Stacked dielectric elastomer actuators are fabricated by an automated process using spin coating of uncured elastomers.
To improve the performance of these multilayer actuators we present two different ways. To reduce the driving voltage it
is desirable to fabricate dielectric films with a thickness below 20 μm. This can be achieved by high speed spin coating
of an uncured elastomer. Analyzing the automated process reveals nine principal process parameters. An adequate design
of experiment reduces the number of necessary tests to an acceptable value. With these results we are able to spin thin
films with a thickness of less than 5 μm and a thickness variation of about 3%.
Secondly, we examine the influence of nanosized particles of metal oxide powder on the permittivity of the elastomer
film. Three different materials, namely aluminiumoxide, titaniumdioxide and bariumtitanate with a bulk permittivity of
about 10, 100, 1000, respectively, are used to increase the overall permittivity of the composite. To predict the resulting
performance of an elastomer actuator the figure of merit Κ is introduced.
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