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Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
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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Related Experiment Video

Updated: Jun 26, 2026

A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates
08:09

A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates

Published on: May 10, 2014

Drying-mediated self-assembly of nanoparticles.

Eran Rabani1, David R Reichman, Phillip L Geissler

  • 1School of Chemistry, Tel Aviv University, Tel Aviv 69978, Israel. rabani@tau.ac.il

Nature
|November 25, 2003
PubMed
Summary

Nanoparticle self-assembly during solvent evaporation forms complex structures. A new model reveals two ordering mechanisms, guiding the design of novel nanoscale devices.

Area of Science:

  • Materials Science
  • Physical Chemistry
  • Chemical Engineering

Background:

  • Systems far from equilibrium can display complex structures not seen at equilibrium.
  • Nanoparticle self-assembly during solvent evaporation is a non-equilibrium process.
  • Previous models neglected the significant role of solvent fluctuations on the nanoscale.

Purpose of the Study:

  • To develop a coarse-grained model of nanoparticle self-assembly that includes evaporating solvent dynamics.
  • To explain the formation of intricate structures observed during nanocrystal solution evaporation.
  • To predict novel network structures and guide the design of self-organized nanoscale devices.

Main Methods:

  • Development of a coarse-grained computational model.

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Liquid-cell Transmission Electron Microscopy for Tracking Self-assembly of Nanoparticles
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Liquid-cell Transmission Electron Microscopy for Tracking Self-assembly of Nanoparticles

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Fabrication of Spherical and Worm-shaped Micellar Nanocrystals by Combining Electrospray, Self-assembly, and Solvent-based Structure Control
06:16

Fabrication of Spherical and Worm-shaped Micellar Nanocrystals by Combining Electrospray, Self-assembly, and Solvent-based Structure Control

Published on: February 11, 2018

Related Experiment Videos

Last Updated: Jun 26, 2026

A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates
08:09

A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates

Published on: May 10, 2014

Liquid-cell Transmission Electron Microscopy for Tracking Self-assembly of Nanoparticles
08:39

Liquid-cell Transmission Electron Microscopy for Tracking Self-assembly of Nanoparticles

Published on: October 16, 2017

Fabrication of Spherical and Worm-shaped Micellar Nanocrystals by Combining Electrospray, Self-assembly, and Solvent-based Structure Control
06:16

Fabrication of Spherical and Worm-shaped Micellar Nanocrystals by Combining Electrospray, Self-assembly, and Solvent-based Structure Control

Published on: February 11, 2018

  • Simulations incorporating the dynamics of evaporating solvent.
  • Analysis of spatial and temporal patterns of nanoparticle aggregation.

    • Main Results:

    • The model accurately reproduces observed spatial and temporal patterns in nanoparticle self-assembly.
    • Two distinct ordering mechanisms (homogeneous and heterogeneous evaporation) were identified.
    • The study predicts previously unexplored network structures.

    Conclusions:

    • The model provides a comprehensive understanding of nanoparticle self-assembly driven by solvent evaporation.
    • The findings offer a guide for designing statistically patterned nanoparticle arrays.
    • This research opens possibilities for fabricating spontaneously organized nanoscale devices.