Archive for the ‘New materials’ Category

Solar cells in Colors

May 15, 2010

A dream in the green energy  has been developed. New transparent solar cells in colors . They can capture the indirect light not only direct sun rays.  With an efficiency of 12% and a low cost of  $2.1/W.

Their developers based in Jerusalem hope to improve this figures  almost to 20% and $ 0.98/W  for the next couple of years.  It is a fifth of the actual cost for the usual cells wich uses high percentage of silicium and not use fluorescent nanoparticles.

The possibilities for green architecture are open to imagination.

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Carbon nanotubes

May 6, 2010

This structures have amazing properties, that can break the limits imposed by other materials in conducting electricity, resistance among others. The remarkable fact is that superconductivity appears around 30K, what gives them an important place in the HCTS (High Critical Temperature Superconductors)

The predecessor carbon based structure was the C60 buckyball,

Both  are part of the same family compounds, the fullerenes,which are made of  graphene linked hexagonal rings; but they may also contain pentagonal (or sometimes heptagonal) rings.

The nanotubes are cylinders  that can be closed by a half  buckyball  in each extreme, may have only one wall or more, and different wrapping  angles in the way the graphite lattice was curved to form the cylinder. 

This is a great place to read about his Properties

The arc-evaporation method, which produces the best quality nanotubes, involves passing a current of about 50 amps between two graphite electrodes in an atmosphere of helium.
But if you don’t have a laboratory, you can do your virtual nanotubes with this superb application made by a research team of the Granada University (Spain)nanotubes simulation