Preparation and Properties of an Aqueous Ferrofluid

Autor:	Katie J. Beckman, Nicholas B. Adelman, George C. Lisensky, Arthur B. Ellis, Dean J. Campbell, Patricia Berger
Rok vydání:	1999
Předmět:	Tetramethylammonium hydroxide Ferrofluid Aqueous solution Nanotechnology General Chemistry Education Magnetic field Colloid chemistry.chemical_compound chemistry Chemical engineering Magnet Magnetic nanoparticles Magnetite
Zdroj:	Journal of Chemical Education. 76:943
ISSN:	1938-1328 0021-9584
DOI:	10.1021/ed076p943
Popis:	Ferrofluids are colloidal suspensions of surfactant-coated magnetic particles in a liquid medium. This paper describes a simple synthesis of an aqueous-based ferrofluid that may be used in an introductory science or engineering laboratory. Magnetite (Fe3O4) particles are precipitated by combining FeCl3 and FeCl2 in a 2:1 stoichiometric ratio in aqueous ammonia solution. The resulting particles, ~10-20 nm in diameter based on powder X-ray diffraction, are then treated with aqueous tetramethylammonium hydroxide, which acts as a surfactant. When the resulting ferrofluid is placed near a magnet, it forms conical spikes. This paper also describes a method for repelling both oil- and water-based ferrofluid from solid surfaces that would otherwise be stained by the fluid. Finally, a demonstration of the interaction between ferrofluid and magnetic fields, in which ferrofluid is induced to leap upward by a stack of magnets, is described.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::177b2c1feb7e8cdad9aa1a78f7c536c5 https://doi.org/10.1021/ed076p943 Zobrazit plný text záznamu