Textile Experiments Protocols For the characteristic curve experiment (Figure 2G): The transmitter PMUT was operated at 5 V AC for this experiment. The pieces of textiles were cut in the dimension of 3 cm x 2 cm and submerged in water in a container for 5 min, ensuring its wet. After removal, each piece are waved 20 times to drip off excess water. Mass and the voltage were then measured using the mass balance and the PLP respectively. The pieces were put in the muffled oven for 2 min at 50 °C.
