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Papers
20 resultsShowing papers similar to UV-induced aggregation of polystyrene nanoplastics: effects of radicals, surface functional groups and electrolyte
ClearAggregation kinetics of UV irradiated nanoplastics in aquatic environments
Researchers compared the aggregation behavior of fresh versus UV-aged polystyrene nanoplastics under various aquatic conditions. They found that UV aging altered the surface chemistry of nanoplastics, making them more stable in water and less likely to aggregate, which means they could remain suspended and bioavailable for longer periods. The study suggests that weathered nanoplastics may behave very differently from fresh particles in the environment, complicating risk assessments.
UV/ozone induced physicochemical transformations of polystyrene nanoparticles and their aggregation tendency and kinetics with natural organic matter in aqueous systems
Researchers weathered polystyrene nanoparticles with UV light and ozone and then tested their aggregation behavior in waters containing humic acid, lysozyme, and alginate, finding that weathering-induced oxygen-containing surface groups significantly altered aggregation kinetics in ways strongly dependent on which organic molecules were present.
Aggregation kinetics of different surface-modified polystyrene nanoparticles in monovalent and divalent electrolytes
Researchers investigated how surface chemistry and morphology affect the clumping behavior (aggregation kinetics) of polystyrene nanoplastics in water, finding that surface charge and functional groups strongly govern stability, while dissolved organic matter can either inhibit or promote aggregation depending on concentration and whether mono- or divalent ions are present.
Aggregation behavior of polystyrene nanoplastics: Role of surface functional groups and protein and electrolyte variation
Researchers studied how different surface coatings on polystyrene nanoplastics affect their tendency to clump together in water containing proteins and salts. They found that the type of surface functional group significantly changed how the particles aggregated, with proteins and electrolytes playing important roles in the process. The study helps explain how nanoplastics behave and transform as they move through natural water systems.
UV-weathering affects heteroaggregation and subsequent sedimentation of polystyrene microplastic particles with ferrihydrite
Researchers studied how UV weathering alters the heteroaggregation and sedimentation behaviour of 1-micrometre polystyrene microplastic particles with ferrihydrite (an iron oxy-hydroxide common in natural waters). They found that UV weathering changed the surface charge and properties of polystyrene particles, significantly affecting their aggregation with ferrihydrite at neutral pH and their subsequent removal from the water column by sedimentation.
UV-weathering affects heteroaggregation and subsequent sedimentation of polystyrene microplastic particles with ferrihydrite
UV weathering of polystyrene microplastics significantly altered their surface properties, increasing heteroaggregation with ferrihydrite iron colloids and accelerating particle sedimentation compared to pristine PS—demonstrating that environmental weathering substantially changes microplastic fate and removal in aquatic systems.
Effect of UV-exposure on size, morphology, and chemical structure of polystyrene nanospheres in suspension
Researchers investigated how UV exposure changes the size, morphology, and chemical structure of polystyrene nanospheres in suspension, simulating environmental weathering of nanoplastics. The study characterized how UV aging alters particle properties in ways relevant to their biological and environmental fate.
Photoaging alters the aggregation behavior of functionalized nanoplastics differently: effects of leached organic matter and surface properties changes
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.
Fate of polystyrene and polyethylene nanoplastics exposed to UV in water
Researchers found that UV irradiation progressively degrades polystyrene and polyethylene nanoplastics dispersed in water, causing them to become porous, fragment, and ultimately degrade completely, revealing the photochemical fate of nanoplastics in sunlit aquatic environments.
Photoaging-induced variations in heteroaggregation of nanoplastics and suspended sediments in aquatic environments: A case study on nanopolystyrene
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.
Impact of CeO2 nanoparticles on the aggregation kinetics and stability of polystyrene nanoplastics: Importance of surface functionalization and solution chemistry
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.
Aggregation kinetics and stability of biodegradable nanoplastics in aquatic environments: Effects of UV-weathering and proteins
Researchers investigated the aggregation behavior of biodegradable nanoplastics (PBAT) in aquatic environments, finding that UV weathering and protein presence significantly alter their colloidal stability and aggregation kinetics, which influences their environmental fate and transport.
Effect of UV-exposure on size, morphology, and chemical structure of polystyrene nanospheres in suspension
Researchers studied how UV exposure alters the size, morphology, and chemical structure of polystyrene nanospheres in suspension, providing mechanistic insight into nanoplastic weathering. The results showed that UV irradiation progressively changes particle surface chemistry and size distribution in ways relevant to environmental fate and toxicity.
ROS-mediated photoaging pathways of nano- and micro-plastic particles under UV irradiation
Researchers investigated the role of reactive oxygen species in the photoaging of nano- and micro-plastic particles under UV irradiation. The study found that bare polystyrene nanoparticles generated hydroxyl radicals and singlet oxygen, while surface coatings and larger particle sizes reduced ROS generation. The findings help explain the mechanisms by which UV exposure breaks down plastic particles in aquatic environments.
Thermodynamic investigation of nanoplastic aggregation in aquatic environments
Researchers used isothermal titration calorimetry combined with time-resolved dynamic light scattering to investigate the thermodynamics of polystyrene nanoplastic aggregation in aquatic environments, finding that solvation entropy was a major determinant of aggregation behavior and that stability in natural water was correlated with ionic strength and the presence of metal oxides and clay colloids.
Mechanistic understanding of the aggregation kinetics of nanoplastics in marine environments: Comparing synthetic and natural water matrices
Researchers investigated aggregation kinetics of polystyrene nanoplastics in marine environments, finding that organic matter type and salt concentration strongly influenced particle stability, with nanoplastics in natural seawater aggregating differently than in synthetic matrices.
Swelling-Induced Fragmentation and Polymer Leakage of Nanoplastics in Seawater
Researchers tracked polystyrene nanoplastics in seawater over 29 days under simulated sunlight and found that light accelerates aggregation, while also inducing swelling and fragmentation of particles and leaching of polymer components, complicating predictions of nanoplastic fate and risk in marine environments.
Investigation of Surface Alteration of Microplastics by Using UV Irradiation
UV radiation causes polystyrene and other plastic microparticles to undergo photooxidative degradation, changing their surface chemistry and potentially making them more likely to adsorb or release chemical pollutants. Understanding these weathering processes is important for predicting the environmental behavior and toxicity of microplastics.
Aquatic behavior and toxicity of polystyrene nanoplastic particles with different functional groups: Complex roles of pH, dissolved organic carbon and divalent cations
Researchers systematically examined how water chemistry — pH, dissolved organic carbon, and divalent calcium and magnesium ions — affects the stability, aggregation, and toxicity of polystyrene nanoplastics with different surface functional groups, finding that complex solution conditions enhanced aggregation through cation bridging and increased oxidative gut damage in Daphnia magna.
Aggregation and stability of sulfate-modified polystyrene nanoplastics in synthetic and natural waters
Researchers studied how polystyrene nanoplastics behave in different water conditions, examining aggregation and stability under varying pH, salt types, and natural organic matter concentrations. The study found that nanoplastics remain highly stable and suspended in freshwater and even wastewater, but aggregate rapidly and settle in seawater. Natural organic matter was identified as the most significant factor affecting nanoplastic aggregation in waters with high ionic strength.