Temperature dependence of the magneto-controllable first-order phase transition in dilute magnetic fluids

• Published in: Journal of magnetism and magnetic materials Vol. 441; pp. 620 - 627
• Main Author: Ivanov, A.S.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.11.2017; Elsevier BV
• Subjects: Dilution; Distribution functions; Drop-like aggregates; Ferrofluids; Fluids; Granulometric analysis; Liquidus; Magnetic fields; Magnetic fluid; Magnetic fluids; Particle size; Particle size distribution; Phase transition; Phase transitions; Polydispersity; Spinodal decomposition; Studies; Temperature dependence; Temperature effects; Vaporus; Vaporus; Magnetic fluid; Drop-like aggregates; Granulometric analysis; Liquidus; Phase transition
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2017.06.059

Experimental study was carried out to investigate the influence of particle size distribution function on the temperature dependent magneto-controllable first-order phase transition of the “gas–liquid” type in magnetic fluids. The study resolves one crisis situation in ferrohydrodynamic experiment made by several research groups in the 1980–1990s. It is shown that due to polydispersity magnetic fluids exhibit phase diagrams which are divided into three regions by vaporus and liquidus curves. Granulometric data states the primary role of the width of the particle size distribution function in the process of spinodal decomposition. New modified Langevin parameter is introduced for unification of liquidus curves of different ferrofluids despite the significant difference between the curves (one order of magnitude) in (H,T) coordinates.