Study on the Interactive Effects of Solid Particles and Asphaltenes on the Interfacial Structure and Stability of a Water-in-Model Oil Emulsion,Langmuir

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Study on the Interactive Effects of Solid Particles and Asphaltenes on the Interfacial Structure and Stability of a Water-in-Model Oil Emulsion
Langmuir ( IF 3.7 ) Pub Date : 2021-08-31 , DOI: 10.1021/acs.langmuir.1c01753
Daiwei Liu ₁ , Hao Zhang ₁ , Chuanxian Li _{1,

2} , Huihui Zhang ₁ , Fei Yang _{1,

2} , Guangyu Sun _{1,

2} , Yansong Zhao ₃

Affiliation

Asphaltenes and solid particles are common compositions in crude oil emulsions. They can be anchored at the oil/water interface, exerting significant effects on the strength of an interfacial layer. In this study, the interactive effects of the asphaltenes and solid particles on the interfacial structure are investigated. First, the solid particles and asphaltenes are proven to perform different roles in stabilizing the emulsion by influencing the strength of the interfacial layer with the change in asphaltene concentration. Subsequently, the competitive coadsorption process of the asphaltenes and particles is examined by measuring the dynamic interfacial tension. The adsorption of particles could occupy the interfacial area, postponing the adsorption of asphaltenes. The crumpling ratio of the interfacial layer formed by the asphaltenes and solid particles indicates that the composite layer should be more flexible with a higher compressibility compared to that formed by only asphaltenes. It is observed by SEM that the binary layer possesses a composite structure with the particles as the framework and the asphaltenes as the filling. The interactive mechanism between the asphaltenes and particles should lie in the adsorption of the asphaltenes on the particles. Systematic experiments on the contact angle, adsorbed amount, and desorption percentage reveal that asphaltenes could adsorb on the surface of the particles, modifying the wettability. The change in asphaltene concentration will result in the varying wettability modification due to asphaltene adsorption on the particles, leading to the different adsorption abilities and barrier effects of the modified particles at the interface.

中文翻译：

固体颗粒与沥青质相互作用对水包模型油乳界面结构和稳定性的研究

沥青质和固体颗粒是原油乳液中的常见成分。它们可以锚定在油/水界面，对界面层的强度产生显着影响。在这项研究中，研究了沥青质和固体颗粒对界面结构的相互作用。首先，已证明固体颗粒和沥青质通过随着沥青质浓度的变化影响界面层的强度而在稳定乳液方面发挥不同的作用。随后，通过测量动态界面张力来检查沥青质和颗粒的竞争性共吸附过程。颗粒的吸附会占据界面区域，推迟沥青质的吸附。由沥青质和固体颗粒形成的界面层的起皱比表明，与仅由沥青质形成的复合层相比，复合层应具有更高的柔韧性和更高的可压缩性。通过扫描电镜观察，二元层具有以颗粒为骨架、沥青质为填料的复合结构。沥青质与颗粒相互作用的机理应该在于沥青质对颗粒的吸附。对接触角、吸附量和解吸百分比的系统实验表明，沥青质可以吸附在颗粒表面，改变润湿性。由于沥青质吸附在颗粒上，沥青质浓度的变化将导致不同的润湿性改性，

更新日期：2021-09-14

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