A research team from Rice University recently published a cover article in Langmuir, introducing a novel method to induce the formation of ordered liquid crystal phases of boron nitride nanotubes (BNNTs) in water using bile salt surfactants. This breakthrough offers innovative solutions for developing advanced functional materials in aerospace and electronics.

Led by AJ Hartsook Professor of Chemical and Biomolecular Engineering Matteo Pasquali, the team included first author Joe Khoury, who has a background in architecture. Khoury keenly observed during experiments: "When water was filtered from the BNNT dispersion, the remaining material glowed under polarized light, suggesting the formation of a liquid crystal phase." Building on this discovery, the team systematically studied the effect of sodium deoxycholate (SDC) surfactant concentration on BNNT self-assembly behavior.

The research achieved three key breakthroughs: First, the team successfully created the first comprehensive BNNT-surfactant phase diagram, providing a roadmap for predicting material behavior under varying concentration conditions. Second, they developed a simple and reliable thin-film preparation process, achieving well-aligned BNNT films through specialized blade shearing. Finally, they confirmed that the ordered alignment in the solution can be perfectly preserved in the solid-state material. Professor Pasquali emphasized: "This method requires no strong acids or harsh conditions, providing an ideal model system for studying liquid crystals of nanorods."

Experimental data showed that the resulting BNNT films exhibit excellent transparency and mechanical strength, demonstrating unique advantages in thermal management and structural reinforcement. These materials hold promise for applications in manufacturing lighter, more heat-resistant high-performance aerospace components and electronic devices. Khoury added: "Our approach is highly scalable, providing a new platform for next-generation functional nanomaterials."