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December 08, 2005

Shimmering colours which change with temperature

Nail polish and expensive cars can nowadays shimmer in many colours, thanks to progress in the field of colloid chemistry, the chemistry of small particles. The bright colours in modern finishes are created because the light is reflected at layers of regularly arranged colloid particles. Individual colours are either removed or strengthened; the thickness of the layers -- what is known as the "lattice constant" -- determines the colour. Because we can nowadays tailor the spherical shape and the surface of the particles, we can produce optimised crystals with the desired lattice constant in the range of visible light.

The team of researchers from the Max Planck Institute of Colloids and Interfaces, led by Dr Wang, has now produced particles that do not interact with their neighbours in spherically symmetric ways. So they placed a colloidal crystal on a surface (image 2) and bombarded it with reactive ions, reducing the particles in the upper layer to the desired size and expanding the free surfaces between the colloids.
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Posted by thinkingmachine at December 8, 2005 08:25 AM

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