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Related Concept Videos

Micelles01:30

Micelles

Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...

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Nanosized core-shell bio-hybrid microgels and their internal structure.

Pia Lenßen1, Rebecca Hengsbach2, Anne Frommelius2

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Super-resolution microscopy reveals how DNA-polymer hybrid microgels form, showing core polymer interpenetration into the shell. This helps predict how well drug molecules can reach the microgel core.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Microgels are tunable materials with diverse applications, but their nanoscale internal structure is difficult to characterize.
  • Understanding core-shell microgel architecture, including interface properties and guest molecule accessibility, is crucial for designing functional materials.

Purpose of the Study:

  • To investigate the core-shell morphology and guest molecule accessibility of bio-hybrid DNA-poly(N-isopropylmethacrylamide) microgels using super-resolution fluorescence microscopy (SRFM).
  • To analyze the impact of shell polymerization stages on microgel structure and internal accessibility.

Main Methods:

  • Utilized super-resolution fluorescence microscopy (SRFM) to visualize nanoscale structures.
  • Employed covalent fluorescence labeling of the core polymer (DNA-poly(N-isopropylmethacrylamide)) and co-polymerization with N,N'-bis(acryloyl)cystamine for shell visualization.
  • Examined microgels at three distinct stages of shell polymerization.

Main Results:

  • Demonstrated core polymer interpenetration into the shell without structural compromise.
  • Quantified the size- and hydrophobicity-dependent accessibility of the microgel core for guest molecules.
  • Provided visual insights into core and shell compartmentalization.

Conclusions:

  • SRFM offers new perspectives on the internal architecture of core-shell microgels.
  • Findings contribute to a deeper understanding of microgel complex behavior.
  • This research can guide the rational design of microgel-based drug delivery systems by considering guest molecule properties.