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

Viscosity01:17

Viscosity

5.8K
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...
5.8K
Types of Fluids01:27

Types of Fluids

234
Fluids can be classified into Newtonian and non-Newtonian fluids based on their response to shear stress. Newtonian fluids have a linear relationship between shear stress and the shear strain rate, following Newton's law of viscosity. Their viscosity remains constant regardless of the shear rate, making their behavior predictable and easier to analyze. Common examples include water, air, oil, and gasoline.
In contrast, non-Newtonian fluids do not follow Newton's law of viscosity, and...
234
Pleural Effusion I: Introduction01:25

Pleural Effusion I: Introduction

871
Pleural effusion is an abnormal fluid accumulation in the pleural cavity, a narrow space between the lungs and the chest wall. It is not a disease per se but rather a symptom or indication of an underlying disease. In normal circumstances, this space contains a small amount of fluid (5 to 15 mL), a lubricant facilitating the non-frictional movement of the pleural surfaces.
There are two main types of pleural effusion: transudative and exudative. They are differentiated using Light's...
871
Characteristics of Fluids01:31

Characteristics of Fluids

312
Fluids differ from solids primarily in their molecular structure and stress response. Solids have tightly packed molecules with strong intermolecular forces, maintaining their shape and resisting deformation. In contrast, fluids have molecules spaced farther apart with weaker forces, allowing them to flow and deform easily.
Fluids, which include both liquids and gases, are substances that deform continuously under shearing stress. For example, water and oil are liquids with molecules that can...
312
Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

27.7K
Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
27.7K
Colloids and Suspensions01:17

Colloids and Suspensions

1.8K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
1.8K

You might also read

Related Articles

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

Sort by
Same author

Machine-learning-derived protocols for information-based work extraction from active particles.

Physical review. E·2026
Same author

Sound attenuation in glasses.

The Journal of chemical physics·2025
Same author

The origin of sound damping in amorphous solids: Defects and beyond.

Science advances·2025
Same author

Self-consistent theory for sound propagation in a simple model of a disordered, harmonic solid.

Physical review. E·2025
Same author

Defects, Sound Damping, and the Boson Peak in Amorphous Solids.

The journal of physical chemistry. B·2025
Same author

Simple Fluctuations in Simple Glass Formers.

The journal of physical chemistry. B·2024
Same journal

Nanopore sequencing with proteins: synchronization and dischronization of molecular dynamics simulations with laboratory and industrial developments.

Soft matter·2026
Same journal

Catanionics from biosurfactants and regular surfactants: miscibility and structure.

Soft matter·2026
Same journal

Adhesives with a thickness smaller than the fractocohesive length enhance adhesion.

Soft matter·2026
Same journal

Non-equilibrium phase transitions in hybrid Voronoi models of cell colonies.

Soft matter·2026
Same journal

Effects of methoxy substituents on self-assembly and gelation performance of benzamide-based organogelators.

Soft matter·2026
Same journal

Rheology of <i>Escherichia coli</i> suspensions with various bacterial morphologies and motion characteristics.

Soft matter·2026
See all related articles

Related Experiment Video

Updated: Jun 23, 2025

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

Forming, Confining, and Observing Microtubule-Based Active Nematics

Published on: January 13, 2023

2.6K

Extremely persistent dense active fluids.

Grzegorz Szamel1, Elijah Flenner1

  • 1Department of Chemistry, Colorado State University, Fort Collins, CO, USA. grzegorz.szamel@colostate.edu.

Soft Matter
|June 21, 2024
PubMed
Summary
This summary is machine-generated.

Dense active particle systems with long persistence times show dynamics independent of persistence. Their properties exhibit power-law dependencies on self-propulsion force, suggesting a new class of extremely persistent active systems.

More Related Videos

Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure
08:02

Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure

Published on: April 17, 2018

10.4K
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

7.2K

Related Experiment Videos

Last Updated: Jun 23, 2025

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

Forming, Confining, and Observing Microtubule-Based Active Nematics

Published on: January 13, 2023

2.6K
Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure
08:02

Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure

Published on: April 17, 2018

10.4K
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

7.2K

Area of Science:

  • Physics
  • Soft Matter Physics
  • Active Matter Physics

Background:

  • Dense systems of active particles are crucial for understanding biological and synthetic systems.
  • Previous research explored extremely persistent systems, with relaxation times dependent on persistence time (τp).
  • This study investigates the fluid counterparts of these systems under constant self-propulsion force (f).

Purpose of the Study:

  • To analyze the dynamics of dense three-dimensional active particle systems for large persistence times (τp).
  • To determine the influence of persistence time and self-propulsion force on system dynamics.
  • To identify if these systems represent a new class of extremely persistent active matter.

Main Methods:

  • Simulations of dense three-dimensional active particle systems.
  • Analysis of dynamic properties including mean-squared velocity, self-intermediate scattering function, and shear-stress correlation function.
  • Investigation across a range of large persistence times (τp) and constant self-propulsion forces (f).

Main Results:

  • Many dynamic properties become independent of persistence time (τp) in the large τp limit.
  • Key properties like mean-square velocity and relaxation times exhibit power-law dependencies on self-propulsion force (f) with non-trivial exponents.
  • Shear-stress correlation functions also show τp-independent behavior and power-law dependence on f.

Conclusions:

  • Dense active particle systems with large persistence times exhibit unique dynamic behaviors.
  • These behaviors, including τp-independence and power-law force dependence, suggest a distinct class of active matter.
  • The findings contribute to understanding the fundamental dynamics of persistent active systems.