Rosensweig Instability Study of Iron Oxide Nano Fluid Under Uniform Magnetic Field

被引:0
作者
Nimisha, O. K. [1 ]
Pal, Shubhadeep [2 ]
Divya, D. [1 ]
Al-Omari, Imaddin A. [3 ]
Pradeesh, Kannan [1 ]
Mary, A. P. Reena [1 ]
机构
[1] Univ Calicut, Goverment Victoria Coll, Dept Phys, Palakkad 678001, Kerala, India
[2] Tata Inst Fundamental Res, Ctr Interdisciplinary Sci, Hyderabad 500046, Telangana, India
[3] Sultan Qaboos Univ, Dept Phys, POB 36, Muscat 123, Oman
关键词
Ferrofluid; Surface Tension; Pendant Drop Method; Rosensweig Instability; Hydrodynamic Radius; Magnetization Measurement; FERROFLUIDS; SURFACE; STABILITY;
D O I
10.1166/jon.2023.1944
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
We report the synthesis of magnetic nanofluids and the investigations on the formation of surface instabilities of ferrofluid when exposed to a normal uniform magnetic field. Ferrofluid of iron oxide particles with an average size of 9 nm, dispersed in a kerosene base is synthesized by a well-known chemical method. The structural analysis of the nanoparticles is carried out by employing X-ray diffraction technique. Fourier Transform Infrared Spectroscopy studies revealed the chemical binding with the surfactant. The Dynamic Light Scattering studies are performed to determine the hydrodynamic size of the suspended particles. The constancy in hydrodynamic size obtained for different particle concentrations is indicative of agglomeration-free suspension. The magnetic properties have been analyzed by the Superconducting Quantum Interference Device. The magnetization measurement signifies the superparamagnetic nature of particles. The temperature-dependent relaxation studies were carried out by field cooled (FC) and zero field cooled (ZFC) moment measurements at a constant applied field. We have demonstrated the Rosensweig instability experimentally and observed the pattern transition. The surface takes on a hexagonal pattern when the applied field surpasses the critical field, which shifts to a square pattern when the applied field reaches a second threshold. The surface tension of the fluid is measured by the pendant drop method and is correlated with the results obtained through instability measurement. The magnetic concentration of the sample is determined from the Thermo gravimetric analysis.
引用
收藏
页码:183 / 191
页数:9
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