sarahkeenihan

Day 128. Five bulk gold rings

In December 2012 on December 18, 2012 at 2:27 pm

bulk gold

On the 5th day of Christmas, ScienceforLife gave to me:

*My 5 most-worn rings – sentimental favourites, being gifts from my husband and parents – are made from ‘bulk gold’. As explained by TechNYou, bulk gold is familiar to us all as a relatively soft, stable metal which conducts heat and electricity well. The colour of bulk gold is…..gold, a result of the wavelength of light scattered from the surface of the mass of gold atoms held together by metallic bonds.

Gold can also exist stably at the nanoscale, many thousands of times smaller than the width of a human hair. Instead of metallic bonds creating a mass structure, nanogold consists of small aggregations of gold atoms.  In solution, light scattered from nanogold can appear red, green, blue or even black depending on the size of the gold particles and this distances between the particles. Stained glass windows made during mediaeval times contained nanogold at varying concentrations to produce different colours.

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