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

Satoru Kidoaki, Shoji Ohya, Yasuhide Nakayama, Takehisa Matsuda

研究成果: Contribution to journalArticle査読

139 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)2402-2407
ページ数6
ジャーナルLangmuir
17
8
DOI
出版ステータス出版済み - 4 17 2001
外部発表はい

All Science Journal Classification (ASJC) codes

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

フィンガープリント 「Thermoresponsive structural change of a poly(N-isopropylacrylamide) graft layer measured with an atomic force microscope」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル