Out-of-Equilibrium Aggregates and Coatings during Seeded Growth of Metallic Nanoparticles
Out-of-Equilibrium Aggregates and Coatings during Seeded Growth of Metallic Nanoparticles
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DOI：
10.1021/jacs.7b09111
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发表时间：
2017-12-13
影响因子：
15
通讯作者：
Klajn, Rafal
中科院分区：
文献类型：
--
作者：
Sawczyk, Michal;Klajn, Rafal
尽管耗散自组装在自然界中无处不在，它产生了对生命至关重要的结构和功能，但具有这种自组装模式的人工系统的例子很少。在这里，我们确定存在的短暂的组装过程中，金纳米粒子的种子生长。在这个过程中，肼还原Au（III）离子，其附着在现有的纳米颗粒“种子”上。附着伴随着表面活性剂浓度的局部增加，因此在纳米颗粒表面上形成双层，诱导其组装。随着整个溶液中表面活性剂浓度的平衡，所得聚集体逐渐分解。非平衡聚集体的寿命取决于组分纳米颗粒的尺寸，并且可以通过组分纳米颗粒的尺寸来控制。我们证明了我们的平衡外的聚集体的效用，形成极性表面上的瞬态反射涂层。
Although dissipative self-assembly is ubiquitous in nature, where it gives rise to structures and functions critical to life, examples of artificial systems featuring this mode of self-assembly are rare. Here, we identify the presence of ephemeral assemblies during seeded growth of gold nanoparticles. In this process, hydrazine reduces Au(III) ions, which attach to the existing nanoparticles "seeds". The attachment is accompanied by a local increase in the concentration of a surfactant, which therefore forms a bilayer on nanoparticle surfaces, inducing their assembly. The resulting aggregates gradually disassemble as the surfactant concentration throughout the solution equilibrates. The lifetimes of the out-of-equilibrium aggregates depend on and can be controlled by the size of the constituent nanoparticles. We demonstrate the utility of our out-of-equilibrium aggregates to form transient reflective coatings on polar surfaces.