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Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
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A pH-Sensitive Stretchable Zwitterionic Hydrogel with Bipolar Thermoelectricity.

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Researchers developed a stretchable hydrogel for wearable thermoelectric devices. This pH-tunable material efficiently harvests body heat, enabling new possibilities for low-grade waste heat recovery in electronics.

Keywords:
hydrogelionic Seebeck coefficientionic thermoelectricslow‐grade heat harvestingzwitterionic polymer

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Area of Science:

  • Materials Science
  • Energy Harvesting
  • Wearable Technology

Background:

  • Wearable electronics require flexible and stretchable power sources.
  • Harvesting body heat (low-grade waste heat) is a promising avenue for self-powered devices.
  • Developing materials with efficient thermoelectric properties that are also mechanically robust and stretchable remains a challenge.

Purpose of the Study:

  • To engineer a novel double-network hydrogel with enhanced mechanical properties for stretchable thermoelectric applications.
  • To investigate the pH-dependent thermoelectric properties of the zwitterionic (ZI) hydrogel.
  • To demonstrate a prototype stretchable ionic thermoelectric supercapacitor for waste heat harvesting.

Main Methods:

  • Synthesized a double-network hydrogel using 2-acrylamido-2-methylpropanesulfonic acid and zwitterionic sulfobetaine acrylamide.
  • Characterized the mechanical properties (tensile stress and strain) of the hydrogel.
  • Measured the ionic Seebeck coefficient (Si) and figure of merit (ZTi) across a pH range of 1 to 14.
  • Fabricated and tested a prototype stretchable ionic thermoelectric supercapacitor.

Main Results:

  • The double-network hydrogel exhibited excellent mechanical properties with tensile stress up to 470.3 kPa and strain of 106.6%.
  • The ZI hydrogel demonstrated tunable polar thermoelectric properties, with ionic Seebeck coefficients ranging from -32.6 to 31.7 mV K-1 as pH varied from 1 to 14.
  • High figure of merit (ZTi) values of 3.8 and 3.6 were achieved at pH 1 and 14, respectively.
  • The prototype supercapacitor achieved power densities of 1.8 mW m-2 (pH 1) and 0.9 mW m-2 (pH 14).

Conclusions:

  • The developed pH-sensitive, stretchable ZI hydrogel offers a promising platform for thermoelectric energy harvesting.
  • This material is suitable for applications requiring flexible and wearable power generation, particularly for harvesting low-grade waste heat (25-40 °C).
  • The study paves the way for advanced wearable devices powered by body heat.