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Practical Applications of Chemistry
Nanotechnology, continued
Liquid Crystals—How Do They Do That?
Chemical Demonstration Kit
By: The Flinn Staff
Combine two clear liquids and heat them, then watch as the mixture produces vivid color changes from red to green to blue as it cools. From skin mapping to circuit board testing to mood rings, liquid crystals have amazing modern applications. Liquid crystals have properties that are in between those of solid and liquids—molecules move independently as in a liquid, but they also tend to orient or align themselves, like a crys- talline solid. The alignment of the molecules changes with temperature and produces fascinating color changes. A simple introduction to the world of nanotechnology! Instructor’s Demonstration Notes, reproduc- ible student worksheets, and answer sheet are included.
Concepts: Liquid crystals, nanotechnology, phases of matter, light reflection and transmission.
Time Required: 20 minutes
Chemicals Provided: Cholesteryl oleyl carbonate and cholesteryl pelargonate (liquid crystals).
Ruby-Red Colloidal Gold Nanotechnology—
Chemical Demonstration Kit 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! Measure the visible absorption spectrum of colloidal gold to learn more about the optical properties of gold nanoparticles and their uses. Use this elegant demon- stration to show what happens when solid particles “shrink” down to the nanometer scale, one-billionth of a meter.
Concepts: Nanotechnology, colloids vs. solutions, measurements. Time Required: 20 minutes
Materials Provided: Hydrogen tetrachloroaurate (gold chloride) solu- tion, trisodium citrate solution, sodium chloride solution, Beral-type pipets.
See free video at flinnsci.com.
Ferrofluid Lava Lamp
Spark student curiosity with the Ferrofluid Lava Lamp! A perfect addi- tion to your science decor and a great way to introduce many scientific concepts. This scientific twist to the traditional lava lamp involves a tangible manipulation of the nano-sized magnetic particles suspended in a liquid--the ferrofluid. Simply hold magnets of various strength close to the lamp and watch 3-D magnetic sculptures form. Includes three sets of magnets in varying strengths of low to high. 5" W x 151⁄2" H.
1-800-452-1261
flinnsci.com
Liquid Crystals—How Do They Do That? Chemical Demonstration Kit AP7195
Ruby-Red Colloidal Gold Nanotechnology— Chemical Demonstration Kit AP7117
Ferrofluid Lava Lamp AP9700
196
Catalog No.
Description
Price/Each
AP7195
Liquid Crystals—How Do They Do That? Chemical Demonstration Kit
$39.65
Catalog No.
Description
Price/Each
AP7117
Ruby-Red Colloidal Gold Nanotechnology— Chemical Demonstration Kit
$38.65
Catalog No.
Description
Price/Each
AP9700
Ferrofluid Lava Lamp
$99.95
AP5666
Neodymium Magnet
12.30
NANOTECHNOLOGY continued on next page.