Phase-separation structure of a monolayer of binary polymer blend studied by fluorescence scanning near-field optical microscopy

被引:25
作者
Aoki, H [1 ]
Sakurai, Y [1 ]
Ito, S [1 ]
Nakagawa, T [1 ]
机构
[1] Kyoto Univ, Grad Sch Engn, Dept Polymer Chem, Kyoto 6068501, Japan
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 1999年 / 103卷 / 48期
关键词
D O I
10.1021/jp992228i
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A phase-separated monolayer of a binary mixture of pyrene-labeled poly(isobutyl methacrylate) (PiBMA-Py) and perylene-labeled poly(octadecyl methacrylate) (PODMA-Pe) was investigated by the fluorescence scanning near-field optical microscope (SNOM); which provided optical images of samples with a high resolution beyond the diffraction limit, by using evanescent field from an aperture smaller than the wavelength of light. Each phase of the PiBMA-Py/PODMA-Pe was selectively imaged as a bright area by choosing the excitation wavelength (325- or 442-nm line of a He-Cd laser). The fluorescence SNOM enabled mapping of the excitation energy transfer efficiency on the monolayer plane. The energy transfer measurement revealed that the phase separation of the PiBMA-Py/PODMA-Pe blend at the air/water interface was almost completed by annealing for 60 min at 40 degrees C and the phase boundary had a width of a few hundred nanometers.
引用
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页码:10553 / 10556
页数:4
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