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Updated: Dec 18, 2025

Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations

Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations

Published on: August 21, 2018

Polymeric liquid layer densified by surface acoustic wave.

Tianhao Hou¹, Jingfa Yang¹, Wen Wang²

¹Beijing National Research Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.

The Journal of Chemical Physics

|June 15, 2020

Summary

This summary is machine-generated.

High frequency surface acoustic waves (SAW) densify liquid polymeric thin films. This process reduces film thickness and molecular motion, creating more stable amorphous materials.

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Area of Science:

Materials Science
Polymer Physics
Acoustics

Background:

Creating stable amorphous materials is crucial for advanced applications.
Densification of liquid polymers can enhance material properties.
Surface acoustic waves (SAW) offer a non-invasive method to influence material properties.

Purpose of the Study:

To investigate the effect of high-frequency surface acoustic waves (SAW) on liquid polymeric thin films.
To determine if SAW can induce densification and alter the dynamics of polymer films.
To explore the potential of SAW for fabricating stable amorphous materials.

Main Methods:

Fabrication of polyisobutylene thin films on solid substrates.
Application of high-frequency (39.5 MHz) surface acoustic waves (SAW).
Measurement of film thickness and refractive index using ellipsometry.
Analysis of molecular rotational motion and dynamical heterogeneity using polarization-resolved single molecule fluorescence microscopy.

Main Results:

A decrease in polyisobutylene thin film thickness was observed under SAW application.
An increase in the refractive index of the polymer films was measured.
SAW application led to retarded rotational motion of fluorescent probes within the film.
Reduced dynamical heterogeneity was observed in the polymer films subjected to SAW.

Conclusions:

High-frequency SAW effectively densifies liquid polymeric thin films.
SAW application enhances the dynamic homogeneity of polymer films.
This technique provides a novel route for producing ultra-stable amorphous polymeric materials.