Activity: Talk or presentation › Oral presentation
Layered materials find many applications in electronics, coatings or lubrication. One example are titanium oxide nanosheets, which can be obtained through the exfoliation of protonated layered titanates with lepidocrocite-like structures (H1.07Ti1.73O4). Layered titanates are constituted by negatively charged oxide layers that can be intercalated by a wide range of cations. Here, they were functionalized with linear alkylamines. The amines are weak bases that react with the protons of the layered host. This reaction is the driving force for molecular intercalation and swelling of the layered structure. Small Angle X-ray Scattering was performed to investigate the dynamic swelling and exfoliation behavior of these layered systems in aqueous solution. The ratios of amine to layered host and the carbon chain length were varied. Layered compounds find an important application in lubrication. The mechanical tests of the new solid lubricants helped to establish a relationship between the nanostructure of the layered material and its lubricating properties. Pin-on-disc tests showed low friction coefficients (from µ ≈ 0.05). The results suggest that the chemical modification decreased the electrostatic interactions between the titania planes, making the layered compound easily deformable.