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Formation of crystalline ring patterns on extremely hydrophobic supersmooth substrates: Extension of ring formation paradigms

机译：在极其疏水的超光滑基材上形成结晶环图案：环形成范例的扩展

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摘要

The mechanism by which nanoparticles suspended in liquids self-organize on substrates to ring patterns has attracted much attention, because of a large body of possible practicable applications. Recent work demonstrated that, for example, gravity affects ring geometry, showing that the mechanism of ring formation is indeed not fully understood. Current models suppose that the pinning of the contact line between drops and substrates is a prerequisite for ring formation and that the process is induced either by surface irregularities of the substrate itself, or by self-pinning, triggered by the attachment of suspended material to the substrate. The latter mode was illustrated for drops of aqueous suspensions, evaporating on atomically flat hydrophilic substrates, e.g., freshly cleaved mica. Conversely, the crucial role of pinning on ring formation was derived from the observation that no rings were formed on smooth Teflon. Here WE! provide the first experimental evidence of the formation of rings on supersmooth hydrophobic surfaces lacking the known conditions required for particle immobilization. Results are suitable to extend existing models and are expected to be instrumental in the predictable design of cell-integrative crystalline ring patterns on biomaterial surfaces and the production of symmetrical ring patterns in proteomics, where the rings are particularly useful to study interaction scenarios between competing proteins.
机译：由于大量可能的实际应用，悬浮在液体中的纳米颗粒在基体上自组织成环状的机理引起了广泛的关注。最近的工作表明，例如重力会影响环的几何形状，这表明确实没有完全理解环的形成机理。当前的模型假设液滴与基材之间的接触线的钉扎是形成环的前提，并且该过程是由基材本身的表面不规则性引起的，或者是由悬浮材料附着到基材上而触发的自钉扎引起的基质。对于水悬浮液的液滴，在原子平坦的亲水性基质例如新鲜裂解的云母上蒸发，示出了后一种模式。相反，钉扎在环形成上的关键作用源自观察到在光滑的特氟隆上没有环形成。在这里，我们！提供了在超光滑疏水表面上形成环的第一个实验证据，该环缺乏固定颗粒所需的已知条件。结果适用于扩展现有模型，并有望在生物材料表面上的细胞整合性结晶环图样的可预测设计以及蛋白质组学中对称环图样的产生中发挥作用，其中环图对于研究竞争性蛋白质之间的相互作用情况特别有用。

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