process of chemically transforming an opal
british and canadian chemists, ian manners and geoffrey ozin (respectively) have developed synthetic opals that can change colors at a fast speed, when volts of electricity are applied to them. their ‘photonic ink’ (p-ink) material could be used in electronic books or advertising displays. the modified opals could also be used to build the next generation of flexible solar cells.
the opal based technology provides electrically tunable color of any wavelength. by coating the material onto an array of pixels, a full color display can be created wherein the color of each pixel can be varied at will.
‘electronic inks are already used in commercial products such as amazon’s kindle reader. most current
technologies use an electric field to manipulate drops of oil or pigment particles. the presence or absence
of a voltage makes pixels on the display appear light or dark, and most displays are confined to monochrome.
p-ink, however, can display any colour without using pigments. instead, it relies on the same effect that
generates shimmering colours in the semi-precious stone, opal.’
how the ‘p-ink’ technology worksread more: http://www.primidi.com/2008/12/28.html#a2397
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