Multiresponsive Self-Healing Lanthanide Fluorescent Hydrogel for Smart Textiles.

Area of Science:

• Organometallic Chemistry
• Materials Science
• Polymer Science

Background:

• Lanthanide organometallic complexes display strong luminescence via antenna effects due to f-d energy level transitions.
• Ligand coordination to lanthanide metals is key to this luminescent phenomenon.

Purpose of the Study:

• To develop a self-healing, environmentally responsive smart material using europium (Eu) and terbium (Tb) lanthanide complexes.
• To integrate this material into a high-performance hydrogel composite for potential smart textile applications.

Main Methods:

• Synthesized organometallic complexes using Eu and Tb with iminodiacetic acid ligands.
• Fabricated a hydrogel composite incorporating temperature-sensitive poly(N-isopropylacrylamide), poly(vinyl alcohol), and poly(acrylic acid).
• Investigated the material's self-healing, dynamic coordination, and environmental responsiveness (wavelength, temperature, pH).

Main Results:

• The developed material exhibited self-healing properties due to dynamic ligand-metal bonds acting as chelating and cross-linking agents.
• The hydrogel composite demonstrated tunable luminescence and color changes in response to excitation wavelength, temperature, and pH, attributed to differing Eu3+ and Tb3+ coordination stabilities.
• Incorporation into fabrics showed temperature-dependent pore size adjustment and improved air permeability above 32 °C.

Conclusions:

• The novel lanthanide-based hydrogel composite functions as a smart material with self-healing and responsive characteristics.
• The material's ability to change color and modify fabric properties makes it highly promising for advanced smart textile applications.