AFM measurement of roughness, adhesive force and wettability in various rank coal samples from Qinshui and Junggar basin, China

Lu, Yuejian; Liu, Dameng; Cai, Yidong; Gao, Changjing; Jia, Qifeng; Zhou, Yingfang

doi:10.1016/j.fuel.2022.123556

Cited by 31 publications

(38 citation statements)

References 61 publications

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“…The water/gas relative permeability and water saturation curves shown in Figure reveal that water/gas relative permeability increases gradually with the increase in the contact angle. There are stronger intermolecular forces between the water molecule and solid as the porous medium become more hydrophilic, which results in a larger slip length and smaller viscosity for fluid flow , and wreaked the water flow capacity. By comparison to pervious results based on the experiment, the effect of wettability on gas relative permeability has similar trends; however, the water relative permeability curve is different under different wettabilities.…”

Section: Results and Discussionmentioning

confidence: 99%

Novel Discrete Fracture Network Model for Multiphase Flow in Coal

Liu

Cai

et al. 2023

Energy Fuels

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Multiphase flow intensely affects the movement and accumulation of other fluids in coal and plays an essential role in predicting the permeability of coal during coalbed methane (CBM) production. Fractures have played a decisive role in the transport of CBM after hydraulic fracturing has occurred. In this study, a multiscale pore network model (PNM) was constructed on the basis of focused ion beam scanning electron microscopy (FIB-SEM) image results. Additionally, a novel discrete fracture network model, fracture–pore network model (F–PNM), was proposed to investigate the effect of fracture density, fracture developing direction, and wettability on multiphase flow. The results reveal that the permeability of F–PNM increases with the increase of the fracture density, which could be the result of the predominance of snap off. The permeability decreases as the angle between the fracture and flow direction increases; initially, the permeability decreases steeply and then it tends to remain stable; and for angles between 0° and 15°, the permeability decreased by as much as 61.8%. Moreover, the wettability of coal has limited impact on its water relative permeability; however, it has a measurable effect on gas relative permeability, which could be owing to water accumulation on the coal surface under different wettability conditions. A good wetting performance would have a negative effect on the CBM production and reduce flowback efficiency.

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Section: Results and Discussionmentioning

confidence: 99%

Novel Discrete Fracture Network Model for Multiphase Flow in Coal

Liu

Cai

et al. 2023

Energy Fuels

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“…Wettability, which is one of the important properties of a solid surface, is closely related to the geometry, chemical composition and roughness of the solid surface [39]. Particularly, nano-sized roughnesses are critical to obtain samples with high contact angles.…”

Section: Surface Topography and Average Roughness Valuesmentioning

confidence: 99%

Preparation of superhydrophobic coating with excellent abrasion resistance and anti-icing properties using Al2O3/PVDF composites with different Al2O3 particle sizes

Samsun

Alkan

Basaran

et al. 2023

Preprint

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Considering the application areas of ceramic materials (ceramic sinks, toilet bowls, washing areas, ceramic tiles tableware), the demand for improving dirt and water repellent properties is increasing day by day with the perception of hygiene and cleanliness that affects the whole world. In this study, super-hydrophobic solutions were prepared and applied to ceramic substrates by adding alumina particles with different particle size distributions into the polyvinylidene fluoride (PVDF) matrix. Alumina powders added to the PVDF matrix at four different rates to obtain composite materails. Alumina powders with two different particle sizes, coarse and fine, was used and the effect of grain size on the properties was investigated. The adhesion performance of the coatings was determined by brush tests. In addition, surface roughness values, colour variation after coating, and anti-icing performance were also evaluated. It was observed that the coating with the (PVDF:Al2O3) ratio (1:0.25) had the highest contact angle and adhesion property.

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“…Compared with the thin-layer wicking method, AFM has critical significance because it involves direct measurements (Lu et al, 2022).…”

Section: Wettabilitymentioning

confidence: 99%

“…These results are smaller than those calculated by the Washburn equation in the thin‐layer wicking method (Karagüzel et al, 2005). Compared with the thin‐layer wicking method, AFM has critical significance because it involves direct measurements (Lu et al, 2022).…”

Section: Afm Applications With Source Rocksmentioning

confidence: 99%

Nanoscale physical parameters of source rocks identified by atomic force microscopy: A review

et al. 2022

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The refinement of nanoscale physical parameters of source rocks has benefitted from continuous innovations in technology and methods. Traditional methods for detecting reservoir physical properties are limited by the properties of the instruments. Atomic force microscopy (AFM) provides new methods and approaches for furthering our understanding and exploring the nanoscale world. Its wide range of applications and gradually developed multiscenario application modes make it an ideal tool for the characterization of nanoscale physical properties of source rocks (coal, shale, mudstone, sandstone, etc.). We highlight the advantages of AFM in regard to performing nondestructive 3D imaging and mechanical property measurements with nanoscale resolution in any desired environment (air, vacuum, liquid). The limitations of AFM applied to source rocks are also summarized. The process has great potential in micro/nanopore characterization, surface morphology characterization, in situ micromechanical property acquisition, wettability research, and so on. The gradual development and improvement of this new model will expand new methods, bring enlightenment to basic research on unconventional oil and gas resources, and provide a scientific basis for the exploration and development of unconventional oil and gas resources.

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AFM measurement of roughness, adhesive force and wettability in various rank coal samples from Qinshui and Junggar basin, China

Cited by 31 publications

References 61 publications

Novel Discrete Fracture Network Model for Multiphase Flow in Coal

Novel Discrete Fracture Network Model for Multiphase Flow in Coal

Preparation of superhydrophobic coating with excellent abrasion resistance and anti-icing properties using Al2O3/PVDF composites with different Al2O3 particle sizes

Nanoscale physical parameters of source rocks identified by atomic force microscopy: A review

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