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
- No-Battery Pressure Sensors For Bike Tyreson July 26, 2022 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 ...
- Flexible Electronics Market Consumption, Revenue, Future Scope and Growth Rate 2027on July 25, 2022 at 12:05 am
and pressure sensors in bridges and machinery. The report explores the Flexible Electronics market’s segments (Application, End-User, and Region). Data has been provided by market participants ...
- Flex PCBs Make Force-Mapping Pressure Sensor For Amputeeon July 22, 2022 at 5:00 pm
But no matter what advanced sensors and actuators are ... Measuring and mapping the pressure on the residual limb is the business of this flexible force-sensing matrix. The idea for a two ...
- How to Build a Better Sensor Characterization Systemon July 21, 2022 at 5:00 pm
A common example is found in the integration of embedded force and pressure sensors ... then one should consider using flexible thin-film touch sensors. Related: Sensors Bring Silicon Closer to System ...
- Flexpoint Continues To Provide Customized Sensorson July 19, 2022 at 5:42 am
and other safety-critical pressure-relief products. The Bend Sensor Technology works extremely well in harsh types of environments and applications. Because of the Bend Sensor's fast reaction ...
- Flexpoint Continues to provide Customized Sensorson July 19, 2022 at 5:00 am
High Pressure Relief Protection Sensors provided to a Global Manufacturer West Jordan, Utah--( - July 19, 2022) - Flexpoint Sensor Systems, Inc. (OTC Pink: FLXT) announces the integration of its ...
- Piezoresistive design for electronic skin: From fundamental to emerging applicationson July 11, 2022 at 7:01 am
pressure, strain, bending, vibration and slippage. In this paradigm, the flexible tactile sensor designed based on piezoresistive effect has advantages such as low energy consumption, low cost ...
- Electronic Skin Lets Humans Feel What Robots Do—And Vice Versaon July 5, 2022 at 7:34 am
The first so-called flexible sensor arrays were built ... The researchers also incorporated previously developed pressure and temperature sensors. The resulting e-skin looks like a transparent ...
- Biomedical Fiber Optic Sensors Applications & Markets Report 2022 - ResearchAndMarkets.comon June 10, 2022 at 1:44 am
This report reviews the advantages of using optical fibers and fiber sensors and discusses what makes them such an attractive, flexible ... to intra-aortic pressure probes. Optical fibers have ...
via Bing News