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Alternating Magnetic Field-Responsive Hybrid Gelatin Microgels for Controlled Drug Release
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Structure of multiresponsive "intelligent" core-shell microgels.

Ingo Berndt1, Jan Skov Pedersen, Walter Richtering

  • 1Institute of Physical Chemistry, University of Aachen, Landoltweg 2, D-52056 Aachen, Germany.

Journal of the American Chemical Society
|June 30, 2005
PubMed
Summary

This study explores doubly temperature-sensitive core-shell microgels, revealing how polymer interactions influence swelling. The core and shell mutually affect each other

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Area of Science:

  • Polymer Science and Engineering
  • Materials Science
  • Soft Matter Physics

Background:

  • Core-shell microgels are advanced polymer networks with tunable properties.
  • Temperature-sensitive polymers exhibit volume phase transitions at specific temperatures (LCSTs).
  • Understanding the interplay between core and shell in microgels is crucial for applications.

Purpose of the Study:

  • To investigate the structural behavior of doubly temperature-sensitive core-shell microgels.
  • To elucidate the mutual influence of core and shell swelling on microgel dimensions.
  • To analyze microgel morphology across different temperature regimes relative to polymer LCSTs.

Main Methods:

  • Small-angle neutron scattering (SANS) was employed to probe microgel structure.
  • A novel universal form factor model was applied for data analysis.
  • Radial density profiles were determined at various temperatures.

Main Results:

  • Above both lower critical solution temperatures (LCSTs), a two-box profile with narrow interfaces was observed.
  • Between the LCSTs, the swollen shell expanded the core dimensions.
  • Below both LCSTs, the shell restricted core swelling, leading to a smaller core than in its native state.

Conclusions:

  • The study demonstrates a significant mutual influence between core and shell swelling in temperature-sensitive microgels.
  • The observed structural changes are directly linked to the distinct LCSTs of the core and shell polymers.
  • These findings provide insights into designing responsive materials with controlled swelling behavior.