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Innovative method prints colours without inks
Monday August 13, 2012 02:20:24 PM,
IANS
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Singapore: An
innovative method for creating sharp, full-spectrum colour images
at 100,000 dots per inch (dpi) does not need inks or dyes, thanks
to metal-laced nano-sized structures.
Conversely, current inkjet or laserjet printers can only achieve
up to 10,000 dpi, while research grade methods are able to
dispense dyes for only single colour images.
This novel breakthrough - achieved by Agency for Science,
Technology and Research Institute of Materials Research and
Engineering (IMRE) - allows colouring to be treated not as an
inking matter but as a lithographic matter, which can potentially
revolutionise the way images are printed, the journal Nature
Nanotechnology reports.
The inspiration for the research was derived from stained glass,
which is traditionally made by mixing tiny fragments of metal into
the glass. It was found that nanoparticles from these metal
fragments scattered light passing through the glass to give
stained glass its colours, according to a statement from the
Agency for Science.
Using a similar concept with the help of modern nanotech tools,
researchers precisely patterned metal nanostructures and designed
the surface to reflect the light to achieve the colour images.
"The resolution of printed colour images very much depends on the
size and spacing between individual 'nanodots' of colour,"
explained Karthik Kumar, a key researcher.
"The closer the dots are together and because of their small size,
the higher the resolution of the image. With the ability to
accurately position these extremely small colour dots, we were
able to demonstrate the highest theoretical print colour
resolution of 100,000 dpi," added Kumar.
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