Magnetic Nanoparticles as Controlling Agents of Chain Structures in a Rotating Magnetic Field

Authors Nishant Nair1,2, Snehal Jani3, Ranjeet Brajpuriya4

1Department of Physics, Maharaja Krishnakumarsinhji Bhavnagar University, Bhavnagar, 364002 Gujarat, India

2Department of Physics, Indian Institute of Technology Madras, Chennai, 600036 Tamil Nadu, India

3Department of Physics, Amity School of Pure & Applied Sciences, Amity University Madhya Pradesh, Maharajpura Dang, 474005 Gwalior (MP), India

4Department of Physics, University of Petroleum and Energy Studies, 248007 Uttarakhand, India

Issue Volume 15, Year 2023, Number 1
Dates Received 05 January 2023; revised manuscript received 15 February 2023; published online 24 February 2023
Citation Nishant Nair, Snehal Jani, Ranjeet Brajpuriya, J. Nano- Electron. Phys. 15 No 1, 01016 (2023)
PACS Number(s) 47.65.Cb, 78.67.Bf, 07.55.Db
Keywords Magnetic fluid (21) , Nanoparticles (70) , Magnetic field (7) .

Chain formation in magnetic fluid has been observed under the influence of a rotating magnetic field. The influence on the chain flexibility and its rupture was studied by varying the frequency of rotation (1-5 Hz) of the magnetic field of a fixed magnitude (50 Gauss). Micrometer sized Fe3O4 particles and non-magnetic expancel spheres of fixed concentration were later suspended in the magnetic fluid separately and their effect on the chain rotation dynamics was studied. It was observed that the critical frequency for the chain breakage was higher in the presence of larger magnetic particles compared to magnetic fluid alone. Non-magnetic particles formed chain structures in the presence of a static field but did not show any response to the rotation of the magnetic field. The established theory of magnetic chain formation was used to study and discuss the results by comparing the magnetic forces and viscous forces. The study may be useful for controlling chain length and flexibility in microfluidics.

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