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Stimuli-Responsive, Shape-Transforming Nanostructured Particles.

Junhyuk Lee1, Kang Hee Ku1, Mingoo Kim1

  • 1Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea.

Advanced Materials (Deerfield Beach, Fla.)
|June 6, 2017
PubMed
Summary
This summary is machine-generated.

Researchers developed smart polymer particles that change shape with temperature. These temperature-responsive particles, made from block copolymers and surfactants, offer potential for advanced materials in sensing and drug delivery.

Keywords:
PNIPAM surfactantsblock copolymer particlesresponsive particlesshape-transformtemperature-responsiveness

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Developing stimuli-responsive materials is crucial for creating advanced smart materials.
  • Controlling particle shape and morphology is key to tailoring material properties.

Purpose of the Study:

  • To investigate the temperature-driven shape transformation of polymer particles.
  • To explore the use of temperature-responsive surfactants in creating anisotropic particles.

Main Methods:

  • Utilized polystyrene-b-poly(4-vinylpyridine) (PS-b-P4VP) block copolymers.
  • Employed poly(N-isopropylacrylamide) (PNIPAM) as a temperature-responsive surfactant.
  • Controlled particle shape by adjusting temperature relative to the surfactant's lower critical solution temperature (LCST).

Main Results:

  • Achieved temperature-dependent shape control, forming ellipsoidal particles above the critical temperature and convex lens-shaped particles below it.
  • Demonstrated facile tuning of the transition temperature by using PNIPAM derivatives with varying LCSTs.
  • Showcased reversible shape transformations via solvent-adsorption annealing.

Conclusions:

  • Successfully developed temperature-responsive polymer particles with tunable shapes.
  • Highlighted the potential of these particles for applications in sensing, smart coatings, and drug delivery.
  • Established a method for creating anisotropic particles with controlled morphology.