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Jahresbericht 2014 - Annual Report 2014

33JAHRESBERICHT 2014 / ANNUAL REPORT 2014 Electrical permittivity of layered ceramic tapes The electrical permittivity of trilayered BaTiO3 / BaTi1-x Zrx O3 /BaTiO3 ceramic tapes was studied. The samples were produced by sintering stacked homogeneous tapes composed of nanometric BaTi1-x Zrx O3 dispersed in a water-based, envi- ronmentally friendly binder system. The thermal mismatch between the layers increases with the amount of Zr4+ substituting Ti4+ . The internal stress developed during sintering affected the electrical permittivity. Despite limited diffusion between the layers, a simple mixture rule fails in predicting the electrical permittivity of the trilayered samples. Photodeposition of copper with UV light Continued investigation on the photochemistry of copper complexes has led to the determination of 275 nm as reaction wavelenght for the deposition of metallic copper. Cu(F6 Acac)2 and Cu(Acac)2 with Benzophenone in 2-Propanol and CuPyr2  4-TBC with Acetone in Ethanol are systems that deposit metallic copper. CuPyr2  4-TBC, designed and syn- thesized at INM, deposited copper more homo- geneously, in significantly higher quantity and at higher speed when compared with commercial complexes. Janus nanoparticles and their self- assembly in polymers and on surfaces In the synthesis of Janus particles, a new strategy was tested: Instead of preparing particles with subsequent transformation to Janus character, the synthesis was reduced to one step. In contrast to the different locally confined modifications, controlled growth of different particle compart- ments was achieved during particle synthesis. The focus was on silica particles with a huge va- riety of possible applications. For preparation, various silanes were used to build up different compartments. The particles were characterized by SEM and EDX to determine their shape and elemental composition. With this approach, the wax in water emulsion and the problematic slow reactivity of the silica particles can be avoided. OUTLOOK Thecombinationofopticaleffects,materialdevelop- ment and processing has been a core strategy of the Program Division Optical Materials. It has con- tributed to the sustainability of the technological platform and the balance between basic and ap- plied research. Our long term goal is to understand how material development can be used to access new optical effects as a basis for new products and to transfer these technologies to the market. Production of a touch sensor through photo- metallization process.

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