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20 resultsShowing papers similar to Effects of size and surface charge on the sedimentation of nanoplastics in freshwater
ClearThe difference of aggregation mechanism between microplastics and nanoplastics: Role of Brownian motion and structural layer force
The aggregation mechanisms of 100-nm and 1-micrometer polystyrene particles were compared under different water chemistry conditions to understand how microplastics and nanoplastics behave differently in aquatic environments. The study found distinct aggregation pathways between the two size classes, driven by differences in electrostatic forces and surface properties.
Aggregation and Deposition Kinetics of Polystyrene Microplastics and Nanoplastics in Aquatic Environment
Researchers measured aggregation and deposition kinetics of 50 nm and 500 nm polystyrene particles under varying ionic strength and pH conditions, finding that both particle sizes aggregated rapidly at elevated salt concentrations and that the smaller nanoplastics were more mobile in column experiments.
Settling behaviour of irregular-shaped polystyrene microplastics
Researchers studied the settling behavior of irregular-shaped polystyrene microplastics in water, finding that shape significantly affects how fast particles sink. Understanding settling behavior is important for predicting how microplastics distribute vertically in rivers and ocean water columns.
Aggregation kinetics of microplastics in aquatic environment: Complex roles of electrolytes, pH, and natural organic matter
Researchers found that the aggregation behavior of polystyrene microplastics in water was strongly influenced by pH, ionic strength, and the presence of natural organic matter, with divalent cations like calcium and magnesium promoting aggregation. Understanding aggregation kinetics is critical for predicting how microplastics partition between suspended and settled states in natural water bodies.
Influence of nanoplastic surface charge on eco-corona formation, aggregation and toxicity to freshwater zooplankton
Researchers examined how surface charge and natural organic matter influence the stability and toxicity of polystyrene nanoplastics to freshwater zooplankton. They found that positively charged nanoplastics were significantly more toxic than negatively charged ones, and that natural organic matter formed an eco-corona on the particles that reduced their toxicity. The study highlights that both particle surface properties and environmental conditions play critical roles in determining nanoplastic impacts on aquatic organisms.
Impact of electrolyte and natural organic matter characteristics on the aggregation and sedimentation of polystyrene nanoplastics
Researchers examined how dissolved organic matter from different water sources affects the aggregation and sedimentation of polystyrene nanoplastics under varied salt concentrations and temperatures, finding that biopolymers form a protective 'eco-corona' around particles that strongly inhibits long-term sedimentation, while temperature influences aggregation dynamics in complex ways.
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.
Impact of natural organic matter and inorganic ions on the stabilization of polystyrene micro-particles
Researchers investigated how natural organic matter (NOM) and inorganic ions affect the stabilization and aggregation behavior of polystyrene nanoplastics in water, finding that NOM enhanced colloidal stability while high ionic strength promoted aggregation. The results indicate that water chemistry plays a dominant role in determining nanoplastic mobility and persistence in natural freshwater environments.
Sedimentation behavior of aggregated microplastics: Influence of particle size and water constituents in environmental waters
Laboratory experiments investigated how aggregation of microplastics with sediments and organic matter affects their sinking rates in water, finding that aggregate composition strongly influences settling velocity. These findings improve models predicting whether microplastics sink to the seafloor or remain suspended in the water column.
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.
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.
Effect of salinity and humic acid on the aggregation and toxicity of polystyrene nanoplastics with different functional groups and charges
Researchers showed that surface charge governs nanoplastic behavior in water — higher salinity caused negatively charged nanoplastics to aggregate while positively charged particles remained stable — and that humic acid (dissolved organic matter) alleviated toxicity to Daphnia, increasing survival from 15% to nearly 100% in some cases.
[Effect of Water Components on Aggregation and Sedimentation of Polystyrene Nanoplastics].
Researchers investigated how sodium ions (Na+) and natural organic matter (NOM) affect the aggregation and sedimentation of polystyrene nanoplastics (PS-NPs) in six water types including seawater, lake water, and domestic sewage. They found that Na+ concentrations below 80 mmol/L facilitated PS-NP sedimentation, while NOM effects varied by water type, with findings informing the environmental fate and distribution of nanoplastics.
Impact of water chemistry on surface charge and aggregation of polystyrene microspheres suspensions
Researchers investigated how water chemistry factors such as pH, salt concentration, and humic acid affect the surface charge and aggregation behavior of polystyrene microspheres in aqueous solutions. The study found that higher ionic strength and lower pH promoted aggregation, while humic acid stabilized the particles, suggesting that water chemistry strongly influences the environmental fate and transport of microplastics.
Structural Compactness Governs the Environmental Fate of Polystyrene Nanoplastics: Reaggregation Mechanisms in Laboratory-Scale Aquatic Systems.
Scientists studied how tiny plastic particles from polystyrene (smaller than the width of a human hair) behave in water under different conditions like saltiness and water movement. They found that these plastic particles can break apart and stick back together, staying suspended in water for long periods and traveling far distances through rivers and oceans. This matters because it means these microscopic plastics could spread widely through water systems and potentially end up in our drinking water and food chain.
Heteroaggregation of nanoplastic particles in the presence of inorganic colloids and natural organic matter
Nanoplastics were found to heteroaggregate extensively with inorganic colloids and natural organic matter in both freshwater and marine conditions, altering their size, surface charge, and settling behavior compared to pristine particles. The study demonstrates that nanoplastic behavior in natural waters is dominated by interactions with other environmental constituents rather than the intrinsic properties of the plastic alone.
A method for efficient separation of polystyrene nanoplastics and its application in natural freshwater
Researchers developed a method using asymmetrical flow field-flow fractionation (AF4) coupled with multiple detectors to efficiently separate and characterize polystyrene nanoplastics by particle size in freshwater environments, demonstrating its applicability for analysing nanoplastic environmental behaviour in natural freshwater samples.
AQuantitative Relationshipbetween Settling and Wettabilityfor Weathered Microplastics in Aquatic Systems
Researchers quantified the relationship between surface wettability and settling velocity for weathered microplastics in aquatic systems, demonstrating that wettability-driven microscale changes at the particle-water interface modify drag forces and thus govern the transport and fate of submillimeter plastic particles.
Influence of Concentration, Surface Charge, and Natural Water Components on the Transport and Adsorption of Polystyrene Nanoplastics in Sand Columns
Laboratory column experiments showed that nanoplastics made of polystyrene behave very differently in groundwater depending on their surface charge — positively charged particles were retained much more readily in sand than negatively charged ones, and the presence of natural organic matter in real lake water reduced the retention of both types. These findings matter for understanding whether nanoplastics released into the environment will travel through soil and reach drinking water sources, which depends critically on the plastic's surface chemistry.
Impact of iron/aluminum (hydr)oxide and clay minerals on heteroaggregation and transport of nanoplastics in aquatic environment
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.