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Ionic conductive cellulose hydrogels have been prepared by wuhan university and can work at sub-zero temperatures

Time : 2019-12-24 Hits : 11

As a three-dimensional material rich in water, hydrogel has the characteristics of high elasticity, transparency and biocompatibility. It has been widely used in contact lenses, cosmetics, tissue engineering, wound dressings and other fields. In recent years, conductive hydrogels have been widely used in the field of sensors and flexible electronic devices. However, conventional hydrogels lose their original properties due to freezing at low temperatures, limiting their application at low temperatures.


Wang Yang, lv ang and zhang lina, associate professors of wuhan university, have successfully prepared an antifreeze ionic conductive cellulose hydrogel, which can be used as tension, compression and temperature sensor. Unlike traditional hydrogels, their antifreeze properties allow them to work well at sub-zero temperatures. The findings are published in the journal ACS Applied Materials & Interfaces.


The key to the antifreeze and electrical conductivity of cellulose hydrogels lies in benzyl trimethyl ammonium hydroxide, an aqueous solution of organic base that is one of the new cellulosic solvent systems developed by the team, the study said. After chemical crosslinking of cellulose solution, the organic base as solvent is not washed away as in the traditional preparation process, but is retained directly. Its properties as electrolyte give the cellulose hydrogel the antifreeze and conductive properties as a whole.

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The performance of traditional cellulose hydrogels and antifreeze cellulose hydrogels at low temperature


Researchers in - 24 ℃ low temperature will freeze resistance conductive hydrogel fixed in finger joints, whether by the same margin finger flexion and fast or slow at different range stretch, the resistance of the conductive water gel relative value can change with the finger movements shows the amplitude of the corresponding change, and almost undetectable noise or hysteresis, hydrogel and no permanent deformation due to stretching, shows that the conductive water gel has the stable mechanical properties in low temperature tensile - resistance and sensitive response performance.

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Antifreeze hydrogels are used as a stretch sensor to simulate finger bending at low temperature


Not only that, the researchers will also dielectric elastomers in conductive hydrogels can be made between the "double response" sensor, has the capacity and pressure sensitive resistance - win min and double sensor performance, further experiments proved that the two response does not interfere with each other, showed that the sensor based on antifreeze conductive hydrogel has stable mechanical and thermal sensitivity, have fast and reliable, stable and reversible response performance and is suitable for the characteristics of low temperature using temperature can be used in the complex environment of soft artificial intelligence devices.

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Mechanical and thermal sensitivity test of antifreeze conductive hydrogel sensor


Thesis topic: Transparent, Antifreezing, Ionic Conductive Cellulose Hydrogel with Stable Sensitivity at Subzero Temperature 

The thesis links: http://pubs.acs.org/doi/abs/10.1021/acsami.9b15849

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