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Dual Photothermal and Magnetothermal Responsive Shape Memory Polyurethane with Magnetic Navigation Capability.

Zhiyou Xue1, Maosheng Zhang1, Sizhe Tao1

  • 1State Key Laboratory of Organic-Inorganic Composites, Beijing Laboratory of Biomedical Materials, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China.

ACS Applied Materials & Interfaces
|March 23, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a magnetic shape memory polymer (MPU) for biomedical uses. The MPU offers precise navigation and dual thermal activation, showing potential for advanced medical devices.

Keywords:
dual-responsive shape memorymagnetic navigationpolyurethaneshape memory polymers

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Shape memory polymers (SMPs) are crucial for biomedical applications but face challenges with remote activation, including limited tissue penetration and control.
  • Existing activation methods for SMPs often lack the precision and depth required for complex in vivo procedures.

Purpose of the Study:

  • To develop a multifunctional shape memory polymer system with enhanced remote activation and magnetic navigation capabilities.
  • To integrate magnetic nanoparticles for dual-mode thermal triggering and precise spatial control in biomedical applications.

Main Methods:

  • Synthesized a magnetic polyurethane (MPU) incorporating Fe3O4 nanoparticles and neodymium-iron-boron (NdFeB) microparticles.
  • Utilized external magnetic fields for NdFeB microparticle magnetization and navigation.
  • Employed near-infrared II (NIR-II) light and alternating magnetic fields (AMF) for dual photothermal and magnetothermal activation.

Main Results:

  • The MPU demonstrated superior magnetic navigation control and rapid, efficient shape recovery with high ratios.
  • Fe3O4 nanoparticles enabled dual-mode thermal activation (NIR-II and AMF), offering precise spatial-temporal control.
  • The MPU exhibited excellent mechanical properties, biocompatibility, and minimal cytotoxicity in cell studies.

Conclusions:

  • The developed MPU system successfully integrates magnetic navigation and dual-mode thermal activation for advanced biomedical applications.
  • The material shows significant promise for minimally invasive surgical instruments, smart tissue scaffolds, and targeted drug delivery systems.
  • This platform addresses limitations of traditional SMP activation, paving the way for more sophisticated medical interventions.