Thermoresponsive structural change of a poly(N-isopropylacrylamide) graft layer measured with an atomic force microscope

Satoru Kidoaki, Shoji Ohya, Yasuhide Nakayama, Takehisa Matsuda

Research output: Contribution to journalArticle

138 Citations (Scopus)

Abstract

To directly characterize the thermoresponsive structural changes of a poly(N-isopropylacrylamide) (PNIPAAm) graft layer at the microscopic level, the force-distance curve (f-d curve) was measured on a well-tailored end-grafted PNIPAAm surface in aqueous solution at 25 and 40 °C, using an atomic force microscope (AFM). The PNIPAAm surface was prepared by an iniferter-based photograft polymerization technique. The approach trace of the f-d curve exhibited a steric repulsion profile at 25 °C, while the range of repulsion decreased 1/10 to 1/20 at 40 °C, confirming the ascending-heat-induced collapse of the PNIPAAm graft layer. The change in thickness of the graft layer was complementarily measured from the scanning images of the boundary between the grafted and nongrafted regions under well-defined scanning forces. The thermoresponsive characteristics of the PNIPAAm graft layer including its interaction with proteins and the applied-load dependence of the measured graft thickness are discussed.

Original languageEnglish
Pages (from-to)2402-2407
Number of pages6
JournalLangmuir
Volume17
Issue number8
DOIs
Publication statusPublished - Apr 17 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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