol (ETG), ethanol and water, with particles protected by a suitable amount of poly vinyl pyrrolidone-40 (PVP-40), and the other is a mixture of ETG and THF.
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Details
| Item Type: |
University of Pittsburgh ETD
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| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
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| Date: |
2 June 2010 |
| Date Type: |
Completion |
| Defense Date: |
12 April 2010 |
| Approval Date: |
2 June 2010 |
| Submission Date: |
5 April 2010 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Dietrich School of Arts and Sciences > Chemistry |
| Degree: |
MS - Master of Science |
| Thesis Type: |
Master's Thesis |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
anisotropic; dispersion polymerization; emulsion polymerization; magnetic; swelling |
| Other ID: |
http://etd.library.pitt.edu/ETD/available/etd-04052010-131459/, etd-04052010-131459 |
| Date Deposited: |
10 Nov 2011 19:34 |
| Last Modified: |
15 Nov 2016 13:38 |
| URI: |
http://d-scholarship-dev.library.pitt.edu/id/eprint/6779 |
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