title: A universal magnetic ferrofluid: Nanomagnetite stable hydrosol with no added dispersants and at neutral pH.
abstract: 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 easily 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.
authors: Laboratory of Solution Chemistry of Advanced Materials and Technologies, ITMO University, St. Petersburg, 197101, Russian Federation. Electronic address: drozdov@scamt.ru.
authors: Andrey S
authors: AS
authors: Drozdov
authors: Institute of Chemistry, Faculty of Natural Sciences and Mathematics, Ss. Cyril and Methodius University in Skopje, Skopje, 1000, Republic of Macedonia. Electronic address: vladimir.ivanovski@yahoo.com.
authors: Vladimir
authors: V
authors: Ivanovski
authors: Institute of Chemistry and the Centre for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel. Electronic address: david.avnir@mail.huji.ac.il.
authors: David
authors: D
authors: Avnir
authors: Laboratory of Solution Chemistry of Advanced Materials and Technologies, ITMO University, St. Petersburg, 197101, Russian Federation. Electronic address: vinogradoffs@mail.ru.
authors: Vladimir V
authors: VV
authors: Vinogradov
mesh_terms: D003102:Colloids / Q000737:chemistry; D005290:Ferric Compounds / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D013499:Surface Properties
chemical_list: D003102:Colloids; D005290:Ferric Compounds; D058185:Magnetite Nanoparticles
keywords: Biocompatible; Hydrosol; Magnetic fluid; Magnetite