SURFACE-DIRECTED SPINODAL DECOMPOSITION
SURFACE-DIRECTED SPINODAL DECOMPOSITION
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DOI：
10.1103/physrevlett.66.1326
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发表时间：
1991-03-11
影响因子：
8.6
通讯作者：
WILTZIUS, P
中科院分区：
文献类型：
--
作者：
JONES, RAL;NORTON, LJ;WILTZIUS, P
用正反光谱法研究了聚乙烯醇（PEP）和过氘化聚乙烯醇（d-PEP）混合物在近表面的旋多分解。与在体中发现的具有随机方向波矢量（和随机相位）的组成波不同，我们观察到的组成波具有与表面垂直的波矢量，并从表面向内传播，保持几个波长的相干性。我们认为这些表面导向的旋量分解波是由d-PEP对表面的优先吸引引起的。
The spinodal decomposition of mixtures of poly(ethylenepropylene) (PEP) and perdeuterated poly(ethylenepropylene) (d-PEP) has been studied near the surface using forward-recoil spectrometry. Instead of the composition waves with randomly oriented wave vectors (and random phases) found in the bulk, we observe composition waves with wave vectors normal to, and which propagate inwards from, the surface, maintaining coherence for several wavelengths. We argue that these surface-directed spinodal decomposition waves are caused by the preferential attraction of the d-PEP to the surface.