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Laser heating of core-shell colloids causes hydrogel shells to shrink, transitioning their motion from Brownian to superdiffusion. This study quantifies temperature increases and shell deswelling using dynamic light scattering.

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Area of Science:

  • Colloid and Polymer Science
  • Soft Matter Physics
  • Nanotechnology

Background:

  • Core-shell colloids with gold nanoparticle cores and hydrogel shells are designed.
  • The hydrogel shells exhibit temperature-dependent volume phase transitions.
  • Localized surface plasmon resonance of gold nanoparticles enables laser heating.

Purpose of the Study:

  • Investigate the dynamics of core-shell colloids under laser-induced heating.
  • Quantify the temperature increase and hydrogel shell deswelling.
  • Analyze the transition from Brownian motion to superdiffusion.

Main Methods:

  • Angle-dependent pump-probe dynamic light scattering.
  • Utilizing gold nanoparticles for localized laser heating.
  • Monitoring intensity-time autocorrelation functions.

Main Results:

  • Laser heating induces a transition from Brownian motion to superdiffusion.
  • Temperature increases up to 10 K were estimated.
  • Significant deswelling of hydrogel shells was observed upon heating.

Conclusions:

  • Laser heating effectively controls the dynamics and volume phase transition of core-shell colloids.
  • Dynamic light scattering is a suitable method for studying these phenomena.
  • The findings have implications for designing responsive soft materials.