PMSE 32 |
| A variety of functional thin films can be produced using layer-by-layer (LbL) assembly. Thin films, typically < 1µm thick, are created by alternately exposing a substrate to positively- and negatively-charged molecules or particles in water. This deposition process is repeated until the desired number of “bilayers” (or cationic-anionic pairs) is achieved. Two functionalities, oxygen barrier films made with aluminosilicate (clay) platelets and magnetic thin films made with colloidal iron oxide, are described here. Films made with sodium montmorrilonite clay and cationic polyacrylamide, have a nano brick wall structure. Thirty bilayers of clay and polymer result in a 570 nm thick film with > 90% transparency and an oxygen transmission rate below 0.005 cm3/m2 • day. These thin, transparent composites are a good candidate for foil replacement in food packaging and flexible electronics packaging. Future work with these films for thin film capacitors will also be described. |
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Synthesis and Self-Assembly Approaches to Polymer-Inorganic Hybrid Nanoparticles
1:30 PM-4:50 PM, Sunday, April 6, 2008 Hilton New Orleans Riverside -- Grand Salon 24, Oral
Division of Polymeric Materials: Science & Engineering |