Abstract of Papers Presented at Annual Meeting of the Gemmological Society of Japan
2019 Annual Meeting
Conference information

Abstracts of Lectures at 2019 Annual Meeting of the Gemmological Society of Japan
Approaches to utilize jewelry as an educational material
- Opal synthesis experiment by sol-gel method -
*Ayumi TakemotoToshiaki Tanabe
Author information

Pages 18


The sol-gel method of synthesizing silica glass from a liquid raw material is a simple experiment that can be performed at room temperature without heating. One experimental system can be used to give assignments for each student's goals. For example, simple operations such as reagent metering and mixing, comparison of catalysts, understanding of hydrolysis reaction and dehydration condensation reaction, understanding of light interference based on observation of play of color effect, yield from final product Calculation. It takes about two weeks before the synthesized silica glass precipitates and can be confirmed. This time, while trying to compare the products by catalysis in the experiment class, authors explained the play of color effect of gem opal and the structural color of insect wings.

Information related to the author
© 2019 The Gemmological Society of Japan
Previous article Next article