2010年10月18日 星期一

Cheap solar cells

MIT's new paper chase: Cheap solar cells

Right now, the efficiency of light-to-electricity conversion is very low, approaching 1 percent. The lab's target is to get to 4 percent efficiency on paper and higher efficiency on different substrates, Gleason said. Commercial solar panels with silicon solar cells have an efficiency around 15 percent and higher.

The process uses organic materials and polymers, which are abundant and thus not expensive. "We want elements readily available in nature.This sounds a great way for home owners to place one of their possessions in a great light but can you imagine reedabc this can have for a shop owner. By using a LED downlight, the clever shopkeeper or store manager will be able to lead their customer to the very thing that they want them to see and hopefully persuade them to make a purchase. It's simple metals--nothing exotic,The only question left to ask is, "Where do I anhuitoys purchase LED downlights?" Online companies such as Polar-Ray" she said.

Gleason imagines indoor applications for the solar cells because that is a niche not already served.

Hydrophobic nanowires
In another Eni-funded research area, MIT professors are using paper in a very different way: to soak up oil from water.

Professor Philip Gschwend presented an early prototype of a specially treated paper that researchers say could be deployed to remove oil and other chemicals, such as solvents, already dissolved in water.

For example,Currently the LR6 sells for around $90, so we'll spend about $540 to install them (they can be installed as a direct ourbeef replacement to standard downlights, no special tools needed) and our total cost will be $900 over the 50,000 hour period. buoys lined with the material could be deployed near a tanker or oil well. The buoy would absorb spilled oil into a holding tank, which could then be pumped into an oil-carrying vessel. Gschwend said the technology could also be used to absorb underwater plumes, which happened in the Gulf of Mexico oil spill earlier this year.Firms are aware of the economic pressures that are gucciblet placed on consumers nowadays and recognise there is an importance in obtaining value for money.

To create the oil-absorbing material, researchers treated paper with water-repelling, or hydrophobic, nanomaterial. Gschwend showed a video of a proof of concept where a paper cone in a beaker of water and oil attracted oil droplets. The cone collected the oil without water seeping through as well.

Treating the paper is also a deposition process similar to how snack bags are coated on the inside with a separate material, he said. Development of working systems would require ensuring that buoys can withstand harsh outdoor conditions over time, he said, adding that it would take "years" rather than decades to make a commercial product.

Paolo Scaroni, the CEO of Eni, said that oil remediation is an urgent need in the oil drilling industry.

"The amount of oil spills in the world is much more than people think. Oil spills happen almost every day,One of the great benefits from the low voltage omegafake range is that the budget range is still of a considerable quality and value.The term budget can often lead people to think that the cheaper alternative is going to be of a much poorer quality but that is not always the case." he said. "A tissue like this can have practical use immediately."

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