Nonuniform Receding Dynamics of Thin Viscous Oil Films on Roughened Surfaces

Energy & Fuels, Journal Year: 2024, Volume and Issue: 38(17), P. 16114 - 16124

Published: Aug. 26, 2024

Liquids in contact with chemically and physically heterogeneous surfaces are ubiquitously encountered, yet little is understood about how those surface heterogeneities affect the dewetting dynamics of thin liquid films. Variations local line mobility cause nonuniform dewetting, our working hypothesis was to decouple explain role each on a viscous liquid. Thin film recession measured roughened that were either clean or contaminated by clustered macromolecules. Atomic force microscopy used characterize features (peaks troughs) before after droplet dewetting. Surfaces initially wetted highly air flooding water. On uncontaminated surfaces, pattern smaller micron-sized droplets dispersed around receded primary remained surface. only seen roughest smoother secondary daughter formed but much larger less number. The due chemical heterogeneity. variations velocity which occurred at pits changing apparent angle. Hence, size corresponded pits. For effect heterogeneity significant than physical roughness had more an influence modulating receding line.

Language: Английский

Reframing Ice Adhesion Mechanisms on a Solid Surface

Published: Jan. 1, 2023

Mitigation of icing hazards is interest for a broad range technological applications: coatings showing low ice adhesion represent one the possible solutions, ideally as purely passive strategy or combined with active de-icing systems. Comparing different surfaces, however, far from trivial, even using presumably simple horizontal push tests. Studies typically report average shear stress, based on ration between applied force and ice-substrate contact area; such values heavily depend testing conditions. One reasons that interface fracture can be due to two fundamental detachment mechanisms: stress-dominated toughness-dominated. Ice tests correctly understood only if appropriate mechanism specific test identified; otherwise, stresses are underestimated. In this study, combination experimental numerical methods, we propose reframe theoretical understanding mechanisms, predict type Practical guidelines provided model facilitates differentiation regimes correct interpretation results, both traditional better design fabricate icephobic materials.

Language: Английский

4D-XCT monitoring of void formation in thick methacrylic composites produced by infusion

Acta Materialia, Journal Year: 2024, Volume and Issue: 281, P. 120449 - 120449

Published: Oct. 3, 2024

Language: Английский