层状钛酸钠纳米线超大弯曲行为的原子尺度研究
Atomic-Scale Investigation on the Ultra-large Bending Behaviours of Layered Sodium Titanate Nanowires
摘要：
一维层状钛酸盐纳米材料在许多领域有着重要的应用，对其力学性能的研究是十分重要的。本文利用透射电子显微镜对一种陶瓷层状钛酸盐（Na 2 Ti 2 O 4（OH）2）纳米线的弯曲性能进行了原子尺度的非原位和原位研究。纳米线沿方向具有柔性<100>，最大弯曲应变可达37%。通过分析缺陷的行为，这种陶瓷材料的独特的弯曲性能被发现与位错的一种新的安排，一个可访问的成核和沿轴向方向的运动导致从弱的静电相互作用之间的TiO 6层和低b/a比。这些结果提供了开创性的和关键的理解层状钛酸盐纳米线家庭和潜在的其他一维纳米材料的层状晶体结构的弯曲行为。
英文摘要：
Study on mechanical properties of one-dimensional layered titanate nanomaterials is crucial since they demonstrate important applications in various fields. Here, we conducted ex situ and in situ atomic-scale investigation on bending properties of a kind of ceramic layered titanate (Na2Ti2O4(OH)2) nanowires in a transmission electron microscopy. The nanowires showed flexibility along <100> direction and could obtain a maximum bending strain of nearly 37%. By analysing the defect behaviours, the unique bending properties of this ceramic material was found to correlate with a novel arrangement of dislocations, an accessible nucleation and movement along the axial direction resulting from the weak electrostatic interaction between the TiO6 layers and the low b/a ratio. These results provide pioneering and key understanding on bending behaviours of layered titanate nanowire families and potentially other one-dimensional nanomaterials with layered crystalline structures.
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