| Project/Area Number |
22K14738
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 35020:Polymer materials-related
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| Research Institution | Okinawa Institute of Science and Technology Graduate University |
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Principal Investigator |
Calabrese Vincenzo 沖縄科学技術大学院大学, マイクロ・バイオ・ナノ流体ユニット, ポストドクトラルスカラー (40895413)
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| Project Period (FY) |
2022-04-01 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | polymers / colloids / rheology / microfluidics / polymer / colloidal rods / polymer solution / relaxation time / polymer dynamics / Rheology / Colloid / Polymer dynamics / Microfluidics |
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| Outline of Research at the Start |
In the first part of the project, the candidate will focus on understanding the effect of polymer crowding on the flow-induced orientation of tracer colloidal-rods upon simple deformation rates (shearing and extension).
In the second part of the project, more complex flow scenarios will be explored.
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| Outline of Final Research Achievements |
During these two years of the project, the candidate advanced the fundamental understanding of the dynamics of colloidal-rods alignment in polymeric solutions. The candidate has shown that the onset of flow-induced alignment of relatively small colloidal-rods is coupled with the relaxation dynamics of the surrounding polymers. On the contrary, the onset of flow-induced alignment of relatively large colloidal-rods is govern by the bulk viscosity of the polymer solution. This understanding has important conclusions for the primary purpose of the proposed research project. Specifically, this understanding can lead to the development of a technique based on the alignment of colloidal rods, referred to as colloidal-rods alignment micro-rheology (CRAM), to provide quantitative and spatially resolved structural properties of polymeric fluids in complex flows.
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| Academic Significance and Societal Importance of the Research Achievements |
The results obtained with this project indicate that colloidal rod alignment in polymer solutions can be predicted on the basis of the critical shear rate at which polymer coils are deformed by the flow, aiding the synthesis and design of anisotropic materials.
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