Exceptional Flame Resistance and Gas Barrier with Thick Multilayer Nanobrick Wall Thin Films Academic Article uri icon

abstract

  • Layerbylayer (LbL) assembly is a powerful and versatile technique to deposit functional thin films, but often requires a large number of deposition steps to achieve a film thick enough to provide a desired property. By incorporating amine salts into the cationic polyelectrolyte and its associated rinse, LbL claycontaining nanocomposite films can achieve much greater thickness (>1 m) with relatively few deposition cycles (6 bilayers). Amine salts interact with nanoclays, causing nanoplatelets to deposit in stacks rather than as individual platelets. This technique appears to be universal, exhibiting thick growth with multiple types of nanoclay, including montmorillonite and vermiculite (VMT), and a variety of amine salts (e.g., hexylamine and diethanolamine). The characteristic order found in LbLassembled films is maintained despite the incredible thickness. Films assembled in this manner achieve oxygen transmission rates below 0.009 cc m2 d1 atm1 with just 6 bilayers (BLs) of chitosan/VMT deposited. These thick claybased thin films also impart exceptional flame resistance. A 2BL film renders a 3.2 mm polystyrene plate selfextinguishing, while an 8BL film (3.9 m thick) prevents ignition entirely. This ability to generate much thicker claybased multilayers with amine salts opens up tremendous potential for these nanocoatings in real world applications.

published proceedings

  • ADVANCED MATERIALS INTERFACES

altmetric score

  • 14

author list (cited authors)

  • Guin, T., Krecker, M., Milhorn, A., Hagen, D. A., Stevens, B., & Grunlan, J. C.

citation count

  • 44

complete list of authors

  • Guin, Tyler||Krecker, Michelle||Milhorn, Aaron||Hagen, David A||Stevens, Bart||Grunlan, Jaime C

publication date

  • July 2015

publisher