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Asymmetric Behavior of Temperature‐Responsive Poly( N ‐isopropylacrylamide) Ultrathin Layers Observed by Atomic Force Microscopy
Author(s) -
Kumashiro Yoshikazu,
Fukumori Kazuhiro,
Akiyama Yoshikatsu,
Itoga Kazuyoshi,
Sakai Kiyotaka,
Yamato Masayuki,
Okano Teruo
Publication year - 2011
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201100158
Subject(s) - octadecyltrichlorosilane , poly(n isopropylacrylamide) , atomic force microscopy , polymer chemistry , substrate (aquarium) , adhesion , chemical engineering , layer (electronics) , contact angle , materials science , adhesive , chemistry , nanotechnology , polymer , composite material , copolymer , oceanography , geology , engineering
During characterization of a temperature‐responsive poly( N ‐isopropylacrylamide) (PIPAAm) layer grafted onto a Si(100) substrate, atomic force microscopy (AFM) is able to probe the interactions between the microscope tip and the polymer. The modification of the AFM tip surface with octadecyltrichlorosilane (OTS) changes the interaction between the PIPAAm surface and the tip. Although a repulsive interaction is observed between a commercially available Si tip and the PIPAAm surface, a strong attractive interaction between the OTS‐modified Si tip and the surface is observed. Adhesion‐force analysis shows changes in the hydrophilic/hydrophobic character of ultrathin PIPAAm surfaces immediately after a change in temperature. The PIPAAm surface becomes hydrophobic less than 30 min after temperature increase, but requires 120 min to become hydrophilic after temperature reduction.