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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

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Quantitative spreading kinetics of a three molecular layer liquid patch.

Olivier Noel¹, Jean-Luc Buraud, Laurent Berger

¹Laboratoire de Physique de l'Etat Condensé, Molecular landscapes and biophotonics group, Université du Maine, Avenue Olivier Messiaen, 72000 Le Mans, France.

Langmuir : the ACS Journal of Surfaces and Colloids

|March 23, 2010

Summary

Investigating smectic nanodrop spreading on solid surfaces revealed limitations in existing theories. A new model accurately describes this process as quasi-static, driven by surface interactions and pressure.

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Area of Science:

Materials Science
Surface Science
Physical Chemistry

Background:

Understanding the late-stage kinetics of nanodrop spreading on solid surfaces is crucial for applications in nanotechnology and materials science.
Existing theories for liquid spreading often fail to accurately describe the behavior of stratified liquids like smectic nanodrops.
Direct, real-time imaging is essential for capturing the dynamic processes involved in nanodrop spreading.

Purpose of the Study:

To investigate the late-stage spreading kinetics of a smectic nanodrop on a solid surface.
To compare experimental findings with existing theoretical models.
To develop a new model that accurately describes the observed spreading behavior.

Main Methods:

Utilized Scanning Electron Energy-Loss Spectroscopy (SEEC) microscopy for direct and real-time imaging.
Focused on a three molecular layer patch of the smectic nanodrop.
Collected and analyzed experimental data on the spreading kinetics.

Main Results:

Experimental data did not conform to the existing theory for weakly stratified liquids.
A new theoretical model was developed based on the experimental observations.
The new model demonstrated remarkable agreement with the experimental data.

Conclusions:

The spreading of smectic nanodrops on solid surfaces is a complex process not fully explained by current theories.
A novel quasi-static model, incorporating solid/liquid interactions, 2D Laplace pressure, and distinct edge/surface permeation coefficients, accurately predicts the observed kinetics.
This new model provides a more accurate framework for understanding and predicting the behavior of smectic nanodrops in surface interactions.