柔软,热敏的微凝的光子晶体中的液体-固体过渡
M Hildebrandt1, D Pham Thuy1, J Kippenberger1
1Institut für Physikalische Chemie I: Kolloide und Nanooptik, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, D-40225 Düsseldorf, Germany. karg@hhu.de.
Soft matter
|September 11, 2023
概括
我们开发了具有热敏聚N-异烯胺 (PNIPAM) 的核心微凝,以精确研究软合体中的液体-固体过渡. 这些微凝能够准确地确定相位边界,并具有毫克尔文温度控制.
科学领域:
- 软物质物理学 软物质物理学
- 体科学是一门学科.
- 材料科学是一种材料科学.
背景情况:
- 微凝是软合体的模型系统,可调节的体积分数响应温度等外部刺激.
- 在软合体中研究相位过渡是具有挑战性的,因为很难确定它们的实际体积和相位边界.
研究的目的:
- 设计和利用具有刚性芯和热敏PNIPAM外的核心外微凝作为理想的模型系统.
- 通过控制微凝体积以毫克尔文精度,精确地研究温度诱导的软合体中的流体-固体相变.
主要方法:
- 用芯和可调节的PNIPAM外制造核心外微凝.
- 吸收光谱法以确定各种度的结晶和化温度.
- 小角X射线散射 (SAXS) 用于分析流体和固体相,晶体结构和体积分数.
- 对SAXS数据的形式因子分析,以研究透性脱水.
主要成果:
- 具有PNIPAM外的核心外微凝可以精确研究由毫克尔文温度变化引发的液体-固体过渡.
- 吸收光谱学成功地确定了结晶和化的不同温度范围.
- 化导致光子晶体在可见光谱中具有狭窄的布拉格峰值.
- 萨克斯证实了流体相结构,固体相长距离顺序,并揭示了超出硬球包装极限的透性脱水.
结论:
- 具有热反应性外的核心外微凝是研究软合体相位行为的优秀模型系统.
- 开发的系统允许准确确定相位过渡边界和结构分析.
- 这些发现为在高体积分数下软合体的行为提供了洞察力,包括透性脱水.
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