Clustering of magnetic nanoparticles using a double hydrophilic block copolymer, poly(ethylene oxide)-b-poly(acrylic acid) |
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Authors: | Ronny Sondjaja Michael KC Tam |
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Institution: | a Singapore-MIT Alliance, 4 Engineering Drive 3, National University of Singapore 117576, Singapore b Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA c Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario, Canada N2L3G1 |
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Abstract: | The use of a double hydrophilic block copolymer (DHBC), poly(ethylene oxide)-block-poly(acrylic acid) (PEO-b-PAA) to prepare magnetic nanoparticle (MNP) clusters was investigated. In this one-pot synthesis method, the DHBC controlled the particle growth and served as both stabilizer and clustering agent. Depending on the iron-to-polymer ratio, the synthesized particles can be in the form of colonies of small iron oxide particles or clusters of these particles with size larger than 100 nm. Compared to the previous reported result using random copolymers, the clusters prepared with DHBC were more compact and homogeneous. The yield of clusters increased when the amount of polymer added was limiting. Insufficient amounts of polymer resulted in the formation of bare patches on the magnetite surface, and the strong van der Waals attraction induced cluster formation. |
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Keywords: | Magnetic nanoparticle Block copolymer Poly(ethylene oxide) Poly(acrylic acid) |
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