Effect of Palmitoyl Nanogold Particles on the Thermal Properties of Phosphate Buffered Saline (PBS) Solutions
Avishek Guha and Ram Devireddy
Mechanical Engineering Department, Louisiana State University, Baton Rouge, LA 70802, USA.
ABSTRACT
Extensive studies document the effect of nanoparticles on thermal properties of fluids, such as thermal conductivity, although very few exist at subzero temperatures. The current study reports the effect of 1.4 nm palmitoyl nanogold particles (NPs) on the freezing properties of phosphate buffered saline (PBS) solutions with the help of a differential scanning calorimeter (DSC). The results show that NPs have a complex effect on the 2 properties of interest, i.e., homogeneous nucleation temperature (Th) and phase change temperature (or the melting temperature, Tm). The homogeneous nucleation temperature was significantly elevated at a concentration of 1 nM(nanomoles) /ml NPs with 0.167 (v/v) % DMSO and 3 nM/ml NPs with 0.50 (v/v) % DMSO concentration whereas at the other concentrations (1.2 nM/ml NPs with 0.20% DMSO, 1.5 nM/ml NPs with 0.25% DSMO and 6 nM/ml NPs with 1% DMSO) it was significantly depressed. A similar phenomenon was also noticed in the measured values of the melting temperature of PBS solutions.
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