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Thermoresponsive Core-Shell Nanoparticles: Does Core Size Matter?

Martina Schroffenegger1, Erik Reimhult2

  • 1University of Natural Resources and Life Sciences Vienna, Muthgasse 11, 1190 Vienna, Austria. martina.schroffenegger@boku.ac.at.

Materials (Basel, Switzerland)
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Summary
This summary is machine-generated.

Nanoparticle curvature minimally impacts aggregation temperature (CFT) but significantly affects the polymer shell

Keywords:
core-shell nanoparticlecritical flocculation temperature (CFT)dynamic light scattering (DLS)dynamic scanning calorimetry (DSC)lower critical solution temperature (LCST)poly(2-isopropyl-2-oxazoline) (PiPOx)reversible nanoparticle aggregationsize and curvature dependencespherical polymer brush shellsuperparamagnetic iron oxide nanoparticles (SPION)thermoresponsive polymer

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Area of Science:

  • Polymer science
  • Nanotechnology
  • Colloid science

Background:

  • Hydrophilic polymer-grafted nanoparticles offer high colloidal stability.
  • Thermoresponsive polymers can induce reversible aggregation upon heating due to hydration loss.

Purpose of the Study:

  • To investigate how nanoparticle curvature influences the critical solution temperature (CST) of poly(2-isopropyl-2-oxazoline) (PiPOx) shells.
  • To determine the effect of curvature on the critical flocculation temperature (CFT) of nanoparticle dispersions.

Main Methods:

  • Utilized temperature-cycled dynamic light scattering and differential scanning calorimetry.
  • Studied nanoparticles with core diameters ranging from 5 to 21 nm.
  • Analyzed various concentrations of nanoparticle dispersions.

Main Results:

  • Core size and curvature showed minor effects on particle aggregation (CFT) and cluster size.
  • Nanoparticle curvature significantly influenced the CST of the grafted PiPOx polymer shell.
  • Observed three distinct solvation transitions in the polymer shells, controlled by core curvature.

Conclusions:

  • The CST of the innermost polymer brush layer correlates with the CFT of the nanoparticle dispersion.
  • Core curvature dictates the solvation behavior and transitions within dense polymer brushes on nanoparticles.
  • Understanding these curvature-dependent effects is crucial for designing stable nanoparticle systems.