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This work experimentally investigated photothermal conversion behavior of Gold/water and MWCNT/water nanofluids at different volumetric concentrations (0.0001%-0.004% and 0.0001%-0.03%, respectively). The experiments were conducted for ~10 hours outdoor on each test day, without interruptions. The results show that the tested nanofluids have excellent photothermal conversion capability even under very low concentrations. Specific absorption rate (SAR) presented an exponential decay with increasing volumetric concentration of nanoparticles in the sample while both the total energy stored by the fluid sample during the heating period and the stored energy ratio (SER) increased with the increase in nanoparticles concentration. The results indicates the existence of an "optimal" volumetric concentration, above which further nanoparticle addition becomes indifferent or infeasible. This optimal nanoparticle volumetric concentration was found to be 0.002% for the gold nanofluid and 0.001% for the MWCNT samples.

AGRADECIMENTOS À Deus, porque sem Ele eu nada seria. Ao meu marido, Guilherme Oliveira, por toda ajuda, por todos os conselhos e pelo companheirismo durante o desenvolvimento deste trabalho. Aos meus pais, Adilson e Jusely, por sempre quererem para mim muito mais do que eles puderam ter, se sacrificando por isso, e pela incondicional prontidão em me ajudar. Ao técnico Reinaldo pela solicitude e trabalho sempre primoroso. Ao orientador Prof. Enio Pedone Bandarra Filho pelo direcionamento e auxílio no desenvolvimento deste projeto.

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