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

Colloidal precipitates01:09

Colloidal precipitates

477
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...
477
Colloids03:22

Colloids

17.2K
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...
17.2K
Colloids and Suspensions01:17

Colloids and Suspensions

1.6K
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...
1.6K
Theories of Dissolution: Diffusion Layer Model01:15

Theories of Dissolution: Diffusion Layer Model

662
Dissolution, the process by which drug particles dissolve in a solvent, is explained by the diffusion layer model, a theoretical framework that simulates the absorption of oral drugs and allows us to analyze experimental data.
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...
662
Coagulation01:06

Coagulation

256
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...
256
Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

264
Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
264

You might also read

Related Articles

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

Sort by
Same author

General inverse-cube thickness scaling of projectile penetration energy in ultrathin films.

Proceedings of the National Academy of Sciences of the United States of America·2026
Same author

Modeling the slow Arrhenius process (SAP) in polymers.

Soft matter·2026
Same author

Turning non-superconducting elements into superconductors by quantum confinement and proximity.

Journal of physics. Condensed matter : an Institute of Physics journal·2026
Same author

Ionic glass formers show an inverted relation between fragility and non-exponential alpha-relaxation.

Nature communications·2026
Same author

Geometric indicators of local plasticity in glasses measured by scanning small-beam diffraction.

Acta crystallographica. Section A, Foundations and advances·2025
Same author

Quenching of long-wavelength non-equilibrium temperature fluctuations in a thermophilic colloidal suspension heated from below.

The Journal of chemical physics·2025
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: May 24, 2025

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

12.1K

Taming the diffusiophoretic convective instability in colloidal suspensions.

Stefano Castellini1, Carmine Anzivino1, Carlo Marietti1

  • 1Department of Physics "A. Pontremoli", University of Milan, via Celoria 16, 20133 Milan, Italy. alberto.vailati@unimi.it.

Soft Matter
|March 6, 2025
PubMed
Summary
This summary is machine-generated.

Convective instability in colloidal suspensions can be controlled by changing initial conditions. A high glycerol concentration threshold prevents diffusiophoretic convective instability (DCI), offering a new method to tame this phenomenon.

More Related Videos

Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

9.7K
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

10.3K

Related Experiment Videos

Last Updated: May 24, 2025

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

12.1K
Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

9.7K
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

10.3K

Area of Science:

  • Colloidal science
  • Fluid dynamics
  • Soft matter physics

Background:

  • Colloidal suspensions are typically stable against convection if density decreases with height.
  • A recent study revealed unexpected convective instability in uniformly dispersed colloidal particles due to diffusiophoresis.
  • This phenomenon, termed diffusiophoretic convective instability (DCI), is driven by solute gradients inducing particle motion.

Purpose of the Study:

  • To investigate the stability of colloidal suspensions against convection under varying initial conditions.
  • To explore the possibility of controlling DCI by altering the initial distribution of colloids and solutes.
  • To understand the role of initial conditions in the onset and behavior of diffusiophoretic convective instability.

Main Methods:

  • Experimental setup with localized initial conditions for colloid and solute.
  • Numerical solution of nonlinear double diffusion equations with diffusiophoretic coupling.
  • Analysis of the time evolution of the system's base state to determine stability thresholds.

Main Results:

  • Convective instability only develops when the glycerol concentration exceeds a significant threshold (approx. 0.3 w/w).
  • This threshold concentration effectively 'tames' DCI, preventing instability under specific initial conditions.
  • Colloidal particle interactions were found to be insignificant in the DCI phenomenon.

Conclusions:

  • Initial conditions play a crucial role in the stability of colloidal suspensions against DCI.
  • A high glycerol concentration threshold provides a method to control and prevent diffusiophoretic convective instability.
  • The findings offer new possibilities for managing convective phenomena in stratified colloidal systems.