重构,中断衰老和使用可光开关活性兴奋剂增强体凝的动力学
Mengshi Wei1, Matan Yah Ben Zion2, Olivier Dauchot1
1Gulliver UMR CNRS 7083, ESPCI Paris, PSL Research University, 10 rue Vauquelin, 75005 Paris, France.
Physical review letters
|July 21, 2023
概括
准二维凝中的光激活的Janus粒子创建了一个具有冷动态的更柔软的材料. 这种活性凝在光激活停止后很长一段时间内保留了结构性记忆和增强的运动性.
科学领域:
- 软物质物理学 软物质物理学
- 结合体科学 结合体科学
- 材料科学 材料科学 材料科学
背景情况:
- 准二维凝是复杂的流体,具有独特的结构和动态特性.
- 雅努斯粒子在被光等外部刺激激活时具有可调节的特性.
- 了解凝老化和对外部刺激的反应对于材料设计至关重要.
研究的目的:
- 为了研究用光激活的Janus粒子杂的准2D合体凝中的结构和动态变化.
- 为了确定光诱导活动对凝衰老和记忆的影响.
- 描述短暂活动对凝性质的长期影响.
主要方法:
- 合成含有Janus粒子的准二维凝.
- 使用散射技术监测凝结构和动态.
- 控制光线激活并随后观察材料的反应.
主要成果:
- 在光激活过程中,体网络保持结构完整性.
- 被动粒子的移动性在激活下显示了尺度依赖的行为.
- 凝表现出停止衰老,并在光线停用后保留结构性记忆.
- 与激活前状态相比,运动性仍然很高,这表明凝更柔软.
结论:
- 光激活的Janus粒子可以逆转地改变二维准凝的衰老和动态.
- 凝结构记住了活性状态,导致永久软化状态,并增强了热波动.
- 这些发现为设计具有可调节的长期性能的活性软材料提供了洞察力.
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