| 研究課題/領域番号 |
22K20521
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| 研究機関 | 北海道大学 |
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研究代表者 |
李 薛宇 北海道大学, 先端生命科学研究院, 助教 (80961565)
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| 研究期間 (年度) |
2022-08-31 – 2024-03-31
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| キーワード | rheological response / dynamic bonds / time-salt superposition / phase separation / mechanical property |
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| 研究実績の概要 |
To understand how the building blocks affect the hierarchical structure and performance of polyampholyte hydrogels, in the first year, we mainly focused on the role of dynamic bonds on the phase separation and dynamic mechanical behaviors.
Using salt to control the strength of ionic bonds, we found the phase separation size and phase contrast changed significantly with the salt concentrations. In addition, we demonstrate that the salt effect on mechanical properties, including small-strain moduli, large deformation energy dissipation, and fracture stretch ratio, can be effectively converted into frequency or strain rate dependences, following the time-salt superposition principle. The time-salt superposition principle of mechanical properties is not affected by the phase structure.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
In this fiscal year, we have successfully revealed the effect of ionic strengths on the phase separation and mechanical properties of polyampholyte hydrogels. Particularly, the time-salt superposition principle revealed in this fiscal year is critical for effectively controlling the mechanical properties in future studies. Based on these results, the progress is smooth.
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| 今後の研究の推進方策 |
The next study will investigate how the phase structure, and mechanical properties of polyampholyte hydrogels are affected by varied chemical components and dynamic behaviors. The correlation between the hierarchical structure and performances will be revealed.
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| 次年度使用額が生じた理由 |
We will customize gel cutter with pure shear geometry, and buy a camera to track crack growth, some chemicals, glasses, glues, etc. In addtion, we will go to spring-8 and PF to measure SAXS or USAXS.
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