Ionic liquid-based actuators working in air: The effect of ambient humidity

Must, Indrek; Vunder, Veiko; Kaasik, Friedrich; Põldsalu, Inga; Johanson, Urmas; Punning, Andres; Aabloo, Alvo

doi:10.1016/j.snb.2014.05.074

Cited by 67 publications

(57 citation statements)

References 42 publications

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“…Anion conducting ionomers are very sensitive to humidity; therefore we expect that the applied RH will significantly affect the morphology of the electrospun anion conducting ionomers. We found that at relatively high RH levels, extensive discharging of the electrospun anion conducting ionomer fibers was observed.…”

Section: Resultsmentioning

confidence: 99%

Electrospun Ionomeric Fibers with Anion Conducting Properties

Mann‐Lahav

Halabi

Shter

et al. 2019

Adv Funct Materials

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Anion conductive nanofiber mats from FAA-3 ionomers are obtained by electrospinning. Depending on the solvent used in the precursor solution, nanofibers with either nonhollow cylindrical or flat ribbon-like cross-sections are prepared. The anion conductivity and water uptake of the ionomeric nanofiber mats are measured as a function of the relative humidity in the 10-90% range and compared to that of a solid membrane cast from the same ionomer. In addition, the anion conductivity of an isolated single fiber of the ionomer is measured for the first time. The anion conductivity of the electrospun single fiber is found to be higher than that of the mats, which is, in turn, one order of magnitude higher than that of the solid ionomer membrane. The higher conductivity of the mats relative to the solid membrane (in both inplane and through-plane directions) is found to be related to the variation in water uptake, which stems from the morphological distinctions. These results increase the understanding of the electrospinning process of ionomers, toward the development and design of new anion conductive ionomer fibers, useful for high performance electrochemical devices.

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Section: Resultsmentioning

confidence: 99%

Electrospun Ionomeric Fibers with Anion Conducting Properties

Mann‐Lahav

Halabi

Shter

et al. 2019

Adv Funct Materials

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“…Regardless of the electrolyte, it is possible that actuation performances of the IEAP actuators with IL electrolytes are not identical in a vacuum chamber and at atmospheric pressure. An even more important factor is that the ambient humidity (Must et al, 2014), that is totally absent in the vacuum environment, affects the performance of the IL-based IEAP actuators. Second, owing to the long exposure time of this particular SEM equipment, the images can be recorded only after all rapid processes have already taken place.…”

Section: Discussionmentioning

confidence: 99%

In situ scanning electron microscopy study of strains of ionic electroactive polymer actuators

Punning

Vunder

Must

et al. 2015

Journal of Intelligent Material Systems and Structures

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We have developed a technique to determine the bending strain of ionic electroactive polymer actuators without the use of the macroscopic bending geometry. In situ comparisons of the scanning electron microscope micrographs from a bending ionic electroactive polymer actuator, using a digital image correction methodology, identify its bi-directional deformation field. The developed technique allows verification of the factual axial and thickness strains of any notional layer of the actuator, including the outer surfaces of the electrodes. Thus, calculation of the bending and thickness strains of the ionic electroactive polymer laminate becomes possible. Moreover, the technique allows the determination of the position of the neutral layer of bending that is an important requirement for the calculation of the second area and bending moments of the beam. The four examples presented demonstrate the potential variations of the bending schemes, in cases where the neutral layer is at the centroid and shifted away from the centroid.

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“…Given that to date there is no standard of carrying out the electromechanical measurements of IPMCs nor a universal characteristic to objectively compare the stroke or the force of different bending actuators, it is best to accompany the results with detailed description of the geometry of the experimental setup and parameters of the driving signals. Furthermore, it is very important to report the ambient humidity and temperature during the electromechanical measurements as the performance of both water-and ionic liquid-based IPMCs has been reported to be influenced by these parameters (Brunetto et al 2010;Must et al 2014).…”

Section: Reporting the Electromechanical Responsementioning

confidence: 99%