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The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...

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Related Experiment Video

Updated: Jul 16, 2026

Aerosol-assisted Chemical Vapor Deposition of Metal Oxide Structures: Zinc Oxide Rods

Aerosol-assisted Chemical Vapor Deposition of Metal Oxide Structures: Zinc Oxide Rods

Published on: September 14, 2017

Zinc oxide colloids with controlled size, shape, and structure.

Mihaela Jitianu¹, Dan V Goia

¹Clarkson University/Center for Advanced Materials Processing, Potsdam, NY 13699, USA.

Journal of Colloid and Interface Science

|March 3, 2007

Summary

Uniform zinc oxide (ZnO) particles were synthesized using Arabic gum as a stabilizer. Reaction conditions like temperature and reactant concentrations precisely controlled particle size, shape, and structure.

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Aerosol-assisted Chemical Vapor Deposition of Metal Oxide Structures: Zinc Oxide Rods

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Published on: September 27, 2024

Area of Science:

Materials Science
Nanotechnology
Inorganic Chemistry

Background:

Controlling nanoparticle morphology is crucial for advanced material applications.
Developing scalable synthesis methods for uniform zinc oxide (ZnO) particles remains a key challenge.
Arabic gum offers potential as a green stabilizer in nanoparticle synthesis.

Purpose of the Study:

To investigate the synthesis of highly dispersed, uniform ZnO particles with controlled sizes and shapes.
To explore the influence of reaction parameters on ZnO particle formation and morphology.
To propose a mechanism for the formation of geometrically defined polycrystalline ZnO particles.

Main Methods:

Parallel addition of zinc salt and sodium hydroxide solutions into aqueous Arabic gum.
Varying reaction temperatures (ambient to 600°C) and reactant concentrations.
Characterization of particle size, phase, and morphology using established techniques.

Main Results:

Well-defined zinc oxide phase formed, with particle sizes ranging from 100 to 300 nm.
Reaction temperature significantly impacted precursor nanoparticle size (10 nm at ambient vs. 44 nm at 600°C) and aggregate structure.
Ambient temperature yielded spherical aggregates; 600°C produced uniform hexagonal ZnO prisms.
Aspect ratio and internal structure were tunable via zinc salt type, addition rate, and reactant concentration.

Conclusions:

A two-stage mechanism for forming uniform polycrystalline ZnO particles with defined shapes is proposed.
Arabic gum facilitates the synthesis of controlled ZnO nanostructures.
The study demonstrates a method for tailoring ZnO particle morphology for potential applications.