不同声压下酒精水溶液中的单泡声致发光
摘要
The curves of single-bubble sonoluminescence (SBSL) intensity versus driving acoustic pressure (<italic>I-P</italic><sub>a</sub>) were measured in ethanol aqueous solutions with different ethanol concentrations. The results show that the ethanol concentrations can be divided into three zones based on the different changing laws of the <italic>I-P</italic><sub>a</sub> curves. (1) Increasing zone. At relative low ethanol concentration, the curves move toward the pressure decreasing direction. The SBSL intensity increases when the ethanol concentration increases under the same acoustic pressure. (2) Decreasing zone. As ethanol concentration increased, the curves move downward the intensity axis, that is, the SBSL intensity decreases as the concentration of ethanol increases. (3) Flat zone. At relative high ethanol concentration, the slope of the curve decreases as ethanol concentration increases. The bubble dynamics and the physical-chemical effect of ethanol can be responsible for the results.