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Category Archives: Curiosities
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Magically Magnetic Gadolinium : Nature Chemistry : Nature Publishing Group
Gadolinium is one of the most important materials used by us during attempts to construct an effective magnetocaloric cooling unit. Please read the basic facts about it.
Both gadolinium and some of its alloys or salts play a prominent role in magnetic cooling. In this refrigeration process, a magnetic substance becomes hotter when placed under certain external magnetic field, owing to the orientation of its magnetic dipoles. Inversely when the field is removed, and the substance thermally isolated, it cools down. By varying the magnetic field, and the sample’s insulation, one shuffles entropy between the material’s electronic spin system and other degrees of freedom.
Source: Magically magnetic gadolinium : Nature Chemistry : Nature Publishing Group
[bibtex file=”http://kmim.wm.pwr.edu.pl/wp-content/uploads/2015/07/gadolin.bib”]
New amazing metal is so hydrophobic it makes water bounce like magic
Scientists at the University of Rochester have created a metal that is so extremely hydrophobic that the water bounces on it as if it were repelled by a magic force field. Instead of using chemical coatings they used lasers to etch a nanostructure on the metal itself. It will not wear off, like current less effective methods.
fromNew amazing metal is so hydrophobic it makes water bounce like magic.
Fuel Cell Vehicles Aren’t Yet Greener than Hybrids | MIT Technology Review
If you want to help cut greenhouse gas emissions, you should probably skip the hydrogen fuel cell cars now coming to market and buy a much cheaper hybrid instead.
After decades of research and small-scale demonstrations, hydrogen cars are finally rolling into view. These vehicles use electric motors, but their electricity comes not from a battery but from hydrogen, processed in a chemical reaction that takes place inside a fuel cell.
za Fuel Cell Vehicles Aren’t Yet Greener than Hybrids | MIT Technology Review.