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Related Concept Videos

Cohesion01:07

Cohesion

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Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
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Solubility03:00

Solubility

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Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules,...
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Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

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Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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Entropy and Solvation02:05

Entropy and Solvation

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The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
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Colloids03:22

Colloids

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Surface Tension of Fluid01:22

Surface Tension of Fluid

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Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies...
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Fabrication of Superhydrophobic Metal Surfaces for Anti-Icing Applications
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Sticky Superhydrophobic State.

Youhua Jiang1,2, Yilian Xiao1, Chuanqi Wei1,2

  • 1Department of Mechanical Engineering (Robotics), Guangdong Technion - Israel Institute of Technology, Shantou, Guangdong 515063, China.

The Journal of Physical Chemistry Letters
|November 21, 2024
PubMed
Summary
This summary is machine-generated.

Droplets stick more to hollowed micropillars as pore size increases, reversing common sense. This "sticky superhydrophobic state" enhances droplet adhesion due to hindered contact line sliding.

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Area of Science:

  • Surface science
  • Materials science
  • Fluid dynamics

Background:

  • Conventional superhydrophobic surfaces exhibit low adhesion due to minimal solid-liquid contact.
  • Intuitive understanding suggests larger contact areas increase droplet adhesion.

Purpose of the Study:

  • To investigate the droplet adhesion behavior on hollowed micropillars.
  • To explore the counterintuitive phenomenon of increased adhesion with decreased contact area.

Main Methods:

  • Fabrication and characterization of hollowed micropillars.
  • Experimental measurement of droplet depinning force.
  • Development of a theoretical model based on contact line dynamics.

Main Results:

  • Increased pore size in hollowed micropillars led to a decrease in solid-liquid contact area.
  • This decrease in contact area resulted in an increased droplet depinning force.
  • A novel "sticky superhydrophobic state" was identified, characterized by suspended droplets and high adhesion.

Conclusions:

  • Hollowed micropillars exhibit a reversed adhesion trend compared to filled structures.
  • Pore-induced hindrance of contact line sliding enhances droplet adhesion.
  • The developed model accurately predicts droplet depinning forces on both filled and hollowed pillars.