Spatial Separation of Cavitating Bubble Populations: The Nanodroplet Injection Model

被引：90

作者：

Xu, Hangxun ^{[1
]}

Eddingsaas, Nathan C. ^{[1
]}

Suslick, Kenneth S. ^{[1
]}

机构：

[1] Univ Illinois, Sch Chem Sci, Urbana, IL 61801 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2009年 / 131卷 / 17期

基金：

美国国家科学基金会;

关键词：

NA-ASTERISK EMISSION; METAL SALT-SOLUTIONS; MULTIBUBBLE SONOLUMINESCENCE; ACOUSTIC CAVITATION; SULFURIC-ACID; TEMPERATURE; SPECTRA; SONOCHEMISTRY; GASES;

D O I：

10.1021/ja900457v

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Intense Na* emission was observed from 0.1 M Na2SO4 in 95% sulfuric acid during multibubble sonoluminescence (MBSL). As a function of acoustic intensity, three different morphologies are observed for the cloud of light emitting bubbles. Even more strikingly, there is a spatial separation between blue-white emitting bubbles and orange emitting bubbles, easily observed by the naked eye. Surprisingly, no Na* emission was observed on the top of a bubble cloud (blue-white emission) while strong Na* emission predominates at the bottom. This observation provides the first experimental evidence to distinguish between the two types of two-site models of acoustic cavitation and MBSL: spatial separation of emission from nonvolatiles (e.g., Na*) ought not to be observed for the heated-shell model but is predicted from the injected droplet model.

引用

页码：6060 / +

页数：3

共 32 条

[1] Sonoluminescence of Na atom from NaCl solutions doped with ethanol [J].