Science & Technology
Scientists turn gold to purple
By T.K. Randall
January 28, 2011 · 17 comments
Image Credit: CC 2.0 Aram Dulyan
A new way to harvest energy from sunlight has been found as gold turns purple in a new experiment.
Professor Richard Watt and his students have found a new way to harvest energy from sunlight by using a common protein. In their experiments, they mixed citric acid with the protein and added dissolved gold powder. After being exposed to sunlight for roughly 20 minutes, the solution turned purple, showing that the gold had been 'donated' electrons. The gold atoms used this energy to bunch together, forming purple colored nanoparticles.
This reaction signalled that the protein had used the sunlight to excite the molecules in the citric acid, creating a transfer of energy. The discovery could potentially be used as a new 'green' energy source.
Professor Richard Watt and his chemistry students suspected that a common protein could potentially react with sunlight and harvest its energy -- similar to what chlorophyll does during photosynthesis.
Source: Science Daily
| Comments (17)
Please Login or Register to post a comment.