Engineering thermoresponsive polymeric nanoshells

Daniel Cohn*, Hagit Sagiv, Alexandra Benyamin, Gilad Lando

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

This study describes a family of hollow nanoscale constructs able to display a large and reversible change in size, within a narrow temperature interval. These thermoresponsive nanostructures are generated by crosslinking functionalized amphiphilic molecules, such as poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) triblocks, while constrained to their particular micellar configuration. This contribution focuses on the generation of these supramolecular architectures, by intra-micellarly crosslinking PEO-PPO-PEO dimethacrylate amphiphiles, and investigates their temperature-dependent dimensional behavior. Spherical nanoshells displaying a 200 nm diameter at 15 °C, shrink sharply around 28 °C, generating a compact structure of approximately 40 nm at body temperature. Thermoresponsive nanotubes were created by generating them from rod-like micelles at higher temperatures. By varying the composition of the triblock, the transition temperature can be fine tuned, from around 25 °C to slightly above body temperature. Also, the nanoshells were rendered biodegradable by incorporating aliphatic oligoesters into their structure. Numerous applications for these nanostructures are foreseen in various biomedical areas, such as in drug and gene delivery, in the tissue engineering and in the biosensors field.

Original languageEnglish
Pages (from-to)3289-3296
Number of pages8
JournalBiomaterials
Volume30
Issue number19
DOIs
StatePublished - Jul 2009

Keywords

  • Crosslinking
  • Degradation
  • Nanoparticle
  • Pluronics
  • Thermoresponsive polymer

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