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Potential Due to a Polarized Object

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Polar Self-organization Of Ferroelectric Nematic-liquid-crystal Molecules On Atomically Flat Au(111) Surface.

Home
Research Domains
Chemical Sciences
Macromolecular And Materials Chemistry
Nanochemistry
Polar Self-organization Of Ferroelectric Nematic-liquid-crystal Molecules On Atomically Flat Au(111) Surface.

Related Experiment Video

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

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Published on: August 15, 2018

Polar Self-Organization of Ferroelectric Nematic-Liquid-Crystal Molecules on Atomically Flat Au(111) Surface.

Alexandr A Marchenko^1,2, Oleksiy L Kapitanchuk³, Yaroslava Yu Lopatina^1,2

¹Institute of Physics of the National Academy of Sciences of Ukraine, 46 Nauki Avenue, Kyiv 03028, Ukraine.

Physical Review Letters

|March 15, 2024

View abstract on PubMed

Summary

This summary is machine-generated.

Direct visualization of ferroelectric nematics reveals molecular self-assembly. Strongly polar molecules form ordered rows, exhibiting polar ferroelectric ordering at the nanoscale.

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Published on: March 24, 2019

Area of Science:

Materials Science
Condensed Matter Physics
Nanoscience

Background:

Ferroelectric nematics are a recently discovered class of liquid crystals exhibiting unique properties.
Understanding their nanoscale self-assembly mechanisms is crucial for harnessing their potential.
Direct visualization techniques are needed to study the behavior of strongly polar molecules.

Purpose of the Study:

To directly visualize the self-assembly of a ferroelectric nematic liquid crystal at the molecular level.
To investigate the nanoscale mechanisms underlying ferroelectric ordering in these materials.
To elucidate the structural characteristics of molecular monolayers on a conductive surface.

Main Methods:

Scanning tunneling microscopy (STM) was employed to study molecular monolayers.

Monomolecular layers of a ferroelectric nematic liquid crystal were prepared by solution deposition.

Experiments were conducted on a reconstructed Au(111) surface under ambient conditions.

Main Results:

Adsorbed ferroelectric nematic molecules self-assembled into regular rows with a tilted orientation.
The observed structure resembles a layered smectic C liquid crystal phase.
Each molecular dipole was consistently oriented in the same direction, confirming polar ferroelectric ordering.

Conclusions:

Direct visualization confirms the self-assembly of ferroelectric nematic molecules into ordered structures.
The study reveals nanoscale mechanisms leading to polar ferroelectric ordering in these liquid crystals.
The findings provide insights into the structural basis of ferroelectricity in nematic phases.