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Preparation and properties of poly(ethylene glycol)-block-poly(acrylic acid)-coated cobalt nanocrystals

✍ Scribed by Nemesio Martinez-Castro; Zhihan Zhou; Guojun Liu

Book ID
104088289
Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
637 KB
Volume
51
Category
Article
ISSN
0032-3861

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✦ Synopsis

Reported in this paper are the preparation and properties of 3-Co nanocrystals coated by poly(ethylene glycol)-block-poly(acrylic acid) (PEG-b-PAA). These particles were prepared via the thermal decomposition of Co 2 (CO) 8 at 185 C in 1,2-dichlorobenzene, in the presence of the surfactant PEG-b-PAA and the co-surfactant trioctylphosphine oxide. At a given initial Co 2 (CO) 8 concentration, the size of the particles increased with increasing Co 2 (CO) 8 -to-PEG-b-PAA molar ratio, and could be tuned between w5 and w20 nm. The size distribution of the particles narrowed as the Co 2 (CO) 8 concentrations increased. The resultant particles were dispersible in a wide range of solvents, including chloroform, N,N-dimethylforamide, and water, which solubilized PEG. Magnetic measurements revealed that the particles possessed saturation magnetization close to that of bulk Co, suggesting high purity of the particles.

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