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Ruby-Red Colloidal Gold Nanotechnology - Chemical Demonstration Kit

Ruby-Red Colloidal Gold Nanotechnology -
Chemical Demonstration Kit, AP7117
Catalog Number
Ruby-Red Colloidal Gold Nanotechnology - Chemical Demonstration Kit
Product Description

By: The Flinn Staff

Discover the beautiful properties of ruby-red colloidal gold in this introduction to nanotechnology demonstration. Reacting a very dilute solution of gold chloride in water with sodium citrate, a mild reducing agent, produces elemental gold. The gold particles are so small, 20 nanometers in diameter, that the “metallic” gold is uniformly dispersed in a stunning, transparent, ruby-red solution! Adding sodium chloride causes the particles to coagulate and the color shifts to purple or blue. Measure the visible absorption spectrum of colloidal gold to learn more about the optical properties of gold nanoparticles and their uses. Use this elegant demonstration to show what happens when solid particles “shrink” down to the nanometer scale, one-billionth of a meter. Enough materials are included to perform the demonstration seven times.
Concepts: Nanotechnology, colloids vs. solutions, measurements.
Time Required: 20 minutes
Materials Provided: Hydrogen tetrachloroaurate (gold chloride) solution, trisodium citrate solution, sodium chloride solution, and Beral-type pipets.


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