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

Magnetic Damping01:17

Magnetic Damping

406
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
406
Negative Regulator Molecules01:23

Negative Regulator Molecules

35.1K
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
35.1K
Viscosity01:17

Viscosity

5.7K
When water is poured into a glass, it falls freely and quickly, whereas if honey or maple syrup is poured over a pancake, it flows slowly and sticks to the surface of the container. This difference in the flow of different kinds of liquids arises due to the fluid friction between the liquid layers and the liquid and the surrounding material. This property of fluids is called fluid viscosity. In this example, water has a lower viscosity than honey and maple syrup.
The SI unit of viscosity is...
5.7K
Diamagnetism01:26

Diamagnetism

2.4K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
2.4K
Conservation of Mass in Fixed, Nondeforming Control Volume01:07

Conservation of Mass in Fixed, Nondeforming Control Volume

833
The principle of conservation of mass is fundamental in fluid dynamics and is crucial for analyzing flow within fixed control volumes, such as pipes or ducts. This principle states that the total mass within a control volume remains constant unless altered by the inflow or outflow of mass through the control surfaces. This results in a vital relationship for steady, incompressible flow where the mass entering a system equals the mass leaving it.
In the case of a sewer pipe, which can be modeled...
833
Conservation of Mass in Moving, Nondeforming Control Volume01:14

Conservation of Mass in Moving, Nondeforming Control Volume

714
Stormwater detention basins are essential in managing runoff during heavy rainfall, particularly in urban areas where impervious surfaces increase the risk of flooding. Understanding the conservation of mass in these systems allows engineers to optimize basin performance, balancing inflow, outflow, and water storage.
In the context of a detention basin, the conservation of mass states that the total mass of water entering the basin must equal the mass leaving the basin plus any accumulation of...
714

You might also read

Related Articles

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

Sort by
Same author

Econophysics and the Landauer Principle: A Redefinition of Economic Temperature.

Entropy (Basel, Switzerland)·2026
Same author

Impact of Cold Radiofrequency Air Plasma Treatment on the Bulk Properties of Polypropylene Films.

Materials (Basel, Switzerland)·2026
Same author

Extreme Values and Convergence of the Voronoi Entropy for 2D Random Point Processes and for Long-Range Order.

Entropy (Basel, Switzerland)·2026
Same author

Negative Mass in the Systems Driven by Entropic Forces.

Materials (Basel, Switzerland)·2025
Same author

Landauer Principle and Einstein Synchronization of Clocks: Ramsey Approach.

Entropy (Basel, Switzerland)·2025
Same author

Landauer's Principle: Past, Present and Future.

Entropy (Basel, Switzerland)·2025

Related Experiment Video

Updated: May 20, 2025

Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
09:39

Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

Published on: June 28, 2024

797

Negative-Viscosity Materials: Exploiting the Effect of Negative Mass.

Edward Bormashenko1, Shraga Shoval2

  • 1Department of Chemical Engineering, Bio-Technology and Materials, Engineering Faculty, Ariel University, Ariel 407000, Israel.

Materials (Basel, Switzerland)
|March 27, 2025
PubMed
Summary

Researchers introduce novel gaseous and liquid media exhibiting negative viscosity, a property enabling negative mass effects. This is achieved by vibrating a plate through specialized core-shell meta-molecules above their resonant frequency.

Keywords:
Newtonian liquidcore–shell systemsdrag forcefrequencymetamaterialsnegative viscosityplasma oscillations

More Related Videos

Negative Additive Manufacturing of Complex Shaped Boron Carbides
06:45

Negative Additive Manufacturing of Complex Shaped Boron Carbides

Published on: September 18, 2018

8.6K
Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
13:44

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

15.3K

Related Experiment Videos

Last Updated: May 20, 2025

Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
09:39

Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

Published on: June 28, 2024

797
Negative Additive Manufacturing of Complex Shaped Boron Carbides
06:45

Negative Additive Manufacturing of Complex Shaped Boron Carbides

Published on: September 18, 2018

8.6K
Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
13:44

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

15.3K

Area of Science:

  • Physics
  • Materials Science
  • Rheology

Background:

  • The search for materials with negative viscosity is motivated by the potential to exploit the effect of negative mass.
  • Negative viscosity is a counterintuitive property that challenges conventional fluid dynamics.

Purpose of the Study:

  • To introduce and demonstrate a physical mechanism for achieving negative viscosity in gaseous and liquid media.
  • To explore the frequency dependence of viscosity and its asymptotic behavior.
  • To discuss potential applications of meta-materials exhibiting negative viscosity.

Main Methods:

  • Theoretical modeling of a vibrated plate interacting with core-shell meta-molecules in an ideal gas.
  • Analysis of momentum transfer and orientation relative to vibration frequency and resonant frequency.
  • Derivation of asymptotic expressions for frequency-dependent viscosity.

Main Results:

  • A novel physical mechanism for negative viscosity is introduced, occurring when vibration frequency exceeds the resonant frequency.
  • Negative viscosity is observed when the frequency of plate vibrations approaches the resonant frequency from above.
  • The effect is demonstrated to be possible in both gaseous and liquid media, with no violation of energy conservation.

Conclusions:

  • A new physical mechanism for negative viscosity has been established, offering a pathway to materials with negative mass properties.
  • The frequency dependence of viscosity has been analyzed, providing insights into material behavior under dynamic conditions.
  • Introduced meta-materials with negative viscosity can be utilized for developing fluids with tailored rheological characteristics.