Thermal conductivity analysis of nanofluid through laser speckle method

Abstract The significance of laser interaction in assessing the stability of colloidal CeO 2 nanoparticles (NPs) in water medium is highlighted in this study. Utilizing the laser speckle technique, a non-destructive optical method, the activities of NPs synthesized in continuous wave (CW) mode are examined. The size of the cerium oxide NPs is determined through Particle Size Analyzer technique. The fluctuation in intensity of laser speckle scattered from various particles reflects the configuration of NPs in the base fluid medium, offering valuable insights into their stability. Further confirmation of NP stability is obtained through UV–Visible absorption spectroscopy. The examination of CeO 2 NPs in deionized water is conducted with a CW mode He–Ne laser operating at 632 nm. This laser interaction approach proves to be instrumental in evaluating the thermal properties of the prepared samples, particularly the thermal conductivity, which shows enhancements at varying concentrations and temperatures. The findings demonstrate the potential of fabricating CeO 2 -water nanofluids with improved thermal conductivity through laser interaction in a liquid medium, thereby eliminating the need for hazardous chemicals and vacuum conditions. This suggests promising applications in medium-temperature scenarios.