About Chapter 7: Ferromagnetic Ferrofluids: Ferromagnetic Ordering of Colloidal Magnetic Nanoplatelets In a magnetic colloid composed of a nematic liquid crystal as a carrier and anisotropic magnetic nanoplatelets as a dispersed phase, ferromagnetic ordering emerges at room temperature due to the orientational order of the nematic liquid crystal. Remarkably, also when dispersed in an isotropic liquid, these platelets spontaneously exhibit ferromagnetic ordering at high concentrations. This entirely new kind of colloidal nanosystem, i.e., ferromagnetic ferrofluids, shows ferromagnetic ordering with spontaneous magnetization in the absence of an external magnetic field. In this chapter, materials and synthesis procedures are described, followed by phase behaviour and distinctive properties of ferromagnetic ferrofluids, such as domain structures and the time-scale of their formation, with special regard to their high sensitivity to weak magnetic fields and associated shape changing effect.
Title of the book: Magnetoresponsive Soft Nanosystems: Fundamentals and Applications
Edited by Sophie Laurent and Ladislau Vékás
Volume 75
Hardback ISBN: 978-1-83767-242-4
EPUB ISBN: 978-1-83767-703-0
PDF ISBN: 978-1-83767-702-3
Series: Nanoscience & Nanotechnology Series
Special Collection: 2026 eBook collection
No. of Pages: 692