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首页> 外文期刊>Spectroscopy >Physical characterisation of microporous and nanoporous polymer films by atomic force microscopy, scanning electron microscopy and high speed video microphotography
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Physical characterisation of microporous and nanoporous polymer films by atomic force microscopy, scanning electron microscopy and high speed video microphotography

机译：通过原子力显微镜，扫描电子显微镜和高速视频显微摄影对微孔和纳米孔聚合物膜进行物理表征

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We report studies of ordered microporous and nanoporous polymer films formed by the evaporation of polymer solutions following exposure to a humid atmosphere. High speed microphotographic (HSMP) studies of the formation process showed that near the surface of the polymer solution, vapour condensation produced near mono-disperse water droplets which form a close-packed monolayer (or ‘breath figure’). Following the evaporation of the solvent, characterisation of the solid by Atomic Force Microscopy and Scanning Electron Microscopy revealed that the surface of the polymer film is characterised by extensive regions of hexagonally close-packed microscopic pores, whose spatial arrangement replicates that of the initial droplet monolayer. Characterisation of sections of the film by Atomic Force Microscopy established that the surficial pores represent open sections of sub-surficial spheroidal cavities formed by encapsulation of the water droplets within the polymer solution. An interesting feature of the results is the occurrence of nano-scale pores at the film surface and at (and within) the walls of the sub-surficial microscopic pores. This is the first physical evidence report of such features in porous polymer films produced by a process involving breath-figures. Their dimensions suggest that more detailed structural investigations will require alternative techniques to conventional, optical methods.
机译：我们报道了有序的微孔和纳米孔聚合物薄膜的研究，这些薄膜是由暴露于潮湿气氛后蒸发的聚合物溶液形成的。高速显微照片（HSMP）对形成过程的研究表明，在聚合物溶液表面附近，在单分散水滴附近产生了蒸汽凝结，形成了一个密堆积的单层（或“呼吸图”）。溶剂蒸发后，通过原子力显微镜和扫描电子显微镜对固体进行表征，结果表明聚合物膜的表面具有广泛分布的六角形密堆积微观孔区域，其空间排列可复制初始液滴单层的空间排列。通过原子力显微镜对膜的部分进行表征，建立了表面孔表示通过将水滴封装在聚合物溶液中而形成的亚表面球状空腔的开放部分。结果的一个有趣的特征是在膜表面和亚表面微观孔壁处（和内部）出现了纳米级孔。这是通过涉及呼吸图的方法生产的多孔聚合物薄膜中此类特征的第一份物理证据报告。它们的尺寸表明，更详细的结构研究将需要替代常规光学方法的替代技术。

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