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(A) A radiofrequency (13.56 MHz) generator (black arrow) was used to generate a focused, high-voltage electric field between the transmitting (Tx) and receiving (Rx) heads. An infrared camera (blue arrow) was used to record the temperature of the sample (red arrow). (B) Temperature plots for PBS alone and with 100, 250, or 500 mg/mL propylene glycol. Least-squares linear regressions (solid lines) are used to calculate RF heating rates.
