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首页> 外文期刊>Water resources research >Characterization of the surface properties of epoxy-type models used for multiphase flow studies in fractured media and creation of a new model
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Characterization of the surface properties of epoxy-type models used for multiphase flow studies in fractured media and creation of a new model

机译：表征裂缝性介质中多相流的环氧型模型的表面特性和建立新模型

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Epoxy models have been used as analogs for fractured rock surfaces in many laboratory investigations of multiphase flow processes. However, there is no agreement on how well or poorly such an analog replicates the surface chemistry of geologic materials, nor is there a satisfactory analysis of the surface properties of epoxy. This paper addresses the issue of accurately characterizing the surface chemistry of a typical epoxy used in laboratory multiphase flow studies and comparing that surface to a polystyrene surface and a radio frequency glow discharge treated polystyrene surface. Surface properties were determined using direct contact angle measurements of polar and apolar liquids on flat test samples. The epoxy was determined to have surface properties as follows: γ = 62.3, γ~(LW) = 39, γ~(AB) = 23.3, γ~⊕ = 0, and γ~direct- = 23.3 mJ/m~2, where γ is the total surface tension of the solid, γ~(LW) is the Lifshitz-van der Waals (LW) surface tension component, γ~(AB) is the Lewis acid base (AB) surface tension component, γ~direct- is the electron-donor (negative) parameter, and γ~⊕ is the electron-acceptor (positive) parameter. Values of γ~direct- < 27.9 mJ/m~2 indicate a hydrophobic surface, which means that epoxy is not a good analog for most geologic materials. This study also explores the use of radio frequency glow discharge plasma to add hydroxyl functionality to polymer surfaces producing a material with alterable surface properties and the same optical and casting properties as epoxy. Using this method, the degree of alteration of the surface chemistry of polymer fracture models can be controlled, allowing the creation of models with a variety of different wettabilities. The resultant models were found to be durable, long lasting, and a potentially very useful alternative to the more typical epoxy models.
机译：在许多多相流过程的实验室研究中，环氧树脂模型已被用作破裂岩石表面的类似物。但是，关于这种类似物复制地质材料的表面化学效果的好坏程度，尚无共识，也没有对环氧树脂的表面性质进行令人满意的分析。本文探讨了准确表征实验室多相流研究中使用的典型环氧树脂的表面化学性质，并将该表面与聚苯乙烯表面以及经射频辉光放电处理的聚苯乙烯表面进行比较的问题。使用在平坦测试样品上极性和非极性液体的直接接触角测量来确定表面性能。确定该环氧树脂具有如下表面性能：γ= 62.3，γ〜（LW）= 39，γ〜（AB）= 23.3，γ〜⊕= 0，并且γ〜direct- = 23.3 mJ / m〜2，其中γ是固体的总表面张力，γ〜（LW）是Lifshitz-van der Waals（LW）表面张力分量，γ〜（AB）是路易斯酸碱（AB）表面张力分量，γ〜direct -是电子给体（负）参数，而γ〜⊕是电子受体（正）参数。 γ_direct-<27.9 mJ / m〜2的值表示疏水表面，这意味着对于大多数地质材料而言，环氧不是很好的类似物。这项研究还探索了使用射频辉光放电等离子体为聚合物表面增加羟基官能度，从而生产出具有可变表面性质以及与环氧树脂相同的光学和铸造性质的材料。使用这种方法，可以控制聚合物断裂模型表面化学变化的程度，从而可以创建具有多种不同润湿性的模型。发现所得模型是耐用的，持久的，并且是更典型的环氧模型的潜在非常有用的替代品。

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