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Confinement effect on solar thermal heating process of TiN solutions


We propose a theoretical approach to describe quantitatively the heating process in aqueous solutions of dispersed TiN nanoparticles under solar illumination. The temperature gradients of solution with different concentrations of TiN nanoparticles are calculated when confinement effects of the container on the solar absorption are taken into account. We find that the average penetration of solar radiation into the solution is significantly reduced with increasing the nanoparticle concentration. At high concentrations, our numerical results show that photons are localized near the surface of the solution. Moreover, the heat energy balance equation at the vapor-liquid interface is used to describe the solar steam generation. The theoretical time dependence of temperature rise and vaporization weight losses is consistent with experiments. Our calculations give strong evidence that the substantially localized heating near the vapor-liquid interface is the main reason for the more efficient steam generation process by floating plasmonic membranes when compared to randomly dispersed nanoparticles. The validated theoretical model suggests that our approach can be applied towards new predictions and other experimental data descriptions.

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Publication details

The article was received on 25 Jun 2019, accepted on 14 Aug 2019 and first published on 14 Aug 2019

Article type: Paper
DOI: 10.1039/C9CP03571K
Phys. Chem. Chem. Phys., 2019, Accepted Manuscript

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    Confinement effect on solar thermal heating process of TiN solutions

    A. Phan, N. B. Le, H. L. T. Nghiem, L. Woods, S. Ishii and K. Wakabayashi, Phys. Chem. Chem. Phys., 2019, Accepted Manuscript , DOI: 10.1039/C9CP03571K

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