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

Colloids and Suspensions01:17

Colloids and Suspensions

3.6K
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...
3.6K
Colloids03:22

Colloids

21.6K
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 that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
21.6K
Colloidal precipitates01:09

Colloidal precipitates

6.6K
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
6.6K
Viscosity of Fluid01:19

Viscosity of Fluid

1.4K
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.
1.4K
Paramagnetism01:30

Paramagnetism

3.1K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
3.1K
Coagulation01:06

Coagulation

1.5K
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
1.5K

You might also read

Related Articles

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

Sort by
Same author

Magnetically assisted trapping of passive colloids by active dipolar chain.

Physical review. E·2026
Same author

GRASPion: An open-source, programmable brainbot for active matter research.

The Review of scientific instruments·2026
Same author

Onsager variational principle for granular fluids.

Physical review. E·2024
Same author

Dipolar gels formed by aggregation of magnetized beads.

Physical review. E·2024
Same author

Droplet Helical Motion on Twisted Fibers.

Langmuir : the ACS journal of surfaces and colloids·2024
Same author

Collective dynamics of dipolar self-propelled particles.

Physical review. E·2023
Same journal

Therapeutic potential of crude protein extracts from two Egyptian freshwater snails Lanistes carinatus and Bellamya unicolor.

Scientific reports·2026
Same journal

Microbial contamination of donor corneas and post-keratoplasty endophthalmitis: a comparison between Japanese and U.S. eye banks using cold storage.

Scientific reports·2026
Same journal

Prevalence and contributing factors of virological non-suppression among adult patients on first-line antiretroviral therapy in tertiary hospitals in Ethiopia.

Scientific reports·2026
Same journal

An in vitro comparison of color stability between alkasite and different restorative materials in various staining solutions.

Scientific reports·2026
Same journal

Toward accessible mRNA LNP formulation: systematic evaluation of mixing strategies and key parameters.

Scientific reports·2026
Same journal

A network analysis of personality traits, mentalizing, and psychological health in Chinese college students.

Scientific reports·2026
See all related articles

Related Experiment Video

Updated: Feb 24, 2026

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
10:56

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 20, 2014

12.6K

Superparamagnetic colloids in viscous fluids.

A Darras1,2,3, E Opsomer4,5, N Vandewalle4

  • 1GRASP, CESAM - Physics Department, University of Liège, B-4000, Liège, Belgium. alexis.darras@ulg.ac.be.

Scientific Reports
|August 12, 2017
PubMed
Summary
This summary is machine-generated.

This study reveals how liquid viscosity affects superparamagnetic colloid aggregation dynamics. Lowering viscosity below a critical point triggers a new aggregation regime, significantly reducing simulation times.

More Related Videos

Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

10.5K
Meso-Scale Particle Image Velocimetry Studies of Neurovascular Flows In Vitro
08:00

Meso-Scale Particle Image Velocimetry Studies of Neurovascular Flows In Vitro

Published on: December 3, 2018

8.9K

Related Experiment Videos

Last Updated: Feb 24, 2026

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
10:56

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 20, 2014

12.6K
Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

10.5K
Meso-Scale Particle Image Velocimetry Studies of Neurovascular Flows In Vitro
08:00

Meso-Scale Particle Image Velocimetry Studies of Neurovascular Flows In Vitro

Published on: December 3, 2018

8.9K

Area of Science:

  • Colloid and Surface Science
  • Magnetohydrodynamics
  • Computational Physics

Background:

  • The aggregation dynamics of superparamagnetic colloids under magnetic fields are well-understood for short timescales.
  • However, the impact of parameters like liquid viscosity and long-term equilibrium states remain less explored.
  • Experimental data show discrepancies with analytical models under extreme conditions, and simulations are computationally intensive.

Purpose of the Study:

  • To investigate the influence of liquid viscosity on the aggregation kinetics of superparamagnetic colloids.
  • To identify and analyze new aggregation regimes at lower viscosities.
  • To explore methods for accelerating numerical simulations without altering physical behavior.

Main Methods:

  • Experimental measurements of aggregation processes across varying viscosities.
  • Numerical simulations of equivalent systems with reduced viscosities.
  • Analysis of aggregation dynamics and characteristic times.

Main Results:

  • Experimental results align with existing theories for transient aggregation behavior.
  • A critical viscosity threshold was identified, below which a distinct aggregation regime emerges.
  • Numerical simulations at lower viscosities confirm the transition and offer significant time reduction.

Conclusions:

  • Liquid viscosity is a crucial parameter influencing the characteristic aggregation time of superparamagnetic colloids.
  • The observed transition to a new aggregation regime at low viscosities provides a pathway to drastically reduce simulation times.
  • These findings suggest potential differences in the behavior of granular gases compared to colloidal liquids under high magnetic fields.