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Current issue

ELEKTRO 7/2020 was released on June 24th 2020. Its digital version will be available on July 24th 2020.

Topic: Cables, conductors and cable engineering

Main Article
New traction power supply technology 25 kV/50 Hz (part 2)

SVĚTLO (Light) 3/2020 was released on June 8th 2020. Its digital version will be available on July 8th 2020.

Professional organizations activities
Announcement: LUMEN V4 2020 is cancelled
What is new in CIE, April 2020

Accessories of lighting installations
Foxtrot as a “Master Control” in Hotel Breukelen
Lighting regulators – control of lighting on the constant level

Temperature sensor for artificial skin

30. 1. 2017 | ETH Zurich | www.ethz.ch

The capacity to detect temperature changes is an important function of the human skin. Researchers at ETH Zurich have now developed a highly sensitive and, at the same time, flexible temperature sensor, which could soon be used in prosthetic limbs and robotic arms.

Serendipity played an important role in the discovery of this temperature sensor. In his research, Raffaele Di Giacomo, who led the project in the laboratory of ETH-professor Daraio, had initially stumbled upon a peculiarity of the vegetable material pectin. Pectin is better known around the household as a gelling agent for puddings and marmalades, but Di Giacomo was interested in a different property of this substance, which is composed of many interconnected sugar molecules.

Temperature sensor for artificial skin

Experiments on tree branches, whose cell walls contain pectin, had shown that their electrical conductivity depended strongly on temperature. To investigate the mechanism behind that dependence, the researchers in Zurich created an artificial “cyberwood” made from pectin and carbon nanotubes.

By measuring the electrical resistance at different temperatures they eventually found that calcium ions trapped at the contact points between two sugar molecules were responsible for the sensing mechanism. The higher the temperature, the more free calcium ions were present in the artificial wood, and hence the better it conducted electrical current.

Read more at ETH Zurich

Image Credit: ETH Zurich / Raffaele di Giacomo

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