AI Article Synopsis
- The study explores how the dynamic viscosity of highly concentrated transformer oil-based magnetic nanofluids changes with particle volume fraction and temperature, specifically without an external magnetic field.
- The Krieger-Dougherty formula was used to model the relationship between relative viscosity and solid particle volume fraction, allowing for the determination of colloidal particle characteristics like mean ellipticity and surfactant layer thickness.
- Analysis of particle size and shape through various methods indicated that magnetite nanoparticles form small clusters due to van der Waals forces, with an effective oleic acid surfactant layer thickness of approximately 1.4 nm, corroborating earlier research findings.
Article Abstract
In this paper the particle volume fraction and temperature dependence of the dynamic viscosity of highly concentrated transformer oil based magnetic nanofluids was investigated in the absence of an external magnetic field. The solid particle volume fraction dependence of the relative viscosity was found to be very well fitted by the Krieger-Dougherty formula, whence the mean ellipticity of the colloidal particles and the effective surfactant layer thickness were obtained. Using the information on the particles' size and shape statistics obtained from TEM, DLS and magnetogranulometry investigations, it was concluded that the magnetite nanoparticles agglomerate in small clusters of about 1.3 particles/cluster, due to the van der Waals interactions. The effective thickness of the oleic acid surfactant layer was estimated as about 1.4 nm, in very good agreement with the value resulted from previous SANS investigations.
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| http://dx.doi.org/10.1016/j.jcis.2011.10.060 | DOI Listing |
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