Assessing colloidal stability of long term MWCNTs based nanofluids

作者：Lamas Bruno^*; Abreu Bruno; Fonseca Alexandra; Martins Nelson; Oliveira Monica

来源：Journal of Colloid and Interface Science, 2012, 381: 17-23.

DOI：10.1016/j.jcis.2012.05.014

• Nanofluids
• Carbon nanotubes
• Dispersing methodologies
• Colloidal stability
• Analytical centrifuge
• Settling velocity
• Hydrodynamics of suspensions
• Hindered settling

This report presents an assessment on colloidal stability of functionalized multiwalled carbon nanorubes based nanofluids. To this end, an innovative technique that allows for measurement of settling velocity during centrifugation is applied. This method also enables measurements without dilution, inferring further accuracy to the experimental study. The results suggest that functionalization techniques enable the production of highly stable nanofluids. It is also found, that the colloidal stabilities of these nanofluids are characterized by hindered settling. The settling velocity decreases when the nanoparticles volume fraction rises from 0.25% to 1.50% due to the increase of interparticle interaction. Furthermore, a high aspect ratio of nanoparticles directly contributed to an increase in colloidal stability. It is expected that these results may significantly contribute to proper tailor of nanofluids engineering, ensuring a long term stable dispersion enhancing industrial application suitability.

• 出版日期2012-9-1