Effective temperature of polymer supercooled liquid under flow

2014 Fiscal Year Final Research Report

• Project/Area Number: 25610127
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Biological physics/Chemical physics/Soft matter physics
• Research Institution: Ritsumeikan University
• Principal Investigator: FUKAO Koji 立命館大学, 理工学部, 教授 (50189908)
• Co-Investigator(Renkei-kenkyūsha): SADAKANE Koichiro 立命館大学, 理工学部, 助教 (50585148)
• Research Collaborator: FUJII Yosuke 立命館大学大学院, 理工学研究科, M1
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 非平衡 / 光ピンセット / マイクロレオロジー / 光トラップ / 有効温度

Outline of Final Research Achievements

We developed optical tweezers system in order to measure effective temperature of the non-equilibrium glassy system. First, we built up measurement system as follows: 1) Polarized beam splitter and half-wavelength plate were inserted into optical path to acquire the availability of two laser paths. We confirmed that two different particles could be optically trapped on independent locations. Furthermore, it became also possible to control the position of the trapped particle as we like. 2) We built up the system by which we can observe thermal motions of trapped particles using quadrant photo diodes. With this system, we could obtain spacial and temporal resolution of 10 nm and 10μs. To our regret, we have not yet attained the final destination until now. Even after finishing the planed research period, we shall continue this research project. We will try to do micro rheology experiment to measure effective temperature quantitatively and will discuss the observed results.

Free Research Field

ソフトマター物理学