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Related Concept Videos

Adhesion01:14

Adhesion

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Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
Capillary action is a result of water’s adhesive tendencies. When a narrow...
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Surface Tension, Capillary Action, and Viscosity02:57

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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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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.
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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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Contact Angle01:13

Contact Angle

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When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
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Capillarity in Fluid01:19

Capillarity in Fluid

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Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
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Comment on "Solid-Liquid Work of Adhesion".

C W Extrand1

  • 1CPC, 1001 Westgate Drive, St. Paul, Minnesota 55114, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|August 29, 2017
PubMed
Summary
This summary is machine-generated.

Researchers re-evaluated liquid drop detachment from surfaces using a centrifugal adhesion balance (CAB). By estimating receding contact angles, they accurately predicted the work of adhesion, aligning with previous findings.

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Area of Science:

  • Surface science
  • Adhesion science
  • Fluid dynamics

Background:

  • The centrifugal adhesion balance (CAB) is used to measure the work of adhesion between liquid drops and solid surfaces.
  • Previous studies required large contact angles to reconcile CAB measurements with the Young-Dupré equation.
  • An alternative interpretation of CAB data is proposed to address discrepancies in adhesion work calculations.

Purpose of the Study:

  • To offer an alternative interpretation of results from Tadmor et al.'s centrifugal adhesion balance (CAB) study.
  • To estimate receding contact angles from existing CAB experimental data.
  • To predict the work of adhesion using these estimated receding contact angles.

Main Methods:

  • Utilizing data from Tadmor et al.'s (Langmuir 2017) centrifugal adhesion balance experiments.
  • Calculating receding contact angles based on the experimental parameters and observed drop behavior.
  • Applying the calculated receding contact angles to predict the work of adhesion.

Main Results:

  • Receding contact angles were successfully estimated from the centrifugal adhesion balance data.
  • The work of adhesion predicted using these estimated receding contact angles showed strong agreement with the values reported by Tadmor et al.
  • This suggests that receding contact angles provide a consistent measure for work of adhesion.

Conclusions:

  • The study provides a new perspective on interpreting centrifugal adhesion balance data.
  • Estimating receding contact angles offers a viable method for determining the work of adhesion, consistent with established theories.
  • This approach may help resolve discrepancies observed when comparing experimental adhesion measurements with theoretical models like the Young-Dupré equation.