QuoteHe said the paper claimed to extract energy from the vacuum. It did not.
Versus We recently discovered that freestanding graphene membranes are in perpetual motion when held at room temperature... The higher kinetic energy associated with this motion is derived from the surrounding thermal waste heat... In this Letter, we report a new mechanism, spontaneous mirror buckling, which occurs without a temperature gradient. What powers this motion, after then? Law of thermodynamics require to have (and to dissipate) temperature gradient for having macroscopic motion.
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It doesn't look like too much at the first sight - but it corresponds ten watts per square centimeter = this is roughly power density of induction stove. YouTube video (which has been authorized by Arkansas university) claims similar power density (10 microwatts out of a 10um * 10 um surface translates into 100kW out of 1m2). Now, which natural physical mechanism can be responsible for such a power flux, not to say without temperature gradient? For example Stephan-Boltzmann law gives radiative power flux about 480 Watts for radiation of 1 m2 of black body surface with 100% emissivity at room temperature to a free cosmic space at 2,7K (i.e. more than 270 K temperature gradient).