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Current issue

ELEKTRO 1/2017 was released on January 18th 2017. Its digital version will be available on February 17th 2017.

 

Topic: Electrotechnology; Materials for electrical engineering; Equipment and accessories; Marking

 

Main Article

Data analysis of photovoltaic system during an eclipse

Risk of wiring of biometric identification systems

SVĚTLO (Light) 6/2016 was released on December 5th 2016. Its digital version will be available on January 5th 2017.

Interiors lighting
Colloquium Interiors 2016 – the fifth anniversary
Cooperation of indoor interior and lighting 

Standards, regulations and recommendations
New standards for road lighting

Thermoelectric silicon material reaches record-low thermal conductivity

05.10.2016 | Phys.org | www.phys.org

Researchers have theoretically demonstrated the lowest rate of heat transfer, or thermal conductivity, in any silicon-based material developed so far.

The new material, which is a polycrystalline silicon nanowire, breaks two limits: the Casimir limit and the amorphous limit. The Casimir limit is a theory that describes the thermal conductivity of nanostructures, and breaking it means that the thermal conductivity of the new material is lower than the value predicted by Casimir limit theory.

New thermoelectric material

The amorphous limit is regarded as the lowest thermal conductivity of a material, since amorphous structures strongly scatter heat carriers. However, due to its unique nanoscale design, the polycrystalline silicon nanowire has a thermal conductivity that is three times lower than that of amorphous silicon materials.

The researchers expect that the new material could be especially useful for thermoelectric applications. By converting heat energy into electricity, thermoelectric materials provide a way to capture some of the waste heat emitted by vehicle tailpipes, power plants, and manufacturing facilities, and then convert the heat into useful energy.

Read more at Phys.org

Image Credit: Adobe Stock

-jk-