Self-healable soft shield for γ-ray radiation based on polyacrylamide hydrogel composites

Area of Science:

• Materials Science
• Radiation Physics
• Polymer Chemistry

Background:

• Growing concerns regarding radiation exposure necessitate advanced shielding solutions.
• Conventional heavy metal radiation shields lack flexibility and are prone to mechanical damage.
• The development of soft, self-repairing radiation shields is crucial for enhanced human body protection.

Purpose of the Study:

• To fabricate an intrinsically self-healable soft shield for gamma radiation.
• To incorporate lead dioxide nanoparticles for gamma ray shielding and Laponite clays for self-repairing properties.
• To evaluate the mechanical, shielding, and self-healing performance of the developed hydrogel composite.

Main Methods:

• Fabrication of an acrylamide-based hydrogel composite incorporating lead dioxide nanoparticles and Laponite clays.
• Mechanical testing to assess stretchability and tensile properties.
• Gamma ray attenuation measurements using a cobalt-60 source.
• Systematic analysis of self-healing efficiency and storage modulus.
• Investigation of gamma ray effects on polymer chain structure and self-healing properties.

Main Results:

• The hydrogel composite demonstrated exceptional stretchability exceeding 1400%.
• A high gamma ray attenuation coefficient of 0.1343 cm⁻¹ was achieved.
• A maximum self-healing efficiency of 96.55% was obtained.
• Gamma radiation was found to decrease self-healing efficiency due to chain scissioning or crosslinking.

Conclusions:

• The developed hydrogel composite represents a promising soft, self-healing material for gamma radiation shielding.
• The material exhibits a unique combination of high flexibility, effective shielding, and autonomous repair capabilities.
• Understanding the impact of gamma radiation on the material's self-healing mechanism is vital for optimizing its long-term performance.