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University of Basel

06 April 2016

Silicone films for artificial muscles

Researchers of the University of Basel and Empa have gotten a step closer to engineering artificial muscles: they have developed a method to generate nanometer-thin silicone films.

Experimentally observed multi-cone jet as generated during electrospraying silicone.
Experimentally observed multi-cone jet as generated during electrospraying silicone. © University of Basel, Bert Müller

Elastomers, which can transform electrical energy into mechanical energy, have a wide variety of applications, i.e. powering windscreen wipers, sound generation, and operating camera lenses. By surrounding the synthetic material with electrodes and applying operation voltage, it expands laterally. In the field of medicine, this principle is promising for the development of artificial muscles for treating severe incontinence, as the consortium recently communicated.

To provide the necessary strain, micrometer-thick silicone layers need an operation voltage of several hundred volts, which is by far too high for applications within the human body. In contrast, nanometer-thin layers require only a few volts. To generate forces necessary to reach continence, several thousand layers have to be put on top of each other.

Coating using electrospray

Current manufacturing methods do not allow the efficient fabrication of such layered nanostructures. The team of Prof. Müller from the Biomaterials Science Center of the University of Basel, together with researchers of Empa, has developed a deposition method to prepare extremely flat silicone layers that are much thinner than a micron. The roughness is smaller than one nanometer. For this purpose, silicone molecules in solution are sprayed assisted by high voltages – termed electrospray deposition.

Usually electrospraying is based on direct current. The researchers from Basel, however, employ an alternating current. “This rather simple deposition technique has a huge potential, as it is adaptable to the industrial requirements for producing artificial muscles as well as powering windscreen wipers”, Bert Müller said. He expects that patients suffering from severe incontinence could benefit from the technology.

Original articles
Florian M. Weiss, Tino Töpper, Bekim Osmani, Sven Peters, Gabor Kovacs, and Bert Müller
Electrospraying Nanometer-Thin Elastomer Films for Low-Voltage Dielectric Actuators
Advanced Electronic Materials 2016, 1500476 | DOI: 10.1002/aelm.201500476

Florian M. Weiss, Tino Töpper, Bekim Osmani, Hans Deyhle, Gabor Kovacs, and Bert Müller
Thin Film Formation and Morphology of Electro-sprayed Polydimethylsiloxane
Langmuir 2016 | DOI: 10.1021/acs.langmuir.6b00476

Elisa Fattorini, Tobia Brusa, Christian, Gingert, Simone E. Hieber, Vanessa Leung, Bekim Osmani, Marco D. Dominietto, Philippe Büchler, Franc Hetzer, and Bert Müller
Artificial Muscle Devices: Innovations and Prospects for Fecal Incontinence Treatment
Annals of Biomedical Engineering 2016 | DOI: 10.1007/s10439-016-1572-z


Further information
Prof. Dr. Bert Müller, University of Basel, Biomaterials Science Center, Tel.: +41 61 207 54 31, E-Mail: bert.mueller@unibas.ch.

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