Sunartio Devi, Ashokkumar Muthupandian, Grieser Franz
School of Chemistry, University of Melbourne, Melbourne VIC 3010, Australia.
J Phys Chem B. 2005 Oct 27;109(42):20044-50. doi: 10.1021/jp052747n.
The effect of varying the applied acoustic power on the extent to which the addition of water-soluble solutes affect the intensity of aqueous multibubble sonoluminescence (MBSL) has been investigated. Under most of the experimental conditions used, the addition of aliphatic alcohols to aqueous solutions was found to suppress the MBSL intensity, although an enhancement of the MBSL intensity was also observed under certain conditions. In contrast, the presence of an anionic surfactant sodium dodecyl sulfate (SDS) in aqueous solutions generally enhanced the observed MBSL intensity. For a series of aliphatic alcohols and SDS, a strong dependence of the MBSL intensity on the applied acoustic power (in the range of 0.78-1.61 W/cm(2)) at 358 kHz was observed. The relative SL quenching was significantly higher at higher acoustic powers for the alcohol solutions, whereas the relative SL enhancement was lower at higher acoustic powers in SDS solutions. These observations have been interpreted in terms of a combination of material evaporation into the bubble, rectified diffusion, bubble clustering and bubble-bubble coalescence.
研究了改变施加的声功率对添加水溶性溶质影响水相多泡声致发光（MBSL）强度程度的作用。在所使用的大多数实验条件下，发现向水溶液中添加脂肪醇会抑制MBSL强度，不过在某些条件下也观察到MBSL强度增强。相比之下，水溶液中存在阴离子表面活性剂十二烷基硫酸钠（SDS）通常会增强观察到的MBSL强度。对于一系列脂肪醇和SDS，在358kHz下观察到MBSL强度强烈依赖于施加的声功率（在0.78 - 1.61W/cm²范围内）。对于醇溶液，在较高声功率下相对声致发光猝灭明显更高，而在SDS溶液中，在较高声功率下相对声致发光增强较低。这些观察结果已根据物质蒸发进入气泡、整流扩散、气泡聚集和气泡合并的综合作用进行了解释。
