We apply a surface thermal fluctuation spectroscopy technique to investigate the liquid nature of ionic liquid (IL) thin films and micro-droplets. While the spectrum for bulk IL was well explained by a simple Newtonian fluid model, a significant contribution of viscoelasticity was suggested for the vacuum-deposited thin films and micro-droplets. For a sample of IL micro-droplets with statistical distributions of their size and thickness, the scanning surface fluctuation spectroscopy was demonstrated to spatially map out the thickness and viscoelasticity values for effectively investigating the correlation between them, successfully reproducing a typical surface morphology of the sample as well.

我们应用表面热波动光谱技术来研究离子液体 (IL) 薄膜和微滴的液体性质。虽然块体 IL 的光谱可以通过简单的牛顿流体模型很好地解释，但建议粘弹性对真空沉积的薄膜和微液滴有显着贡献。对于具有大小和厚度统计分布的 IL 微滴样品，扫描表面波动光谱被证明可以在空间上绘制出厚度和粘弹性值，以有效地研究它们之间的相关性，成功地再现了样品的典型表面形态以及。