Development of multi-scale phase-shifting optical system and its application to measurement of dynamic wetting of nanofluids

2019 Fiscal Year Final Research Report

• Project/Area Number: 17K14848
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Properties in chemical engineering process/Transfer operation/Unit operation
• Research Institution: Tohoku University
• Principal Investigator: Shoji Eita 東北大学, 工学研究科, 助教 (20780430)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: エリプソメータ / 位相シフト技術 / ナノフルイド / ナノ液膜 / 可視化

Outline of Final Research Achievements

Nanofluids are suspensions of nanoparticles and recently have attracted attention because the nanofluids are expected as nano-ink for printed electronics technique. In the printing process, the dynamic behavior of microscopic wetting near the contact line is important. Therefore, we developed a multi-scale phase-shifting optical system, which allows us to measure the two-dimensional thickness distribution of thin films, to elucidate microscopic wetting behaviors of nanofluids in this study. Measurement of the microscopic wetting behavior using the optical system when the nanofluid droplets move on the silicon substrate was performed. The measurement results revealed that the effects of adding nanoparticles on the characteristics of microscopic wetting behavior, such as contact angle less than 1° and precursor film length.

Free Research Field

化学工学

Academic Significance and Societal Importance of the Research Achievements

ナノフルイドは，プリンテッドエレクトロニクス用ナノインクなどへの応用が期待される新たな機能性流体材料である．ナノフルイドをナノインクとして使用する印刷プロセスにおいて，作製するパターン形状などの高精度化にはナノフルイドの微視的な濡れ性の動的挙動の解明は不可避の課題である．本研究は，ナノフルイドの微視的濡れ挙動に及ぼす各種因子の影響を実験的に明らかにするものである．