Free Space in Liquid Crystals-Molecular Design, Generation, and Usage

Area of Science:

• Materials Science
• Supramolecular Chemistry
• Organic Chemistry

Background:

• Designing materials with internal void space is crucial for applications like gas storage and catalysis.
• Traditionally, creating empty space in solid materials often leads to structural collapse.
• Liquid crystals (LCs), with their fluid nature and high molecular mobility, present a unique challenge and opportunity for generating and utilizing void space.

Purpose of the Study:

• To review the rational design of molecules for creating and utilizing void space in liquid crystals.
• To highlight how molecular design can lead to unconventional mesophases and functional materials.
• To explore strategies for filling intrinsic free space in LCs to stabilize structures and enable new applications.

Main Methods:

• Review of existing literature on void generation in liquid crystals.
• Analysis of molecular designs, including shuttlecock, discotic, and star mesogens.
• Investigation of guest molecule incorporation via supramolecular or covalent interactions, or physical mixing.

Main Results:

• Recent studies suggest the existence of pores or empty space in certain columnar liquid crystal mesophases.
• Rational molecular design, exemplified by shuttlecock and star mesogens, can lead to unconventional mesophases by efficient space filling.
• Incorporating guest molecules into the void space of LCs can stabilize the structure and prevent molecular scaffold deformation.

Conclusions:

• The rational design of molecules offers a pathway to create and control void space in liquid crystals.
• Filling this void space with guest molecules can lead to novel liquid crystalline materials with enhanced stability.
• This approach holds promise for the development of advanced organic electronic materials with tunable properties and device alignment capabilities.