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Message: <blockquote data-quote="ibnanv" data-source="post: 16538377" data-attributes="member: 218596">Meet 'photoswitches,' a breakthrough set of materials that act as their  own batteries, absorbing energy and releasing it on demand.The next big thing in solar energy could be microscopic.  Scientists at MIT and Harvard University have devised a way to store  solar energy in molecules that can then be tapped to heat homes, water  or used for cooking.  The best part: The molecules can store the heat forever and be  endlessly re-used while emitting absolutely no greenhouse gases.   Scientists remain a way’s off in building this perpetual heat machine  but they have succeeded in the laboratory at demonstrating the viability  of the phenomenon called photoswitching.“Some molecules, known as photoswitches, can assume either of two  different shapes, as if they had a hinge in the middle,” MIT researchers  said in statement about the paper published in the journal Nature Chemistry.  “Exposing them to sunlight causes them to absorb energy and jump from  one configuration to the other, which is then stable for long periods of  time.”  To liberate that energy all you have to do is expose the molecules to  a small amount of light, heat or electricity and when they switch back  to the other shape the emit heat. “In effect, they behave as  rechargeable thermal batteries: taking in energy from the sun, storing  it indefinitely, and then releasing it on demand,” the scientists said.  The researchers used a photoswitching substance called an azobenzene,  attaching the molecules to substrates of carbon nanotubes. The  challenge: Packing the molecules closely enough together to achieve a  sufficient energy density to generate usable heat.     It appeared that the researchers had failed when they were only  able to pack fewer than half the number of molecules needed as  indicated by an earlier computer simulation of the experiment.  But instead of hitting a projected 30 percent increase in energy  density, they saw a 200 percent increase. It turned out that the key was  not so much packing azobenzene molecules tightly on individual carbon  nanotubes as packing the nanotubes close together. That’s because the  azobenzene molecules formed “teeth” on the carbon nanotubes, which  interlocked with teeth on adjacent nanotubes. The result was the mass  needed for a usable amount of energy storage.  That means different combinations of photoswitching molecules and  substrates might achieve the same or greater energy storage, according  to the researchers.  So how would molecular solar storage work if the technology can be  commercialized? Timothy Kucharski, the paper’s lead author and a postdoc  at MIT and Harvard, told The Atlantic that most likely the storage  would take a liquid form, which would be easy to transport.  “It would also enable charging by flowing the material from a storage  tank through a window or clear tube exposed to the sun and then to  another storage tank, where the material would remain until it's  needed,” Kucharski said in an email.  “That way one could stockpile the  charged material for use when the sun's not shining.”  The paper’s authors envision the technology could be used in  countries where most people rely on burning wood or dung for cooking,  which creates dangerous levels of indoor air pollution, leads to  deforestation and contributes to climate change.  “For solar cooking, one would leave the device out in the sun during  the day,” says Kucharski. “One design we have for such an application is  purely gravity driven – the material flows from one tank to another.  The flow rate is restricted so that it's exposed to the sun long enough  that it gets fully charged. Then, when it's time to cook dinner, after  the sun is down, the flow direction is reversed, again driven by  gravity, and the opposite side of the setup is used as the cooking  surface.”  “As the material flows back to the first tank, it passes by an  immobilized catalyst which triggers the energy-releasing process,  heating the cooking surface up,” he adds.  Other versions of such device could be used to heat buildings.  Kucharski said the MIT and Harvard team is now investigating other  photoswitching molecules and substrates, “with the aim of designing a  system that absorbs more of the sun's energy and also can be more  practically scaled up.”</blockquote>

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