Inspiration from the natural world: Boosting flexible electronics
With increased study of bio-adhesives, a significant effort has been made in search for novel adhesives that will combine reversibility, repeated usage, stronger bonds and faster bonding time, non-toxic, and more importantly be effective in wet and other extreme conditions.
A team of Korean scientists?made up of scientists from Korea Institute of Science and Technology (KIST) and UNIST has recently found a way to make building flexible pressure sensors easier—by mimicking the suction cups on octopus’s tentacles.
In their paper published in the current edition of Advanced Materials, the research team describes how they studied the structure and adhesive mechanism of octopus suckers and then used what they learned to develop a new type of suction based adhesive material.
According to the research team, “Although flexible pressure sensors might give future prosthetics and robots a better sense of touch, building them requires a lot of laborious transferring of nano- and microribbons of inorganic semiconductor materials onto polymer sheets.”
In search of an easier way to process this transfer printing, Prof. Hyunhyub Ko (School of Energy and Chemical Engineering, UNIST) and his colleagues turned to the octopus suction cups for inspiration.
An octopus uses its tentacles to move to a new location and uses suction cups underneath each tentacle to grab onto something. Each suction cup contains a cavity whose pressure is controlled by surrounding muscles. These can be made thinner or thicker on demand, increasing or decreasing air pressure inside the cup, allowing for sucking and releasing as desired.
By mimicking muscle actuation to control cavity-pressure-induced adhesion of octopus suckers, Prof. Ko and his team engineered octopus-inspired smart adhesive pads. They used the rubbery material polydimethylsiloxane (PDMS) to create an array of microscale suckers, which included pores that are coated with a thermally responsive polymer to create sucker-like walls.
The team discovered that the best way to replicate organic nature of muscle contractions would be through applied heat. Indeed, at room temperature, the walls of each pit sit in an ‘open’ state, but when the mat is heated to 32°C, the walls contract, creating suction, therby allowing the entire mate to adhere to a material (mimicking the suction function of an octopus). The adhesive strength also spiked from .32 kilopascals to 94 kilopascals at high temperature.
The team reports that the mat worked as envisioned—they made some indium gallium arsenide transistors that sat on a flexible substrate and also used it to move some nanomaterials to a different type of flexible material.
Prof. Ko and his team expect that their smart adhesive pads can be used as the substrate for wearable health sensors, such as Band-Aids or sensors that stick to the skin at normal body temperatures but fall off when rinsed under cold water.
The Latest on: Flexible pressure sensors
via Google News
The Latest on: Flexible pressure sensors
- Samsung Galaxy Book Flex 2 5G review: A toy-box of features unlike any otheron May 13, 2021 at 2:00 am
The second-gen Flex has stacks of features - more than really any other laptop you're likely to see - but how useful are they really and truly?
- No-Battery Pressure Sensors For Bike Tyreson May 10, 2021 at 5:00 pm
The device consists of an ultra low power microcontroller from Texas Instruments, paired with a pressure sensor. Set up for ... to wear out over time due to flex damaging the delicate copper ...
- Untethering Motherson May 10, 2021 at 1:47 pm
“Measuring continuous blood pressure is a new metric we can capture,” Xu said ... The study, “Comprehensive Pregnancy Monitoring with a Network of Wireless, Soft and Flexible Sensors in High- and ...
- Soft sensors are first to comprehensively monitor pregnant women without wireson May 9, 2021 at 5:00 pm
flexible and comfortable wireless sensors. The new wearable devices measure the mother's and baby's vital signs as well as provide new data, including information about the mother's physical ...
- Can Ultra-Sensitive Strain Sensors Be Made to Serve Advanced Robotics?on May 7, 2021 at 12:46 pm
E-skin, robotic arms, and surgical robots can benefit from a new process that can customize strain sensors with more precision and accuracy.
- How Wearable Sensors are Revolutionizing Non-Invasive Health Monitoringon May 6, 2021 at 7:04 am
An extensive amount of work has been done on advancing the sensing capabilities of stretchable sensors for a wide range of non-invasive health monitoring devices.
- EVs driving printed electronics to billion dollar industry – reporton May 6, 2021 at 6:00 am
Market researcher IDTechEx has released a new report looking at how the shift to electric vehicles and autonomy may push the printed electronics automotive market to reach $12.7 billion by 2031.
- Advances in 3D-printing technology for sensorson May 5, 2021 at 10:38 am
D-printing technology has been increasingly applied to the production of advanced engineering components for sensors. Advances in the technology, which uses melting and solidification processes to ...
- Measuring healthon May 5, 2021 at 12:51 am
Today, we’re on the verge of a third generation of health sensing technology. The first was aimed at tracking fitness, making simple measurements of inputs (such as how many steps the user took in a ...
- New Report from IDTechEx Reveals Shift to Electric Vehicles and Autonomy to Drive Printed Electronics Automotive Market to $12.7 bn by 2031on May 4, 2021 at 7:28 am
which is set to continue and extend to curved and flexible displays. Human machine interface (HMI) technologies, more simply described as pressure or touch sensors, are especially promising.
via Bing News