论文标题
浓缩聚合物溶液的蒸发对相对湿度不敏感
The evaporation of concentrated polymer solutions is insensitive to relative humidity
论文作者
论文摘要
最近的理论表明，由于空气溶液界面处的溶质的“极化层”，大分子溶液的蒸发动力学对环境相对湿度（RH）不敏感。我们在开放式毛细血管中蒸发聚乙烯醇溶液中的这种不敏感性高达80％。为了解释在较高RH处观察到的蒸发率下降，我们需要调用由于界面聚合物胶凝引起的压缩应力。此外，与理论预测的更早的RH不敏感蒸发设置，这表明胶凝“皮肤”具有进一步的作用。我们讨论了这些观察结果对通过气溶胶传播的呼吸道病毒的相关性。
A recent theory suggests that the evaporation kinetics of macromolecular solutions is insensitive to the ambient relative humidity (RH) due to the formation of a `polarisation layer' of solutes at the air-solution interface. We confirm this insensitivity up to RH~80% in the evaporation of polyvinyl alcohol solutions from open-ended capillaries. To explain the observed drop in evaporation rate at higher RH, we need to invoke compressive stresses due to interfacial polymer gelation. Moreover, RH-insensitive evaporation sets in earlier than theory predicts, suggesting a further role for a gelled `skin'. We discuss the relevance of these observations for respiratory virus transmission via aerosols.
