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artificial wood

23.05.2020

A new material developed by the University of Science and Technology of China, which is light in weight, as strong as wood, but does not have the standard weak characteristics of wood, does not burn or absorb water.

To create synthetic wood, we took a solution of polymer resin and added a little (a pinch) of chitosan powder, a basic cationic polysaccharide polymer obtained from crab and shrimp shells. They sublimated the solution, resulting in a structure filled with tiny pores and channels, backed by chitosan. They then heated the resin to a temperature of 200 degrees Celsius (to vulcanize the latter), thus creating strong chemical bonds.

Unlike real trees, the new material does not take years to grow. In addition, the new material practically does not absorb water; specimens immersed in water and a strong acid bath remained there for 30 days with little or no loss of quality, while specimens of Balsa wood tested under the same conditions lost two-thirds of their strength and 40 percent of their resistance to turmoil. The new material was practically incombustible and stopped burning as soon as it was removed from the flame.

Imitation wood could be used in the production of reliable resistant containers. And the porosity property of the new synthetic material seems to be important, since it acts as an air trap, which could make such a substance an excellent insulating material suitable for building construction.

Environmentally friendly alternatives to polymer resins could also increase interest in the new material.

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LED operation 07.09.2003

The Italian company "Rimsa" starts production of shadowless LED lamps for operating rooms.

Instead of conventional halogen lamps, five bright white LEDs are used, which create an illumination of 50 lux on the operating field a meter away from the lamp (an ordinary 100-watt light bulb gives 25 lux at a distance of a meter, however, mirrors and lenses can increase this value tenfold). Energy consumption compared to incandescent lamps is three times less, the service life is 50 times longer and reaches XNUMX thousand hours.

The LEDs emit no UV or IR light and generate little to no heat, so surgeons do not suffer from heat and the operating field does not dry out.

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