Kim, Min Ji Herchenova, Yuliia Chung, Jae shik NA, SANG HEON Kim, Eun Ju 2024-01-12T02:35:50Z 2024-01-12T02:35:50Z 2022-10-28 2022-11 0043-1354 https://pubs.kist.re.kr/handle/201004/75957 In this study, the aggregation behavior of polystyrene nanoplastics (PS NPs) in the absence or presence of oppositely charged particulate matters is systematically investigated for a wide range of electrolyte conditions. Herein, we used isothermal titration calorimetry combined with time-resolved dynamic light scattering to provide kinetic and thermodynamic insights into the NP aggregation. The thermodynamic profiles of homoaggregation and heteroaggregation were fit using an independent site and two independent sites models, respectively, demonstrating different interaction modes of both aggregation processes. We found that the contribution of solvation entropy was significant and variable in most cases, and this thermodynamic parameter was a large determinant of the thermodynamics of NP aggregation. Furthermore, the stability of PS NPs in natural water matrices was found to be correlated with ionic strength and the content of natural colloids (e.g., metal oxides and clay particles). These results point to the importance of considering the role of thermodynamic variables when studying the fate of NPs within various environmental conditions. English Elsevier BV Thermodynamic investigation of nanoplastic aggregation in aquatic environments Article 10.1016/j.watres.2022.119286 1 Water Research, v.226 Water Research 226 Y scie scopus 000879879900003 Engineering, Environmental Environmental Sciences Water Resources Engineering Environmental Sciences & Ecology Water Resources Article DIFFERENT FUNCTIONAL-GROUPS GRAPHENE OXIDE IONIC-STRENGTH HETEROAGGREGATION NANOPARTICLES PARTICLES STABILITY TOXICITY COLLOIDS COMPLEX Nanoplastics Heteroaggregation Isothermal titration calorimetry Ionic strength Entropy