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Related Experiment Video

Updated: May 31, 2026

Forming, Confining, and Observing Microtubule-Based Active Nematics

Forming, Confining, and Observing Microtubule-Based Active Nematics

Published on: January 13, 2023

Post-Tanner spreading of nematic droplets.

S Mechkov¹, A M Cazabat, G Oshanin

¹Laboratoire de Physique Théorique de la Matière Condensée, Université Pierre et Marie Curie, 4 place Jussieu, 75252 Paris Cedex 5, France.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|July 1, 2011

Summary

Liquid crystal drops spread faster than predicted by the Tanner law due to unique substrate interactions. This study identifies a new post-Tanner spreading regime driven by nematic liquid crystal properties.

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Area of Science:

Physics
Materials Science
Physical Chemistry

Background:

The Tanner law describes quasistationary liquid drop spreading on solid substrates, typically governed by capillary forces for small droplets.
Nematic liquid crystals exhibit anomalous spreading behavior, deviating from the Tanner law at longer timescales.

Purpose of the Study:

To investigate the accelerated spreading of nematic liquid crystal drops beyond the Tanner law.
To model this phenomenon using a thin film approach, considering substrate-liquid interactions specific to nematics.

Main Methods:

Utilizing the thin film model (lubrication approximation) to describe droplet dynamics.
Numerically solving the thin film equation to simulate spreading behavior.
Comparing simulation results with experimental data for nematic liquid crystals.

Main Results:

The study identifies a transition to a faster spreading regime (R∼t(α), α > 1/10) for nematic liquid crystals.
Numerical solutions align well with experimental observations, validating the proposed model.
The accelerated spreading is attributed to strong substrate-liquid interactions, specifically antagonistic anchoring.

Conclusions:

The findings introduce a 'post-Tanner' stage in liquid drop spreading theory.
This regime is driven by nematic-specific interactions, complementing the standard capillarity-dominated model.
The spreading process can transition from capillary control to a diffusive film regime.