Characterization of Modified DNA-Based Polymer Alignment Layers for Photonic Applications

Area of Science:

• Materials Science
• Biotechnology
• Liquid Crystal Displays

Background:

• Conventional alignment layers for liquid crystals often rely on petroleum-based polymers.
• There is a growing need for sustainable, cost-effective, and environmentally friendly alternatives in display technology.

Purpose of the Study:

• To create a novel, biodegradable alignment layer for liquid crystal molecules using DNA from fish waste and a cationic surfactant.
• To evaluate the optical and physical properties of this DNA-based alignment layer.
• To compare its performance with conventional alignment materials.

Main Methods:

• Synthesis of a DNA-surfactant complex (DNA-DODA) from fish waste and a cationic surfactant.
• Fabrication of alignment layers using the synthesized DNA-DODA.
• Characterization of alignment properties using atomic force microscopy, macroscopy, and polarizing optical microscopy.
• Evaluation of anchoring energy and response time in electro-optical effect studies.

Main Results:

• The DNA-DODA biopolymer effectively induces homeotropic alignment of nematic liquid crystals.
• Topography visualization confirmed uniform surface properties.
• Anchoring energy and response time were found to be comparable to commercial polyimide alignment layers.
• The material demonstrated excellent optical and physical properties, cost-effectiveness, and environmental benefits.

Conclusions:

• DNA-DODA serves as a promising, high-performance, and sustainable alternative to conventional alignment layers.
• This biopolymer facilitates the development of next-generation flexible, sustainable, and biocompatible optical devices.
• Utilizing fish waste for advanced materials offers a circular economy approach.