Layering in water adsorption and desorption on porous Vycor observed by dielectric measurements

Layering in water adsorption and desorption on porous Vycor observed by dielectric measurements
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通过介电测量观察多孔 Vycor 上水吸附和解吸的分层

DOI:
10.1103/physrevb.76.155437
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发表时间:
2007-10
期刊:
影响因子:
3.7
通讯作者:
Niu, XJ
Niu, XJ
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Wang, Q;Li, CX;Sun, G;Wang, LW;Lu, KQ;Niu, XJ

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在室温下使用介电谱系统地检测了多孔 Vycor 上的水吸附和解吸。观察到两个弛豫峰,一个针对地表水(峰 1),另一个针对地表水以下的水(峰 2)。数据定量分析表明,峰2的介电弛豫强度呈明显阶梯状变化,表明水分子逐层吸附和解吸。这些实验结果支持了延迟弯月面理论,以解决长期争论的吸附机制问题。
Water adsorption and desorption on porous Vycor were systematically examined by using dielectric spectroscopy at room temperature. Two relaxation peaks were observed, one for surface water (peak 1) and the other water beneath the surface water (peak 2). Quantitative analysis of the data demonstrated that the dielectric relaxation strength of peak 2 varies in an obviously stepwise way, indicating that water molecules were adsorbed and desorbed layer by layer. These experimental results supported the delayed meniscus theory for the long-debated issue of the mechanism of adsorption.
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