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Related Concept Videos

Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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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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Related Experiment Video

Updated: Sep 24, 2025

Author Spotlight: Tracking Electrochemistry on Single Nanoparticles with Surface-Enhanced Raman Scattering Spectroscopy and Microscopy
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Single-Particle Electrochemical Imaging Provides Insights into Silver Nanoparticle Dissolution at the Solution-Solid

Di Jiang1,2, Hai-Bo Chen2, Xiao-Li Zhou1

  • 1Chinese Academy of Sciences Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei 230026, China.

ACS Applied Materials & Interfaces
|May 3, 2022
PubMed
Summary
This summary is machine-generated.

Studying silver nanoparticle dissolution is key to understanding their environmental impact. This research used advanced microscopy to track individual nanoparticles, revealing how they break down and interact with natural organic matter in water.

Keywords:
aggregationelectrochemistrynanoparticle dissolutionoxidation activityplasmonic imagingsingle particle

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Area of Science:

  • Environmental Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Nanoparticle dissolution is a critical environmental process influencing nanoparticle transformation and fate in aquatic systems.
  • Studying dissolution kinetics is challenging due to the coupling with nanoparticle aggregation.
  • Understanding silver nanoparticle (Ag NP) behavior is crucial for environmental risk assessment.

Purpose of the Study:

  • To investigate the dissolution process of Ag nanoparticles at the single-particle level.
  • To elucidate the influence of natural organic matter on Ag NP dissolution dynamics.
  • To develop and apply a technique for evaluating nanomaterial fate in aquatic environments.

Main Methods:

  • Utilized surface plasmon resonance microscopy for single-particle imaging of Ag nanoparticle dissolution.
  • Classified individual Ag nanoparticles and measured their dissolution dynamics.
  • Assessed the dual effect of natural organic matter (NOM) on Ag NP dissolution, validated with natural freshwater.

Main Results:

  • Enabled classification and dissolution measurement of individual Ag nanoparticles, overcoming aggregation challenges.
  • Correlated nanoparticle aggregation size with oxidation activity.
  • Demonstrated the dual effect of NOM on Ag NP dissolution, confirmed in real freshwater samples.

Conclusions:

  • Provides novel insights into the dissolution mechanisms of Ag nanoparticles in aquatic environments.
  • Highlights the capability of single-particle surface plasmon resonance microscopy for studying nanomaterial dissolution.
  • Offers a transferable technique for assessing the environmental fate of various nanomaterials.