Difference in pore contact angle and the contact angle measured on a flat surface and in an open space

Li, Xingxun; Fan, Xianfeng; Brandani, Stefano

doi:10.1016/j.ces.2014.06.024

Cited by 61 publications

(35 citation statements)

References 48 publications

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“…These results imply that the status of interface direction is more Pore throat size. Receding contact angles increase with decreasing pore throat size (Figure 3a), in agreement with previous studies [32,47]. Li et al [32] have reported that the contact angle increases when smaller capillary tubes are used.…”

Section: Dynamic Contact Anglesupporting

confidence: 81%

“…Receding contact angles increase with decreasing pore throat size (Figure 3a), in agreement with previous studies [32,47]. Li et al [32] have reported that the contact angle increases when smaller capillary tubes are used. Using X-ray CT images, Tudek et al [47] have observed that CO 2 bubbles trapped in smaller pores of a sandstone have higher contact angles due to local higher pressure of CO 2 in small pores.…”

Section: Dynamic Contact Anglesupporting

confidence: 81%

“…However, Li et al [32] have recently reported that water contact angle on a flat glass sheet can be different from a contact angle inside of a capillary tube with the same material (the inner diameter of the tube ranged from 100 to 1000 µm). The importance of more realistic wettability in predicting multi-phase flow behavior requires the development of new techniques for measuring contact angle at pore-scale level.…”

Section: Introductionmentioning

confidence: 99%

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Direct Measurement of Static and Dynamic Contact Angles Using a Random Micromodel Considering Geological CO2 Sequestration

Jafari

Jung

2017

Sustainability

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Abstract:The pore-level two-phase fluids flow mechanism needs to be understood for geological CO 2 sequestration as a solution to mitigate anthropogenic emission of carbon dioxide. Capillary pressure at the interface of water-CO 2 influences CO 2 injectability, capacity, and safety of the storage system. Wettability usually measured by contact angle is always a major uncertainty source among important parameters affecting capillary pressure. The contact angle is mostly determined on a flat surface as a representative of the rock surface. However, a simple and precise method for determining in situ contact angle at pore-scale is needed to simulate fluids flow in porous media. Recent progresses in X-ray tomography technique has provided a robust way to measure in situ contact angle of rocks. However, slow imaging and complicated image processing make it impossible to measure dynamic contact angle. In the present paper, a series of static and dynamic contact angles as well as contact angles on flat surface were measured inside a micromodel with random pattern of channels under high pressure condition. Our results showed a wide range of pore-scale contact angles, implying complexity of the pore-scale contact angle even in a highly smooth and chemically homogenous glass micromodel. Receding contact angle (RCA) showed more reproducibility compared to advancing contact angle (ACA) and static contact angle (SCA) for repeating tests and during both drainage and imbibition. With decreasing pore size, RCA was increased. The hysteresis of the dynamic contact angle (ACA-RCA) was higher at pressure of one megapascal in comparison with that at eight megapascals. The CO 2 bubble had higher mobility at higher depths due to lower hysteresis which is unfavorable. CO 2 bubbles resting on the flat surface of the micromodel channel showed a wide range of contact angles. They were much higher than reported contact angle values observed with sessile drop or captive bubble tests on a flat plate of glass in previous reports. This implies that more precaution is required when estimating capillary pressure and leakage risk.

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Section: Dynamic Contact Anglesupporting

confidence: 81%

Section: Dynamic Contact Anglesupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Direct Measurement of Static and Dynamic Contact Angles Using a Random Micromodel Considering Geological CO2 Sequestration

Jafari

Jung

2017

Sustainability

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“…The water contact angle of PDMS scaffolds increased with decreasing pore size, which was in agreement with other results. 23 …”

Section: Surface Wettability Of Pdms Scaffoldsmentioning

confidence: 97%

Characterization of 3D elastic porous polydimethylsiloxane (PDMS) cell scaffolds fabricated by VARTM and particle leaching

Cui

Xie

et al. 2015

J of Applied Polymer Sci

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In this study, elastic porous polydimethylsiloxane (PDMS) cell scaffolds were fabricated by vacuum-assisted resin transfer moulding (VARTM) and particle leaching technologies. To control the porous morphology and porosity, different processing parameters, such as compression load, compression time, and NaCl particle size for preparing NaCl preform, were studied. The porous structures of PDMS cell scaffolds were characterized by scanning electron microscopy (SEM). The properties of PDMS cell scaffolds, including porosity, water absorption, interconnectivity, compression modulus, and compression strength were also investigated. The results showed that after the porogen-NaCl particles had been leached, the remaining pores had the sizes of 150-300, 300-450, and 450-600 lm, which matched the sizes of the NaCl particles. The interconnectivity of PDMS cell scaffolds increases with an increase in the size of NaCl particles. It was also found that the smaller the size of the NaCl particles, the higher the porosity and water absorption of PDMS cell scaffolds. The content of residual NaCl in PDMS/NaCl scaffolds reduces under ultrasonic treatment. In addition, PDMS scaffolds with a pore size of 300-450 lm have better mechanical properties compared to those with pore sizes of 150-300 and 450-600 lm.

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“…3(c) and 3(d)]. We attribute the disagreement to (1) the effect of the top and bottom walls currently ignored in our 2D model, (2) deposition of a thin film of oil on the post that might alter the wetting properties, (3) the difference between measuring the contact angles on flat surfaces and the actual contact angles in small microchannels [29], and (4) change in wetting behavior due to surface roughness and contact-angle hysteresis [30,31] (details of contact-angle hysteresis measurements are provided in the Appendix).…”

Section: Theoretical Setupmentioning

confidence: 89%

Creating Isolated Liquid Compartments Using Photopatterned Obstacles in Microfluidics

et al. 2017

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We propose a method to trap liquid (both oil and water) in a microchannel by sequentially injecting oil and water (or vice versa) over photopatterned obstacles with controlled wetting properties. We present a simple geometrical model to understand the liquid-entrapment process and predict the evolution of the water/oil interface over an obstacle. Our analysis provides an analytic solution that can successfully predict useful properties such as angular position of pinch-off and the amount of captured liquid. We show that we are able to obtain a liquid bridge over two circular obstacles, and we are also able to predict the condition for the formation of a bridge. We further demonstrate the effect of the obstacle shape and how a sudden change in gradient results in larger liquid entrapment. We also demonstrate the ability to entrap isolated liquid chambers for parallel experimentation.

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Difference in pore contact angle and the contact angle measured on a flat surface and in an open space

Cited by 61 publications

References 48 publications

Direct Measurement of Static and Dynamic Contact Angles Using a Random Micromodel Considering Geological CO2 Sequestration

Direct Measurement of Static and Dynamic Contact Angles Using a Random Micromodel Considering Geological CO2 Sequestration

Characterization of 3D elastic porous polydimethylsiloxane (PDMS) cell scaffolds fabricated by VARTM and particle leaching

Creating Isolated Liquid Compartments Using Photopatterned Obstacles in Microfluidics

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