Light intensity measurements of colloidal stability of Fe₃O₄ particles in aqueous suspensions for biomedical applications

V. Singh¹ - M. Sharma²

¹ Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110016, India
² Center for Applied Research in Electronics, Indian Institute of Technology Delhi, Hauzkhas, New Delhi-110016, India

Abstract
Aggregation behavior of magnetic nanoparticle (MNP) suspensions is a complex process governed by a large number of factors, which include the material parameters as well as a number of short- and long-range interactions. We study the optical transmittance of magnetic nanoparticle suspension to understand the colloidal stability as a function of time in the presence and absence of magnetic field. The role of gravity along with other interacting forces is incorporated to understand the aggregation dynamics. These real-time quick measurements help us to analyze the system behavior within few hours of sample preparation. It is possible to extract fundamental information about MNP suspensions using these measurements. Figs 4, Refs 7.