Related Experiment Video
Updated: Jul 30, 2026
06:42
Magnetically Induced Rotating Rayleigh-Taylor Instability
Published on: March 3, 2017
Rotational magnetic particles microrheology: the Maxwellian case.
C Wilhelm1, J Browaeys, A Ponton
1Fédération de Recherche, FR2438 Matière et Systèmes Complexes and Laboratoire des Milieux Désordonnés et Hétérogènes, Université Paris 6, Case 78, 4 Place Jussieu, 75252 Paris Cedex 05, France.
Summary
This study introduces a novel magnetic probe method to measure soft material viscoelasticity at the microscale. The technique uses magnetic particle chains to determine material properties globally or locally.
Area of Science:
- Materials Science
- Physics
- Rheology
Background:
- Measuring viscoelasticity of soft materials at microscopic scales is challenging.
- Existing methods may lack spatial resolution or sensitivity.
Purpose of the Study:
- To develop and validate a new experimental method for local viscoelasticity measurements.
- To utilize magnetic particle chains as probes for microrheology.
Main Methods:
- Employing rotational dynamics of magnetic probes (dipolar chains).
- Using light scattering for global microrheological measurements (0.001-100 Hz).
- Microscopic observation of chain rotation for local property determination.
Main Results:
- The method successfully measures local viscoelasticity of soft materials.
- Both global and local measurement techniques were validated.
- Accuracy demonstrated using a micellar Maxwellian solution.
Conclusions:
- The magnetic probe technique offers a versatile approach for microscale viscoelasticity assessment.
- This method provides both global and local insights into material behavior.
- Validated against theoretical predictions and experimental models.
More Related Videos
Related Concept Videos
01:11Angular Momentum: Rigid Body
The total angular momentum of a rigid body can be calculated using the summation of the angular momentum of all the tiny particles rotating in the same plane. Considering all the tiny particles rotating in the x-y plane, the direction of angular momentum of all such particles and that of the rigid body would be perpendicular to the plane of the rotation along the z-axis.
This calculation can get complicated when tiny particles within the rigid body are not rotating in the same plane but have...
This calculation can get complicated when tiny particles within the rigid body are not rotating in the same plane but have...
01:09Conservation of Angular Momentum
A system's total angular momentum remains constant if the net external torque acting on the system is zero. Considering a system that consists of n tiny particles, the angular momentum of any tiny particle may change, but the system's total angular momentum would remain constant. The principle of conservation of angular momentum only considers the net external torque acting on the system. While there are internal forces exerted by different particles within the system that also produce internal...
01:29Maxwell's Equation Of Electromagnetism
James Clerk Maxwell (1831–1879) was one of the major contributors to physics in the nineteenth century. Although he died young, he made major contributions to the development of the kinetic theory of gases, to the understanding of color vision, and to understanding the nature of Saturn's rings. He is probably best known for having combined existing knowledge on the laws of electricity and magnetism with his insights into a complete overarching electromagnetic theory, which is represented by...
01:28Symmetry in Maxwell's Equations
Once the fields have been calculated using Maxwell's four equations, the Lorentz force equation gives the force that the fields exert on a charged particle moving with a certain velocity. The Lorentz force equation combines the force of the electric field and of the magnetic field on the moving charge. Maxwell's equations and the Lorentz force law together encompass all the laws of electricity and magnetism. The symmetry that Maxwell introduced into his mathematical framework may not be...
01:23Maxwell's Thermodynamic Relations
Maxwell's thermodynamic relations are very useful in solving problems in thermodynamics. Each of Maxwell's relations relates a partial differential between quantities that can be hard to measure experimentally to a partial differential between quantities that can be easily measured. These relations are a set of equations derivable from the symmetry of the second derivatives and the thermodynamic potentials.
All thermodynamic potentials are exact differentials. Therefore, their second-order...
All thermodynamic potentials are exact differentials. Therefore, their second-order...
01:21Relation Between Moment of a Force and Angular Momentum
In the realm of spinning tops, the application of force at a distance from the center produces torque, a pivotal factor that alters the angular momentum of the top, thereby inducing its rotation. The concept of moment, akin to linear force in rotation, quantifies how a force acting upon an object initiates rotational motion. Angular momentum serves as the rotational counterpart to linear momentum, representing an object's inherent tendency to persist in its rotational state.
The temporal change...
The temporal change...