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Colloids

Colloids

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...

Colloidal precipitates

Colloidal precipitates

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...

Colloids and Suspensions

Colloids and Suspensions

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...

Coagulation

Coagulation

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...

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Related Experiment Video

Updated: Jun 23, 2025

Fabrication of Zero Mode Waveguides for High Concentration Single Molecule Microscopy

Fabrication of Zero Mode Waveguides for High Concentration Single Molecule Microscopy

Published on: May 12, 2020

Ring-shaped colloidal patterns on saline water films.

Michiel A Hack¹, Marjolein N van der Linden², Herman Wijshoff³

¹Physics of Fluids Group, Max Planck Center Twente for Complex Fluid Dynamics, Faculty of Science and Technology, University of Twente, P.O. Box 217, Enschede, 7500 AE, the Netherlands.

Journal of Colloid and Interface Science

|June 21, 2024

Summary

This summary is machine-generated.

Colloidal particle clusters form trapezoidal shapes when a drop spreads on a saline film. This pattern arises from the interplay of fluid dynamics and particle aggregation, relevant for inkjet printing.

Keywords:

Colloids Drops Marangoni flow Pattern formation Spreading Thin films

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Related Experiment Videos

Last Updated: Jun 23, 2025

Fabrication of Zero Mode Waveguides for High Concentration Single Molecule Microscopy

Fabrication of Zero Mode Waveguides for High Concentration Single Molecule Microscopy

Published on: May 12, 2020

Modulating Shape of Polyester Based Polymersomes using Osmotic Pressure

Modulating Shape of Polyester Based Polymersomes using Osmotic Pressure

Published on: April 21, 2021

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 20, 2014

Area of Science:

Colloid and Surface Science
Fluid Dynamics
Materials Science

Background:

Electrostatically stabilized colloidal particles destabilize upon contact with cations, leading to aggregation.
The interplay between fluid mechanics and physicochemical properties governs the spreading dynamics of colloidal drops on ionic liquid films.

Purpose of the Study:

To investigate the spreading dynamics and cluster formation of colloidal particles on a cation-containing liquid film.
To elucidate the factors influencing the morphology of colloidal aggregates during drop spreading.

Main Methods:

High-speed imaging was employed to capture the dynamic evolution of the spreading drop.
Digital holographic microscopy was utilized to characterize the structure of the colloidal particle clusters.

Main Results:

Depositing a colloidal drop onto a thin saline film results in a ring-shaped spreading pattern.
Colloidal particles aggregate into distinct trapezoidally-shaped structures termed 'supraclusters'.
A simple model demonstrates that the trapezoidal supracluster shape is dictated by the transition from inertial spreading to Marangoni flow.

Conclusions:

The study reveals a novel aggregation pattern of colloidal particles driven by fluid-mechanical and physicochemical interactions.
The findings offer insights into phenomena relevant to applications like wet-on-wet inkjet printing, where simultaneous particle destabilization and hydrodynamic flow are critical.