In Section 2, some of the temperature calculations were presented. From the experimentally derived values of QV = 4.81×10 , 1.03×10 , and 1.73×10 [W m ], the maximum temperatures within the laser spot obtained through FEM were 34.7°C, 45.7°C, and 59.3°C, respectively. In this section, based on these results, BDSs of the thermophoretic behavior of PSNPs, as described in In this discussion, we emphasize that engaging in overly detailed arguments, such as quantifying the exact percentage agreement between experimental and computational results, is not physically meaningful at the current stage of MST research. As shown in Figs. , the calculated concentration profile is predominantly determined by the thermal diffusion coefficient DT (or equivalently the Soret coefficient ST, though DT is more practical for computational purposes). As widely documented in the literatures, DT or ST can vary significantly depending on the colloidal sample and experimental setup. In general, for many transport processes driven by thermophoresis, DT(T) is reported to be in the range of 1×10⁻¹² to 1×10⁻¹¹ [m² s⁻¹ K⁻¹]. On the other hand, recent quantitative measurements have shown that for carboxyl-modified PSNPs, DT(T) tends to be slightly lower, around 1×10⁻ 13 [m² s⁻¹ K⁻¹]. The bare-PSNPs typically exhibit higher DT(T) values than carboxyl-modified ones. In this study, we used the bare-PSNPs, and thus referred to the DT(T) values from the work by Tsuji et al., which used similar samples.