Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

563
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
563
Dimensionless Groups in Fluid Mechanics01:15

Dimensionless Groups in Fluid Mechanics

597
Dimensionless groups in fluid mechanics provide simplified ratios that help analyze fluid behavior without relying on specific units. The Reynolds number (Re), which represents the ratio of inertial to viscous forces, distinguishes between laminar and turbulent flows, making it essential in the design of pipelines and aerodynamic surfaces. The Froude number (Fr), the ratio of inertial to gravitational forces, is particularly useful in predicting wave formation and hydraulic jumps in...
597
Steady, Laminar Flow in Circular Tubes01:23

Steady, Laminar Flow in Circular Tubes

663
Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is purely axial,...
663
Dynamics of Circular Motion01:30

Dynamics of Circular Motion

20.7K
An object undergoing circular motion, like a race car, is accelerating because it is changing the direction of its velocity. This centrally directed acceleration is called centripetal acceleration. This acceleration acts along the radius of the curved path (thus is also referred to as radial acceleration).
Any acceleration must be produced by some force. Therefore, any force or combination of forces can cause centripetal acceleration. A few examples include the tension in the rope on a...
20.7K
Angular Momentum: Single Particle01:10

Angular Momentum: Single Particle

7.0K
Angular momentum is directed perpendicular to the plane of the rotation, and its magnitude depends on the choice of the origin. The perpendicular vector joining the linear momentum vector of an object to the origin is called the “lever arm.” If the lever arm and linear momentum are collinear, then the magnitude of the angular momentum is zero. Therefore, in this case, the object rotates about the origin such that it lies on the rim of the circumference defined by the lever arm...
7.0K
Stokes' Law01:20

Stokes' Law

2.2K
Viscous forces, like friction, are intermolecular forces that resist the relative motion of molecules over each other. When a solid body moves through a liquid, viscous forces drag it in the opposite direction. The force's magnitude depends on the solid's shape and size, as well as its speed and the liquid's coefficient of viscosity, density and temperature.
The expression for the force on a solid spherical object in a fluid is called Stokes' law. Stokes' law is valid only...
2.2K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Whisky-Inspired Active Matter.

ACS applied materials & interfaces·2026
Same author

Radical antegrade modular pancreatosplenectomy versus conventional left pancreatectomy for pancreatic cancer: study protocol for the multicentre randomized clinical RAMPS trial.

BJS open·2026
Same author

Navigating Gravity: Competing Effects Result in Opposing Taxis for Different Janus Swimmers.

Small (Weinheim an der Bergstrasse, Germany)·2025
Same author

Buffon's Brownian needles: harnessing thermal motion for stochastic sampling.

Soft matter·2025
Same author

Perspective on Interdisciplinary Approaches on Chemotaxis.

Angewandte Chemie (International ed. in English)·2025
Same author

Technology Roadmap of Micro/Nanorobots.

ACS nano·2025

Related Experiment Video

Updated: Nov 14, 2025

Controlling Flow Speeds of Microtubule-Based 3D Active Fluids Using Temperature
08:04

Controlling Flow Speeds of Microtubule-Based 3D Active Fluids Using Temperature

Published on: November 26, 2019

7.4K

Active spheres induce Marangoni flows that drive collective dynamics.

Martin Wittmann1, Mihail N Popescu2, Alvaro Domínguez3,4

  • 1Technical University Dresden, Zellescher Weg 19, 01069, Dresden, Germany.

The European Physical Journal. E, Soft Matter
|March 8, 2021
PubMed
Summary

Chemically active particles at fluid interfaces can exhibit collective motion via Marangoni flow, even without self-propulsion. Adding surfactant to these particle monolayers induced observable collective dynamics, influenced by particle density.

More Related Videos

Forming, Confining, and Observing Microtubule-Based Active Nematics
08:37

Forming, Confining, and Observing Microtubule-Based Active Nematics

Published on: January 13, 2023

3.0K
An Orbital Shaking Culture of Mammalian Cells in O-shaped Vessels to Produce Uniform Aggregates
05:40

An Orbital Shaking Culture of Mammalian Cells in O-shaped Vessels to Produce Uniform Aggregates

Published on: January 7, 2019

9.8K

Related Experiment Videos

Last Updated: Nov 14, 2025

Controlling Flow Speeds of Microtubule-Based 3D Active Fluids Using Temperature
08:04

Controlling Flow Speeds of Microtubule-Based 3D Active Fluids Using Temperature

Published on: November 26, 2019

7.4K
Forming, Confining, and Observing Microtubule-Based Active Nematics
08:37

Forming, Confining, and Observing Microtubule-Based Active Nematics

Published on: January 13, 2023

3.0K
An Orbital Shaking Culture of Mammalian Cells in O-shaped Vessels to Produce Uniform Aggregates
05:40

An Orbital Shaking Culture of Mammalian Cells in O-shaped Vessels to Produce Uniform Aggregates

Published on: January 7, 2019

9.8K

Area of Science:

  • Physical Chemistry
  • Soft Matter Physics
  • Fluid Dynamics

Background:

  • Chemically active particles at fluid interfaces can generate collective dynamics.
  • Activity-induced Marangoni flow is a key mechanism, even for non-self-propelled particles.

Purpose of the Study:

  • To experimentally investigate collective dynamics in chemically active particle monolayers.
  • To test the prediction of activity-induced Marangoni flow in non-self-propelled systems.
  • To explore the role of surfactants in mediating particle interactions and collective motion.

Main Methods:

  • Utilized a monolayer of spherically symmetric active particles at an oil-water interface.
  • Varied conditions by including or excluding a nonionic surfactant.
  • Observed particle behavior and collective motion under photochemical fuel degradation gradients.

Main Results:

  • Collective motion emerged in the presence of surfactant.
  • The observed dynamics were dependent on particle coverage (density) of the monolayer.
  • Gradients from photochemical fuel degradation induced long-ranged Marangoni flows.

Conclusions:

  • Confirms that chemically active, non-self-propelled particles can exhibit collective motion at fluid interfaces.
  • Demonstrates the crucial role of surfactants in enabling collective dynamics through Marangoni flow.
  • Highlights the influence of particle density on emergent collective behaviors.