Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Couette Flow

Couette Flow

Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...

Magnetostatic Boundary Conditions

Magnetostatic Boundary Conditions

An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the concentration...

Electrostatic Boundary Conditions

Electrostatic Boundary Conditions

Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
The surface integral of an electric field is given by Gauss's law in integral form and is related to...

Standing Waves in a Cavity

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

Viscosity of Fluid

Viscosity of Fluid

Viscosity measures the resistance a fluid offers to flow and deformation. It results from internal friction between layers of fluid moving relative to one another. Dynamic viscosity, denoted by the Greek letter mu (μ), quantifies the force needed to move one fluid layer over another. For Newtonian fluids like water and air, the relationship between the shearing stress and the rate of shearing strain is linear, meaning their viscosity remains constant regardless of the applied stress.

You might also read

Related Articles

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

Sort by

Same author

Entropic crystallization of Brownian squares through pathways governed by orientational dynamics.

Journal of colloid and interface science·2026

Same author

Realizing microrheological response of configurable viscoelastic media with a dynamic optical trap.

Soft matter·2026

Same author

Dominant Role of Electron-Electron Scattering in the Photoinduced Terahertz Conductivity Spectra of Few-Layer WS<sub>2(1-<i>x</i>)</sub>Se<sub>2<i>x</i></sub> Flakes.

ACS nano·2026

Same author

Giant Helicity-Dependent Second Harmonic Generation in Type-2 Weyl Semimetal.

Physical review letters·2026

Same author

Differential activity of nonmuscle myosin IIA and IIB isoforms generates a dynamic actomyosin network in a concentration-dependent manner.

The Journal of biological chemistry·2026

Same author

Reentrant melting of scarred odd crystals by self-shear.

Nature communications·2026

Search research articles

Related Experiment Video

Updated: Jun 1, 2026

Scanning SQUID Study of Vortex Manipulation by Local Contact

Scanning SQUID Study of Vortex Manipulation by Local Contact

Published on: February 1, 2017

Tunable Brownian vortex at the interface.

Manas Khan¹, A K Sood

¹Department of Physics, Indian Institute of Science, Bangalore 560012, India.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|May 24, 2011

Summary

This summary is machine-generated.

Researchers demonstrate Brownian vortices using colloidal particles at a liquid-air interface. External forces create circulatory motion from thermal fluctuations, offering a measure of interface dynamics.

More Related Videos

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

Published on: September 9, 2022

Preparation of Free-Surface Hyperbolic Water Vortices

Preparation of Free-Surface Hyperbolic Water Vortices

Published on: July 28, 2023

Related Experiment Videos

Last Updated: Jun 1, 2026

Scanning SQUID Study of Vortex Manipulation by Local Contact

Scanning SQUID Study of Vortex Manipulation by Local Contact

Published on: February 1, 2017

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

Published on: September 9, 2022

Preparation of Free-Surface Hyperbolic Water Vortices

Preparation of Free-Surface Hyperbolic Water Vortices

Published on: July 28, 2023

Area of Science:

Colloidal science
Soft matter physics
Fluid dynamics

Background:

Brownian motion describes random particle movement due to thermal energy.
Optical trapping is a technique to hold microscopic particles using focused laser beams.
Liquid-air interfaces exhibit unique interfacial phenomena and dynamics.

Purpose of the Study:

To demonstrate a general type of Brownian vortices.
To investigate the influence of external nonconservative forces on particle dynamics at interfaces.
To correlate vortex motion with interface fluctuations.

Main Methods:

Utilizing optical trapping to confine a colloidal particle at a liquid-air interface.
Applying an external nonconservative force field to induce particle motion.
Analyzing the resulting circulatory motion and thermal fluctuations of the particle.

Main Results:

Successfully demonstrated Brownian vortices in the colloidal system.
Observed that the drag force from a translating liquid medium induces circulatory motion.
Established a relationship between the angular velocity of the vortex and interface fluctuations.

Conclusions:

External forces can induce complex vortex dynamics from simple thermal fluctuations.
The angular velocity of induced vortices serves as a quantitative measure of interfacial fluctuations.
This system provides a model for studying vortex generation in confined environments.