Bloody hand. Effective trick and its solution

EFFECTIVE FOCUSES AND THEIR CLUES
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Bloody hand. Focus secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

Focus Description:

Take a knife and run it over your hand - a wound will appear on your hand. After repeated striping, numerous bloody marks will remain on the arm. Now wipe the "bloody" hand with a handkerchief, and all the "wounds" will disappear without a trace.

Focus secret:

The knife was lubricated with a solution of ferric chloride, and the hand was previously coated with colorless potassium thiocyanate. It is enough to hold such a prepared knife on such a prepared hand so that a "bloody" mark appears on it. The handkerchief was moistened with water with a colorless admixture of sodium fluoride, so after wiping his hands from the "bloody" wounds, nothing remained.

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Nanosheets instead of platinum 28.05.2012

Platinum catalysts open up great prospects for alternative energy, for example, in the case of the production of hydrogen from water. However, the high price of platinum makes it difficult to implement the latest technologies on a large scale. Perhaps scientists from the Brookhaven National Laboratory of the US Department of Energy managed to solve this problem.

Scientists have developed a new type of inexpensive electrocatalyst that can efficiently extract hydrogen from water. The catalyst is based on a nickel-molybdenum-nitrogen compound in the form of crumpled sheets of nanometer scale.

Water is an ideal source of pure hydrogen: there is plenty of it on the planet and it does not contain harmful by-product greenhouse gases. The electrolysis of water into oxygen and hydrogen requires an external power source and an efficient catalyst. In this case, the hydrogen yield should be greater than the energy consumption for electrolysis.

In search of an effective catalyst, scientists heated a nickel-molybdenum compound to high temperatures in the presence of nitrogen and suddenly saw that the substance turned into nanosheets. Despite the fact that metal nitrides are widely used, this is the first example of the formation of nanosheets. Nitrogen expanded the lattices of the nickel-molybdenum compound and increased the electron density. Thus, a relatively inexpensive substance in its electronic structure approached noble metals. If these sheets are crumpled, then a catalyst with a large reactive surface area can be obtained.

The new catalyst works almost as well as platinum. In its electrocatalytic activity, it has no equal among other non-precious metal compounds. Moreover, the process of creating nanosheets is simple, scalable and suitable for a wide range of industrial applications.

Although the new catalyst is not the final and ideal solution to the problem of ultra-cheap hydrogen production, nevertheless, it can significantly reduce the cost of hydrogen fuel and equipment for its production.

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