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Surface arrangement of azobenzene moieties in two different azobenzene‐derived Langmiur–Blodgett films
Author(s) -
Feng Chuan Liang,
Qu Guirong,
Song Yanlin,
Jiang Lei,
Zhu Daoben
Publication year - 2006
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.2458
Subject(s) - azobenzene , contact angle , irradiation , materials science , acrylate , wetting , thin film , molecule , photochromism , azo compound , polymer chemistry , copolymer , langmuir–blodgett film , photochemistry , chemical engineering , chemistry , polymer , organic chemistry , nanotechnology , composite material , physics , nuclear physics , engineering
An investigation of two different Langmuir–Blodgett (LB) films, [4‐(6‐oxo‐hexacarboxylic acid)‐3‐trifluoromethyl‐azobenzene] (FAzo5COOH) and copolymer poly{2‐hydroxyethylmethacrylate} 9 ‐ co ‐{6‐[3‐((trifluoromethyl)phenyl)azo] phenoxylhe‐Xylmeth‐acrylate} 1 (PHEMA‐ co ‐PFAzoPHA) films, is reported. The different structural behavior of the two types of films was first analyzed in detail by UV–visible spectroscopy. The different wettability of the films under UV–visible irradiation was subsequently studied by the contact‐angle technique. A large change of the contact angle (CA) was observed on PHEMA‐ co ‐PFAzoPHA films compared to the FAzo5COOH films before and after UV irradiation. The films were finally characterized by atomic force microscopy (AFM), and the morphologies were observed under UV–visible irradiation. The results indicate that the molecules are densely packed in the FAzo5COOH films compared to the PHEMA‐ co ‐PFAzoPHA films. It is attributed to the strong interaction between neighboring azobenzene moieties in the FAzo5COOH LB films of the smaller molecules. Copyright © 2006 John Wiley & Sons, Ltd.