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Critical role of coexistence order and interfacial forces in the aggregation of polystyrene nanoplastics induced by nano-SiO2 and metal cations
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Researchers investigated how the order of addition and interfacial forces between nano-silica (SiO2) particles and metal cations influence the aggregation behavior of polystyrene nanoplastics, using kinetic experiments with single, simultaneous, and sequential addition protocols. The study found that coexistence order critically determines aggregation dynamics, with implications for understanding nanoplastic fate in complex environmental matrices.
This study investigated the aggregation of polystyrene (PS) nanoplastics (NPs) by kinetic experiments, considering single, simultaneous, and sequential addition of silica (SiO 2 ) nanoparticles and metal cations.
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Molecular-level insight into the behavior of metal cations and organic matter during the aggregation of polystyrene nanoplastics
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Researchers used molecular dynamics simulations and experiments to show that organic matter and metal cations play competing roles in polystyrene nanoplastic aggregation — with bisphenol A displacing humic acid, and calcium more effective than magnesium at destabilizing particles despite magnesium's stronger binding to surface functional groups.
Effects of inorganic ions and natural organic matter on the aggregation of nanoplastics
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Researchers investigated how inorganic ions and natural organic matter (NOM) influence the aggregation of polystyrene nanoplastics, finding that iron ions uniquely promote aggregation while NOM can either suppress or enhance clumping depending on iron concentration, with electrostatic forces and surface chemistry governing overall particle stability.
Kinetic and thermodynamic investigation of nanoplastic stability in aquatic environments
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Researchers investigated how natural organic matter, salt types, and other aquatic colloids affect the aggregation stability of polystyrene nanoplastics in freshwater and saltwater conditions. The study found that multivalent cations caused nanoplastics to aggregate more rapidly, with implications for predicting how nanoplastics settle or remain suspended in natural water bodies.
Impact of iron/aluminum (hydr)oxide and clay minerals on heteroaggregation and transport of nanoplastics in aquatic environment
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Researchers examined how polystyrene nanoplastics interact with nine different minerals in aquatic environments, finding that positively charged iron and aluminum (hydr)oxide minerals readily form aggregates with nanoplastics through electrostatic and hydrophobic forces, while humic acid and shifting pH significantly suppress this aggregation.
Impact of CeO2 nanoparticles on the aggregation kinetics and stability of polystyrene nanoplastics: Importance of surface functionalization and solution chemistry
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Researchers used time-resolved dynamic light scattering to investigate how cerium dioxide nanoparticles influence the aggregation and stability of differently surface-functionalized polystyrene nanoplastics across multiple water chemistries. Results showed that CeO2 nanoparticles promoted heteroaggregation with nanoplastics, with natural organic matter and ionic strength modulating aggregate formation and the environmental mobility of nanoplastics.
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