Direct Observation of Inner-Layer Inward Contractions of Multiwalled Boron Nitride Nanotubes upon in Situ Heating.

Direct Observation of Inner-Layer Inward Contractions of Multiwalled Boron Nitride Nanotubes upon in Situ Heating.
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原位加热时直接观察多壁氮化硼纳米管内层向内收缩

DOI:
10.3390/nano8020086
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发表时间:
2018-02-04
期刊:
Nanomaterials (Basel, Switzerland)
影响因子:
--
通讯作者:
Li J
Li J
中科院分区:
其他
文献类型:
--
作者:
Li Z;Li ZA;Sun S;Zheng D;Wang H;Tian H;Yang H;Bai X;Li J

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原位加热透射电子显微镜观察清楚地表明,随着样品温度升高,多壁氮化硼纳米管(BNNTs)出现显著的层间膨胀和内层向内收缩。我们将观察到的向内收缩解释为是由于在原位加热时,外层对管状结构中径向膨胀存在强烈约束。加热时样品温度升高会产生朝向管状中心的压力和应力,这推动了晶格运动并导致多壁BNNTs内径收缩。利用一个涉及层状扭曲的波状模式的简单模型,我们讨论了这些特殊的结构变化以及管状结构的各向异性热膨胀特性。此外,我们的原位原子图像还揭示了俄罗斯套娃式BN纳米管,其表现出各向异性热膨胀行为。
In situ heating transmission electron microscopy observations clearly reveal remarkable interlayer expansion and inner-layer inward contraction in multi-walled boron nitride nanotubes (BNNTs) as the specimen temperature increases. We interpreted the observed inward contraction as being due to the presence of the strong constraints of the outer layers on radial expansion in the tubular structure upon in situ heating. The increase in specimen temperature upon heating can create pressure and stress toward the tubular center, which drive the lattice motion and yield inner diameter contraction for the multi-walled BNNTs. Using a simple model involving a wave-like pattern of layer-wise distortion, we discuss these peculiar structural alterations and the anisotropic thermal expansion properties of the tubular structures. Moreover, our in situ atomic images also reveal Russian-doll-type BN nanotubes, which show anisotropic thermal expansion behaviors.
通过四维超快透射电子显微镜记录多壁碳纳米管的各向异性晶格动力学
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