Dr Samuel Rosset
Dr Samuel Rosset
Dr Samuel Rosset
https://unidirectory.auckland.ac.nz/profile/s-rossetSenior Research Fellow The University of Auckland: Auckland Bioengineering Institute
Research | Current
Soft and smart transducers
- Dielectric elastomer actuators (DEAs) for biomedical applications: Cells in our body are constantly submitted to mechanical strain and stress. Cells react to these mechanical cues by activating signal pathways (mechanotransduction), by orientating relative to the direction of traction, by differentiating, etc. These mechanically-induced responses are difficult to reporoduce in vitro, as cells are usually cultured in rigid Petri dishes. Soft actuators enables to culture cells on a stretchable membrane, which can be locally deformed by the application of an electrical signal, thus stretching the cells that are cultured on it. These deformable bioreactors are compact and transparent, and well suited for in-situ observation of cells under stretch.
There are many applications of deformable bioreactors able to stretch cells:
- Fabrication processes: Dielectric elastomer actuators are easy to make: take a membrane of 3M VHB tape, stretch it on a frame, apply some carbon poweder to serve as compliant electrodes and that's it. However, lifetime and reproducibility of such devices is low. How to make reliable DEAs? How to precisely pattern compliant electrodes on a thin suspended membrane? I am interested in all aspects of reliable fabrication of DEAs, and especially by the patterning of the compliant electrodes. I have worked with electrodes made by metal ion implantation, pad printing, spray-coating and inkjet printing.
- Fabrication process of dielectric elastomer actuators, JoVE, 2015, 108, e53423
- Fully printed thin dielectric elastomer actuators, Appl. Phys. Lett., 2015, 107, 24, 244104
- Metal ion implantation for the fabrication of stretchable electrodes on elastomers, Adv. Funct. Mater., 2009, 19,3,470-478
- Inkjet printing of carbon black electrodes for DEAs, Proc. of SPIE, 2017, 10163,1016311
- Modelling and characterisation of soft actuators: I work on different modelling aspects of dielectric elastomer actuators. How to suppress the viscoelastic drift?, How to characterise the ageing and degradation of the electrodes? How to optimise the actuation of DEAs in specific configurations?
- High Voltage Electronics: dielectric elastomer actuators work with high electric fields, but low power. There is a lack of commercial power supply that combine the required properties (generation of high voltage, possibility to generate HV square signals with high slew rate, easily programmable, lighy & compact, etc.) at an affordable price. We have consequently developped a High Voltage power supply (HVPS), which is specifically designed to drive electrostatic actuators. We have released the project with an open source license: project Peta-pico-Voltron.
Teaching | Current
ENGSCI-753: Computational Techniques in Continuum Mechanics and Bioengineering
Areas of expertise
- Soft transducers
- Fabrication processes
Selected publications and creative works (Research Outputs)
- Rosset, S., & Shea, H. R. (2016). Small, fast, and tough: Shrinking down integrated elastomer transducers. Applied Physics Reviews, 3 (3), 031105-031105. 10.1063/1.4963164
- Rosset, S., Araromi, O. A., Schlatter, S., & Shea, H. R. (2016). Fabrication process of silicone-based dielectric elastomer actuators. Journal of Visualized Experiments (108)10.3791/53423
- Poulin, A., Saygili Demir, C., Rosset, S., Petrova, T. V., & Shea, H. (2016). Dielectric elastomer actuator for mechanical loading of 2D cell cultures. Lab Chip, 16 (19), 3788-3794. 10.1039/C6LC00903D
- Maffli, L., Rosset, S., Ghilardi, M., Carpi, F., & Shea, H. (2015). Ultrafast All-Polymer Electrically Tunable Silicone Lenses. Advanced Functional Materials, 25 (11), 1656-1665. 10.1002/adfm.201403942
- Araromi, O. A., Gavrilovich, I., Shintake, J., Rosset, S., Richard, M., Gass, V., & Shea, H. R. (2015). Rollable multisegment dielectric elastomer minimum energy structures for a deployable microsatellite gripper. IEEE/ASME Transactions on Mechatronics, 20 (1), 438-446. 10.1109/TMECH.2014.2329367
- McKay, T. G., Rosset, S., Anderson, I. A., & Shea, H. (2015). Dielectric elastomer generators that stack up. Smart Materials and Structures, 24 (1)10.1088/0964-1726/24/1/015014
Other University of Auckland co-authors: Iain Anderson
- Rosset, S., & Shea, H. R. (2013). Flexible and stretchable electrodes for dielectric elastomer actuators. Applied Physics A, 110 (2), 281-307. 10.1007/s00339-012-7402-8
- Rosset, S., Niklaus, M., Dubois, P., & Shea, H. R. (2009). Metal Ion Implantation for the Fabrication of Stretchable Electrodes on Elastomers. Advanced Functional Materials, 19 (3), 470-478. 10.1002/adfm.200801218