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Effect of Camera Parallax Angle on the Accuracy of Static Contact Angle Measurements.
Langmuir
March 2024
Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States.
Article Synopsis
- Measuring contact angles in sessile drop experiments is crucial for understanding surface wettability and free energy, but parallax angle (PA) can introduce significant errors in these measurements.
- The study simulated experiments to show that contact angle errors increase when true contact angles deviate from 90°, leading to misestimation—for angles less than 90°, the angle is overestimated, and for angles greater than 90°, it's underestimated.
- Results indicate that the PA and the shape of the drop can influence the accuracy of contact angle measurements, with guidelines provided to minimize these errors in future experiments.*
The Nanoscale Wetting Parameter and Its Role in Interfacial Phenomena: Phase Transitions in Nanopores.
Langmuir
December 2023
Department of Chemical & Biomolecular Engineering, North Carolina State University, 911 Partners' Way, Raleigh, North Carolina 27695-7905, United States.
Through analysis of the statistical mechanical equations for a thin adsorbed film (gas, liquid, or solid) on a solid substrate or confined within a pore, it is possible to express the equilibrium thermodynamic properties of the film as a function of just two dimensionless parameters: a nanoscale wetting parameter, α, and pore width, . The wetting parameter, α, is defined in terms of molecular parameters for the adsorbed film and substrate and so is applicable at the nanoscale and for films of any phase. The main assumptions in the treatment are that (a) the substrate structure is not significantly affected by the adsorbed layer and (b) the diameter of the adsorbate molecules is not very small compared to the spacing of atoms in the solid substrate.
View Article and Find Full Text PDFWetting Behavior of a Three-Phase System in Contact with a Surface.
Macromolecules
May 2022
Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, U.K.
We extend the Cahn-Landau-de Gennes mean field theory of wetting in binary mixtures to understand the wetting thermodynamics of a three phase system (e.g., polymer dispersed liquid crystals or polymer-colloid mixtures) that is in contact with an external surface, which prefers one of the phases.
View Article and Find Full Text PDFCharacterization of non-graphitized carbon blacks: a model with surface crevices.
Phys Chem Chem Phys
June 2021
School of Chemical Engineering University of Queensland St Lucia, QLD 4072, Australia.
Experimental isotherms for argon and nitrogen adsorption on two non-graphitized carbon substrates, Carbopack B and Cabot BP280, do not obey Henry's Law in the range of pressures accessible to the most sensitive MKS pressure transducers. At high pressures, close to the bulk coexistence pressure (P0), the isotherms at temperatures below the bulk triple point temperature cross the P0 axis at a finite loading, a behaviour which is interpreted as incomplete wetting. It was found that the adsorbed density at P0 for Cabot BP280 is lower than that for Carbopack B which is, in turn, only slightly lower than that for the highly graphitized Carbopack F, suggesting that there is a long-range effect of the surface structure in non-graphitized carbon blacks, in the accumulation of higher layers, especially for Cabot BP280.
View Article and Find Full Text PDFInvestigation of Crystal Shape Controllability in the Micro-Pulling-Down Method for Low-Wettability Systems.
ACS Omega
March 2021
Department of Research and Development, C&A Corporation, Sendai 980-0845, Japan.
This study presents the criteria for shape control in the micro-pulling-down (μ-PD) method for low-wettability systems (dewetting μ-PD method), which enables us to achieve highly shape-controllable crystal growth. In the dewetting μ-PD method, the presence of the die wall inhibits the direct observation of the meniscus during the process. Therefore, in this study, the meniscus shape was calculated using the Young-Laplace equation to predict the optimal crystal growth conditions.
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