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Updated: Feb 15, 2026
06:24
High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
Published on: October 31, 2019
6.9K
Oscillating Chiral-Nematic Fingerprints Wipe Away Dust
Wei Feng1,2, Dirk J Broer1,2,3, Danqing Liu1,2,3
1Laboratory of Functional Organic Materials and Devices, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Den Dolech 2, 5612, AZ, Eindhoven, The Netherlands.
Advanced Materials (Deerfield Beach, Fla.)
|January 25, 2018
Summary
This study demonstrates creating dynamic surface undulations on organic coatings using electric fields. This controlled surface motion actively removes dust and debris, offering a novel dust control solution.
Area of Science:
- Materials Science
- Organic Electronics
- Surface Chemistry
Background:
- Chiral reactive mesogens can form ordered structures.
- Electric fields can influence the properties of liquid crystals.
- Surface topography affects material functionality.
Purpose of the Study:
- To develop a method for creating controllable mechanical undulations on solid organic coatings.
- To investigate the effect of electric fields on the surface morphology of chiral mesogen coatings.
- To explore the potential of these undulations for active surface cleaning applications.
Main Methods:
- Fabrication of organic coatings via polymerization of chiral reactive mesogens in a fingerprint alignment.
- Application of a lateral alternating electric field across interdigitated electrodes.
- Analysis of surface topography changes and dynamic behavior using microscopy and surface profilometry.
Main Results:
- The applied electric field reduced the order parameter of helicoidally packed mesogens, leading to surface height inversion and increased thickness.
- Chaotic and fast surface oscillations were observed, generating wavy deformation figures.
- The process was found to be fast, reversible, and capable of continuous surface undulation generation.
Conclusions:
- The electric-field-induced surface undulations provide a mechanism for sustained species transport.
- This active surface modulation effectively removes dust and debris, demonstrating potential for active dust control.
- The reversible and dynamic nature of the surface textures opens possibilities for responsive materials.
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