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Droplet temperature vs. RF coil current. A 50 μL aqueous droplet covered with magnetic porous Si microparticles is placed in mineral oil and heated from 26 °C with an alternating electromagnetic field for 30 s. Droplet temperature is measured immediately after the electromagnetic field is turned off. Each data point represents an average of three consecutive measurements. The coil current is expressed as the root-mean-square (or RMS) of the current sinusoid.
