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  • 1Institute of Physical Chemistry, RWTH Aachen University, 52056 Aachen, Germany.

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|May 10, 2018
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Summary
This summary is machine-generated.

Hollow microgels respond differently to crowding than regular ones. Their internal cavities allow network expansion, leading to unique structural changes and a two-step compression transition.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Soft Matter Physics

Background:

  • Microgels are polymer networks that swell or shrink in response to stimuli.
  • Hollow microgels possess an internal void, differentiating them from conventional solid microgels.
  • Understanding microgel behavior in crowded environments is crucial for applications like drug delivery and tissue engineering.

Purpose of the Study:

  • To investigate the structural response of hollow poly(N-isopropylacrylamide) microgels in crowded environments.
  • To compare the compression behavior of hollow microgels with regular microgels.
  • To elucidate the role of the internal cavity in microgel deformation.

Main Methods:

  • Small-angle neutron scattering (SANS) with contrast variation to probe microgel structure.
  • Direct measurement of microgel form factors under varying compression.
  • All-atom molecular dynamics simulations to support experimental findings and explore higher compression regimes.

Main Results:

  • Hollow microgels exhibit decreased cavity size with increasing concentration, indicating an alternative compression mechanism.
  • The internal cavity allows the polymer network to expand inwards under compression.
  • A two-step compression transition was observed: initial compression without structural change, followed by shell collapse and cavity size reduction.

Conclusions:

  • The internal cavity provides hollow microgels with unique deformation pathways in response to external pressure.
  • Hollow microgels demonstrate distinct structural responses compared to regular microgels in dense systems.
  • Computer simulations revealed microgel faceting at higher compression levels, unattainable experimentally.