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Experimental stability analysis of different water-based nanofluids.

Laura Fedele¹, Laura Colla, Sergio Bobbo

¹Consiglio Nazionale delle Ricerche, Istituto per le Tecnologie della Costruzione, Corso Stati Uniti, I-35127 Padova, Italy. sergio.bobbo@itc.cnr.it.

Nanoscale Research Letters

|June 30, 2011

Summary

This study investigated stable nanofluids using single wall carbon nanohorns, titanium dioxide, and copper oxide nanoparticles. High-pressure homogenization proved most effective for creating stable dispersions with enhanced thermal properties.

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Area of Science:

Materials Science
Nanotechnology
Fluid Dynamics

Background:

Nanofluids exhibit unique properties, but their practical application hinges on stable nanoparticle suspensions.
Achieving stable nanofluids is crucial for developing advanced fluids with enhanced thermal characteristics.

Purpose of the Study:

To experimentally investigate the stability of water-based nanofluids containing single wall carbon nanohorns (SWCNHs), titanium dioxide (TiO2), and copper oxide (CuO) nanoparticles.
To identify optimal dispersion techniques and dispersants for creating stable nanofluids with potential for improved thermal performance.

Main Methods:

Evaluated three dispersion techniques: sonication, ball milling, and high-pressure homogenization.
Investigated the impact of nanoparticle concentration and the use of specific dispersants (n-dodecyl sulphate, polyethylene glycol) on suspension stability.

Main Results:

High-pressure homogenization emerged as the most effective dispersion method for achieving stable nanofluids.
The addition of n-dodecyl sulphate and polyethylene glycol significantly enhanced the stability of SWCNHs-water and TiO2-water nanofluids, respectively.

Conclusions:

Stable water-based nanofluids can be prepared using optimized dispersion techniques and appropriate dispersants.
The findings provide a pathway for selecting and developing nanofluids with superior thermal properties for various applications.