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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

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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Updated: Jun 3, 2026

Synthesis and Exfoliation of Discotic Zirconium Phosphates to Obtain Colloidal Liquid Crystals
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Synthesis and Exfoliation of Discotic Zirconium Phosphates to Obtain Colloidal Liquid Crystals

Published on: May 25, 2016

Electron transfer between colloidal ZnO nanocrystals.

Rebecca Hayoun1, Kelly M Whitaker, Daniel R Gamelin

  • 1Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, USA.

Journal of the American Chemical Society
|March 10, 2011
PubMed
Summary
This summary is machine-generated.

Photochemically charged zinc oxide (ZnO) nanocrystals enable electron transfer from small to large particles. These colloidal ZnO nanocrystals act as well-defined redox reagents for semiconductor nanostructure studies.

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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy

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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
13:15

Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy

Published on: July 18, 2014

Area of Science:

  • Nanotechnology
  • Materials Science
  • Photochemistry

Background:

  • Colloidal semiconductor nanocrystals offer unique electronic properties.
  • Controlling charge transfer in nanocrystal systems is crucial for applications.

Purpose of the Study:

  • To investigate photochemical charging of colloidal ZnO nanocrystals.
  • To study electron transfer dynamics between ZnO nanocrystals of different sizes.
  • To assess the suitability of these nanocrystals as redox reagents.

Main Methods:

  • Photochemical charging of dodecylamine-capped ZnO nanocrystals in toluene.
  • Electron Paramagnetic Resonance (EPR) spectroscopy to monitor conduction-band electrons.
  • Stopped-flow kinetics using UV band-edge absorption measurements.
  • Electron transfer studies between small and large ZnO nanocrystals and with methyl viologen.

Main Results:

  • Stable solutions of photochemically charged ZnO nanocrystals were achieved.
  • Quantitative electron transfer was observed from small to large ZnO nanocrystals, but not vice versa.
  • Electron transfer reactions were found to be very rapid, completing within milliseconds.
  • EPR g* values correlated with nanocrystal size, aiding monitoring.

Conclusions:

  • Soluble ZnO nanocrystals can be effectively charged and act as well-defined redox reagents.
  • Ligand-stabilized nanocrystals exhibit rapid and quantitative electron transfer, suitable for studying semiconductor nanostructures.
  • These findings open avenues for advanced applications in nanoscale electronics and photocatalysis.