不同声压下酒精水溶液中的单泡声致发光

Single-bubble sonoluminescence under different acoustic pressure in ethanol aqueous solutions

测量了不同浓度酒精水溶液中单泡声致发光随驱动超声声压大小变化关系曲线.结果表明,根据光强-声压(I-Pa)曲线的变化关系,可以把酒精浓度分为3个区域.(1)在较低浓度时,随着酒精浓度的增加,曲线往低声压方向移动,驱动声压变化较大;相同声压下,单泡声致发光的发光强度随酒精浓度增加而增加.(2)当酒精浓度稍高时,驱动声压变化较小;相同声压下,单泡声致发光光强随酒精浓度的增加而降低.(3)进一步增加酒精浓度,光强随酒精浓度变化关系趋势在不同声压下的关系不同,但I-Pa曲线的斜率随酒精浓度的增加而降低.可以通过气泡动力学以及酒精的物理化学性质解释这些结果,同时这些结果也有助于进一步了解单泡声致发光的发光机制.

The curves of single-bubble sonoluminescence（SBSL） intensity versus driving acoustic pressure（I-Pa） 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 I-Pa 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.