Liquid crystallinity of carbon nanotubes

Area of Science:

• Materials Science
• Nanotechnology
• Liquid Crystals

Background:

• Carbon nanotubes (CNTs) exhibit liquid crystalline properties due to their high Young's modulus and inter-tube interactions.
• Splay defects in liquid crystalline CNTs can lead to low-order structures, but can be overcome by external fields or doping.
• CNTs possess unique electrical properties, including induced dipole moments and alignment in electric fields.

Purpose of the Study:

• To review the orientation characteristics and electrical behavior of liquid crystalline carbon nanotubes (CNTs).
• To explore the potential applications of CNTs in liquid crystal displays (LCDs).
• To highlight the advantages of using CNTs in various components of LCDs.

Main Methods:

• Recapitulation of CNT orientation characteristics and inherent properties.
• Description of CNT electrical behavior under electric fields.
• Review of CNT applications in LCDs, including dopants, electrodes, alignment layers, and polarizers.

Main Results:

• External fields and doping can improve the order of CNT assemblies by addressing splay defects.
• CNTs align with electric fields, minimizing dipolar energy and exhibiting desirable electrical anisotropy.
• CNTs offer complementary advantages as dopants, electrode replacements, alignment layers, and polarizers in LCDs.

Conclusions:

• Highly ordered CNT assemblies are critical for leveraging their exceptional axial properties.
• CNTs significantly enhance the performance of materials and devices in LCD applications.
• Further improvement in CNT ordering will drive the development of novel materials and applications.