Medical Design Briefs - April 2023 - 24

rials and technologies, " the research team wrote. " Previous
studies reported sufficient mechanical strength to withstand
industrial knitting. However, the demonstrated application
only included simple devices. "
The team set out to design its MXene textile supercapacitor
patch with the goal of maximizing energy storage capacity while
using a minimal amount of active material and taking up the
smallest amount of space - to reduce the overall cost of production
and preserve flexibility and wearability of the garment.
To create the supercapacitor, the team simply dipped small
swatches of woven cotton textile into a MXene solution then layered
on a lithium chloride electrolyte gel. Each supercapacitor
cell consists of two layers of MXene-coated textile with an electrolyte
separator also made of cotton textile. To make a patch with
enough power to run some useful devices - Arduino programmable
microcontrollers, in this case - the team stacked five cells
to create a power pack capable of charging to 6 V, the same
amount as the larger rectangular batteries often used to power
golf carts, electric lanterns, or for jump-starting vehicles.
" We came to the optimized configuration of a dip-coated, fivecell
stack with an area of 25 square centimeters to produce the
electrical loading necessary to power programmable devices, "
says Alex Inman, a doctoral researcher in the College of Engineering,
and co-author of the paper. " We also vacuum-sealed the
cells to prevent degradation in performance. This packaging approach
could be applicable to commercial products. "
The best-performing textile supercapacitor powered an Arduino
Pro Mini 3.3V microcontroller that was able to wirelessly
transmit temperature every 30 seconds for 96 minutes. And
it maintained this level of performance consistently for more
than 20 days.
" The initial report of a MXene textile supercapacitor powering
a practical peripheral electronics system demonstrates
the potential of this family of two-dimensional materials to
support a wide range of devices such as motion trackers and
biomedical monitors in a flexible textile form, " Gogotsi says.
The research team notes that this is one of the highest total
power outputs on record for a textile energy device, but it can
still improve. As they continue to develop the technology,
they will test different electrolytes and textile electrode configurations
to boost voltage, as well as designing it in a variety
of wearable forms.
" Power for existing e-textile devices still largely relies on traditional
form factors like lithium-polymer and coin cell Lithium
batteries, " the researchers wrote. " As such, most e-textile
systems do not use a flexible e-textile architecture that includes
flexible energy storage. The MXene supercapacitor
developed in this study fills the void, providing a textile-based
energy storage solution that can power flexible electronics. "
In addition to Gogotsi, Inman, Hryhorchuk, and Dion,
Lingyi Bi, Ruocun Wang, and Armin Vahid Mohammadi
from Drexel; and Ben Greenspan, Taylor Tabb, Eric M. Gallo,
and Andreea Danielescu from Accenture Labs, participated
in this research.
Contact: Yury Gogotsi, gogotsi@drexel.edu. For more information,
visit https://drexel.edu. A video of the technology is available
at https://www.youtube.com/watch?v=YbH83h3NdkM.
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24
With cancer, diabetes, and heart disease among the leading
causes of disability and death in the United States, imagine a
long-term, in-home monitoring solution that could detect
these chronic diseases early and lead to timely interventions.
Zheng Yan and a team of researchers at the University of Missouri
may have a solution. They have created an ultrasoft skin-like material
- that's both breathable and stretchable - for use in the
development of an on-skin, wearable bioelectronic device capable
of simultaneously tracking multiple vital signs such as blood pressure,
electrical heart activity and skin hydration.
" Our overall goal is to help improve the long-term biocompatibility
and the long-lasting accuracy of wearable bioelectronics
through the innovation of this fundamental porous material
which has many novel properties, " says Yan, an assistant professor
in the department of chemical and biomedical engineering and
the department of mechanical and aerospace engineering.
www.medicaldesignbriefs.com
Medical Design Briefs, April 2023
http://info.hotims.com/84478-744 https://drexel.edu https://www.youtube.com/watch?v=YbH83h3NdkM http://www.medicaldesignbriefs.com
Medical Design Briefs - April 2023

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