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Precipitate Formation and Particle Size Control

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...

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Updated: Jul 23, 2025

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

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

Published on: October 16, 2017

Real-Time Monitoring and Control of Nanoparticle Formation.

Yujie Guo¹, Vivien Walter², Steven Vanuytsel¹

¹Department of Chemistry, King's College London, Britannia House, 7 Trinity Street, London SE1 1DB, U.K.

Journal of the American Chemical Society

|July 17, 2023

Summary

This summary is machine-generated.

Controlling nanoparticle synthesis in real time is crucial for nanomaterial engineering. This study uses patterned light activation and microscopy to monitor and control gold nanoparticle growth, improving reproducibility.

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Area of Science:

Nanomaterial Engineering
Physical Chemistry
Microscopy

Background:

Controlling synthesis at the individual nanoparticle level is essential for reproducible and scalable nanomaterial engineering.
Current methods often lack the precision for real-time control of nanoparticle growth dynamics.

Purpose of the Study:

To develop a method for fast, label-free monitoring and control of nanoparticle synthesis in real time.
To investigate the kinetics of individual gold nanoparticle growth under controlled conditions.

Main Methods:

Combining spatially patterned activation of the photoreductant sodium pyruvate with interferometric scattering microscopy.
Real-time monitoring and control of hundreds of gold nanoparticles simultaneously.

Main Results:

Achieved fast, label-free monitoring and control of gold nanoparticle synthesis.
Individual particle growth kinetics were accurately described by a two-step nucleation-autocatalysis model.
Demonstrated that individual rate constants vary with reaction conditions.

Conclusions:

The developed method enables precise control over nanoparticle synthesis, enhancing reproducibility and scalability.
Understanding the distribution of rate constants is key to optimizing nanomaterial fabrication.
This approach offers a powerful tool for advancing complex nanomaterial engineering.