Abstract
TiO2-N-methyldiethanolamine(MDEA)-H2O nanofluids were prepared by dispersing TiO2 nanoparticles in the 50wt% (mass fraction) MDEA solution. The stability of nanofluids was studied by the method of absorbance. Only with mechanical agitation, the nanofluids can keep stable at least 48 h without any dispersant. The surface tensions; kinematic viscosities and thermal conductivities of the MDEA solution were measured at the temperature of 20 °C when the TiO2 na-noparticles concentration was 0.05wt%, 0.2wt%, 0.4wt% and 0.8wt%. The results show that they all increase with increasing concentration of the nanoparticles. The maximum enhancement of the surface tension, kinematic viscosity and thermal conductivity is 0.6 %, 4.6 % and 5.9 % respectively at the concentration of 0.8 wt%. The influence of nanoparticles on CO2 bubble absorption in the MDEA solution was studied. It can be found that the CO2 absorption rate can be enhanced by 1.95%, 6.53%, 7.79%, 11.54% when the TiO2 nanoparticles concentration is 0.05wt%, 0.2wt%, 0.4wt% and 0.8wt% respectively. The possible mechanisms for the phenomena in experiments and related results are also explained.
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