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首页> 外文期刊>Fuel >Bi-fractal and bi-Gaussian theories to evaluate impact of polythiophene-coated Fe_3O_4 nanoparticles on asphaltene precipitation and surface topography
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Bi-fractal and bi-Gaussian theories to evaluate impact of polythiophene-coated Fe_3O_4 nanoparticles on asphaltene precipitation and surface topography

机译：用双分形和双高斯理论评估聚噻吩包覆的Fe_3O_4纳米颗粒对沥青质沉淀和表面形貌的影响

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摘要

Use of nanoparticles can effectively inhibit asphaltene precipitation. The present study aims to explore the role of polythiophene-coated Fe3O4 nanoparticles in both asphaltene precipitation and surface topography alteration. Topography information of the surface is obtained through employing atomic force microscopy (AFM) imaging technique. Fractal theory, Gaussian theory, and statistical parameters (e.g., skewness and kurtosis parameters) are used to analyze the surface topography in the presence and absence of nanoparticles. The mono-fractal theory does not adequately describe the irregularity of the surface. Thus, the bi-fractal approach is utilized for investigating the topography alteration of the glass substrate as a result of asphaltene precipitation in the presence and absence of nanoparticles in both light and heavy oil samples. In this theory, the asperity of the surface is divided into two categories: micro- and macro-asperity; the fractal dimensions are calculated for each surface separately. Also, this work employs the bi-Gaussian theory for the first time to study characteristics of a surface that consists of summits. The results of the bi-Gaussian theory are in acceptable agreement with those obtained using the bi-fractal theory. It is found that nanoparticles greatly affect the surface topography. The results also confirm that asphaltene can be adsorbed more on nanoparticles in heavy synthetic oil, compared to light synthetic oil. The fractal theory is more accurate than the bi-Gaussian and statistical approaches as the fractal theory considers all scales/dimensions while other methods take into account only the height of asperity. According to the modeling results, the nanoparticles have potential to considerably lower asphaltene precipitation. This study can provide useful guidelines/tips for inhibiting the wettability alteration of the surface upon asphaltene precipitation over production and transportation processes while using nanoparticles.
机译：使用纳米颗粒可以有效地抑制沥青质的沉淀。本研究旨在探讨聚噻吩包覆的Fe3O4纳米颗粒在沥青质沉淀和表面形貌变化中的作用。通过使用原子力显微镜（AFM）成像技术获得表面的形貌信息。分形理论，高斯理论和统计参数（例如偏度和峰度参数）用于分析存在和不存在纳米粒子的表面形貌。单分形理论不能充分描述表面的不规则性。因此，在轻油和重油样品中均存在和不存在纳米颗粒的情况下，利用双分形方法研究了由于沥青质沉淀而导致的玻璃基板的形貌变化。在该理论中，表面的粗糙分为两类：微观粗糙和宏观粗糙。分形维数是分别为每个表面计算的。此外，这项工作首次采用双高斯理论来研究由峰顶组成的表面的特征。双高斯理论的结果与使用双分形理论获得的结果是可以接受的。发现纳米颗粒极大地影响了表面形貌。该结果还证实，与轻质合成油相比，重质合成油中的沥青质可以更多地吸附在纳米颗粒上。分形理论比双向高斯和统计方法更准确，因为分形理论考虑了所有尺度/维度，而其他方法仅考虑了粗糙的高度。根据建模结果，纳米粒子具有显着降低沥青质沉淀的潜力。这项研究可以提供有用的指导/技巧，以在使用纳米颗粒的过程中抑制沥青质在生产和运输过程中发生沉淀时表面的润湿性变化。

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  • 来源
    《Fuel》 |2020年第jul15期|117535.1-117535.13|共13页
  • 作者

  • 作者单位

    Univ Guilan Dept Chem Engn Rasht Iran|Mem Univ Fac Engn & Appl Sci St John NF Canada;

    Univ Guilan Dept Chem Engn Rasht Iran;

    Mem Univ Fac Engn & Appl Sci St John NF Canada;

    Univ Wyoming Coll Engn & Appl Sci Dept Petr Engn 1000 E Univ Ave Laramie WY 82071 USA;

    Kuwait Univ Coll Engn & Petr Dept Petr Engn Kuwait Kuwait;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Nanoparticles; Bi-fractal; Bi-Gaussian; Statistical parameters; Atomic force microscopy; Topography alteration;

    机译：纳米颗粒;双分形双高斯统计参数;原子力显微镜;地形变化;

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