Micro-Brownian Motion of Polymer Segments in a Monolayer at the Air−Water Interface: A Time-Resolved Study of Intralayer Energy Transfer
Micro-Brownian Motion of Polymer Segments in a Monolayer at the Air−Water Interface: A Time-Resolved Study of Intralayer Energy Transfer
复制标题
空气-水界面单层聚合物链段的微布朗运动：层内能量转移的时间分辨研究
DOI：
10.1021/ma9464276
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
Masahide Yamamoto
中科院分区：
文献类型：
--
作者：
S. Ito;S. Ôki;N. Sato;Masahide Yamamoto
这项工作涉及聚合物片段在水面上的微布朗运动，这是观察到的荧光探针的横向扩散附着在聚合物链上。用菲（P：能量供体）和蒽（A：能量受体）标记的聚（乙烯基辛醛缩醛）散布在水面上，形成一个稳定的单层，其中探针能够在二维平面上采取统计随机分布。P探针和A探针之间能量传递的时间分辨荧光分析使我们能够评估聚合物片段在水面上的受体密度和横向扩散系数。通过蒙特卡罗模拟，将荧光衰减数据与理论预测拟合得到了结果。发现该聚合物形成一个粘性的单层，聚合物片段在其中发生横向扩散，扩散系数约为8 × 10-8 cm2 s-1。
This work is concerned with micro-Brownian motion of polymer segments on a water surface, which is observed as the lateral diffusion of fluorescence probes attached to the polymer chains. Poly(vinyl octanal acetal)s labeled with phenanthrene (P: energy donor) and anthracene (A: energy acceptor) are spread on water, yielding a stable monolayer in which the probes are able to take statistically random distributions in the two-dimensional plane. The time-resolved fluorescence analysis of the energy transfer between the P and A probes allows us to evaluate the acceptor densities and lateral diffusion coefficients of polymer segments on the water surface. The result is obtained by fitting the fluorescence decay data with the theoretical prediction by the Monte Carlo simulation. It is found that this polymer forms a viscous monolayer, in which the lateral diffusion of polymer segments takes place with a diffusion coefficient of ca. 8 × 10-8 cm2 s-1.