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ICN2 Thesis Defence - Rocío Rodríguez 
Friday, 26 July 2019, 11:00
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PhD:Rocio Rodríguez

Director: CSIC Prof. Pedro Gomez-Romero, Dr Emigdio Chavez-Angel, ICREA Prof. Clivia Sotomayor Torres

Heat transfer fluids: From fundamental aspects of graphene nanofluids at room temperature to molten salts formulations for solar-thermal conversion


Heat transfer fluids and nanofluids constitute an important element in the industry and their performance is key to the successful application in technologies that go from heat management and cooling to heat exchangers in thermal-solar energy and electricity generation. These industries demand heat transfer fluids with a wider liquid temperature range and better thermal performance than the conventional fluids. The work reported in this thesis has tackled two different challenges related to heat transfer fluids and nanofluids. In the first place, a careful and systematic study of thermal, morphological, rheological, stability, acoustic and vibrational properties of surfactant-free graphene-based nanofluids was carried out. We observed a maximum increase of up to 48% in thermal conductivity and 18% in heat capacity of graphene-N,N-dimethylacetamide (DMAc) nanofluids. The blue shift of several Raman bands
(max. ~ 4 cm-1) with increasing graphene concentration in N,N-dimethylformamide and DMAc nanofluids suggested that graphene has the ability to affect solvent molecules at long-range, in terms of vibrational energy. These results shed some light on the mechanism behind the enhancement of the thermal conductivity in nanofluids. Furthermore, the mechanisms suggested in the literature to explain this enhancement were discussed and some of them were discarded.

The second line of research focused on the development and characterization of novel molten salts formulations with low-melting temperature and high thermal stability. In this regard, two novel formulations of six components based on nitrates with a melting temperature of 60-75 °C and a thermal stability up to ~ 500 °C were synthesized. Moreover, the complexity of the samples led to establish a series of experimental methods which are proposed for the melting temperature detection of these materials as an alternative to conventional calorimetry. These methods are Raman spectroscopy, three-omega technique, and optical transmission.

Location ICN2 Seminar Hall, ICN2 Building, UAB
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