@article{WacheMcCarthyRisseetal.2015, author = {Wache, Remi and McCarthy, Denis N. and Risse, Sebastian and Kofod, Guggi}, title = {Rotary Motion Achieved by New Torsional Dielectric Elastomer Actuators Design}, series = {IEEE ASME transactions on mechatronics}, volume = {20}, journal = {IEEE ASME transactions on mechatronics}, number = {2}, publisher = {Inst. of Electr. and Electronics Engineers}, address = {Piscataway}, issn = {1083-4435}, doi = {10.1109/TMECH.2014.2301633}, pages = {975 -- 977}, year = {2015}, abstract = {This paper reports a new way to produce a rotation motion actuated by dielectric elastomer actuators. Two specific electrode designs have been developed and the rotation of the actuator centers has been demonstrated and measured. At low strains, the rotation shows a nearly quadratic dependence with the voltage. This behavior was used to compare the performances between the two proposed designs. Among the tested configurations, a maximal rotation of 10 degrees was achieved.}, language = {en} } @article{StoyanovKolloscheRisseetal.2013, author = {Stoyanov, Hristiyan and Kollosche, Matthias and Risse, Sebastian and Wache, Remi and Kofod, Guggi}, title = {Soft conductive elastomer materials for stretchable electronics and voltage controlled artificial muscles}, series = {Advanced materials}, volume = {25}, journal = {Advanced materials}, number = {4}, publisher = {Wiley-VCH}, address = {Weinheim}, issn = {0935-9648}, doi = {10.1002/adma.201202728}, pages = {578 -- 583}, year = {2013}, abstract = {Block copolymer elastomer conductors (BEC) are mixtures of block copolymers grafted with conducting polymers, which are found to support very large strains, while retaining a high level of conductivity. These novel materials may find use in stretchable electronics. The use of BEC is demonstrated in a capacitive strain sensor and in an artificial muscle of the dielectric elastomer actuator type, supporting more than 100\% actuation strain and capacity strain sensitivity up to 300\%.}, language = {en} } @article{KussmaulRisseKofodetal.2011, author = {Kussmaul, Bjoern and Risse, Sebastian and Kofod, Guggi and Wache, Remi and Wegener, Michael and McCarthy, Denis N. and Kr{\"u}ger, Hartmut and Gerhard, Reimund}, title = {Enhancement of dielectric permittivity and electromechanical response in silicone elastomers molecular grafting of organic dipoles to the macromolecular Network}, series = {Advanced functional materials}, volume = {21}, journal = {Advanced functional materials}, number = {23}, publisher = {Wiley-VCH}, address = {Weinheim}, issn = {1616-301X}, doi = {10.1002/adfm.201100884}, pages = {4589 -- 4594}, year = {2011}, abstract = {A novel method is established for permittivity enhancement of a silicone matrix for dielectric elastomer actuators (DEAs) by molecular level modifications of the elastomer matrix. A push-pull dipole is synthesized to be compatible with the silicone crosslinking chemistry, allowing for direct grafting to the crosslinker molecules in a one-step film formation process. This method prevents agglomeration and yields elastomer films that are homogeneous down to the molecular level. The dipole-to-silicone network grafting reaction is studied by FTIR. The chemical, thermal, mechanical and electrical properties of films with dipole contents ranging from 0 wt\% to 13.4 wt\% were thoroughly characterized. The grafting of dipoles modifies the relative permittivity and the stiffness, resulting in the actuation strain at a given electrical field being improved by a factor of six.}, language = {en} }