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Related Experiment Video

Updated: Jun 23, 2026

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

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

Published on: May 15, 2017

The competition between the liquid-liquid dewetting and the liquid-solid dewetting.

Lin Xu¹, Tongfei Shi, Lijia An

¹State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China.

The Journal of Chemical Physics

|May 20, 2009

Summary

This summary is machine-generated.

We studied dewetting in polymer bilayers, observing two competing pathways: liquid-liquid and liquid-solid dewetting. Controlling polymer molecular weight, film thickness, and annealing temperature influences these dewetting behaviors.

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Area of Science:

Materials Science
Polymer Physics
Surface Science

Background:

Dewetting is a common phenomenon in thin films, crucial for understanding material behavior.
Bilayer polymer films exhibit complex dewetting dynamics influenced by interfacial properties.

Purpose of the Study:

Investigate the competing dewetting pathways in an air/polystyrene/polymethyl methacrylate bilayer on a silanized silicon wafer.
Determine the key factors controlling the competition between liquid-liquid and liquid-solid dewetting.

Main Methods:

Experimental observation of dewetting in polymer bilayers.
Analysis of hole formation time and dewetting velocity.
Systematic variation of polymer molecular weight, film thickness, and annealing temperature.

Main Results:

Identified two competing dewetting pathways: liquid-liquid (upper layer on lower) and liquid-solid (bilayer on substrate).
Hole formation time and dewetting velocity are critical factors influencing pathway competition.
Liquid-liquid interfacial tension, film thickness, and viscosity impact hole formation and dewetting velocity.
Rim growth on the substrate occurs via a rolling mechanism during hole growth.

Conclusions:

The competition between liquid-liquid and liquid-solid dewetting can be controlled by adjusting polymer molecular weight, film thickness, and annealing temperature.
Understanding these dewetting mechanisms is vital for designing and fabricating polymer-based devices.