利用扫描电镜进行微凝胶动力学表征

S. Tietjen, Richard Sent, P. Fodor, K. Streletzky
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引用次数: 0

摘要

提出了一种利用高分辨率扫描电子显微镜(SEM)成像单个微凝胶颗粒动力学的方法。为了实现这一点,微凝胶分散在离子液体中,由于其低蒸气压,即使在典型电子枪中存在的高真空条件下,它们也能保持悬浮状态。因此,与传统的微凝胶电子显微镜研究相比,不需要样品干燥或冷冻,这保留了它们的形态,同时也允许探测溶液中的微凝胶动力学。将基于单个跟踪粒子的结果与动态光散射(DLS)的结果进行了比较,动态光散射(DLS)测量了大颗粒集体的平均大小和扩散特性。对于尺寸测量,SEM和DLS数据基本一致。对于粒子动力学,监测单个微凝胶运动揭示了复杂的动力学,其中除了预期的热运动外,人们还观察到诸如聚集,旋转和漂移等效应。这与硬球形二氧化硅颗粒的控制样品形成对比,后者的运动主要是扩散的,与DLS研究很好地一致。
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Microgel Dynamics Characterization Using SEM
A methodology for imaging the dynamics of individual microgel particles using high resolution scanning electron microscopy (SEM) is presented. To enable this, the microgels are dispersed in an ionic liquid, which due to its low vapor pressure allows them to remain in suspension even under the high vacuum conditions present in a typical electron gun. Thus, compared with conventional electron microscopy studies of microgels, no sample drying or freezing is necessary which preserves their morphology while also allowing to probe microgel dynamics in solution. The results based on the individually tracked particles are compared with results from dynamic light scattering (DLS) which measures the mean size and diffusion properties of large collectives of particles. For the size measurements, the SEM and DLS data are in general agreement. For the particle dynamics, monitoring individual microgel motion reveals complex dynamics in which, aside from the expected thermal motion, one observes effects such as clustering, rotation and drift. This is in contrast with a control sample of hard sphere-like silica particles where the motion is primarily diffusional in good agreement with DLS studies.
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