Hydrodynamic transformation of a freestanding polymer nanosheet induced by a thermoresponsive surface

Toshinori Fujie, Jin Young Park, Atsushi Murata, Nicel C. Estillore, Maria Celeste R. Tria, Shinji Takeoka*, Rigoberto C. Advincula

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)


Freestanding quasi-two-dimensional ultrathin films (e.g., 41 nm thick polymer nanosheets) were produced, on which stimuli-responsive 47 nm thick polymer brushes were constructed by atom transfer radical polymerization (ATRP) of poly(N-isopropylacrylamide). The resulting surfaces of the multilayered polysaccharide ultrathin films were evaluated by ellipsometry, IR imaging, in situ variable-temperature atomic force microscopy (AFM), and contact angle measurements. The morphological transformation of the freestanding polymer nanosheet bearing thermoresponsive polymer brushes was observed macroscopically through reversible structural color changes at the air?water interface. The dynamic shape change of the nanosheet was also monitored with the addition of a surfactant such as sodium n-dodecylsulfate to reduce the hydrophobicity of the surface. It was then demonstrated that the highly flexible freestanding polymer nanosheet is capable of acting as a unique platform for inducing stimuli-responsive behavior in nanomaterials.

Original languageEnglish
Pages (from-to)1404-1413
Number of pages10
JournalACS Applied Materials and Interfaces
Issue number7
Publication statusPublished - 2009 Jul 29


  • atom transfer radical polymerization (ATRP)
  • layer-by-layer
  • polymer nanosheet
  • polysaccharide
  • thermoresponsive surface

ASJC Scopus subject areas

  • Materials Science(all)


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