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I Vibration Energy Harvester from Brownian motion

  1. Dec 5, 2017 #1
    Hi all, been a while since I studied physics but I saw something that I found strange,

    This device: https://researchfrontiers.uark.edu/good-vibrations/ from University of Arkansas

    A free floating graphene sheet extracting energy from brownian motion and converting that to electric current.

    wouldn't this violate the second law of thermodynamics? or am I missing something?
    Last edited by a moderator: Dec 7, 2017
  2. jcsd
  3. Dec 5, 2017 #2


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    Staff: Mentor

    The article is not really clear, so I had a look at the paper (pdf). As far as I understand that, you need a thermal gradient or mechanical motion of the overall system to drive these vibrations if you want to extract useful energy from them. The article makes a much bigger deal of this harvesting than the publication, which focuses on the research.
  4. Dec 6, 2017 #3

    Andy Resnick

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    That recent report references this review, which may be of additional interest.
  5. Dec 7, 2017 #4
    mtb, I'll have a look at the paper to see if I can get a better understanding of what is going on.
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