I was watching a TED-talk on artificial muscle, HASEL, where the inventor demos that an insulated oil in the presence of electric potential field gets displaced due to Maxwell stress inside oil.

Question: What are the chemical properties specifically of the oil that allows such contraction to occur? Can oil be replaced with other fluid of different chemical properties to amplify the contraction effect?

enter image description here

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    $\begingroup$ science.sciencemag.org/content/359/6371/61 $\endgroup$
    – Mithoron
    Sep 21, 2020 at 22:41
  • $\begingroup$ @Mithoron +1 thanks for adding credible reference. $\endgroup$
    – gfdsal
    Sep 21, 2020 at 23:01
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    $\begingroup$ Btw. there is nothing "self-healing" in this contraption, and calling electrostatic attraction "Maxwell stress" is just an embarrassing try to make an nice little undergrad engineering project sound "scientific". $\endgroup$
    – Karl
    Sep 22, 2020 at 7:30
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    $\begingroup$ The loss on this one here goes up as soon as you want to become faster, because of the viscosity of the oil, which produces heat. Also the loss goes up when you come close to the maximal deformation. $\endgroup$
    – Karl
    Sep 22, 2020 at 18:04
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    $\begingroup$ A thinner (flatter) channel generally produces higher shear fields at the same volume flow rate, i.e. more friction. The linked paper unfortunately doesn't show the relevant graphs. That's Science magazine, mediocrity in paper form. $\endgroup$
    – Karl
    Sep 22, 2020 at 18:39


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