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Related Concept Videos

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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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Solution, Solubility, and Solubility Equilibrium
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Silver Nanoparticle Interactions with Surfactant-Based Household Surface Cleaners.

Islam M Radwan1,2, Phillip M Potter3, Dionysios D Dionysiou1

  • 1Department of Chemical and Environmental Engineering (ChEE), University of Cincinnati, Cincinnati, Ohio, USA.

Environmental Engineering Science
|October 22, 2021
PubMed
Summary

Interactions between silver nanoparticles (AgNPs) and household cleaners cause particle aggregation and incidental AgNP formation. Cationic surfactants showed more significant aggregation than anionic or nonionic surfactants.

Keywords:
aggregationenvironmental fate of nanomaterialssilver nanoparticlessurface chemistrysurface cleaning agents

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Area of Science:

  • Environmental Science
  • Nanotechnology
  • Materials Science

Background:

  • Silver nanoparticles (AgNPs) are widely used in consumer products for their antimicrobial properties.
  • Increased use of AgNPs raises concerns about environmental impact and human exposure.
  • AgNP interactions with household materials, like cleaning products, are probable during product use.

Purpose of the Study:

  • To investigate the interactions between surfactant-based cleaning products and AgNPs.
  • To understand how AgNP size and capping agents influence transformations.
  • To simulate AgNP changes during consumer use before environmental release.

Main Methods:

  • Utilized ultraviolet-visible (UV/Vis) spectroscopy, transmission electron microscopy-energy dispersive X-ray spectroscopy (TEM-EDX), and dynamic light scattering (DLS).
  • Examined interactions between one consumer AgNP product, two lab-synthesized AgNPs, and ionic silver with cationic, anionic, and nonionic surfactants.
  • Monitored changes in AgNP size, morphology, and chemical composition over a 60-minute exposure period.

Main Results:

  • Exposure to surfactants generally caused initial AgNP aggregation, likely due to capping agent disruption.
  • Cationic surfactants resulted in more significant AgNP aggregation compared to anionic and nonionic surfactants over 60 minutes.
  • Incidental AgNP formation was observed from the interaction of ionic silver with all tested surfactant types.

Conclusions:

  • Household cleaning products can alter the properties of silver nanoparticles.
  • The type of surfactant significantly influences the extent of AgNP aggregation.
  • Ionic silver can form new AgNPs upon interaction with surfactants, indicating potential environmental transformation pathways.