Studies on photothermoacoustic phenomena from nanostructured thin films immersed in liquids

2015 Fiscal Year Final Research Report

• Project/Area Number: 25286037
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Nano/Microsystems
• Research Institution: Kyoto University
• Principal Investigator: Suzuki Motofumi 京都大学, 工学(系)研究科(研究院), 教授 (00346040)
• Co-Investigator(Kenkyū-buntansha): NAMURA Kyoko 京都大学, 大学院工学研究科, 助教 (20756803)
• Co-Investigator(Renkei-kenkyūsha): KIMURA Kenji 京都大学, 大学院工学研究科, 教授 (50127073) ; NAKAJIMA Kaoru 京都大学, 大学院工学研究科, 准教授 (80293885)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: サーモプラズモニクス / 動的斜め蒸着 / 自己組織化 / 熱工学 / マイクロ・ナノデバイス / マランゴニ効果

Outline of Final Research Achievements

We have investigated the response of liquids heated by Au nanoparticles with tailored nanomorphology, which are irradiated with a laser of which wavelength is matched with that of plasma resonance. By using our originally developed apparatus, we have succeeded to measure photoacoustic signals from Au nanoparticles irradiated with a pulse laser and have found that they showed the non-linear dependence on fluence of the incident laser.
On the other hand, we have developed a technique to generate microbubbles at our favorite time and locations. In addition, by the local temperature gradient induced by laser irradiation, we have succeeded to generate strong flows around the bubbles.
These techniques are expected to be applied to new engines for microfluids and to focusing/classification of micro- and nanoparticles.

Free Research Field

薄膜・表面・界面物性