Journal
APPLIED PHYSICS EXPRESS
Volume 14, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.35848/1882-0786/ac08d1
Keywords
Surface thermal fluctuation spectroscopy; Ionic liquids; Interfacial structure; thin film
Categories
Funding
- Ministry of Education, Culture, Sports, Science, and Technology of Japan [15K13613, 15K05217, 19H02589]
- Foundation Advanced Technology Institute [RG2607]
- Iketani Science and Technology Foundation
- Murata Science Foundation [0281045-A]
- [H28-81]
- Grants-in-Aid for Scientific Research [19H02589, 15K13613, 15K05217] Funding Source: KAKEN
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The study revealed a significant contribution of viscoelasticity in ionic liquid (IL) thin films and micro-droplets. Scanning surface fluctuation spectroscopy was able to spatially map out thickness and viscoelasticity values, successfully reproducing the typical surface morphology of the sample.
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.
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