Magneto-viscosity of hydrothermal synthesized Cu-Zn ferrite ferrofluids

Gautam, Nisha; Thirupathi, G.; Singh, Ramesh

doi:10.1063/1.4977759

Cited by 4 publications

(1 citation statement)

References 14 publications

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“…This rotation results in a colloidal uniaxial anisotropy with two preferred directions, parallel and antiparallel to the axis of the initial magnetic field. As the field is further increased above 165 mT, magnetostatic interactions dominate, and the chains begin to compress into columns [63,64]. Since the aggregated chains cannot easily change direction in a rotating magnetic field, there exists a single preferred direction parallel to the direction of the initial magnetic field-an apparent colloidal unidirectional anisotropy.…”

Section: (B)) a Narrow Linearmentioning

confidence: 99%

Correlation between physical structure and magnetic anisotropy of a magnetic nanoparticle colloid

et al. 2018

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We show the effects of a time-invariant magnetic field on the physical structure and magnetic properties of a colloid comprising 44 nm diameter magnetite magnetic nanoparticles, with a 24 nm dextran shell, in water. Structural ordering in this colloid parallel to the magnetic field occurs simultaneously with the onset of a colloidal uniaxial anisotropy. Further increases in the applied magnetic field cause the nanoparticles to order perpendicular to the field, producing unexpected colloidal unidirectional and trigonal anisotropies. This magnetic behavior is distinct from the cubic magnetocrystalline anisotropy of the magnetite and has its origins in the magnetic interactions among the mobile nanoparticles within the colloid. Specifically, these field-induced anisotropies and colloidal rearrangements result from the delicate balance between the magnetostatic and steric forces between magnetic nanoparticles. These magnetic and structural rearrangements are anticipated to influence applications that rely upon time-dependent relaxation of the magnetic colloids and fluid viscosity, such as magnetic hyperthermia and shock absorption.

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Section: (B)) a Narrow Linearmentioning

confidence: 99%