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Carbon Nanotube Membranes for Water Purification « Nano Bugle

The nanotubes are arranged so that they are closely packed together in order that water flows through them as if traversing a pile of straws. The opening of the nanotubes is only a few nanometers, so that water molecules can pass through them, while bacteria, biological material and other impurities can not. Thus, the water obtained after passing through the nanotube is clean of impurities.

While traditional membranes in dirt are stored within the membrane, in these membranes such impurities are kept out of the nanotubes, facilitating cleaning.

Another possible application of such filters would be water desalination.

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Carbon nanotube ink writes RF devices on paper - nanotechweb.org

Technology update

Sep 10, 2009

Researchers from Romania and France are investigating whether tunable resistors, capacitors or inductors can be printed using inkjet technology on normal office paper designed for laserjet printing. Paper was chosen as a substrate because it behaves as a dielectric up to 3 GHz and is the cheapest flexible organic substrate.

Tunable electronic devices are essential for any RF device, including the group's concept of a radio on paper for use as a wireless tag or an environmental sensor.

The researchers' initial findings are encouraging. Their study, published in the journal Nanotechnology , demonstrates that simple, tunable, high-frequency devices (up to 100 MHz and beyond) can be fabricated by printing on paper using carbon nanotube inks containing various concentrations of double-walled carbon nanotubes functionalized to make the material soluble in water.

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