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Framework-Densified Isotropic Cellulose Ionogel for Omnidirectional Flexible Sensing
Jiawei Yang1, Zhiyang Yu1, Zhixuan Yang1
1College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou350002, China.
Biomacromolecules
|June 2, 2026
Summary
Researchers developed a robust, isotropic cellulose ionogel for flexible omnidirectional sensors. This material overcomes limitations in soft ionic materials, offering high mechanical strength and stable, direction-insensitive pressure sensing for advanced monitoring applications.
Area of Science:
- Materials Science
- Polymer Chemistry
- Sensor Technology
Background:
- Flexible omnidirectional sensors are crucial for monitoring multidirectional mechanical stimuli.
- Existing soft ionic materials face limitations in mechanical robustness, homogeneity, isotropy, and ionic transport.
- Gel-reinforcement strategies often involve trade-offs compromising material properties.
Purpose of the Study:
- To develop a high-strength, isotropic cellulose ionogel for robust flexible sensing.
- To overcome the limitations of existing soft ionic materials.
- To enable direction-insensitive electrical response in flexible sensors.
Main Methods:
- Densification-engineering strategy based on molecular framework reconstruction.
- Ionic liquid-assisted thermoactivation and compression-induced hydrogen-bond reconfiguration.
- Regenerated cellulose framework transformation into a dense fibrillar skeleton via crystal reconstruction and isotropic densification.
Main Results:
- Achieved a high-strength isotropic cellulose ionogel with tensile strength of 45.4 MPa and toughness of 10.2 MJ/m³ (76- and 166-fold increase).
- Developed an omnidirectional sensor with direction-independent pressure sensing (50-400 kPa) and stable ionic conduction.
- Demonstrated reliable sensor operation over 1500 cycles and early warning monitoring capabilities.
Conclusions:
- The densification-engineering strategy successfully created a mechanically efficient and isotropic ionogel.
- The developed cellulose ionogel offers a robust platform for omnidirectional flexible sensing.
- This provides a general route to advanced soft ionic materials for complex mechanical monitoring.
