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Related Concept Videos

Capillary Beds01:20

Capillary Beds

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Capillary beds are networks of tiny blood vessels that play a crucial role in the circulatory system. These beds are where the exchange of gases, nutrients, and waste products occurs between the blood and surrounding tissues. Each capillary bed consists of numerous capillaries, which are the smallest blood vessels in the body, typically only one cell-thick. This thinness allows for the efficient diffusion of substances.
Capillaries connect arterioles, small branches of arteries, to venules,...
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Capillaries and Their Types01:20

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Capillaries, a crucial constituent of the circulatory system, are diminutive vessels with a diameter between 5–10 micrometers, accommodating perfusion to the tissues through the phenomenon known as microcirculation. Through their permeable walls, consisting of an endothelial layer ensconced by a basement membrane and sporadically dispersed smooth muscle fibers, the exchange of substances between the blood and the interstitial fluid becomes plausible. Variance in wall composition exists,...
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Capillary Exchange01:28

Capillary Exchange

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The cardiovascular system's chief role is to disseminate gases, nutrients, waste, and other substances to the body's cells. Small molecules like gases, lipids, and lipid-soluble substances directly diffuse through capillary wall endothelial cell membranes. Glucose, amino acids, and ions, including sodium, potassium, calcium, and chloride, use transporters for facilitated diffusion via membrane-specific channels. Glucose, ions, and bigger molecules may also pass through intercellular...
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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.
Surface tension is crucial to capillarity. It results from cohesive forces between liquid molecules at the liquid-air boundary, forming a skin that resists external forces. When the capillary tube...
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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

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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Fabrication and Visualization of Capillary Bridges in Slit Pore Geometry
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Fabrication and Visualization of Capillary Bridges in Slit Pore Geometry

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Capillary bridges between soft substrates.

Jason S Wexler1, Tiara M Heard1, Howard A Stone1

  • 1Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, USA.

Physical Review Letters
|March 4, 2014
PubMed
Summary
This summary is machine-generated.

A wetting droplet in a thin gap pulls elastic bodies together, increasing adhesion. Large, flat droplets cause significant surface deformation, leading to spontaneous gap closure with increased volume.

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Area of Science:

  • Soft Matter Physics
  • Fluid Dynamics
  • Adhesion Science

Background:

  • Wetting droplets confined in narrow gaps between elastic surfaces induce capillary forces.
  • Droplet geometry significantly influences surface deformation and adhesion characteristics.
  • Understanding these interactions is crucial for micro- and nanofluidic applications.

Purpose of the Study:

  • To investigate the deformation of elastic bodies induced by a wetting droplet in a thin gap.
  • To quantify the relationship between droplet shape, gap geometry, and capillary adhesion.
  • To explore the phenomenon of spontaneous gap closure due to droplet volume increase.

Main Methods:

  • Experimental observation of droplet-induced deformation in confined elastic geometries.
  • Development of scaling laws to describe the relationship between key parameters.
  • Derivation of closed-form analytical solutions for surface deformation.
  • Application of variational techniques to analyze the stability and bifurcation of the system.

Main Results:

  • Wetting droplets cause elastic bodies to deflect inwards, increasing contact radius and adhesion.
  • Flat droplets, with high radius-to-gap height ratios, induce significantly larger deformations than sessile droplets.
  • Laplace pressure in flat droplets drives surface deformations orders of magnitude greater.
  • A critical point (bifurcation) exists where the gap spontaneously closes with increasing droplet volume.

Conclusions:

  • The geometry of wetting droplets in confined elastic systems dictates the magnitude of surface deformation and capillary adhesion.
  • The study provides a comprehensive framework, including experiments and analytical solutions, to understand this phenomenon.
  • The identified bifurcation highlights a potential instability leading to complete gap closure, relevant for micro-device design and failure analysis.