Metal Clusters and Nanoalloys - From Modeling to Applications
Metal Clusters and Nanoalloys - From Modeling to Applications
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金属簇和纳米合金 - 从建模到应用
DOI：
10.1007/978-1-4614-3643-0_8
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Baletto F
中科院分区：
文献类型：
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作者：
Baletto F
Janus粒子是两个半球上具有不同，通常甚至相反的化学组成的分隔对象，这使它们成为介观和纳米尺度上的一类独特材料。这个名字让人联想到古罗马的两面神雅努斯（Janus），他的两个头朝相反的方向看，同时向前看未来，向后看过去。首先由Casagrande和Veyssie（Compt Rend Ac Sci 306：1423，1988）提出一个亲水和一个疏水的半球，由de Gennes在他的诺贝尔演讲中作为“具有极性和非极性面孔的新动物”引起国际关注，Janus粒子由于其广泛的技术应用而越来越重要。由于它们的拓扑选择性和功能化涂层，它们被用作表面活性剂，药物递送和催化剂。软物质的柔性被认为适用于双金属纳米合金，其中Janus图案代表分层偏析效应，导致簇中的两个不同化学区域。Janus纳米合金在磁光应用中已经被提出，例如纺织品上的结构着色，以及在存在/不存在磁场的情况下作为触发器开关。Janus粒子的数值模拟是理解和驱动其合成和制备的有用工具。在本章中，注意力集中在，但不限于，双-comparmentalised nanoalloys，金铂（AgPt）和银钴（AgCo）的情况下，作为范例的例子，在那里的生长的建模。
Janus particles are compartmentalised objects with different, usually even opposite, chemical make-ups on their two hemispheres, which make them a unique class of materials at the meso- and nanoscale. The name is reminiscent of Janus the ancient Roman god with two heads looking in opposite directions, simultaneously forward to the future and backward to the past.First made by Casagrande and Veyssie (Compt Rend Ac Sci 306:1423, 1988) of one hydrophilic and one hydrophobic hemisphere, raised to an international attention as “new animals with a polar and an apolar face” by de Gennes in his Nobel lecture, Janus particles are acquiring more and more importance because of their wide range of technological applications. Thanks to their toposelective and functionalised coating, they are utilised as surfactants, drug-delivers and catalysts. The flexibility proper of soft matter has been thought to be applied to bimetallic nanoalloys where the Janus motif represents a layered segregation effect leading to two different chemical regions in the cluster. Janus nanoalloys have been proposed in magneto-optical applications, such as structural colourations on textile, and as flip-flop switchers in the presence/absence of a magnetic field.The numerical modelling of Janus particles is a useful tool to understand and drive their synthesis and preparation. In this chapter, the attention is focused, but not limited, on the modelling of the growth of bi-comparmentalised nanoalloys, where the cases of gold–platinum (AgPt) and silver–cobalt (AgCo) are presented as paradigmatic examples.