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Related Concept Videos

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In a fluid at rest, the pressure at any point beneath the fluid surface depends solely on the depth, not on the container's shape or size. This principle, known as hydrostatic pressure, arises because, in stationary fluids, there is no acceleration, meaning the forces within the fluid balance out. Only vertical forces, caused by the weight of the fluid above, contribute to pressure changes with depth.
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The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
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In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
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Fluid pressure is commonly measured using devices called manometers, which rely on liquid columns to indicate pressure differences. The height of a liquid column in a manometer reflects the pressure exerted by the fluid, providing a simple yet effective means of measurement. Different types of manometers serve specific purposes based on their configurations and the type of fluids involved.
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[Experimental study on the relationship between foam pressure difference and foam stability].

Taoping Bai1, Jiche Liu1,2, Wentao Jiang1

  • 1Provincial Key Laboratory of Biomechanical Engineering, Sichuan University, Chengdu 610065, P. R. China.

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi = Journal of Biomedical Engineering = Shengwu Yixue Gongchengxue Zazhi
|May 6, 2022
PubMed
Summary

Foam stability in sclerotherapy is improved by reducing foam pressure. Poloxamer 188 concentration affects foam pressure, with lower pressure indicating better foam stability for improved treatment efficacy.

Keywords:
Foam half-lifeFoam pressure differenceFoam stabilityVaricose veins

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Area of Science:

  • Pharmaceutical Sciences
  • Biomaterials Science
  • Medical Device Engineering

Background:

  • Foam stability is critical for the effectiveness and safety of foam sclerotherapy.
  • Understanding the link between foam pressure and stability can lead to improved foam formulations.

Purpose of the Study:

  • To investigate the relationship between foam pressure difference and foam stability indicators.
  • To determine the optimal concentration of poloxamer 188 for stable sodium cod liver oleate foam.

Main Methods:

  • Sodium cod liver oleate foam was prepared with varying concentrations of poloxamer 188 (0%, 4%, 8%, 12%).
  • Foam pressure difference and stability (water separation rate, half-life) were analyzed using image processing software.
  • The impact of additive concentration on foam pressure and stability was evaluated.

Main Results:

  • Foam pressure peaked at 4% poloxamer 188 concentration, then decreased.
  • Foam pressure difference decreased with increasing decay time.
  • Lower foam pressure difference correlated with enhanced foam stability, particularly at optimal poloxamer 188 concentrations.

Conclusions:

  • Foam pressure difference is a key indicator of foam stability in sclerotherapy.
  • Optimizing poloxamer 188 concentration can modulate foam pressure and improve stability.
  • This research provides a foundation for developing more stable foam hardeners for medical applications.