Lilypad aggregation: localised self-assembly and metal sequestration at a liquid–vapour interface,Chemical Science

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Lilypad aggregation: localised self-assembly and metal sequestration at a liquid–vapour interface
Chemical Science ( IF 7.6 ) Pub Date : 2020-07-07 , DOI: 10.1039/d0sc02190c
Christopher D Jones ₁ , Aled R Lewis ₂ , Daniel R Jones ₂ , Christopher J Ottley ₁ , Kaiqiang Liu ₃ , Jonathan W Steed ₁

Affiliation

Spatially resolved soft materials, such as vesicles and microgels, have shown promise as selective adsorbents and microscale reaction vessels. However, spatiotemporal control of aggregation can be difficult to achieve. In this study, nickel(II) chloride and a dipyridyl oligo(urea) ligand were combined in a vapour-diffusion setup to produce a localised spheroidal aggregate at the liquid–vapour interface. This aggregate forms via the self-assembly and fusion of monodisperse colloids and grows until its weight is no longer counterbalanced by surface tension. A simple physical model reveals that this process, termed lilypad aggregation, is possible only for surface energies that favour neither bulk aggregation nor the growth of an interfacial film. These surface energies dictate the final size and shape of the aggregate and may be estimated through visual monitoring of its changing morphology. Lilypad aggregates sequester metal from the surrounding sol and can be collected manually from the surface of the liquid.

中文翻译：

Lilypad聚集：液-气界面的局部自组装和金属封存

空间分辨的软材料，例如囊泡和微凝胶，已显示出作为选择性吸附剂和微型反应容器的前景。然而，聚合的时空控制可能很难实现。在这项研究中，氯化镍（ II ）和联吡啶低聚（尿素）配体在蒸气扩散装置中结合，在液-气界面产生局部球状聚集体。这种聚集体通过单分散胶体的自组装和融合形成，并不断增长，直到其重量不再被表面张力所平衡。一个简单的物理模型表明，这个被称为睡莲聚集的过程只有在表面能既不利于整体聚集也不利于界面膜生长的情况下才可能发生。这些表面能决定了聚集体的最终尺寸和形状，并且可以通过目视监测其变化的形态来估计。 Lilypad 聚集了周围溶胶中的金属螯合剂，并且可以从液体表面手动收集。

更新日期：2020-07-22

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