Entries with tag stretchable electronics.

Researchers Design Stretchable Antenna for Wearable Devices

North Carolina State University scientists have created a stretchable antenna for use with wearable technologies. They say the antenna can be deformed and return to its original shape as the wearer moves. The researchers have been working on wearable sensors for health monitoring, but said there was “a clear need” for antennas to be developed in order for the data collected to be transmitted for proper monitoring or diagnosis by healthcare professionals. They created the antenna using silver nanowires and liquid polymer. Once the polymer material is set, the result is an elastic material that serves as a microstrip patch antenna’s radiating element, the portion of the antenna that radiates or receives radio-frequency energy. This printed antenna is bonded to another stretchy polymer ground layer containing an embedded, continuous layer of silver nanowires to complete the antenna. The researchers published their work online in ACS Applied Materials & Interfaces. (PhysOrg)(ACS Applied Materials & Interfaces) 

Stretchable Lithium-Ion Battery Demonstrated

US researchers have demonstrated a flexible, stretchable lithium-ion battery that can be recharged wirelessly, enabling its use in numerous applications needing flexible electronic components. Developed by Yonggang Huang, professor of civil and environmental engineering and mechanical engineering from Northwestern University and John A. Rogers, professor of materials science and engineering as well as chemistry at University of Illinois, the battery could power stretchable electronic devices such as implantable medical devices. They have demonstrated the battery powering an LED and continuing to work even when contorted in different ways. It is reportedly capable of stretching by up to 300 percent of its original size while continuing to function. The battery’s life is between eight and nine hours. The researchers plan to publish their work in Nature Communications.  (PhysOrg)(Northwestern University @ EurekAlert)

Researchers Create Elastic Nanowires for Stretchable Electronics

North Carolina State University researchers have developed highly conductive and elastic conductors that could enable the creation of stretchable electronic devices. The researchers made the material by placing silver nanowires on a silicon plate. Then, they poured a liquid polymer over the substrate. When exposed to high temperatures, the polymer becomes an elastic solid in which the nanowires are embedded. They them removed the polymer material from the silicon. The researchers claim the material can be stretched up to 50 percent without affecting conductivity. They published their work in Advanced Materials. (PhysOrg)(North Carolina State University)(Advanced Materials)

Researchers Develop Stretchy Electronic Material

An international research team has developed a material that can be used to create electronics capable of stretching to more than double their original size. Scientists from Northwestern University’s McCormick School of Engineering, the Korea Advanced Institute of Science and Technology, Dalian University of Technology in China, and the University of Illinois at Urbana-Champaign created the new material by combining a porous polymer (porous polydimethylsiloxane) and a liquid metal (eutectic gallium-indium). This combination lets electricity flow consistently through the device, even when it is being stretched. Loss of conductivity is a common problem with existing stretchable electronics. The researchers said the new material is four times stretchier than conventional elastic electronics materials. They noted that healthcare and other applications could use stretchy devices. They published their research in Nature Communications. (EurekAlert)(Northwestern University)(Nature Communications)

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