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Zhang W, Fan S, Li G, Wang Y, Lang X. Multifunctional Amphiphobic Coating toward Ultralow Interfacial Adhesion of Hydrates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:4082-4090. [PMID: 36880180 DOI: 10.1021/acs.langmuir.2c03440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Hydrate adhesion is a challenging issue in some practical applications. However, most current anti-hydrate coatings fail to maintain their properties when subject to crude oil and corrosive contaminants. In addition, the effect of surface properties on the nucleation of hydrates is still unexplored from a microscopic perspective. In this study, a multifunctional amphiphobic PF/ZSM-5 coating consisting of 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane modified ZSM-5 zeolite (F/ZSM-5) and adhesive polyethersulfone was fabricated by the spraying method. The interfacial nucleation and adhesion of hydrates on substrates were studied from a microscopic perspective. The coating exhibited excellent repellencies to various liquids, including water, edible oil, liquid paraffin, vacuum pump oil, n-hexadecane, and crude oil. The tetrabutylammonium bromide (TBAB) hydrate is readily nucleated on the bare Cu surface. In contrast, the coated substrate effectively inhibited the hydrate nucleation on the surface and even reduced the adhesion force to 0 mN/m. Furthermore, this coating was fouling- and corrosion-resistant and can maintain an ultralow hydrate adhesion force even after immersion in crude oil or TBAB solution for 20 and 300 d, respectively. The durable anti-hydrate performance of the coating was attributed mainly to the unique architecture and excellent amphiphobic properties enabling stable air cushions between the solid-liquid interface.
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Affiliation(s)
- Wenjuan Zhang
- Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Shuanshi Fan
- Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Gang Li
- Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Yanhong Wang
- Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
- Guangdong Engineering Technology Research Center of Advanced Insulating Coating, Zhuhai 519175, China
| | - Xuemei Lang
- Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
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Lei Y, Li S, Liu X, Wang H, Zhu H, Gao Y, Peng H, Yu P. Effect of existence state of asphaltenes on microstructure of wax crystals: Fractal dimension and unit cell structure. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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Dong H, Ma R, Zhao J, Xi X, Wang Z. Application of Rheo-optic In Situ Measurement Technology to Study Waxy Crude Oil Rheology. ACS OMEGA 2022; 7:17948-17962. [PMID: 35664571 PMCID: PMC9161395 DOI: 10.1021/acsomega.2c01251] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Accepted: 05/04/2022] [Indexed: 06/15/2023]
Abstract
The micromechanism of waxy crude oil gelling is the interaction between wax crystals to form a certain intensity flocculation structure, which significantly increases the cost of production and transmission. In this paper, rheo-optic in situ measurement technology is applied to the rheological study of waxy crude oil for the first time and also to the rheological response of typical waxy crude oil to thermal history, the micromechanism of shear-thinning, and the dynamic behavior of wax crystal. Through the new experimental technique and analysis method, it is found that two types of wax crystals can be formed under certain thermal historical conditions, which have opposite performances in microscopic morphology, mechanic properties, and flocculation tendency, and the change of its proportion in crude oil is the root cause of the initial cooling temperature affecting the fluency of waxed crude oil. It was found that the microscopic behavior of waxy crude oil with the increase of shear rate went through the following whole process: the waxy crude oil system changes from static to dynamic, the wax crystal flocculation network undergoes deformation, cracks, and ruptures, and wax crystal aggregates break, small aggregates orient along the flow field, and small aggregates continues to deform and break. When the shear rate is below 5 s-1, the crack of the flocculation structure plays a leading role. It is only after the shear rate exceeds 5 s-1 that the deformation of the wax crystal and its flocs begins to function. Furthermore, according to the microscopic images of the wax crystals motion sequence, the micromorphology of different types of flocs and the dynamic behaviors under shearing are systematically analyzed by dynamic micro-object capture technology.
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Affiliation(s)
- Hang Dong
- Northeast
Petroleum University, 163000, Daqing, Hei Longjiang, China
- Young
and Middle-aged Innovation Team of Northeast Petroleum University, 163000, Daqing, Hei Longjiang, China
| | - RunZe Ma
- Northeast
Petroleum University, 163000, Daqing, Hei Longjiang, China
| | - Jian Zhao
- Northeast
Petroleum University, 163000, Daqing, Hei Longjiang, China
- Young
and Middle-aged Innovation Team of Northeast Petroleum University, 163000, Daqing, Hei Longjiang, China
| | - Xiangrui Xi
- Northeast
Petroleum University, 163000, Daqing, Hei Longjiang, China
- Young
and Middle-aged Innovation Team of Northeast Petroleum University, 163000, Daqing, Hei Longjiang, China
| | - Zhihua Wang
- Northeast
Petroleum University, 163000, Daqing, Hei Longjiang, China
- Young
and Middle-aged Innovation Team of Northeast Petroleum University, 163000, Daqing, Hei Longjiang, China
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