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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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Dispersion of Nanomaterials in Aqueous Media: Towards Protocol Optimization
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Tuning the thermal diffusivity of silver based nanofluids by controlling nanoparticle aggregation.

Filippo Agresti1, Simona Barison, Simone Battiston

  • 1CNR-IENI, Corso Stati Uniti 4, I-35127 Padova, Italy.

Nanotechnology
|August 15, 2013
PubMed
Summary

Stable silver nanofluids were synthesized using a green method. Higher molecular weight poly-vinylpyrollidone (PVP) increased nanoparticle aggregation, enhancing thermal diffusivity by up to 12% for heat exchange applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Nanofluids offer enhanced thermal properties for heat exchange.
  • Controlling nanoparticle aggregation is crucial for stability and performance.
  • Surfactants play a key role in stabilizing nanoparticle suspensions.

Purpose of the Study:

  • To synthesize stable silver nanofluids using a green chemical method.
  • To investigate the impact of poly-vinylpyrollidone (PVP) molecular weight on nanoparticle aggregation.
  • To correlate nanoparticle aggregation with the thermal diffusivity of the nanofluids.

Main Methods:

  • Green synthesis of silver nanoparticles using fructose reduction of AgNO₃.
  • Stabilization of silver colloids with poly-vinylpyrollidone (PVP) of varying molecular weights.
  • Characterization using UV-Vis spectroscopy, DLS, ζ-potential, laser flash thermal diffusivity, SEM, and TGA.

Main Results:

  • PVP molecular weight significantly influenced nanoparticle ζ-potential and aggregation.
  • Increased PVP molecular weight led to reduced ζ-potential and increased nanoparticle aggregation.
  • A positive correlation was observed between nanoparticle aggregation and thermal diffusivity.

Conclusions:

  • The molecular weight of PVP is a critical factor in tuning silver nanofluid properties.
  • Higher nanoparticle aggregation, induced by higher molecular weight PVP, enhances thermal diffusivity.
  • These findings are valuable for developing stable nanofluids for heat exchange applications.