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Experimental stability analysis of different water-based nanofluids.

Fedele L, Colla L, Bobbo S, Barison S, Agresti F - Nanoscale Res Lett (2011)

Bottom Line: Different dispersion techniques were considered in this study, including sonication, ball milling and high-pressure homogenization.Both the dispersion process and the use of some dispersants were investigated as a function of the nanoparticle concentration.The high-pressure homogenization was found to be the best method, and the addition of n-dodecyl sulphate and polyethylene glycol as dispersants, respectively in SWCNHs-water and TiO2-water nanofluids, improved the nanofluid stability.

View Article: PubMed Central - HTML - PubMed

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

ABSTRACT
In the recent years, great interest has been devoted to the unique properties of nanofluids. The dispersion process and the nanoparticle suspension stability have been found to be critical points in the development of these new fluids. For this reason, an experimental study on the stability of water-based dispersions containing different nanoparticles, i.e. single wall carbon nanohorns (SWCNHs), titanium dioxide (TiO2) and copper oxide (CuO), has been developed in this study. The aim of this study is to provide stable nanofluids for selecting suitable fluids with enhanced thermal characteristics. Different dispersion techniques were considered in this study, including sonication, ball milling and high-pressure homogenization. Both the dispersion process and the use of some dispersants were investigated as a function of the nanoparticle concentration. The high-pressure homogenization was found to be the best method, and the addition of n-dodecyl sulphate and polyethylene glycol as dispersants, respectively in SWCNHs-water and TiO2-water nanofluids, improved the nanofluid stability.

No MeSH data available.


Nanoparticles size distribution for water containing 0.1 wt% SWCNH, dispersed by means of the homogenization method.without dispersant. At (thick line) day 1 and (dashed line) day 33.
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Figure 4: Nanoparticles size distribution for water containing 0.1 wt% SWCNH, dispersed by means of the homogenization method.without dispersant. At (thick line) day 1 and (dashed line) day 33.

Mentions: The SWCNHs nanofluid turned out to be quite stable. In fact, the mean size measured by DLS the first day was almost constant for 33 days, as shown by Figure 4. However, from day 5, a micrometric aggregate was found, indicating a partial instability of the solution. Moreover, the mean particle size in water was slightly higher than the size measured in the powder.


Experimental stability analysis of different water-based nanofluids.

Fedele L, Colla L, Bobbo S, Barison S, Agresti F - Nanoscale Res Lett (2011)

Nanoparticles size distribution for water containing 0.1 wt% SWCNH, dispersed by means of the homogenization method.without dispersant. At (thick line) day 1 and (dashed line) day 33.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211367&req=5

Figure 4: Nanoparticles size distribution for water containing 0.1 wt% SWCNH, dispersed by means of the homogenization method.without dispersant. At (thick line) day 1 and (dashed line) day 33.
Mentions: The SWCNHs nanofluid turned out to be quite stable. In fact, the mean size measured by DLS the first day was almost constant for 33 days, as shown by Figure 4. However, from day 5, a micrometric aggregate was found, indicating a partial instability of the solution. Moreover, the mean particle size in water was slightly higher than the size measured in the powder.

Bottom Line: Different dispersion techniques were considered in this study, including sonication, ball milling and high-pressure homogenization.Both the dispersion process and the use of some dispersants were investigated as a function of the nanoparticle concentration.The high-pressure homogenization was found to be the best method, and the addition of n-dodecyl sulphate and polyethylene glycol as dispersants, respectively in SWCNHs-water and TiO2-water nanofluids, improved the nanofluid stability.

View Article: PubMed Central - HTML - PubMed

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

ABSTRACT
In the recent years, great interest has been devoted to the unique properties of nanofluids. The dispersion process and the nanoparticle suspension stability have been found to be critical points in the development of these new fluids. For this reason, an experimental study on the stability of water-based dispersions containing different nanoparticles, i.e. single wall carbon nanohorns (SWCNHs), titanium dioxide (TiO2) and copper oxide (CuO), has been developed in this study. The aim of this study is to provide stable nanofluids for selecting suitable fluids with enhanced thermal characteristics. Different dispersion techniques were considered in this study, including sonication, ball milling and high-pressure homogenization. Both the dispersion process and the use of some dispersants were investigated as a function of the nanoparticle concentration. The high-pressure homogenization was found to be the best method, and the addition of n-dodecyl sulphate and polyethylene glycol as dispersants, respectively in SWCNHs-water and TiO2-water nanofluids, improved the nanofluid stability.

No MeSH data available.