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Stimuli-Responsive Shapeshifting Mesoporous Silica Nanoparticles.

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  • 1Department of Chemistry, Dalhousie University , Halifax, Nova Scotia B3H 4R2, Canada.

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Researchers developed inorganic silica-based shape-changing materials responsive to water vapor. These novel materials transform shape due to capillary forces and silica condensation, opening new avenues for stimuli-responsive applications.

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capillary forcemesoporous silicananoparticlesshape changestimuli-responsive

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Stimuli-responsive materials are crucial for catalysis, sensing, and drug delivery.
  • Existing responsive materials often rely on soft components.

Purpose of the Study:

  • To present a novel one-pot synthesis for inorganic silica-based shape-changing materials.
  • To investigate the water vapor-induced shape transformation mechanism of these materials.

Main Methods:

  • Synthesis of aminated mesoporous silica nanoparticles (MSNs).
  • Water vapor exposure treatment.
  • Characterization using nitrogen sorption and solid-state (29)Si NMR spectroscopy.

Main Results:

  • Silica-based MSNs changed shape from hexagonal to star-like upon water vapor exposure.
  • Mesopores shrank, leading to decreased mesopore volume and broader size distribution.
  • Increased silica condensation and siloxane bond formation were observed, linked to shape change.

Conclusions:

  • A mechanism involving anisotropic shrinkage due to capillary forces and buckling deformation is proposed.
  • Water vapor triggers shape change beyond 50% humidity.
  • This work introduces inorganic components for novel stimuli-responsive materials.