Figure 8 | Scientific Reports

Figure 8

From: Efficient Volumetric Absorption Solar Thermal Platforms Employing Thermally Stable - Solar Selective Nanofluids Engineered from Used Engine Oil

Figure 8

(a) Spectral optical characteristics, and (b) hydrodynamic particle size distribution of the as-prepared and after heating (for 12 hours at 300 °C) nanofluid samples; and (c) spectral optical characteristics, and (d) hydrodynamic particle size distribution of the as-prepared and after heating (for 72 hours at 300 °C) nanofluid samples (5 ml/L); tested under airtight conditions.

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