A universal magnetic ferrofluid: Nanomagnetite stable hydrosol with no added dispersants and at neutral pH

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• 作者：Andrey S. Drozdov^a ; ^{drozdov@scamt.ru" class="auth_mail" title="E-mail the corresponding author} ; Vladimir Ivanovski^b ; ^{vladimir.ivanovski@yahoo.com" class="auth_mail" title="E-mail the corresponding author} ; David Avnir^c ; ^{david.avnir@mail.huji.ac.il" class="auth_mail" title="E-mail the corresponding author} ; Vladimir V. Vinogradov^a ; ^{vinogradoffs@mail.ru" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Magnetite ; Hydrosol ; Magnetic fluid ; Biocompatible
• 刊名：Journal of Colloid and Interface Science
• 出版年：2016
• 出版时间：15 April 2016
• 年：2016
• 卷：468
• 期：Complete
• 页码：307-312
• 全文大小：1139 K

文摘

A facile method to produce highly stable magnetite magnetic fluid at neutral pH without any stabilizing agents, resulting in pure Fe₃O₄ nanoparticles dispersed in water is described. The hydrosol which consists of only two components – magnetite and water – behaves as a typical ferrofluid, that is, although it responds to a magnetic field, the magnetic particles cannot be phase-separated from the water by that field. No such pure magnetic fluid have been described before, making it a universal carrier which can be easliy modified for any application in materials science and chemistry, and in particular for a range of applications where non-corrosivity, low viscosity, and mild conditions are needed, such as in most bioapplications and in nano electro-mechanical systems. Under optimal conditions the hydrosol is stable for at least three months.