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Um Novo Material que pode ser feito no Micro-ondas!
New heat-harvesting material made in $40 microwave oven
By Ben Coxworth
Virtually all electrical devices and industrial processes create heat as they operate, which is typically wasted. In the past several years, various thermoelectric technologies have been developed to address that situation, by converting such heat into electricity. The ideal material for the purpose would be one that has a high electrical conductivity, but a low thermal conductivity - that way, it could carry plenty of electricity without losing efficiency through overheating. Unfortunately, electrical and thermal conductivity usually seem to go hand in hand. With some help from an ordinary microwave oven, however, researchers from New York's Rensselaer Polytechnic Institute have created a nanomaterial that appears to fit the bill.
The team started with zinc oxide, which is already pretty well-suited to heat harvesting, as it is nontoxic, cheap, can have its electrical conductivity boosted, and has a high melting point. It is also, however, fairly thermally conductive.
In collaboration with the University of Wollongong, Australia, the researchers proceeded to add tiny amounts of aluminum to samples of zinc oxide, then processed the two materials together in a microwave oven. The resulting aluminum-doped zinc oxide nanocomposite retained the original zinc's electrical conductivity, but had a much lower thermal conductivity.
E mais um argumento prós Professores de Matemática, a dita cuja até serve para ajudar a criar NOVOS PLÁSTICOS!
Mathematical model could streamline the development of new plastics
By Ben Coxworth
When it comes to the development of new plastics, two things have generally happened - a plastic is created and then a use is found for it, or a long trial-and-error process is undertaken in order to create a plastic with specific qualities. In a move that has been described as "comparable to cracking a plastics DNA," however, scientists at the University of Leeds and Durham University have created a mathematical model that should allow specialty plastics to be created much more quickly and efficiently.
The model incorporates two pieces of computer code. One of those is designed to predict how different polymers will flow, based on the the connections between their string-like molecules. The other predicts the shapes that those molecules will take on, when created at a chemical level. The model is based on data from experiments, in which the melting, flowing and forming processes of lab-created "perfect polymers" were analyzed.
E mais uma trazida a vós pela Ponoko, uma maneira de colorir o Plástico das Makerbots!
Coloring 3D printer filament with a SharpieMaking colorful 3D prints with white ABS plastic.
Thingiverse user cyclone designed this handy device to add color to 3D prints using a couple Sharpies. If you have a large quantity of white ABS and you’re bored of the color, this would be a great way to add some variety without buying new plastic.Cyclone is not the first person to do something like this, he says he used thing #5570 as a starting point; but this looks like the most well-refined design so far.