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柔软的无形化微丝带.

Mengya Zhu1, Jingzhuo Zhou1, Zezhou He2

  • 1Department of Mechanical Engineering, City University of Hong Kong, Kowloon 999077, Hong Kong SAR, China. yuanhou23@gmail.com.

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概括

无形化微丝带表现出显著的延展性和容错性,在破裂前延长超过50%. 这一发现为开发先进,灵活的陶材料开辟了道路.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术 纳米技术
  • 陶工程 陶工程 陶工程

背景情况:

  • 陶材料的应用受其脆性所限制.
  • 无形化 (a-BN) 提供高热稳定性和介电性质.
  • 在小尺度上,a-BN的机械性质仍然在很大程度上未被研究.

研究的目的:

  • 为了研究合成无形化微丝带的机械性能.
  • 在微观尺度上探索a-BN的延展性和容错性.
  • 阐明观察到的机械行为背后的机制.

主要方法:

  • 使用sol-gel方法从小分子前体合成a-BN微带.
  • 在微带上进行现场单轴拉伸测量.
  • 高分辨率的原子特征和分子动力学模拟.

主要成果:

  • 合成的a-BN微丝带表现出均的延伸,超过50%的应变,表明出色的柔性.
  • 在压力下,a-BN微带表现出令人惊的容错行为.
  • 确定的机制包括拓变形,h-BN层的展开/重定向,层间脱,滑落和层内撕裂.

结论:

  • 无形化微丝带具有特殊的柔性和容错性.
  • 观察到的可塑性源于纳米级复杂的能量消散机制.
  • 这些发现为设计用于先进应用的柔性无形共振键材料铺平了道路.