Related Experiment Video
Updated: Jul 8, 2025
07:59
Synthesis and Characterization of Multi-Modal Phase-Change Porphyrin Droplets
Published on: October 15, 2021
3.7K
Droplet impacting on pillared hydrophobic surfaces with different solid fractions
Lei Xia1, Zhen Yang2, Faze Chen2
1School of Mechanical Engineering, Tianjin University, Tianjin 300350, China.
Journal of Colloid and Interface Science
|December 15, 2023
Summary
Droplet impact on hydrophobic surfaces is influenced by solid fraction, affecting bouncing behavior. A novel third pressure peak during rebound offers insights for designing advanced hydrophobic surfaces.
Area of Science:
- Fluid dynamics
- Surface science
- Micro/nano-structured surfaces
Background:
- Droplet impact dynamics are crucial for various applications.
- Surface characteristics, like solid fraction, significantly influence droplet behavior.
- Understanding these interactions is key to optimizing surface performance.
Purpose of the Study:
- Investigate droplet impact dynamics on pillared hydrophobic surfaces with varying solid fractions.
- Analyze the effects of solid fraction on droplet velocity, pressure distribution, and bouncing behavior.
- Characterize maximum wetting spreading, impacting depth, and contact time.
Main Methods:
- Systematic investigation using phase-field simulations.
- Studied water droplet impacts on pillared hydrophobic surfaces.
- Varied Weber numbers and surface solid fractions.
Main Results:
- Identified a three-peak pressure profile during droplet impact, dependent on surface solid fraction.
- The first two peaks result from initial impact and droplet recoil.
- A novel third pressure peak was discovered, linked to hydrodynamic singularity during rebound.
Conclusions:
- Surface solid fraction critically influences droplet impact and rebound dynamics.
- The discovered pressure peaks provide new insights into fluid-surface interactions.
- Findings aid in designing and optimizing micro/nano-structured hydrophobic surfaces.
More Related Videos
Related Concept Videos
01:23Factors Affecting Dissolution: Particle Size and Effective Surface Area
853
Dissolution kinetics, an essential aspect of oral drug delivery, is significantly influenced by the drug's particle size. According to the Noyes-Whitney dissolution model, the dissolution rate correlates directly with the drug's surface area. The larger the surface area, the higher the drug's solubility in water, leading to a faster drug dissolution rate. Reducing particle size increases the effective surface area, enhancing the dissolution process. Micronization and nanosizing are...
853
01:28Factors Influencing Drug Absorption: Pharmaceutical Parameters
134
Solid dosage forms such as tablets and capsules undergo rigorous manufacturing processes to ensure stability and effectiveness. Their dissolution and absorption properties are influenced significantly by the choice of excipients (inactive ingredients that serve various roles in the formulation), and the methodology applied during production. The manufacturing parameters, such as compression force and granulation techniques, significantly affect dissolution rates. Elevated compression forces...
134
01:21Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism
311
Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
Some polymorphic crystals possess lower aqueous solubility than their amorphous counterparts, leading to incomplete absorption. For instance, the oral suspension of Chloramphenicol, which...
Some polymorphic crystals possess lower aqueous solubility than their amorphous counterparts, leading to incomplete absorption. For instance, the oral suspension of Chloramphenicol, which...
311
01:20Factors Affecting Dissolution: Drug Permeability, Stability and Stereochemistry
208
Orally administered drugs primarily enter the systemic circulation via passive diffusion through the intestinal membranes. The drug's absorption is influenced by drug stability in the gastrointestinal GI tract, membrane permeability, the surface area available for absorption, luminal drug concentration, and residence time in the lumen. Drug permeability can be enhanced by adjusting the lipophilicity, polarity, or molecular size of the drug, promoting its passive transport across intestinal...
208
01:09Colloidal precipitates
593
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
593
01:22Factors Influencing Drug Absorption: Physicochemical Parameters
296
The physicochemical characteristics of drugs play a crucial role in formulating stable and bioavailable drug products. The solubility of a drug, governed by the varying pH along the GI tract and its dissociation constant (pKa), is pivotal in determining its ionization state and absorption rate. Notably, weak acids and bases remain unionized and are absorbed more rapidly.
Enhanced drug absorption can be achieved by reducing particle sizes and increasing surface areas, thereby facilitating...
Enhanced drug absorption can be achieved by reducing particle sizes and increasing surface areas, thereby facilitating...
296