On 19 November 2025, KIST and KAIST researchers reported a high-density boron nitride nanotube (BNNT) film fabricated from surfactant-stabilized liquid crystals. The film was more than three times denser than earlier brittle BNNT sheets, delivered approximately 3.7 times greater neutron-shielding performance, and retained flexibility and mechanical strength. Joint NASA simulations found approximately 15% higher radiation-shielding efficiency than aluminum at equal mass thickness, with particular effectiveness against thermal and secondary neutrons. The work was published in Advanced Functional Materials under DOI 10.1002/adfm.202510716.[1][3]
The result is strategically relevant because lunar shielding must control galactic cosmic rays, solar-particle events, and secondary neutrons without imposing prohibitive launch mass. BNNT film could serve as a conformal layer on pressure vessels, rover cabins, habitat walls, spacesuits, or protected data repositories while also transferring heat; simulations reported that a 50 g/cm² film reduced total dose-equivalent rate by 56% relative to zero shielding.[6] However, the evidence is currently simulation-based rather than flight-qualified, and performance depends on thickness, radiation spectrum, manufacturing quality, hydrogenous backing, and protection against micrometeoroids and abrasion.
The Ark team should establish a BNNT qualification programme: reproduce the reported 50 g/cm² configuration; test proton, heavy-ion, gamma, and neutron spectra representative of lunar orbit and the surface; compare pure BNNT film with aluminum-BNNT, polyethylene-BNNT, water, regolith, and boron-10-enriched laminates; and measure thermal conductivity, tensile strength, outgassing, vacuum durability, radiation aging, dust contamination, and repairability. Prioritize layered architectures rather than aluminum alone, since boron-containing materials can suppress secondary-neutron backscatter, and require coupon testing followed by a lunar-demonstration payload before integrating BNNT into permanent Ark structures.[1][7]