论文标题
粘度介导的表面纳米圆形的生长和合并
Viscosity-Mediated Growth and Coalescence of Surface Nanodroplets
论文作者
论文摘要
溶剂交换是一种简单的方法，可以通过通过较差的溶剂将良好的溶剂，差溶剂和油（溶液A）取代溶液来在底物上产生表面纳米型。在这项工作中，我们表明，均匀表面上纳米光的生长和结合是由溶剂的粘度介导的。我们表明，在粘性溶液B的高流速下，最终的液滴体积与比例定律偏离了将最终液滴体积与非粘液溶液B的流速相关联，在先前的工作中报道。我们将这种偏差归因于粘性溶液B中的两极分子增长，在粘性溶液B中，从初始快速制度转变为受流量影响的最终慢速政权。此外，粘性溶液B阻碍了生长的液滴的合并，从而导致液滴大小的双峰分布具有稳定的纳米光，与在非粘性情况下的液滴的连续大小分布相反。我们证明，在高粘度环境中产生的小液滴可以用于增强荧光检测，并具有更高的灵敏度和较短的响应时间。这项工作的发现可能有可能应用于介导没有模板的同质表面上表面纳米圆形的尺寸分布。
Solvent exchange is a simple method to produce surface nanodroplets on a substrate for a wide range of applications by displacing a solution of good solvent, poor solvent and oil (Solution A) by a poor solvent (Solution B). In this work, we show that the growth and coalescence of nanodroplets on a homogeneous surface is mediated by the viscosity of the solvent. We show that at high flow rates of viscous Solution B, the final droplet volume deviates from the scaling law that correlates final droplet volume to the flow rate of non-viscous Solution B, reported in previous work. We attribute this deviation to a two-regime growth in viscous Solution B, where transition from an initial, fast regime to a final slow regime influenced by the flow rate. Moreover, viscous solution B hinders the coalescence of growing droplets, leading to a distinct bimodal distribution of droplet size with stable nanodroplets, in contrast to a continuous size distribution of droplets in non-viscous case. We demonstrate that the group of small droplets produced in high viscosity environment may be applied for enhanced fluorescence detection with higher sensitivity and shorter response time. The finding of this work can potentially be applied for mediating the size distribution of surface nanodroplets on homogeneous surface without templates.
