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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...

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Updated: Nov 25, 2025

Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly

Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly

Published on: November 4, 2021

Ring patterns generated by an expanding colloidal meniscus.

V K Vlasko-Vlasov¹, M Sulwer², E V Shevchenko³

¹Materials Sciences Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.

Physical Review. E

|December 17, 2020

Summary

This summary is machine-generated.

Spatial confinement in toroidal droplets significantly impacts nanoparticle self-assembly during drying. This study reveals unique meniscus dynamics and ring formation patterns, improving control over periodic nanoparticle structures for advanced applications.

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Published on: February 22, 2018

Area of Science:

Materials Science
Nanotechnology
Physical Chemistry

Background:

Drop-and-dry methods are common for creating periodic nanoparticle (NP) structures.
Reproducibility and scalability challenges exist due to complex evaporation processes.

Purpose of the Study:

Investigate the effect of spatial confinement on NP self-assembly during slow solvent evaporation.
Analyze NP self-assembly in toroidal droplets formed by expanding contact lines.

Main Methods:

In situ video monitoring of contact line (CL) motion.
Analysis of hydrodynamic perturbations in the meniscus.
Comparison of toroidal and hemispherical droplet drying dynamics.

Main Results:

Observed regular hydrodynamic perturbations and quasiperiodic NP ring formation.
Found linear-in-time meniscus motion in toroidal drops, unlike the square root of time in hemispherical drops.
Demonstrated that ring width in toroidal drops decreases with increasing radius, contrary to hemispherical drops.

Conclusions:

Spatial confinement in toroidal droplets alters NP self-assembly dynamics.
Free ligands and contact line tension contribute to Marangoni instabilities, meniscus vorticity, and CL pinning, influencing ring formation.