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<p>Photothermally responsive hydrogels with robust mechanical properties are highly desirable for biomedical engineering and wearable applications. Here, a simple and scalable strategy is proposed to fabricate multifunctional polyvinyl alcohol (PVA)-based hydrogels by integrating polydopamine (PDA) and citrate-stabilized silver nanoparticles (Ag NPs). PDA provides broadband light absorption and adhesion, while Ag NPs contribute localized surface plasmon resonance (LSPR) effects and improved conductivity. Successive freeze-thaw cycles promote network densification and microcrystalline formation, further reinforcing the hydrogel matrix. Compared to PVA@PDA hydrogels, the optimized PVA@PDA@Ag hydrogel exhibited superior photothermal conversion and mechanical performance, with maximum load, tensile strength, and yield stress increasing by 2.3-fold, 2.5-fold, and 2-fold, respectively. These enhancements result from the synergistic physical crosslinking effect of PDA and Ag NPs on PVA chains, improved charge and thermal transport, and network crystallization. This work offers a versatile platform for the design of high-performance multifunctional photothermal hydrogels.</p>

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Synergistic enhancement of photothermal and mechanical properties in PVA hydrogels through polydopamine and silver nanoparticle integration

  • 期刊论文

  • 发表日期：

    2025年11月11日

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  • Chaoqun Jiang,
  • Wenyan Zhang,
  • Ling Zhang,
  • Tianhua Wang,
  • Yujie Zhang,
  • Huiwen Yuan

摘要

Photothermally responsive hydrogels with robust mechanical properties are highly desirable for biomedical engineering and wearable applications. Here, a simple and scalable strategy is proposed to fabricate multifunctional polyvinyl alcohol (PVA)-based hydrogels by integrating polydopamine (PDA) and citrate-stabilized silver nanoparticles (Ag NPs). PDA provides broadband light absorption and adhesion, while Ag NPs contribute localized surface plasmon resonance (LSPR) effects and improved conductivity. Successive freeze-thaw cycles promote network densification and microcrystalline formation, further reinforcing the hydrogel matrix. Compared to PVA@PDA hydrogels, the optimized PVA@PDA@Ag hydrogel exhibited superior photothermal conversion and mechanical performance, with maximum load, tensile strength, and yield stress increasing by 2.3-fold, 2.5-fold, and 2-fold, respectively. These enhancements result from the synergistic physical crosslinking effect of PDA and Ag NPs on PVA chains, improved charge and thermal transport, and network crystallization. This work offers a versatile platform for the design of high-performance multifunctional photothermal hydrogels.