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Related Concept Videos

Surface Tension and Surface Energy01:16

Surface Tension and Surface Energy

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When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
Consider a beaker filled with liquid. The bulk molecules in the liquid experience equal attractive forces on all sides with the surrounding molecules. However, the surface molecules experience a net attractive force downward due to the bulk molecules. The surface of the liquid behaves like a stretched membrane,...
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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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Specific Gravity of Aggregate01:19

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Aggregates typically contain pores, which can be either permeable or impermeable. Considering the pores in the aggregates, the specific gravity of aggregates is defined in three different forms, namely, bulk or gross specific gravity, apparent specific gravity, and absolute specific gravity.
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Surface Tension of Fluid01:22

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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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Toughness and hardness are critical properties of aggregate materials used in concrete, particularly on pavement surfaces and industrial flooring subjected to heavy loads. Toughness is defined as the aggregate's resistance to failure by impact and is measured by the aggregate impact value (AIV). For this, the aggregate impact value test is performed, wherein the impact is delivered by a standard hammer, which falls freely under its own weight onto the aggregates. The aggregates fragment in...
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Contact Angle01:13

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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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Measurement of Aggregate Cohesion by Tissue Surface Tensiometry
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STAND: Surface Tension for Aggregation Number Determination.

Pablo F Garrido1, Pilar Brocos1, Alfredo Amigo1

  • 1Departamento de Física Aplicada, Facultade de Física, Universidade de Santiago de Compostela , 15782 Santiago de Compostela, Spain.

Langmuir : the ACS Journal of Surfaces and Colloids
|April 7, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces a new model to analyze surface tension data for amphiphiles in water. It accurately determines properties like aggregation number and micellization free energy using a novel approach based on free molecule concentrations.

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Area of Science:

  • Colloid and Surface Science
  • Physical Chemistry

Background:

  • Surface tension is highly sensitive to amphiphilic molecule concentration.
  • Existing models may not fully capture the complex equilibria in amphiphilic solutions.

Purpose of the Study:

  • To present and validate a new model for analyzing surface tension data of amphiphilic molecules.
  • To accurately determine key thermodynamic and aggregation properties from surface tension measurements.

Main Methods:

  • Developed a model based on double equilibrium (free/aggregated in solution, free at interface).
  • Utilized Langmuir isotherm and Gibbs adsorption equation in terms of free molecules.
  • Employed coupled nonlinear fittings with a custom-developed web application.

Main Results:

  • The model was validated using literature data and fluorescence measurements.
  • The web application allows rapid calculation of aggregation number, micellization free energy, adsorption constant, and surface excess.
  • Determined solute distribution between free and aggregate species and surface coverage.

Conclusions:

  • The new model provides a robust method for characterizing amphiphilic behavior in aqueous solutions.
  • The developed software simplifies the analysis of surface tension data, offering insights into molecular interactions.
  • The model is applicable to non-ionic compounds and requires surface tension vs. concentration data.