With the development of nanoparticle synthesis technique, extensive studies into the nanofluids have been performed in the past decade. First of all, since anomalously increased thermal conductivity of nanofluids were reported in 2001, in which copper nanoparticles and CNTs were dispersed into ethylene glycol and into oil, respectively [4,5], an immense number of experimental studies about the thermal conductivity of nanofluids was performed with various nanoparticles [6–9]. Theoretical studies, as well as the experimental works, suggested several possible mechanisms to understand and to explain the enhanced thermal conductivity of nanofluids . Additionally, research into the effect of nanoparticles on pool boiling characteristics and on the critical heat flux was also actively conducted under various experimental conditions [11–13]. While many people focused on the thermal conductivity and the boiling heat transfer of nanofluids, relatively a small number of studies was performed to measure specific heat capacity of the nanofluids. In 2008, Zhou and Ni reported that the specific heat capacity of water-based Al2O3 nanofluid was decreased with increase of the nanoparticle concentration . Similarly, Vajjha and Das measured the specific heat capacity for three different water/ethylene glycol based nanofluids using nanoparticles of Al2O3, ZnO, and SiO2 . They also obtained decreased specific heat capacity values compared with pure base fluids. Recently, Zhou and collaborators reported the similar results (decrease) for the specific heat capacity of ethylene glycol–CuO nanofluids . While it was observed for the specific heat capacity to be decreased in several literatures, there were previous studies showing the enhanced specific heat capacity. In 2009, Nelson et al. measured the specific heat capacity of a polyalphaolefin (PAO) nanofluid with graphite nanoparticle fibers . They measured a drastic enhancement of up to 50% by adding 0.6 wt.% of the nanoparticle in the PAO nanofluid. Shin and Banerjee observed the enhanced specific heat capacity by doping with silica nanoparticles in some molten salt eutectic such as the carbonate salt eutectic and chloride molten salt eutectic [18–20]. Bridges and collaborators  reported that the volumetric heat capacity of an ionic liquid was enhanced by doping with alumina nanoparticles by up to 45%. Most recently, Jo and Banerjee reported the enhanced specific heat capacity of molten salt nanomaterials in both liquid and solid phase [22,23]. They showed the effect of base materials  and dispersion homogeneity  on the specific heat capacity enhancement.