Self-Assembling Anti-Freezing Lamellar Nanostructures in Subzero Temperatures.

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Physical Chemistry

Background:

• Cryogenic self-assembly of amphiphiles in subzero environments presents significant challenges.
• Lyotropic liquid crystals (LLCs) are complex nanostructures sensitive to temperature variations.

Purpose of the Study:

• To investigate the cryogenic self-assembly of lamellar nanostructures at subzero temperatures.
• To understand the formation mechanism and microstructure of these self-assembled systems.
• To develop novel cryogenic materials for extreme environments.

Main Methods:

• Utilized ultra-long-chain surfactant stearyl diethanolamine (SDA) in a water/glycerol solvent.
• Investigated self-assembly at temperatures down to -70 °C.
• Employed comprehensive experimental and computational studies to analyze microstructure and formation.

Main Results:

• Successfully achieved self-assembly of lamellar nanostructures (LLCs) at -70 °C.
• Observed consecutive phase transitions: Lα (liquid-crystalline), Lβ (tilted), and a novel folded configuration.
• Identified the crucial roles of SDA's ultra-long alkyl chain and head group in lamellar formation.
• Demonstrated glycerol's role in creating an anti-freezing environment by remaining outside the lipid bilayer.

Conclusions:

• The study elucidates the mechanism of cryogenic supramolecular self-assembly in extreme conditions.
• Developed novel cryogenic materials with potential applications in extremely cold environments.
• Contributes to the theory and research methodology of self-assembly under extreme conditions.