Work

Ferromagnetic ferrofluids in aqueous and low-polar media

Year: 2025

Type: article

Abstract: Currently known ferromagnetic ferrofluids (FFs), or liquid magnets, are typically composed of permanently magnetic barium hexaferrite nanoplatelets (BHF NPLs) dispersed in 1-butanol, where colloidal stability is achieved through electrostatic repulsion. Here, we report the development of an environmentally friendly, water-based ferromagnetic ferrofluid, in which magnetic dipolar attractions are effectively suppressed by a synergistic combination of electrostatic, steric, and hydration repulsion. We further demonstrate that stable ferromagnetic ferrofluids can also be realized in low-polarity organic solvents such as dichloromethane (DCM) and 1-hexanol, relying solely on sufficient steric-solvation repulsion-without the need for long-range electrostatic repulsion. These different types of ferromagnetic FFs offer a promising platform for tubeless microfluidic pumping in diverse chemical systems.

Source: Journal of Colloid and Interface Science

DOI: 10.1016/j.jcis.2025.138806

Authors: Jošt Tručl, Patricija Hribar Boštjančič, Žiga Gregorin, Peter Medle Rupnik, Alenka Mertelj, Darja Lisjak

Institutions: Jožef Stefan Institute, Jožef Stefan International Postgraduate School

Language: English

Topic: Characterization and Applications of Magnetic Nanoparticles

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $4,470