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Absorption and scattering properties of carbon nanohorn-based nanofluids for direct sunlight absorbers.

Mercatelli L, Sani E, Zaccanti G, Martelli F, Di Ninni P, Barison S, Pagura C, Agresti F, Jafrancesco D - Nanoscale Res Lett (2011)

Bottom Line: Scattered light was found to be not more than about 5% with respect to the total attenuation of light.Both these effects, together with the possible chemical functionalization of carbon nanohorns, make this new kind of nanofluids very interesting for increasing the overall efficiency of the sunlight exploiting device.PACS: 78.40.Ri, 78.35.+c, 78.67.Bf, 88.40.fh, 88.40.fr, 81.05.U.

View Article: PubMed Central - HTML - PubMed

Affiliation: National Institute of Optics, National Council of Research, Firenze, 50125, Italy. elisa.sani@ino.it.

ABSTRACT
In the present work, we investigated the scattering and spectrally resolved absorption properties of nanofluids consisting in aqueous and glycol suspensions of single-wall carbon nanohorns. The characteristics of these nanofluids were evaluated in view of their use as sunlight absorber fluids in a solar device. The observed nanoparticle-induced differences in optical properties appeared promising, leading to a considerably higher sunlight absorption with respect to the pure base fluids. Scattered light was found to be not more than about 5% with respect to the total attenuation of light. Both these effects, together with the possible chemical functionalization of carbon nanohorns, make this new kind of nanofluids very interesting for increasing the overall efficiency of the sunlight exploiting device. PACS: 78.40.Ri, 78.35.+c, 78.67.Bf, 88.40.fh, 88.40.fr, 81.05.U.

No MeSH data available.


Related in: MedlinePlus

Extinction coefficient as a function of SWCNH concentration, for the whole investigated concentration range. The desired large range of optical densities was obtained applying the described dilution method for increasing the SWCNH original concentrations. For clarity reasons, only the points corresponding to the original concentrations are shown.
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Figure 1: Extinction coefficient as a function of SWCNH concentration, for the whole investigated concentration range. The desired large range of optical densities was obtained applying the described dilution method for increasing the SWCNH original concentrations. For clarity reasons, only the points corresponding to the original concentrations are shown.

Mentions: To evaluate the extinction coefficient and its linearity for a large range of SWCNH concentrations, the described dilution method was applied to various samples, i.e. for different starting SWCNH concentrations, as explained above. Each original concentration showed a linear behaviour of extinction coefficient versus diluted concentration. On the other hand, different original concentrations showed themselves an overall linear trend (Figure 1). According to the method, the slope of the straight line that best fits the results for each original concentration represents the specific extinction coefficient of SWCNHs at the laser wavelength, that results εenh = 12.1 mm-1 g/l and it is the same for all the investigated original concentrations and in the whole concentration range.


Absorption and scattering properties of carbon nanohorn-based nanofluids for direct sunlight absorbers.

Mercatelli L, Sani E, Zaccanti G, Martelli F, Di Ninni P, Barison S, Pagura C, Agresti F, Jafrancesco D - Nanoscale Res Lett (2011)

Extinction coefficient as a function of SWCNH concentration, for the whole investigated concentration range. The desired large range of optical densities was obtained applying the described dilution method for increasing the SWCNH original concentrations. For clarity reasons, only the points corresponding to the original concentrations are shown.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211347&req=5

Figure 1: Extinction coefficient as a function of SWCNH concentration, for the whole investigated concentration range. The desired large range of optical densities was obtained applying the described dilution method for increasing the SWCNH original concentrations. For clarity reasons, only the points corresponding to the original concentrations are shown.
Mentions: To evaluate the extinction coefficient and its linearity for a large range of SWCNH concentrations, the described dilution method was applied to various samples, i.e. for different starting SWCNH concentrations, as explained above. Each original concentration showed a linear behaviour of extinction coefficient versus diluted concentration. On the other hand, different original concentrations showed themselves an overall linear trend (Figure 1). According to the method, the slope of the straight line that best fits the results for each original concentration represents the specific extinction coefficient of SWCNHs at the laser wavelength, that results εenh = 12.1 mm-1 g/l and it is the same for all the investigated original concentrations and in the whole concentration range.

Bottom Line: Scattered light was found to be not more than about 5% with respect to the total attenuation of light.Both these effects, together with the possible chemical functionalization of carbon nanohorns, make this new kind of nanofluids very interesting for increasing the overall efficiency of the sunlight exploiting device.PACS: 78.40.Ri, 78.35.+c, 78.67.Bf, 88.40.fh, 88.40.fr, 81.05.U.

View Article: PubMed Central - HTML - PubMed

Affiliation: National Institute of Optics, National Council of Research, Firenze, 50125, Italy. elisa.sani@ino.it.

ABSTRACT
In the present work, we investigated the scattering and spectrally resolved absorption properties of nanofluids consisting in aqueous and glycol suspensions of single-wall carbon nanohorns. The characteristics of these nanofluids were evaluated in view of their use as sunlight absorber fluids in a solar device. The observed nanoparticle-induced differences in optical properties appeared promising, leading to a considerably higher sunlight absorption with respect to the pure base fluids. Scattered light was found to be not more than about 5% with respect to the total attenuation of light. Both these effects, together with the possible chemical functionalization of carbon nanohorns, make this new kind of nanofluids very interesting for increasing the overall efficiency of the sunlight exploiting device. PACS: 78.40.Ri, 78.35.+c, 78.67.Bf, 88.40.fh, 88.40.fr, 81.05.U.

No MeSH data available.


Related in: MedlinePlus