Superhydrophobic polyethylcyanoacrylate coatings. Contact area with water measured by Raman spectral images, contact angle and Cassie–Baxter model

2012 ◽  
Vol 388 (1) ◽  
pp. 306-312 ◽  
Author(s):  
L.O. Bonugli ◽  
M.V. Puydinger dos Santos ◽  
E.F. de Souza ◽  
O. Teschke
Keyword(s):  
Contact Angle ◽  
Contact Area ◽  
Raman Spectral ◽  
Baxter Model

scholarly journals The Role of Wettability on the Response of a Quartz Crystal Microbalance Loaded with a Sessile Droplet

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Brandon Murray ◽  
Shankar Narayanan
Keyword(s):  
Contact Angle ◽  
Frequency Response ◽  
Quartz Crystal Microbalance ◽  
Contact Area ◽  
Quartz Crystal ◽  
Quartz Substrate ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Decay Length ◽  
Sessile Droplet

AbstractIn this work, the interaction between a sessile droplet’s contact angle and a quartz crystal microbalance (QCM) is elucidated. We differentiate the QCM’s frequency response to changes in the droplet contact area from variations in the dynamic contact angle. This is done by developing a computational model that couples the electrical and mechanical analysis of the quartz substrate with the visco-acoustic behavior of the sessile droplet. From our analysis, we conclude that changes in the contact angle have an effect on the frequency response of the QCM when the droplet height is on the order of the viscous decay length or smaller. On the other hand, changes in the interfacial contact area of the sessile droplets have a significant impact on the frequency response of the QCM regardless of the droplet size.

scholarly journals Analysis of contact area between water and irregular fibrous surface for prediction of wettability

RSC Advances ◽  
2016 ◽  
Vol 6 (77) ◽  
pp. 73313-73322 ◽  
Author(s):  
Yue Yuan ◽  
Seong-O Choi ◽  
Jooyoun Kim
Keyword(s):  
Contact Area ◽  
Area Fraction ◽  
Roughened Surface ◽  
Baxter Model ◽  
Solid Area

A characterization method was developed, which visualizes the wetted solid area fraction (fs) of the Cassie–Baxter model on a roughened surface.

scholarly journals Relationship of Catheter Contact Angle and Contact Force with Contact Area on the Surface of Heart Muscle Tissue in Cardiac Catheter Ablation

2021 ◽  
Author(s):  
Kriengsak Masnok ◽  
Nobuo Watanabe
Keyword(s):  
Contact Angle ◽  
Catheter Ablation ◽  
Contact Force ◽  
Contact Area ◽  
Heart Muscle ◽  
Contact Angles ◽  
Contact Forces ◽  
Logarithmic Function ◽  
Experimental Procedure ◽  
Relationship Of

Abstract Purpose The aims of this study were to develop an experimental procedure for setting the catheter angle with respect to the surface of the heart muscle and the catheter contact force and to investigate the catheter contact area on the heart muscle as a function of catheter contact angle and force. Methods Visualization tests were performed for 5 contact angles (0°, 30°, 45°, 60°, and 90°) and 8 contact forces (2, 4, 6, 10, 15, 20, 30, and 40 gf). Each experiment was repeated 6 times with 2 different commercially available catheter tips. Results The morphology of the contact area was classified into rectangular, circular, ellipsoidal, and semi-ellipsoidal. The correlation between contact force and contact area was a logarithmic function; increasing contact force was associated with increased contact area. At the same contact force, the correlation between contact angle and contact area was inverse; decreasing contact angle was associated with a corresponding increase in contact area. Conclusion Both the catheter contact angle and contact force substantially impact the contact area and morphology in catheter ablation procedures.

scholarly journals SHAPE OF A SLIDING CAPILLARY CONTACT DUE TO THE HYSTERESIS OF CONTACT ANGLE: THEORY AND EXPERIMENT

2021 ◽  
Vol 19 (2) ◽  
pp. 175
Author(s):  
Valentin L. Popov ◽  
Iakov A. Lyashenko ◽  
Jasminka Starcevic
Keyword(s):  
Experimental Study ◽  
Contact Angle ◽  
Liquid Layer ◽  
Thermodynamic Equilibrium ◽  
Contact Area ◽  
Classical Problem ◽  
Tangential Direction ◽  
Boundary Line ◽  
Friction Law ◽  
Theory And Experiment

We consider a classical problem of a capillary neck between a parabolic body and a plane with a small amount of liquid in between. In the state of thermodynamic equilibrium, the contact area between the bodies and the liquid layer has a circular shape. However, if the bodies are forced to slowly move in the tangential direction, the shape will change due to the hysteresis of the contact angle. We discuss the form of the contact area under two limiting assumptions about the friction law in the boundary line. We also present a detailed experimental study of the shape of sliding capillary contact in dependence on the roughness of the contacting surfaces.

516 Effects of solid-liquid-vapor contact area at triple phase boundary on contact angle

2014 ◽  
Vol 2014.67 (0) ◽  
pp. _516-1_-_516-2_
Author(s):  
Norihiro ISHIMARU ◽  
Naohiro AZUKIZAWA ◽  
Gyoko NAGAYAMA ◽  
Takaharu TSURUTA
Keyword(s):  
Contact Angle ◽  
Phase Boundary ◽  
Contact Area ◽  
Triple Phase Boundary ◽  
Solid Liquid ◽  
Liquid Vapor

A NUMERICAL STUDY ON THE UNDERWATER APPARENT CONTACT ANGLE OF OIL DROPLETS ON MICROSTRUCTURE SURFACE

2019 ◽  
Vol 27 (01) ◽  
pp. 1950095 ◽  
Author(s):  
HYONCHOL CHOE ◽  
SONGHAK KIM ◽  
CHOLHUAN O ◽  
JISONG ZONG ◽  
WONCHOL SONG
Keyword(s):  
Contact Angle ◽  
Numerical Simulations ◽  
Numerical Study ◽  
Volume Of Fluid ◽  
Contact Angles ◽  
Apparent Contact Angle ◽  
Oil Droplets ◽  
Oil Droplet ◽  
Vof Model ◽  
Baxter Model

In this study, the apparent contact angles of oil droplets on the rough surfaces in water were numerically studied using the Volume of Fluid (VOF) model. The results showed that the roughness of the surface affected the wettability. By increasing the roughness of the surface, the oleophilicity of the oleophilic surface and the oleophobicity of the oleophobic surface could be increased. Furthermore, the applicability and limitations of the prediction of the underwater apparent contact angle of the oil droplet by the contact angle model were investigated by 3D numerical simulations. It suggests that Wenzel model can accurately predict the underwater apparent contact angle of oil droplets on all the oleophilic, neutral and oleophobic surfaces, and Cassie model can only be applied to the oleophobic surface and Cassie–Baxter model can only be applied to the oleophilic surface.

scholarly journals Catheter contact area strongly correlates with lesion area in radiofrequency cardiac ablation: an ex vivo porcine heart study

2021 ◽  
Author(s):  
Kriengsak Masnok ◽  
Nobuo Watanabe
Keyword(s):  
Contact Angle ◽  
Catheter Ablation ◽  
Contact Force ◽  
Contact Area ◽  
Radiofrequency Catheter Ablation ◽  
Contact Angles ◽  
Contact Forces ◽  
Ablation Lesion ◽  
Lesion Area ◽  
Lesion Depth

Abstract Purpose Our previous study confirmed that not only force but also the catheter contact angle substantially impacted the contact area and its morphology. Therefore, in this study, we aimed to further investigate the relationship between the catheter contact area and the dimensions of the ablation lesion area as a function of catheter contact angle and force in radiofrequency catheter ablation. Methods The radiofrequency catheter ablation test was performed for 5 contact angles and 8 contact forces at a fixed ablation time of 30 s. The initial impedance was 92.5 ± 2.5 Ω, the temperature during ablation was 30 °C, and the power was 30 W. The irrigation rate during ablation was set to 17 mL/min. Each experiment was repeated 6 times. Results The catheter contact area showed a strong correlation with the ablation lesion area (r = 0.8507). When the contact area was increased, the lesion area also increased linearly in a monotonic manner. The relationships between catheter contact force and ablation lesion area and between catheter contact force and ablation lesion depth are logarithmic functions in which increased contact force was associated with increased lesion area and depth. The catheter contact angle is also an important determinant of the lesion area. The lesion area progressively increased when the contact angle was decreased. In contrast, the lesion depth progressively increased when the contact angle was increased. Conclusions The catheter contact area was strongly correlated with the ablation lesion area. Additionally, catheter contact force and contact angle significantly impacted the dimensions of the lesion in radiofrequency catheter ablation procedures.

Stochastic Modelling of Drop Coalescence on Non-Porous Substrates for Inkjet Applications

2011 ◽  
Author(s):  
J. William Boley ◽  
Robert A. Sayer ◽  
George T.-C. Chiu
Keyword(s):  
Contact Angle ◽  
Contact Area ◽  
Deposition Time ◽  
Mixed Model ◽  
Stochastic Modelling ◽  
Time Difference ◽  
Difference Threshold ◽  
Print Quality ◽  
Drop Coalescence ◽  
Constant Contact Angle

Coalescence between two drops on a substrate is one of the important factors that can affect print quality in inkjet applications. Two stochastic models (constant contant angle mode and constant contact area mode) that consider drop placement error, drop impact, and drop evaporation are proposed for determining the probability of coalescence between adjacently printed drops on nonporous substrates. Experiments are conducted to measure the probability of coalescence with respect to deposition time difference between adjacently printed drops and compared to the predictions of the models. The measured coalescence follows the constant contact angle mode evaporation model during the initial phase of the life of the first drop, which is followed by a mix between the constant contact angle mode and the constant contact area mode models for the remainder of the life of the first drop. This study shows that for probabilities of coalescence between 10% and 80% the constant contact angle mode model can be used to determine deposition time difference threshold values for adjacent drops in applications promoting drop coalescence while the constant contact area mode model can be used for applications avoiding drop coalescence. Further efforts are needed to capture the dynamics of the mixed-model evaporation and to more accurately predict larger (greater than 80%) and smaller (less than 10%) occurrences of coalescence.

scholarly journals Research on the elastic–plastic external contact mechanical properties of cylinder

2020 ◽  
Vol 103 (2) ◽  
pp. 003685042092781
Author(s):  
TieNeng Guo ◽  
Xu Hua ◽  
ZhiJie Yan ◽  
Chunsheng Bai
Keyword(s):  
Contact Angle ◽  
Finite Element ◽  
Contact Area ◽  
Contact Stiffness ◽  
Outer Cylinder ◽  
Contact Angles ◽  
Contact Deformation ◽  
Cylinder Radius ◽  
Elastic Plastic ◽  
Plastic Stage

Based on Hertz contact theory, an elastic-plastic contact mechanics model of outer cylinder under different contact angles of axis is proposed. The relationship among contact angle, load and contact deformation, contact stiffness and contact area is established. The finite element method is used to simulate the elastic-plastic contact process of the cylinder. The influence of the load and radius of the cylinder model on the contact deformation and the contact stiffness is compared and analyzed under different contact angles. The error of the analysis results of the finite element and the mechanical model is within 9%. On this basis, the influence of contact deformation, contact area and contact angle on the contact stiffness of the outer cylinder in elastic and plastic stage is explored. The results show that in the stage of elastic and plastic deformation, the amount of contact deformation and contact area increase with the increase of load. The contact stiffness decreases with the increase of contact angle and increases with the increase of cylinder radius. The amount of contact deformation decreases with the increase of cylinder radius, and tends to constant gradually. In the elastic stage, the contact stiffness increases with the increase of load. The contact area decreases with the increase of contact angle and increases with the increase of cylinder radius. In the plastic stage, the contact stiffness is constant with the increase of load, and the contact area is independent of contact angle and cylinder radius.

scholarly journals A dynamic Cassie–Baxter model

Soft Matter ◽  
2015 ◽  
Vol 11 (8) ◽  
pp. 1589-1596 ◽  
Author(s):  
Tingyi Leo Liu ◽  
Zhiyu Chen ◽  
Chang-Jin Kim
Keyword(s):  
Contact Angle ◽  
New Model ◽  
Wide Range ◽  
Receding Contact ◽  
Receding Contact Angle ◽  
Baxter Model

A new model predicts the receding contact angle of a liquid suspended on microstructures for a wide range of data in the literature regardless of their distinct patterns and receding modes.

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