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Related Concept Videos

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Environmentally responsive hydrogel composites for dynamic body thermoregulation.

M Garzón Altamirano1,2, M G Abebe3, N Hergué1

  • 1Laboratory of Polymeric and Composite Materials (LPCM), Center of Innovation and Research in Materials and Polymers (CIRMAP), University of Mons (UMONS), Mons, Belgium. jeremy.odent@umons.ac.be.

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Summary

New hydrogel composites with silica nanoparticles dynamically modulate infrared radiation for personalized thermoregulation. These materials offer tunable IR reflection for advanced body heat management applications.

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Nanotechnology

Background:

  • Personalized thermoregulation is crucial for comfort and health.
  • Developing materials that can dynamically control heat exchange is an ongoing challenge.
  • Infrared (IR) radiation plays a significant role in body heat management.

Purpose of the Study:

  • To design and fabricate hydrogel composites capable of responsive modulation of infrared radiation.
  • To investigate the effect of silica nanoparticle content and environmental factors on IR reflection.
  • To demonstrate the potential of these composites for personalized body thermoregulation.

Main Methods:

  • Periodic arrangement of submicron-sized silica (SiO2) particles within poly(N-isopropylacrylamide) (PNIPAM)-based hydrogels.
  • Investigating the dependence of SiO2 content on IR reflection properties.
  • Utilizing Bragg's law to correlate particle spacing with IR reflection.
  • Employing thermography to map IR emission from the hydrogel composites on human skin.

Main Results:

  • Hydrogel composites with 20 wt% SiO2 reflected 20% of human body IR at 20°C and 0% RH.
  • Increased SiO2 content and decreased inter-particle distance enhanced IR reflection, consistent with Bragg's law.
  • Maximum IR reflection reached 42% under conditions of 35°C and 60% RH.
  • Thermography confirmed the IR reflection capabilities of the hydrogel composites when applied to skin.

Conclusions:

  • Hydrogel composites with embedded silica nanoparticles exhibit tunable thermo-hydro responsive IR modulation.
  • The developed materials show promise for advanced personalized thermoregulation systems.
  • The study provides a theoretical framework for understanding and optimizing IR reflection in such composites.