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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

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Stabilization of the mesomorphic phase in a self-assembled two-component system.

Yifeng Zhou¹, Miao Xu, Tingcheng Li

¹Department of Chemistry and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, China.

Journal of Colloid and Interface Science

|February 19, 2008

Summary

Two self-assembling molecules form liquid crystals and gels. Combining a trisurea with azobenzene groups and a trisamide core creates stable liquid-crystalline phases through cooperative hydrogen bonding.

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Area of Science:

Supramolecular chemistry
Materials science
Liquid crystal science

Background:

Self-assembling molecules are crucial for creating advanced materials.
Azobenzene-containing compounds exhibit unique photoresponsive liquid crystal properties.
Hydrogen bonding plays a key role in the formation of supramolecular structures.

Purpose of the Study:

To investigate the formation of lyotropic liquid crystals and liquid-crystalline physical gels.
To explore the synergistic effects of two distinct self-assembling building blocks.
To understand the mechanism of mesophase stabilization.

Main Methods:

Synthesis of C(3)-symmetrical trisureas with azobenzene groups.
Synthesis of a trisamide core molecule capable of hydrogen bonding.
Characterization of the mixture using infrared spectroscopy and small-angle X-ray scattering.

Main Results:

A C(3)-symmetrical trisurea component forms a liquid-crystal phase between 133-215°C.
A trisamide core component self-assembles into a fibrous network via hydrogen bonds.
The mixture of both components exhibits enhanced lyotropic liquid crystal and liquid-crystalline physical gel properties over a broader temperature range.

Conclusions:

Cooperative hydrogen bonding between the trisurea and trisamide components stabilizes the mesophase.
The combined system demonstrates tunable liquid-crystalline behavior.
This study presents a novel approach for designing advanced self-assembling materials.