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Related Concept Videos

The Colloidal State01:29

The Colloidal State

184
The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
184
Colloidal precipitates01:09

Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Forming Micro-and Nano-Plastics from Agricultural Plastic Films for Employment in Fundamental Research Studies
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PFAS-Induced Charge Regulation and Aggregation in Polystyrene Nanoplastic Colloids.

Tamás Péter1, Dóra Takács1, Bojana Katana1,2

  • 1MTA-SZTE Momentum Biocolloids Research Group, Department of Physical Chemistry and Materials Science, Interdisciplinary Centre of Excellence, University of Szeged, H-6720 Szeged, Hungary.

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|April 30, 2026
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Summary
This summary is machine-generated.

The adsorption of perfluoroalkyl and polyfluoroalkyl substances (PFASs) onto nanoplastics (NPLs) influences their aggregation. PFASs can neutralize NPL charge, causing aggregation, or stabilize them depending on concentration and ionic strength.

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Area of Science:

  • Environmental Chemistry
  • Colloid and Surface Science
  • Nanotechnology

Background:

  • The co-occurrence of nanoplastics (NPLs) and perfluoroalkyl and polyfluoroalkyl substances (PFASs) in aquatic environments poses a significant emerging risk.
  • Understanding the physicochemical interactions governing the colloidal and interfacial behavior of NPLs and PFASs is crucial but remains poorly understood.

Purpose of the Study:

  • To investigate the particle charge and aggregation mechanisms of polystyrene NPLs in the presence of C8 PFASs with varying head groups.
  • To elucidate how PFAS adsorption influences the colloidal stability of NPLs in aqueous systems.

Main Methods:

  • Comprehensive study of particle charge and aggregation of polystyrene NPLs.
  • Experiments conducted in the presence of C8 PFASs with different head groups.
  • Analysis of PFAS adsorption, charge neutralization, and reversal on NPLs.

Main Results:

  • PFAS adsorption led to charge neutralization and reversal on NPLs at specific mass ratios, inducing rapid aggregation near isoelectric points.
  • At low and high PFAS concentrations, significant particle charge resulted in electrostatically stabilized colloids.
  • Dispersion stability was sensitive to ionic strength at partial PFAS coverage but insensitive at high adsorption levels.

Conclusions:

  • PFAS adsorption significantly alters the colloidal and interfacial behavior of NPLs in aquatic systems.
  • The findings provide critical physicochemical insights into the aggregation processes of NPLs and PFASs, relevant for environmental risk assessment.