Soft Ionic Pressure Sensor with Aloe Vera Gel for Low-Pressure Applications

Area of Science:

• Materials Science
• Sensor Technology
• Biomedical Engineering

Background:

• Ionic pressure sensors rely on ionic compounds in solvents to detect pressure via electrical changes.
• Sensor performance varies significantly with material composition and geometry.
• A need exists for soft, adaptable sensors capable of measuring very low pressures.

Purpose of the Study:

• To design and fabricate a novel soft ionic pressure sensor for detecting pressures below 20 mm Hg.
• To investigate the impact of solvent concentration and geometric parameters on sensor performance.
• To establish optimal conditions for maximum sensor sensitivity.

Main Methods:

• Fabrication of soft ionic pressure sensors using Aloe vera gel and glycerin as the ionic sensing medium.
• Systematic variation of glycerin concentration and toroidal geometry (outer/inner diameters).
• Characterization experiments to evaluate sensor performance under varying pressures.

Main Results:

• The sensor demonstrated effective performance in the low-pressure range (<20 mm Hg).
• Maximum sensitivity of 7.498×10-4 Ω/mmHg was achieved with a 40% glycerin concentration.
• Optimal performance was linked to a toroidal geometry with 8 mm outer and 7 mm inner diameters.

Conclusions:

• A novel, entirely soft ionic pressure sensor was successfully developed using natural materials.
• The sensor exhibits high sensitivity for detecting very low pressures, suitable for specific applications.
• The design is adaptable to various geometries, offering flexibility for integration.