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Traction Microscopy Integrated with Microfluidics for Chemotactic Collective Migration

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Published on: October 13, 2019

Charge gradient microscopy.

Seungbum Hong¹, Sheng Tong, Woon Ik Park

¹Materials Science Division and Nanoscience and Technology Division, Argonne National Laboratory, Lemont, IL 60439.

Proceedings of the National Academy of Sciences of the United States of America

|April 25, 2014

Summary

This summary is machine-generated.

Charge gradient microscopy (CGM) offers a fast method for imaging ferroelectric domains. This technique visualizes polarization charges in materials like lithium niobate, enabling high-speed domain imaging and potential use in energy harvesting.

Keywords:

atomic force microscopy charge scraping piezoresponse screen charge

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Ferroelectric materials possess spontaneous electric polarization.
Imaging polarization charges is crucial for understanding ferroelectric behavior.
Existing methods for domain imaging can be slow or lack resolution.

Purpose of the Study:

To introduce a simple, fast, and reliable method for imaging polarization charges.
To demonstrate the capability of charge gradient microscopy (CGM) for visualizing ferroelectric domains.

Main Methods:

Utilized charge gradient microscopy (CGM) with a grounded probe.
Collected current signals while scanning periodically poled lithium niobate and LiTaO3 thin films.
Analyzed displacement currents and surface charge dynamics at domain walls.

Main Results:

Successfully visualized ferroelectric domains and domain walls in lithium niobate and LiTaO3.
Achieved high-speed imaging at scan frequencies exceeding 78 Hz.
Demonstrated visualization over a 10 μm scale.

Conclusions:

CGM provides a reliable and efficient approach for high-speed ferroelectric domain imaging.
The technique is applicable to various ferroelectric materials.
Potential applications include advanced piezoelectric energy-harvesting devices.