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Photoaging alters the aggregation behavior of functionalized nanoplastics differently: effects of leached organic matter and surface properties changes
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Photoaging alters the aggregation behavior of functionalized nanoplastics differently: effects of leached organic matter and surface properties changes
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This study found that UV photoaging of nanoplastics changes their surface chemistry and causes them to release organic compounds, but the downstream effect on how particles clump together (aggregation) differs markedly depending on what chemical groups are on the particle surface. This matters because aggregation behaviour controls whether nanoplastics sink or stay suspended in water, affecting which organisms are exposed and how far the particles travel.
Environmental Science Nano: Back cover
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Photoaging alters the surface properties and organic matter leaching of functionalized nanoplastics, which in turn changes how they aggregate in aquatic environments. Understanding these aggregation dynamics is critical for predicting the transport, bioavailability, and toxicity of nanoplastics in real-world conditions.
Aggregation and Aggregate Strength of Microscale Plastic Particles in the Presence of Natural Organic Matter: Effects of Ionic Valence
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Calcium ions promote stronger aggregation of polyethylene microplastic particles in the presence of natural organic matter through divalent bridging, producing more cohesive aggregates than monovalent potassium ions. Understanding how microplastics aggregate under different water chemistry conditions is important for predicting their transport, sedimentation, and bioavailability in natural aquatic environments.
Photoaging-induced variations in heteroaggregation of nanoplastics and suspended sediments in aquatic environments: A case study on nanopolystyrene
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Researchers investigated how photoaging affects the aggregation behavior of polystyrene nanoplastics with suspended sediments in water. They found that 30 days of photoaging retarded aggregation in sodium chloride solutions due to steric hindrance from leached organic matter, but promoted aggregation in calcium chloride solutions through calcium bridging of newly formed oxygen-containing surface groups. The study provides mechanistic insights into how environmental weathering changes the transport and fate of nanoplastics in aquatic systems.
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