Silicone-Ionic Liquid Elastomer Composite with Keratin as Reinforcing Agent Utilized as Pressure Sensor.

Area of Science:

• Materials Science
• Electronics Engineering
• Biomedical Engineering

Background:

• Flexible pressure sensors are vital for advanced wearable devices, particularly for capturing dynamic human motion.
• Existing sensors often face limitations in sensitivity, response time, and durability.
• Developing novel materials is key to overcoming these challenges.

Purpose of the Study:

• To develop a novel flexible pressure sensor with enhanced force sensing capabilities.
• To investigate the synergistic effects of polydimethylsiloxane (PDMS), keratin, and ionic liquid (IL) on sensor performance.
• To optimize the ionic liquid content for superior pressure detection.

Main Methods:

• Fabrication of a flexible composite material using polydimethylsiloxane (PDMS) matrix.
• Incorporation of keratin as a reinforcing filler within the PDMS.
• Integration of a high-conductivity ionic liquid (IL) to enhance sensitivity.
• Systematic investigation of varying IL concentrations (e.g., 70 parts per hundred rubber) on sensor characteristics.
• Characterization of pressure-sensing performance, including sensitivity, response/recovery times, and pressure range.

Main Results:

• The developed elastomer with 70 parts per hundred rubber (phr) of IL exhibited excellent pressure-sensing performance.
• Achieved high linear sensitivity of 0.037 kPa^-1 within the 0-10 kPa pressure range.
• Demonstrated rapid response and recovery times of 8 ms and 11 ms, respectively.
• Successfully distinguished various pressures from 0 to 50 kPa with stable sensing signals.

Conclusions:

• The novel PDMS/keratin/IL composite pressure sensor offers significantly improved force sensing characteristics.
• The sensor's high sensitivity, fast response, and broad detection range make it suitable for demanding applications.
• Potential applications include advanced health monitoring systems and sophisticated soft robotics.