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Related Experiment Video

Updated: Dec 24, 2025

Preparation of Nanoparticles for ToF-SIMS and XPS Analysis

Preparation of Nanoparticles for ToF-SIMS and XPS Analysis

Published on: September 13, 2020

Liquid-liquid coffee-ring effect.

Vincent Poulichet¹, Mathieu Morel¹, Sergii Rudiuk¹

¹PASTEUR, Department of Chemistry, Ecole Normale Supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France.

Journal of Colloid and Interface Science

|April 17, 2020

Summary

This summary is machine-generated.

The coffee-ring effect (CRE) can form without evaporation. Solvent transfer from a pinned drop to another liquid also causes solute accumulation at the contact line, forming a ring deposit.

Keywords:

Colloids Deposition Drop drying Liquid-liquid interface Sessile drop

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Area of Science:

Fluid dynamics
Materials science
Physical chemistry

Background:

The coffee-ring effect (CRE) is a common phenomenon observed in drying droplets.
It is typically characterized by solute deposition forming a ring at the droplet's edge.
Previously, CRE was thought to require both solvent evaporation and contact line pinning.

Purpose of the Study:

To investigate if the coffee-ring effect can occur without solvent evaporation.
To determine if solvent transfer into an external liquid medium can induce CRE.
To characterize the features of CRE formed via solvent transfer.

Main Methods:

Studied pinned sessile drops where the solvent transfers into an external liquid.
Observed solute transport and deposition patterns.
Analyzed particle organization and sorting at the contact line.

Main Results:

Demonstrated CRE formation solely through solvent transfer, without evaporation.
Observed characteristic CRE features: solute transport to the contact line, ring-shaped deposit, and particle organization/sorting.
Confirmed that the CRE mechanism is not limited to evaporative processes.

Conclusions:

The coffee-ring effect can be induced by solvent transfer into an immiscible liquid.
This expands the definition of CRE beyond evaporative phenomena.
The findings have implications for industrial processes and understanding solute deposition.