论文标题
直接观察纳米孔的均质气氮
Direct observation of homogeneous cavitation in nanopores
论文作者
论文摘要
我们报告了从多孔氧化铝和硅膜中蒸发己烷的蒸发。这些膜中包含数十亿个针对墨水形状的独立纳米孔，那里的腔体通过收缩将直径几十纳米的直径与散装蒸气分离。对于足够狭窄收缩的氧化铝膜，我们证明了腔蒸发是通过气腔进行的。空化率的压力依赖性的测量遵循大量，同质，古典成核理论的预测，并确定确定均质气蚀作为中孔材料中蒸发机制的相关性。我们的结果表明，多孔氧化铝膜是一个有前途的新系统，可以在深层亚稳态的状态下研究液体。
We report on the evaporation of hexane from porous alumina and silicon membranes. These membranes contain billions of independent nanopores tailored to an ink-bottle shape, where a cavity several tens of nanometers in diameter is separated from the bulk vapor by a constriction. For alumina membranes with narrow enough constrictions, we demonstrate that cavity evaporation proceeds by cavitation. Measurements of the pressure dependence of the cavitation rate follow the predictions of the bulk, homogeneous, classical nucleation theory, definitively establishing the relevance of homogeneous cavitation as an evaporation mechanism in mesoporous materials. Our results imply that porous alumina membranes are a promising new system to study liquids in a deeply metastable state.
