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首页> 外文会议>Associazione Italiana Di Metallurgia;Dechema;Annual event of the European Federation of Corrosion on European Corrosion Congress;uropean Federation of Corrosion >Non-destructive In-situ Characterization of Microcapsules and Self-healing Coatings using Confocal Raman Spectroscopy
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Non-destructive In-situ Characterization of Microcapsules and Self-healing Coatings using Confocal Raman Spectroscopy

机译：使用共聚焦拉曼光谱技术对微胶囊和自修复涂层进行非破坏性原位表征

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At least since the paper of White et al. the integration of microcapsules into coatings for corrosion protection is a topic of high interest in the corrosion community~2. Various groups have performed research on different kind of capsules or containers for different types of coatings. Self-healing coatings with extrinsic polymer repair mechanisms as well as corrosion inhibition mechanisms have been developed.Most containers up to now have been characterized ex-situ in SEM and TEM when they were not in the coating or by taking cross-sections. However, the sample preparation for such analysis has disadvantages: Samples need to be broken in liquid nitrogen and are analyzed under high vacuum conditions, capsules fall out of the coating, etc. Moreover, capsules with a liquid content like monomers cannot be put into vacuum chambers for obvious reasons.Two other interesting points are the determination of the location of capsules in a coating as well as the question whether the capsule content actually survives the coating procedure.Therefore a technique is necessary which can differentiate between different molecules. This needs to be done at a spatial resolution in the micrometer – preferably down to the nanometer – range. Just as well it needs to be able to record the information in depth and especially without altering the sample. Besides, it would be advantageous if the sample size would be without narrow constraints.Confocal Raman Spectroscopy fulfills these requisites by recording Raman shift spectra of a point location where the laser is focused on in ambient environment. Filled microcapsules in a coating could be distinguished from empty ones and their location (x, y and z) in the coating could be identified by using Confocal Raman Spectroscopy. To the authors’ knowledge there is no other straightforwardtechnique to obtain these results at this scale.These and further results will be presented in order to show and to discuss with the corrosion community and especially the coating community the advances which can be made with this technique.
机译：至少由于White等人的论文。将微囊整合到涂层中以保护腐蚀是腐蚀界的一个重要课题〜2。不同的研究小组针对不同类型的涂料对不同种类的胶囊或容器进行了研究。已经开发出具有外在聚合物修复机制和腐蚀抑制机制的自修复涂层。到目前为止，大多数容器在不在涂层中或通过截取截面时都已在SEM和TEM中进行了异位表征。但是，用于这种分析的样品制备方法有以下缺点：样品需要在液氮中破碎并在高真空条件下进行分析，胶囊从涂层中掉落等。此外，液体含量如单体的胶囊不能置于真空中另一个明显的原因是确定包衣中胶囊的位置以及是否在包衣过程中保存了胶囊内容物，因此有必要区分不同分子的技术。这需要以微米级的空间分辨率（最好低至纳米级）完成。同样，它需要能够深度记录信息，尤其是在不更改样本的情况下。此外，如果样品的大小没有狭窄的限制，那将是有利的。共焦拉曼光谱法通过记录激光在环境中聚焦的点位置的拉曼位移光谱来满足这些要求。可以将涂层中的填充微胶囊与空的微胶囊区分开，并且可以通过使用共聚焦拉曼光谱法确定它们在涂层中的位置（x，y和z）。据作者所知，没有其他直接的技术可以在这种规模上获得这些结果。将提供这些和进一步的结果，以显示并与腐蚀界特别是涂料界讨论，可以用这种技术取得进步。 。

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