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A simple synthesis of size-reduce magnetite nano-crystals via aqueous to toluene phase-transfer method

Bakar, M. Abu and Tan, W. L. and Bakar, N. H. H. Abu (2007) A simple synthesis of size-reduce magnetite nano-crystals via aqueous to toluene phase-transfer method. Journal of Magnetism and Magnetic Materials, 314 . pp. 1-6.

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Abstract

A simple one-step liquid–liquid phase-transfer synthesis of magnetite nanocrystals affording enhanced size reduction is described. Oneand two-step particle transfer methods are compared. In the one-step method, particles are synthesized in a biphasic medium where the particles are formed in the microdroplets and migrate to the organic phase simultaneously, whereas in the two-step method, particles are first prepared in an aqueous phase and subsequently transferred to the organic phase. In both methods, CTAB was used as both a stabilizer and a transferring agent. Data from FTIR and XRD suggest invariably that the particles obtained are of magnetite, Fe3O4. The aqueous to organic phase-transfer efficiency is 499:5% for both methods. In the one-step method the average particle size and standard deviation ðsÞ is half of that afforded in the two-step method (ca. 18:3 þ 7:7 nm cf. 42:2 þ 17:6 nm). This reduction in particle size is attributed to the formation of water in oil droplets that act as nanoreactors for the synthesis of magnetite particles.

Item Type:Article
Subjects:Physical Science > Nanomagnetics
ID Code:4600
Deposited By:CSMNT
Deposited On:08 Apr 2009 08:03
Last Modified:08 Apr 2009 08:03

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