微反应器的声致发光和声致化学发光
Sonoluminescence and sonochemiluminescence from a microreactor
摘要：
衬底上的微加工凹坑可用于使暴露于超声场的液体中的微气泡成核和稳定。在合适的条件下，这些气泡的破裂可以导致光发射（声致发光，SL）。气泡破裂过程中产生的羟基自由基（OH*）可以与鲁米诺反应产生光（声致化学发光，SCL）。SL和SCL强度记录了几个制度的压力振幅（低和高的声功率级）在一个给定的超声波频率（200 kHz）的纯水，鲁米诺和丙醇水溶液。研究了凹坑的各种排列，凹坑的数量从没有凹坑（与经典的超声反应器相当）到三个凹坑。在存在一个以上凹坑的情况下，在高压状态下，喷射的微泡组合成线性（两个凹坑）或三角形（三个凹坑）的气泡云（流光）。在所有的情况下，坑是存在于基板上，SL被加强，并在低和高功率水平的坑的数量增加。为了使SL发射区域成像，在类似条件下使用氩（Ar）饱和水。从丙醇水溶液（50 mM）的SL排放提供了瞬时气泡空化的证据。含有0.1 mM鲁米诺的溶液也被用来证明通过获得SCL发射区域的自由基产生。
英文摘要：
Micromachined pits on a substrate can be used to nucleate and stabilize microbubbles in a liquid exposed to an ultrasonic field. Under suitable conditions, the collapse of these bubbles can result in light emission (sonoluminescence, SL). Hydroxyl radicals (OH*) generated during bubble collapse can react with luminol to produce light (sonochemiluminescence, SCL). SL and SCL intensities were recorded for several regimes related to the pressure amplitude (low and high acoustic power levels) at a given ultrasonic frequency (200 kHz) for pure water, and aqueous luminol and propanol solutions. Various arrangements of pits were studied, with the number of pits ranging from no pits (comparable to a classic ultrasound reactor), to three-pits. Where there was more than one pit present, in the high pressure regime the ejected microbubbles combined into linear (two-pits) or triangular (three-pits) bubble clouds (streamers). In all situations where a pit was present on the substrate, the SL was intensified and increased with the number of pits at both low and high power levels. For imaging SL emitting regions, Argon (Ar) saturated water was used under similar conditions. SL emission from aqueous propanol solution (50 mM) provided evidence of transient bubble cavitation. Solutions containing 0.1 mM luminol were also used to demonstrate the radical production by attaining the SCL emission regions.
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