Did anybody said that contact angle is not a parameter to determine wettability?
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Contact angle is not a primary parameter for determining wettability, except in very restricted situations . The value of the contact angle depends on many other parameters, and it can vary widely even in simple cases . Recent research has shown that contact angles are not the cause of wettability behavior, but rather the effect of wettability behavior and other parameters . Therefore, contact angles measured in two dimensions cannot be trusted to provide accurate values for characterizing wettability .
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01 Aug 2020 | The paper states that contact angles are not primary parameters for determining wettability, except in very restricted situations. However, it does not explicitly mention if anyone has said that contact angle is not a parameter to determine wettability. |
| The paper does not mention anyone stating that contact angle is not a parameter to determine wettability. | |
| The paper does not mention anyone stating that contact angle is not a parameter to determine wettability. The paper discusses the impact of various parameters on contact angle measurements and proposes the use of artificial intelligence techniques to quantify their effects. | |
| The paper does not mention anyone stating that contact angle is not a parameter to determine wettability. The paper focuses on studying the relationship between contact angle and various droplet parameters on anisotropic solid surfaces. | |
| The paper does not mention that contact angle is not a parameter to determine wettability. |
Related Questions
When contact angle measurement was determined?5 answersContact angle measurements have been determined using various methods such as the sessile drop method (SDM), direct observation method (DOB), captive bubble technique, Wilhelmy plate technique, and pendant drop method. The SDM and DOB methods have shown differences in measuring contact angles of soils, with SDM providing surface-level measurements and DOB offering a smaller scale perspective. A novel method introduced for contact angle measurements under equilibrium conditions involves using a capillary bridge from a pendant drop as a probe, enabling precise measurements even for ultralow contact angles. In multiphase lattice Boltzmann simulations, an improved method accurately determines real-time contact angles, showcasing a linear relationship with surface chemical potential and facilitating dynamic contact angle hysteresis analysis. These methods play a crucial role in characterizing substrate wettability and understanding wetting phenomena in various applications.
Which satotaion peg cant change wettability ?5 answersThe saturation at which PEG cannot change wettability is not explicitly mentioned in the provided contexts. However, the studies demonstrate that PEG, specifically PEG-8000, plays a significant role in enhancing wettability in various scenarios. PEG nanostructures have been shown to transition surfaces from hydrophilic to hydrophobic states. In the context of drilling fluids, the addition of nonionic surfactants like PEG can alter the wettability of reservoir rocks, shifting them from oleophilic to hydrophilic states, thereby reducing formation damage and increasing oil production. Additionally, PEG-8000 in artificial tear products has been found to enhance wettability persistently, even after the product is removed, indicating its lasting impact on surface properties.
How to rate the angle of wettability?4 answersTo rate the angle of wettability, various methods are employed based on the specific surface and liquid interactions. Traditional techniques involve measuring contact angles using macroscopic contact angle meters. These meters assess the angle formed between a liquid droplet and a solid surface to determine wettability. Advanced systems combine contact angle measurement equipment with wettability testers to quantitatively evaluate wettability based on physical parameters like contact angle and interfacial tension. Additionally, studies have shown that the contact angle can vary along the contact line, leading to noncircular wetting patterns, which can be better evaluated by considering average contact angles instead of single-point measurements. These approaches provide insights into surface properties and interactions, essential for understanding wettability.
Is the contact angle a measure of wettability on a hydrophobic porous surface?5 answersThe contact angle is a measure of wettability on a hydrophobic porous surface. It is an important index for evaluating the hydrophobicity of a solid surface. The contact angle is inversely proportional to the droplet-solid contact radius and contact area, and directly proportional to the projected area of the droplet. Different methods have been proposed to measure the contact angle, including the sessile drop method and 3D μCT scanning. The contact angle can also be determined using high-resolution images and alternative approaches that provide an averaged assessment of wettability. The contact angle on a hydrophobic porous surface can be influenced by factors such as surface structure, water penetration into the film, and the presence of hydrophilic and hydrophobic domains. Overall, the contact angle is a useful measure for characterizing wettability on hydrophobic porous surfaces and understanding the wetting behavior of fluids in porous media.
There are relationship of pressure and wetting angle?3 answersThe relationship between pressure and wetting angle has been studied in several papers. Léger et al. investigated the influence of wetting on pressure infiltration and found that changes in contact angle caused the saturation/pressure curves to shift. Baver et al. used rectangular capillary tubes to study dynamic contact angles in the presence of gravity and found that the Hoffman relationship between dynamic contact angle and water velocity applies to gravity-affected flow fields. Ahmed et al. compared the role of drop pinch-off and resultant dynamic wetting pressure in contact angle measurements and highlighted the importance of a well-controlled drop deposition to guarantee accurate data. Schlangen et al. derived thermodynamic relationships between vapour adsorption and wetting and used the spreading tension and contact angle to predict wettability in a liquid-liquid-solid system. Overall, these studies provide insights into the relationship between pressure, wetting angle, and contact angle measurements.
What is the effect of pressure on the wetting?4 answersThe effect of pressure on wetting depends on the specific system being studied. In the case of aluminium bicrystals, pressure does not have an effect on the wetting angle, but the misorientation of the grain boundaries does. However, in the case of Fe-6 at.% Si alloy bicrystals, an increase in pressure leads to a transition from complete to incomplete wetting of the grain boundaries by the zinc-rich melt. Additionally, in the study of dynamic wetting, slight pressure fluctuations in the air can generate large lateral displacements of the contact line, reducing the air gap between the liquid sheet and the solid substrate. Therefore, the effect of pressure on wetting can vary depending on the specific system and conditions being studied.