Monodisperse two-dimensional nanometer size clusters of partially fluorinated long-chain acids
Monodisperse two-dimensional nanometer size clusters of partially fluorinated long-chain acids
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DOI：
10.1021/la970951z
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发表时间：
1998-03-31
期刊：
影响因子：
3.9
通讯作者：
Iimura, K
中科院分区：
文献类型：
--
作者：
Kato, T;Kameyama, M;Iimura, K
在一系列部分氟化长链酸的扩散单层中发现了几十纳米大小的二维分子团簇。原子力显微镜图像显示，团簇的大小明显是单分散的。两亲体疏水链的大小随其结构的变化而系统地变化。最小的团簇具有直径为17纳米的圆形。一个团簇由大约700个薄膜分子组成。这些团簇聚集在一起形成没有压缩的毫米大小的宏观域。讨论了这些分子簇的形成机理。由于薄膜材料在扩散过程中的不稳定性，在扩散过程中形成团簇。很明显，在凝聚单层形成的条件下，两亲分子在扩散过程中形成团簇是相当普遍的。
Two-dimensional molecular clusters of a few tens nanometer size were found in spread monolayers of a series of partially fluorinated long-chain acids. Atomic force microscopy images have revealed that the size of the clusters is sharply monodisperse. The size changes systematically with changing structure of the hydrophobic chain of the amphiphiles. The smallest cluster has a circular shape of 17 nm diameter. One cluster is composed of about 700 film molecules. These clusters gather to form macroscopic domains of millimeter size without compression. A formation mechanism of these molecular clusters is discussed. Clusters are formed during the spreading process due to the instability of the film materials at the spreading process. It was made clear that cluster formation during the spreading is rather general for amphiphiles under the conditions where condensed monolayers are formed.