纳米孔中均匀空化的直接观察
Direct observation of homogeneous cavitation in nanopores
摘要：
我们报告的己烷从多孔氧化铝和硅膜的蒸发。这些膜包含数十亿个独立的纳米孔，这些纳米孔被定制为墨水瓶形状，其中直径为几十纳米的空腔通过收缩与大量蒸汽分离。对于足够窄的收缩氧化铝膜，我们证明了空腔蒸发进行空化。空化率的压力依赖性的测量遵循的散装，均匀的，经典的成核理论的预测，明确地建立均匀空化的相关性作为蒸发机制在介孔材料。我们的研究结果表明，多孔氧化铝膜是一个很有前途的新系统，以研究液体在一个深亚稳态。
英文摘要：
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.
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