What is the relationship between humidity and water contact angle?
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The relationship between humidity and water contact angle has been studied in several papers. It has been found that the contact angle of a water droplet on a surface increases with increasing relative humidity (RH) . This increase in contact angle with RH is observed in both hydrophobized sand samples and inkjet-printed colloidal drops on a glass substrate . The increase in contact angle with RH is attributed to the adsorption of water molecules on the surface, especially on high-energy mineral surfaces . Additionally, the behavior of water drops spreading and evaporating on surfaces is strongly affected by substrate roughness, with the receding contact angle being influenced by both substrate roughness and relative humidity . Overall, these studies suggest that humidity plays a significant role in modifying the water contact angle on different surfaces.
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38 Citations | The relationship between humidity and water contact angle is not mentioned in the provided paper. |
| The paper does not provide a direct answer to the question about the relationship between humidity and water contact angle. | |
72 Citations | The contact angle of an evaporating colloidal drop is influenced by the relative humidity (RH). |
15 Nov 2013 3 Citations | The paper states that the contact angle of a water droplet on a silicon wafer is reduced when the relative humidity in the air decreases. The contact angle is inversely proportional to the humidity. |
| The paper states that the contact angle increased with increasing relative humidity (RH), indicating that humidity has a positive effect on the water contact angle. |
Related Questions
Is humidity important for plants?5 answersHumidity is crucial for plant growth and development. Research indicates that varying humidity levels significantly impact plant physiology. Higher humidity levels help maintain stomatal openness, facilitating photosynthesis and reducing water loss through evaporation, ultimately enhancing plant growth. Additionally, floral humidity around flowers can act as a cue for pollinators and influence various physiological processes. Conversely, high humidity can compromise plant immunity against pathogens by inhibiting defense gene expression and disrupting essential immune pathways. Moreover, high humidity has been found to alleviate the negative effects of high temperature stress on plants, improving growth, photosynthetic efficiency, and antioxidant enzyme activity. Therefore, maintaining optimal humidity levels is vital for ensuring healthy plant growth and resilience to environmental stresses.
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.
How do high levels of relative humidity affect human health?5 answersHigh levels of relative humidity can have negative effects on human health. It can lead to fatigue, increased susceptibility to infectious diseases and colds, and the development of more serious diseases such as rheumatism and tuberculosis. High humidity also promotes the growth of allergens, mold, mildew, and various pathogenic microorganisms and insects, which can have negative effects on the body and cause respiratory and skin diseases and allergies. On the other hand, humidity can amplify temperature-related health risks, with higher risks found during cold and dry events and warm and wet events. However, population-scale epidemiological studies have found limited impact of humidity on heat-related health outcomes, possibly due to factors such as limited spatial extent of data sets, focus on older vulnerable populations, and improper consideration of temperature-humidity relationships. Future research is needed to better understand the role of humidity in heat-related health risks.
Does the crystallinity of the film affect the water contact angle?3 answersThe crystallinity of the film can affect the water contact angle. In the study by Kaneko et al., hydrophilic films with excellent water sliding properties were prepared using a sol-gel solution, indicating that the film's properties can influence the contact angle. In another study by Li et al., the contact angle of water droplets on polystyrene (PS) thin films was found to depend on the film thickness. The contact angle decreased with decreasing film thickness, suggesting that the crystallinity of the film can impact the contact angle.
Does humidity influence AFM data?5 answersHumidity has been found to influence adhesion forces in atomic force microscopy (AFM) studies. The behavior of adhesion forces can change with repeated contacts and exposure to different relative humidities (RH). The force behavior can evolve from being RH-independent to RH-dependent, with the force generally exhibiting a stable-increasing-stable behavior with increasing RH. The dependence on RH and contact history has been observed, with the behavior of adhesion forces logarithmically increasing with saturation time at lower RHs and becoming independent at higher RHs. The precise tip geometry of the AFM probe also plays a critical role in the humidity dependence of adhesion forces. Additionally, recent developments in contact resonance AFM have allowed for the quantitative monitoring of the influence of humidity on the viscoelasticity of thin films. Experimental measurements and modeling have shown that adhesion forces increase sharply at low RHs and decrease after a certain RH due to the formation and desorption of water molecules.
What is the relationship between contact angle and pressure?5 answersThe contact angle is influenced by pressure. An increase in pressure generally leads to an increase in the contact angle. In physical chemistry of surfaces, it has been observed that an increase in hydrostatic pressure causes an increase in the contact angle on the three-phase contact line. This relationship between contact angle and pressure has been experimentally confirmed in systems where thermodynamic equilibrium is reached. The contact angle-pressure relationship is also affected by the chemical properties of the materials involved. The contact angle can be observed to vary within a range by changing the pressure at the three-phase line. The dependence of the contact angle on pressure provides a possible explanation for contact angle hysteresis. Overall, the contact angle and pressure are interconnected in determining the behavior of liquid-vapor interfaces on solid surfaces.