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首页> 外文期刊>Nanotechnology >Dynamic scanning force microscopy investigation of nanostructured spiral-like domains in Langmuir-Blodgett monolayers
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Dynamic scanning force microscopy investigation of nanostructured spiral-like domains in Langmuir-Blodgett monolayers

机译：动态扫描力显微镜研究Langmuir-Blodgett单层纳米结构螺旋状域。

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摘要

The advantages/limitations obtained by working in dynamic scanning force microscopy (DSFM) at different levels of tip/sample interaction forces (from the net attractive to the hard repulsive regime) are experimentally shown by imaging monolayers containing novel fibre-like supramolecular nanostructures wrapped up in spiral-like domains. The structures have been obtained by using the Langmuir-Blodgett technique and transferring onto mica monolayers of quercetin-3-O-palmitate molecules mixed with a fraction of about 25 percent of dimyristoylphosphatidylcholine. The measurements in the attractive regime allowed us to reveal morphological features of the supramolecular structures that cannot be demonstrated by the conventional repulsive regime. In particular, by attractive dynamic scanning force microscopy (DSFMA) the height of the fibre-like structures was a factor of two to three higher and peculiar nano-ruptures along the wrapped fibres have been observed. The influence of the tip/sample contact interaction was investigated by recording images in hard tapping and successively imaging the same region in DSFMA as well as by comparing the images in DSFMA with those obtained in negative lift mode force modulation microscopy, phase imaging and friction force microscopy.
机译：通过在动态扫描力显微镜（DSFM）中以不同水平的尖端/样品相互作用力（从吸引力到硬排斥状态）进行工作，所获得的优势/局限性通过包含包裹的新型纤维状超分子纳米结构的成像单层实验显示出来在螺旋状的领域。通过使用Langmuir-Blodgett技术并将槲皮素-3-O-棕榈酸酯分子与约25％的二肉豆蔻酰基磷脂酰胆碱的一部分混合，转移到云母单分子层上即可获得结构。在吸引人的制度中的测量使我们能够揭示超分子结构的形态学特征，而传统的排斥制度无法证明这一特征。特别地，通过吸引人的动态扫描力显微镜（DSFMA），纤维状结构的高度高出两倍至三倍，并且沿着包裹的纤维观察到了特殊的纳米破裂。通过在硬攻丝中记录图像并连续对DSFMA中的同一区域进行成像，以及通过将DSFMA中的图像与在负升程模式力调制显微镜，相成像和摩擦力中获得的图像进行比较，研究了针尖/样品接触相互作用的影响。显微镜检查。

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