Malleable 'electronic skin' is self-healable and recyclable

12th February 2018
Posted By : Enaie Azambuja
Malleable 'electronic skin' is self-healable and recyclable

 

CU Boulder researchers have developed a type of malleable, self-healing and fully recyclable 'electronic skin' that has applications ranging from robotics and prosthetic development to better biomedical devices. Electronic skin, known as e-skin, is a thin, translucent material that can mimic the function and mechanical properties of human skin.

A number of different types and sizes of wearable e-skins are now being developed in labs around the world as researchers recognise their value in diverse medical, scientific and engineering fields.

The new CU Boulder e-skin has sensors embedded to measure pressure, temperature, humidity and air flow, said Jianliang Xiao, an assistant professor in CU Boulder's Department of Mechanical Engineering who is leading the research effort with Wei Zhang, an associate professor in CU Boulder's Department of Chemistry and Biochemistry as well as a faculty member in the Materials Science and Engineering Program.

The technology has several distinctive properties, including a novel type of covalently bonded dynamic network polymer, known as polyimine that has been laced with silver nanoparticles to provide better mechanical strength, chemical stability and electrical conductivity.

“What is unique here is that the chemical bonding of polyimine we use allows the e-skin to be both self-healing and fully recyclable at room temperature,” said Xiao. “Given the millions of tons of electronic waste generated worldwide every year, the recyclability of our e-skin makes good economic and environmental sense.”

A paper on the subject was published in the journal Science Advances. Co-authors on the study include Zhanan Zou and Yan Li of mechanical engineering and Chengpu Zhu and Xingfeng Lei of chemistry and biochemistry. The study was funded in part by the National Science Foundation.

Many people are familiar with the movie The Terminator, in which the skin of film’s main villain is “re-healed” just seconds after being shot, beaten or run over, said Zhang. While the new process is not nearly as dramatic, the healing of cut or broken e-skin, including the sensors, is done by using a mix of three commercially available compounds in ethanol, he said.

Another benefit of the new CU Boulder e-skin is that it can be easily conformed to curved surfaces like human arms and robotic hands by applying moderate heat and pressure to it without introducing excessive stresses.

“Let’s say you wanted a robot to take care of a baby,” said Zhang. “In that case you would integrate e-skin on the robot fingers that can feel the pressure of the baby. The idea is to try and mimic biological skin with e-skin that has desired functions.”

To recycle the skin, the device is soaked into recycling solution, making the polymers degrade into oligomers (polymers with polymerisation degree usually below 10) and monomers (small molecules that can be joined together into polymers) that are soluble in ethanol. The silver nanoparticles sink to the bottom of the solution.

“The recycled solution and nanoparticles can then be used to make new, functional e-skin,” said Xiao.


Discover more here.

Image credit: University of Colorado Boulder.

 


You must be logged in to comment

Write a comment

No comments




Sign up to view our publications

Sign up

Sign up to view our downloads

Sign up

SINDEX 2018
28th August 2018
Switzerland BERNEXPO-Site, Bern
European Microwave Week 2018
23rd September 2018
Spain Ifema Feria De Madrid
Connected World Summit 2018
25th September 2018
United Kingdom Printworks, London
IoT Solutions World Congress 2018
16th October 2018
Spain Barcelona
Engineering Design Show 2018
17th October 2018
United Kingdom Ricoh Arena, Coventry