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

2.1K
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...
2.1K
Colloids03:22

Colloids

17.8K
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 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...
17.8K
Diffusion01:12

Diffusion

196.7K
Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
196.7K
Colloidal precipitates01:09

Colloidal precipitates

731
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...
731
Coagulation01:06

Coagulation

361
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...
361
Ion Exchange01:17

Ion Exchange

642
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
642

You might also read

Related Articles

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

Sort by
Same author

Cystatin-C versus creatinine and kidney function in heart failure with preserved ejection fraction: a SOGALDI-PEF analysis.

The American journal of cardiology·2026
Same author

Correction: Description of new species of <i>Mycobacterium terrae</i> complex isolated from sewage at the São Paulo zoological park foundation in Brazil.

Frontiers in microbiology·2026
Same author

Excitability and Oscillations of Active Droplets.

Physical review letters·2026
Same author

Comparison of Surgical Outcomes and Perioperative Laboratory Parameters Following Minimally Invasive Plate Osteosynthesis versus Conventional Plating in Long Bone Fractures.

Journal of orthopaedic case reports·2026
Same author

Factors Influencing the Uptake of Digital Health Interventions for Cardiovascular Disease Prevention Among Healthcare Providers: A Systematic Review.

Global heart·2026
Same author

Polycythemia, SGLT2 inhibitors, and associated outcomes across the cardio-kidney-metabolic spectrum: a pooled analysis of randomized trials.

European journal of internal medicine·2026
Same journal

Erratum: Low-dimensional model for adaptive networks of spiking neurons [Phys. Rev. E 111, 014422 (2025)].

Physical review. E·2026
Same journal

Disentangling the effects of many-body forces on depletion interactions.

Physical review. E·2026
Same journal

Charge transport and mode transition in dual-energy electron beam diodes.

Physical review. E·2026
Same journal

Optimization of multisite reactions in complex compartmentalized media.

Physical review. E·2026
Same journal

Origin of geometric cohesion in nonconvex granular materials: Interplay between interdigitation and rotational constraints enhancing frictional stability.

Physical review. E·2026
Same journal

Interaction of walkers with a standing Faraday wave.

Physical review. E·2026
See all related articles

Related Experiment Video

Updated: Sep 1, 2025

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

7.3K

Active colloidal molecules in activity gradients.

Hidde D Vuijk1, Sophie Klempahn1, Holger Merlitz1,2

  • 1Leibniz-Institut für Polymerforschung Dresden, Institut Theory der Polymere, 01069 Dresden, Germany.

Physical Review. E
|August 17, 2022
PubMed
Summary
This summary is machine-generated.

Active colloidal dimers exhibit chemotaxis or antichemotaxis in activity gradients, depending on particle orientation. This research aids in designing self-adjusting active colloidal structures for targeted motion control.

More Related Videos

Generating Controlled, Dynamic Chemical Landscapes to Study Microbial Behavior
10:07

Generating Controlled, Dynamic Chemical Landscapes to Study Microbial Behavior

Published on: January 31, 2020

6.2K
Traction Microscopy Integrated with Microfluidics for Chemotactic Collective Migration
10:53

Traction Microscopy Integrated with Microfluidics for Chemotactic Collective Migration

Published on: October 13, 2019

7.1K

Related Experiment Videos

Last Updated: Sep 1, 2025

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

7.3K
Generating Controlled, Dynamic Chemical Landscapes to Study Microbial Behavior
10:07

Generating Controlled, Dynamic Chemical Landscapes to Study Microbial Behavior

Published on: January 31, 2020

6.2K
Traction Microscopy Integrated with Microfluidics for Chemotactic Collective Migration
10:53

Traction Microscopy Integrated with Microfluidics for Chemotactic Collective Migration

Published on: October 13, 2019

7.1K

Area of Science:

  • Soft matter physics
  • Statistical mechanics
  • Colloidal science

Background:

  • Active Brownian particles (ABPs) are fundamental units in non-equilibrium physics.
  • Colloidal dimers, assemblies of two particles, offer tunable properties for complex behaviors.
  • Activity gradients introduce spatial heterogeneity, influencing particle dynamics.

Purpose of the Study:

  • To analytically investigate the tactic behavior of active colloidal dimers in response to activity gradients.
  • To classify different dimer types based on their chemotactic and antichemotactic responses.
  • To explore the potential for enhanced motion persistence in these active structures.

Main Methods:

  • Analytical treatment of a rigid active colloidal dimer model.
  • Application of a coarse-grained Fokker-Planck approach.
  • Construction of a non-equilibrium phase diagram to map tactic behaviors.

Main Results:

  • Active dimers show orientation-dependent accumulation in high (chemotaxis) or low (antichemotaxis) activity regions.
  • Some dimers exhibit both behaviors, tunable by activity strength.
  • A non-equilibrium phase diagram effectively classifies dimer tactic responses.
  • Enhanced motion persistence, akin to a steering wheel effect, is observed for specific dimers.

Conclusions:

  • The orientation of active colloidal dimers dictates their response to activity gradients, enabling directed motion.
  • This work provides a framework for designing active colloidal systems with controllable self-propulsion and navigation.
  • The findings have implications for developing autonomous micro- and nanostructures for targeted applications.