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Influence of carbon quantum dots on the viscosity reduction of polyacrylamide solution

机译：碳量子点对聚丙烯酰胺溶液粘度降低的影响

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摘要

Viscosity is one of the key factors which influence the application of polyacrylamide (PAM) in enhanced oil recovery (EOR). In this study, we have demonstrated the viscosity reduction of PAM solution by using carbon quantum dots (CQDs) through rheological, spectroscopic and thermal analyses. The stability of PAM, CQDs, and PAM/CQDs composites, and the chemical interactions between PAM and CQDs were investigated. The addition of CQDs into PAM solution decreased its viscosity, demonstrating a phenomenon which contradicts the expression normally derived from the Einstein-Batchelor law for the viscosity of particle suspensions. Consequently, the elastic properties of PAM/CQDs composites were lower than those of the pure PAM solutions. Moreover, the presence of CQDs in the PAM increased its flow activation energy and decreased its yield point, leading to an increased sensitivity to both temperature and shear rate. The mechanism behind the reduced viscosity behaviour of PAM/CQDs composites appears to be the formation of free radicals and the elimination of ammonia molecules, leading to the deterioration of the polymer backbone.
机译：粘度是影响聚丙烯酰胺（PAM）在增强的溢油（EOR）中的应用的关键因素之一。在这项研究中，我们通过流变，光谱和热分析证明了通过使用碳量子点（CQDS）的PAM溶液的粘度降低。研究了PAM，CQDS和PAM / CQDS复合材料的稳定性，以及PAM和CQDS之间的化学相互作用。将CQD添加到PAM溶液中降低了其粘度，证明了一种与通常衍生自Einstein-Batchelor法的表达相矛盾的现象，用于颗粒悬浮液的粘度。因此，PAM / CQDS复合材料的弹性性质低于纯PAM溶液的弹性性质。此外，PAM中CQD的存在提高了其流动激活能量并降低了其屈服点，导致对两种温度和剪切速率的敏感性增加。 PAM / CQDS复合材料的降低粘度行为背后的机制似乎是自由基的形成和消除氨分子，导致聚合物主链的劣化。

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  • 来源
    《Fuel》 |2019年第jul15期|205-214|共10页
  • 作者

    Haruna Maje Alhaji; Hu Zhongliang; Gao Hui; Gardy Jabbar; Magami Saminu Musa; Wen Dongsheng;

  • 作者单位

    Univ Leeds Sch Chem & Proc Engn Leeds LS2 9JT W Yorkshire England;

    Univ Leeds Sch Chem & Proc Engn Leeds LS2 9JT W Yorkshire England;

    Univ Leeds Sch Chem & Proc Engn Leeds LS2 9JT W Yorkshire England;

    Univ Leeds Sch Chem & Proc Engn Leeds LS2 9JT W Yorkshire England;

    17 Whinchat Ave Newton Le Willows Merseyside England;

    Univ Leeds Sch Chem & Proc Engn Leeds LS2 9JT W Yorkshire England|Beihang Univ Sch Aeronaut Sci & Engn Beijing 100191 Peoples R China;

  • 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

    Rheology; Reduced viscosity; Polyacrylamide; Carbon quantum dots; Viscoelasticity;

    机译：流变学;降低粘度;聚丙烯酰胺;碳量子点;粘弹性;

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