Experimental investigation of the response of gas-filled micropores to ultrasound

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Abstract
Hydrophobic membranes with gas-trapping micropores were used in ultrasonic bioeffects experiments to determine the efficacy of the cavitation mechanism at low intensities. Membranes were tested with circular pores of .apprx. 2.5 to 5.4 .mu.m in diameter and these pores trapped gas when the membranes were immersed in water such that the resulting bubbles were stable against diffusion. Only a few pores remain completely filled with gas upon immersion, and the distribution in partial filling apparently results in a distribution of resonance frequencies for the bubbles in a membrane, even when the pores are essentially all identical in size. Applications to the gas bodies present in plant tissues are discussed.
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