Intriguing transmission electron microscopy images observed for perpendicularly oriented cylindrical microdomains of block copolymers.
Intriguing transmission electron microscopy images observed for perpendicularly oriented cylindrical microdomains of block copolymers.
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DOI：
10.1039/c4nr02074j
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发表时间：
2014-08
期刊：
影响因子：
6.7
通讯作者：
H. Ohnogi;T. Isshiki;S. Sasaki;S. Sakurai
中科院分区：
文献类型：
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作者：
H. Ohnogi;T. Isshiki;S. Sasaki;S. Sakurai
用透射电子显微镜（TEM）观察了嵌段共聚物（聚苯乙烯-嵌段-聚乙烯丁烯-嵌段-聚苯乙烯三嵌段共聚物）薄膜中六方堆积圆柱形微区的位错结构。将聚苯乙烯（PS）圆柱体包埋在聚乙烯丁烯（PEB）基质中，并垂直于薄片表面定向，用于TEM观察。为了理解这种奇怪的位错结构，我们应用了图像处理技术，使用二维傅里叶变换（FT）和傅里叶逆变换（IFT）方法。结果发现，这些有趣的图像并不归因于真实的位错结构，而是由于具有轻微失配取向的六边形重叠引起的莫尔效应而产生的假位错结构。此外，可以通过使用FT和IFT方法的图像处理来识别晶粒间界。
Intriguing images of dislocation structures were observed by the transmission electron microscopy (TEM) technique for hexagonally packed cylindrical microdomains in a block copolymer (polystyrene-block-polyethylenebutylene-block-polystyrene triblock copolymer) film. The polystyrene (PS) cylinders were embedded in the polyethylenebutylene (PEB) matrix and oriented perpendicular to the surface of the thin section for the TEM observations. In order to understand such strange dislocation structures, we applied an image processing technique using two-dimensional Fourier transform (FT) and inverse Fourier transform (IFT) methods. It was found that these intriguing images were not ascribed to real dislocation structures but were fake ones due to the moiré effect caused by the overlapping of hexagons with a slightly mismatched orientation. Furthermore, grain boundaries in the ultrathin section can be identified by image processing using FT and IFT methods.