Vortex-induced aggregation in superfluid helium droplets.

Vortex-induced aggregation in superfluid helium droplets.
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超流氦液滴中涡流引起的聚集。

DOI:
10.1039/c4cp00525b
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发表时间:
2014
期刊:
PCCP
影响因子:
--
通讯作者:
Spence D
Spence D
中科院分区:
--
文献类型:
--
作者:
Spence D

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研究了在氦滴中加入银原子形成银纳米粒子的过程。然后将所得纳米颗粒沉积在薄固体表面上后通过透射电子显微镜成像。在大的氦液滴中,观察到Ag纳米棒链类似于最近报道的轨道样沉积物[Gomez等人,物理修订信函:2012,108,155302]。然而,通过调整实验条件,也可以看到具有几乎均匀的颗粒间间距的球形纳米颗粒链。考虑到球形Ag纳米粒子没有固有的各向异性,唯一可行的解释是这些粒子必须通过与跨越氦滴直径的量子化涡旋相互作用而被引导到适当的位置。此外,在Ag之后立即向液滴中添加Si导致Si插入Ag纳米颗粒之间以形成连续的纳米线。这消除了当氦液滴与沉积基底碰撞时分段的Ag纳米结构是纳米线碎裂的结果的可能性。因此,分段银链被证明是一个内在的特点,银聚集在氦滴中的量子化涡旋的存在。
The formation of Ag nanoparticles by the addition of Ag atoms to helium droplets has been investigated. The resulting nanoparticles were then imaged by transmission electron microscopy after being deposited on a thin solid surface. In large helium droplets chains of Ag nanorods were observed similar to recently reported track-like deposits [Gomez et al., Phys. Rev. Lett., 2012, 108, 155302]. However, by adjusting the experimental conditions chains of spherical nanoparticles could also be seen with a nearly uniform inter-particle spacing. Given that spherical Ag nanoparticles have no intrinsic anisotropy, the only viable explanation is that these particles must be guided into position by interaction with a quantized vortex spanning the diameter of the helium droplet. Furthermore, addition of Si to the droplets immediately after Ag resulted in Si inserting between the Ag nanoparticles to form continuous nanowires. This eliminates the possibility that the segmented Ag nanostructures are the result of nanowire fragmentation when the helium droplets collide with the deposition substrate. Thus segmented Ag chains are shown to be an intrinsic feature of Ag aggregation in helium droplets in the presence of a quantized vortex.
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