Two-dimensional polymers investigated by scanning near-field optical microscopy: Conformation of single polymer chain in monolayer
Two-dimensional polymers investigated by scanning near-field optical microscopy: Conformation of single polymer chain in monolayer
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DOI：
10.1016/j.polymer.2005.05.056
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发表时间：
2005-07-25
期刊：
影响因子：
4.6
通讯作者：
Ito, S
中科院分区：
文献类型：
--
作者：
Aoki, H;Anryu, M;Ito, S
用扫描近场光学显微镜(SNOM)研究了限制在二维平面内的单链聚合物的构象。用SNOM直接观察到大分子量约为5×106的聚甲基丙烯酸异丁酯(PiBMA)单分子膜中的单一染料标记链为直径200-300 nm的圆形。观察到的链尺寸比计算机模拟产生的自回避随机游动链小得多，表明聚合物链在二维上呈收缩构象。对分散在低分子量1000倍的基质单层中的标记的PiBMA链进行了SNOM成像。分离在短链之间的长链具有与随机构象一样大的扩展形式。这些结果与标度理论很好地吻合，首次为单链构象的SNOM真实图像提供了明确的证据。(C)2005爱思唯尔有限公司。保留所有权利。
The conformation of single polymer chain restricted in a two-dimensional plane was studied by scanning near-field optical microscopy (SNOM). The single dye-labeled chain in a monolayer of poly(isobutyl methacrylate) (PiBMA) with a high molecular weight of ca. 5 X 106 was directly observed by SNOM as a circular shape with a diameter of 200-300 nm. The observed chain size was considerably smaller than that for a self-avoiding random walk chain generated by computer simulation, indicating that the polymer chain takes a contracted conformation in two dimensions. SNOM imaging was carried out for the labeled PiBMA chain dispersed in the matrix monolayer with 1000-times lower molecular weight. The long chain isolated among shorter chains had an expanded form as large as a random conformation. These results were in good agreement with the scaling theory, providing an unambiguous evidence for the first time with the real image for a single chain conformation by SNOM. (c) 2005 Elsevier Ltd. All rights reserved.