An Experimental Study on the Motion Through a Microchannel of a Ferrofluid Based on Ultrapure Magnetite Nanoparticles

This paper presents experimental research on the relationship between the magnetic properties and the viscosity of ferrofluid based on ultra-pure magnetite nanoparticles, with the aim of studying behaviour through a microchannel. The magnetite nanoparticles have been obtained by chemical coprecipitation. Some examination methods, such as X-ray diffraction, transmission electron microscopy, and vibrating sample magnetometer, have been used to characterize the magnetite nanoparticles. The variation on the viscosity in the magnetic field of ferrofluids based on superparamagnetic magnetite has parabolic allure and in the absence of the magnetic field has a linear allure. The colloidal stability of the ferrofluids was evaluated using zeta potential measurements. Also, the behaviour of ferrofluids in a microchannel made inside the transparent polydimethylsiloxane (PDMS) matrix was observed under a digital microscope.