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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at the...

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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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Antifreezing and Temperature-Responsive Ionic Hydrogels with Applications in Encryption and Sensor Technologies.

Xia Qiu1,2, Xiaolong He3, Kubra Kalayci1,2

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|July 14, 2025
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Summary

A novel biobased hydrogel using dextrin and an ionic liquid monomer offers rapid, flexible thermoresponsive sensing. This smart material maintains performance from -20°C to 60°C, ideal for wearable devices and anticounterfeiting.

Keywords:
antifreezingbiobased hydrogelencryptionthermoresponsivenesswearable sensor

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sensor Technology

Background:

  • Thermoresponsive hydrogels are increasingly used in smart devices but face limitations in response speed and low-temperature flexibility.
  • Existing biobased hydrogel sensors struggle with rapid ambient temperature detection and maintaining flexibility at subzero temperatures.

Purpose of the Study:

  • To develop a novel thermoresponsive hydrogel sensor with enhanced responsiveness and flexibility at low temperatures.
  • To explore the potential of a dextrin-glycerol-ionic liquid hydrogel as a smart sensor material.

Main Methods:

  • A novel hydrogel was synthesized using dextrin, glycerol, and tetrabutylphosphonium styrenesulfonate (PSS), an ionic liquid monomer.
  • The hydrogel's structure incorporated glycidyl methacrylate dextrin (Dex-GMA) and multihydrogen bonds for antifreeze properties.
  • Thermoresponsive behavior and performance across a wide temperature range were evaluated.

Main Results:

  • The developed hydrogel exhibits a lower critical solution temperature (LCST)-type thermoresponsive phase transition due to PSS.
  • The material demonstrates a broad operating temperature range from 20°C to 60°C.
  • The Dex-GMA-PSS hydrogel maintained flexibility and functionality at temperatures as low as -20°C.

Conclusions:

  • The novel dextrin-based hydrogel offers a promising solution for thermoresponsive sensing applications requiring rapid response and low-temperature flexibility.
  • This material shows potential for flexible wearable devices, skin-like sensors, and anticounterfeiting technologies.
  • The hydrogel's unique properties across a wide temperature range open new avenues for advanced material applications.