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arXiv 1503.05015physics.chem-ph
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受限条件下的不相容液体

Incompatible Liquids in Confined Conditions

Krisztina László, Bruno Demé, Orsolya Czakkel, Erik Geissler

摘要:

在涉及有机蒸气的应用中,高表面积碳的性能经常受到大气中水蒸气的挑战。小角中子散射(SANS),通过它的能力,区分不同的组件之间的对比度变化的手段,是理想的适合于调查的行为吸附层同时接触的混合汽相。即使在高相对湿度(RH)下,水单独在用于这些研究的氧化的微孔碳的表面上形成由簇组成的不连续膜。当甲苯也存在时,所有可用的碳表面都被润湿。甲苯和水在RH 11.5%时已经作为单相吸附,并且存在于吸附相中的水的浓度高达2.9重量%,远高于其在本体甲苯中的溶解度(0.033重量%在25 ℃下)。在RH 87%时,吸附相中的水浓度高四倍,约为12重量%。最近提出的芳香分子锚定水的机制可以解释这种现象。

英文摘要:

In applications involving organic vapour, the performance of high surface area carbons is often challenged by water vapour in the atmosphere. Small angle neutron scattering (SANS), through its ability to distinguish between different components by means of contrast variation, is ideally suited to investigating the behaviour of adsorbed layers in simultaneous contact with a mixed vapour phase. Even at high relative humidity (RH), water alone forms a discontinuous film composed of clusters on the surface of the oxidized microporous carbon used for these studies. When toluene is also present, all the available carbon surface is wetted. Toluene and water adsorb as a single phase already at RH 11.5%, and the concentration of water present in the adsorbed phase is as high as 2.9 wt.%, far above its solubility in bulk toluene (0.033 wt.% at 25 deg C). At RH 87% the concentration of water in the adsorbed phase is four times higher, approximately 12 wt.%. The recently proposed mechanism of anchoring of the water by the aromatic molecules may provide an explanation for this phenomenon.

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