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arXiv 2012.11562cond-mat.softcond-mat.stat-mech
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具有可控润湿特性的油水分离建模

Modeling oil-water separation with controlled wetting properties

Cristina Gavazzoni, Marion Silvestrini, Carolina Brito

AI总结:

针对油水分离理论不足,本文提出预测基底润湿特性的理论模型,并用4-spins cellular Potts模型模拟支柱与多孔储层基底的分离效率。

摘要:

人们已经提出了若干油水分离技术,以提高净水能力。随着制备具有对立润湿行为材料的技术成为可能,例如一种排斥水并吸收油的基底,对控制这种选择性能力的性质的理解不断加深,目标是将其用作分离混合液体的机制。除了该领域的实验进展之外,人们从理论方面获得的认识仍然较少。在本工作中,我们提出了一个理论模型来预测给定基底的润湿特性,并引入使用4-spins cellular Potts模型的模拟,以研究其将水与油分离的效率。我们的结果表明,基底的效率既取决于液体之间的相互作用,也取决于基底自身的润湿行为。由两种液体组成的液滴的水行为大致由基底的疏水性控制。然而,预测油的行为更为复杂,因为基底具有亲油性并不能保证液滴中存在的全部油量都会被基底吸收。对于本工作考虑的两类基底——带支柱的基底和带有储层的多孔基底——液滴中总会存在一定量的残余油,由于油与水和气体的相互作用,这部分油不会被基底吸收。理论模型和数值模型都可以方便地修改,以分析其他类型的基底和液体。

英文摘要:

Several oil-water separation techniques have been proposed to improve the capacity of cleaning water. With the technological possibility of producing materials with antagonist wetting behavior, as for example a substrate that repeal water and absorb oil, the understanding of the properties that control this selective capacity has increased with the goal of being used as mechanism to separate mixed liquids. Besides the experimental advance in this field, less is known from the theoretical side. In this work we propose a theoretical model to predict the wetting properties of a given substrate and introduce simulations with a 4-spins cellular Potts model to study its efficiency in separating water from oil. Our results show that the efficiency of the substrates depends both on the interaction between the liquids and on the wetting behavior of the substrates itself. The water behavior of the droplet composed of both liquids is roughly controlled by the hidrophobicity of the substrate. To predict the oil behavior, however, is more complex because the substrate being oleophilic do not guarantee that the total amount of oil present on the droplet will be absorbed by the substrate. For both types of substrates considered is this work, pillared and porous with a reservoir, there is always an amount of reminiscent oil on the droplet which is not absorbed by the substrate due to the interaction with the water and the gas. Both theoretical and numerical models can be easily modified to analyse other types of substrates and liquids.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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