کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1803934 | 1024637 | 2007 | 6 صفحه PDF | دانلود رایگان |

A simple one-step liquid–liquid phase-transfer synthesis of magnetite nanocrystals affording enhanced size reduction is described. One- and 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 >99.5%>99.5% for both methods. In the one-step method the average particle size and standard deviation (σ)(σ) is half of that afforded in the two-step method (ca. 18.3+7.7nm cf. 42.2+17.6nm). 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.
Journal: Journal of Magnetism and Magnetic Materials - Volume 314, Issue 1, July 2007, Pages 1–6