通过间层剪切诱导的侧链释放来扩大马丁性分子晶体的巨大热膨胀
Kyoungtae Hwang1, Gwangsik Sin1, Minwoo Jang1
1Functional Composite Materials Research Center, Korea Institute of Science and Technology (KIST), Jeonbuk, 55324, Republic of Korea.
Angewandte Chemie (International ed. in English)
|September 10, 2024
概括
具有巨大热膨胀 (TE) 的分子晶体显示出显著的体积变化. 这项关于p-TIPS-DSB的研究揭示了分子动力学如何增强TE,使它们成为微机应用的理想选择.
科学领域:
- 材料科学 材料科学 材料科学
- 晶体学 晶体学是指结晶学.
- 纳米技术纳米技术
背景情况:
- 呈现巨大热膨胀 (TE) 的分子晶体提供了与温度的实质性,线性体积变化.
- 这些材料由于它们的响应性分子运动,对微机应用具有前景.
- 了解功能单元动态和TE之间的联系对于材料设计至关重要.
研究的目的:
- 研究功能单元的动态性与分子晶体中的巨大热膨胀 (TE) 行为之间的关系.
- 分析阶段过渡及其对p-TIPS-DSB的TE特性的影响.
- 评估p-TIPS-DSB在微机应用中的潜力.
主要方法:
- 关于p-TIPS-DSB晶体结构和相变的表征.
- 测量不同阶段的热膨胀系数.
- 评估力密度和运动控制能力.
主要成果:
- 该p-TIPS-DSB晶体经历相变 (α到β) 与合作层间剪切,增加侧链的移动性.
- 体积测量TE系数几乎翻了一番,从255.3增加到444.9MK-1,操作方向TE从175.0增加到291.7MK-1.
- p-TIPS-DSB表现出显著的延伸/收缩 (4.5%),高力密度 (>1.4×107 N m-3) 和精确的,无歇斯底里的运动控制.
结论:
- 分子晶体中的功能单元的动态性与巨大的TE行为直接相关.
- p-TIPS-DSB在相位过渡后表现出增强的TE特性,适合执行.
- 杆放大运动可以克服局限性,突出显示微机器中巨大的TE材料的潜力.
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