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Related Concept Videos

Excess Pressure Inside a Drop and a Bubble01:13

Excess Pressure Inside a Drop and a Bubble

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.
Pascal's Law01:04

Pascal's Law

In 1653, the French philosopher and scientist Blaise Pascal published "Treatise on the Equilibrium of Liquids," which discussed the principles of static fluids. A static fluid is a fluid that is not in motion. When a fluid is not flowing, we say that the fluid is in static equilibrium. If the fluid is water, we say it is in hydrostatic equilibrium. For a fluid in static equilibrium, the net force on any part of the fluid must be zero; otherwise, the fluid will start to flow. Pascal observed...
Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion03:48

Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion

Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
Accelerating Fluids01:17

Accelerating Fluids

When a fluid is in constant acceleration, the pressure and buoyant force equations are modified. Suppose a beaker is placed in an elevator accelerating upward with a constant acceleration, a. In the beaker, assume there is a thin cylinder of height h with an infinitesimal cross-sectional area, ΔS.
The motion of the liquid within this infinitesimal cylinder is considered to obtain the pressure difference. Three vertical forces act on this liquid:
Molecular Kinetic Energy01:21

Molecular Kinetic Energy

The word "gas" comes from the Flemish word meaning "chaos," first used to describe vapors by the chemist J. B. van Helmont. Consider a container filled with gas, with a continuous and random motion of molecules. During collisions, the velocity component parallel to the wall is unchanged, and the component perpendicular to the wall reverses direction but does not change in magnitude. If the molecule’s velocity changes in the x-direction, then its momentum is changed. During the short time of the...
Buoyancy01:12

Buoyancy

When an object is placed in a fluid, it either floats or sinks. All objects in a fluid experience a buoyant force. For example, a metal ball sinks, while a rubber ball floats. Similarly, a submarine can sink and float by adjusting its buoyancy.  The concept of buoyancy raises several interesting questions. For instance, where does this buoyant force come from? How much buoyant force is required to make an object sink or float? Do objects that sink get any support at all from the fluid? 
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Updated: Jul 2, 2026

Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
08:19

Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System

Published on: May 9, 2021

Particles driven up the wall by bursting bubbles.

Alex D Nikolov1, Darsh T Wasan

  • 1Department of Chemical and Biological Engineering, Illinois Institute of Technology, Chicago, IL 60616, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|August 14, 2008
PubMed
Summary
This summary is machine-generated.

Bubbling air-water interfaces with hydrophobic nanoparticles cause particles to climb vessel walls. A theoretical model explains this phenomenon, aligning with experimental data on particle-laden interfaces.

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A Microfluidic System with Surface Patterning for Investigating Cavitation Bubble(s)&#8211;Cell Interaction and the Resultant Bioeffects at the Single-cell Level
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A Microfluidic System with Surface Patterning for Investigating Cavitation Bubble(s)–Cell Interaction and the Resultant Bioeffects at the Single-cell Level

Published on: January 10, 2017

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Last Updated: Jul 2, 2026

Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
08:19

Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System

Published on: May 9, 2021

A Microfluidic System with Surface Patterning for Investigating Cavitation Bubble(s)&#8211;Cell Interaction and the Resultant Bioeffects at the Single-cell Level
11:14

A Microfluidic System with Surface Patterning for Investigating Cavitation Bubble(s)–Cell Interaction and the Resultant Bioeffects at the Single-cell Level

Published on: January 10, 2017

Area of Science:

  • Colloid and Surface Science
  • Fluid Dynamics
  • Nanotechnology

Background:

  • Bubbles bursting at liquid surfaces create dynamic phenomena.
  • Particle behavior at interfaces is crucial in various applications.
  • Hydrophobic nanoparticles exhibit unique interfacial properties.

Purpose of the Study:

  • To investigate the phenomenon of particles being driven up vessel walls by bursting bubbles.
  • To develop a theoretical model explaining particle transport at air-water interfaces.
  • To analyze the influence of liquid properties and particle wettability on this process.

Main Methods:

  • Experimental observation of particle movement driven by bursting bubbles.
  • Development of a theoretical model using lubrication theory.
  • Systematic variation of liquid viscosity, electrolyte strength, and particle wettability.

Main Results:

  • Observed particles climbing vessel walls due to surface pressure gradients from bursting bubbles.
  • Theoretical model accurately predicts particle climbing height and speed.
  • Demonstrated effects of liquid viscosity, electrolyte strength, and particle wettability on particle transport.

Conclusions:

  • Bursting bubbles at nanoparticle-laden interfaces can drive particle accumulation on surfaces.
  • The developed lubrication-based model provides a quantitative understanding of this interfacial transport.
  • Controlling interfacial properties is key to managing particle dynamics in such systems.