Elucidation of meso-dynamics of soft matter using AC active microrheology

2016 Fiscal Year Final Research Report

• Project/Area Number: 26287100
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Biological physics/Chemical physics/Soft matter physics
• Research Institution: Kyushu University
• Principal Investigator: Kimura Yasuyuki 九州大学, 理学(系)研究科(研究院), 教授 (00225070)
• Research Collaborator: IWASHITA Yasutaka 九州大学, 大学院理学研究院, 助教 (50552494)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: マイクロレオロジー / 光ピンセット / 複素力学応答スペクトル / ホログラフィック顕微鏡 / ３次元追跡

Outline of Final Research Achievements

In order to understand the structure and dynamics of soft matter complex fluids, it is necessary to obtain knowledge about their response at mesoscale. In this study, we have developed an AC active microrheology measurement system to study the local mechanical properties of soft matter. We measured the amplitude and phase lag of displacement of a micron-sized probe particle under AC external force applied by optical tweezers. We also developed a holographic microscope that enables simultaneous observation of three dimensional displacement of multiple particles from a hologram caused by interference between the incident and the scattered light when probe particles are irradiated with laser light. With this method, we succeeded in tracking of multiple self-propelled particles in three dimension.

Free Research Field

ソフトマター物理学