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Observation of cavitation dynamics in viscous deep eutectic solvents during power ultrasound sonication
Faraday Discussions ( IF 3.3 ) Pub Date : 2024-03-14 , DOI: 10.1039/d4fd00031e Ben Jacobson 1 , Shida Li 1 , Paul Daly 1 , Christopher E Elgar 2 , Andrew P Abbott 2 , Andrew Feeney 1 , Paul Prentice 1
Faraday Discussions ( IF 3.3 ) Pub Date : 2024-03-14 , DOI: 10.1039/d4fd00031e Ben Jacobson 1 , Shida Li 1 , Paul Daly 1 , Christopher E Elgar 2 , Andrew P Abbott 2 , Andrew Feeney 1 , Paul Prentice 1
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Deep eutectic solvents (DESs) are a class of ionic liquid with emerging applications in ionometallurgy. The characteristic high viscosity of DESs, however, limit mass transport and result in slow dissolution kinetics. Through targeted application of high-power ultrasound, ionometallurgical processing time can be significantly accelerated. This acceleration is primarily mediated by the cavitation generated in the liquid surrounding the ultrasound source. In this work, we characterise the development of cavitation structure in three DESs of increasing viscosity, and water, via high-speed imaging and parallel acoustic detection. The intensity of the cavitation is characterised in each liquid as a function of input power of a commercially available ultrasonic horn across more than twenty input powers, by monitoring the bubble collapse shockwaves generated by intense, inertially collapsing bubbles. Through analysis of the acoustic emissions and bubble structure dynamics in each liquid, optimal driving powers are identified where cavitation is most effective. In each of the DESs, driving the ultrasonic horn at lower input powers (25%) was associated with greater cavitation performance than at double the driving power (50%).
中文翻译：
功率超声处理过程中粘性低共熔溶剂空化动力学的观察
低共熔溶剂 (DES) 是一类在离子冶金领域具有新兴应用的离子液体。然而，DES 特有的高粘度限制了传质并导致溶解动力学缓慢。通过有针对性地应用高功率超声波，可以显着加快离子冶金处理时间。这种加速主要是由超声源周围液体中产生的空化介导的。在这项工作中，我们通过高速成像和并行声学检测来表征三种粘度增加的 DES 和水中空化结构的发展。通过监测由强烈的惯性塌陷气泡产生的气泡塌陷冲击波，将每种液体中的空化强度表征为市售超声波喇叭的输入功率的函数，输入功率超过二十个。通过分析每种液体中的声发射和气泡结构动力学，可以确定空化最有效的情况下的最佳驱动功率。在每个 DES 中，以较低输入功率 (25%) 驱动超声波喇叭比以双倍驱动功率 (50%) 驱动超声波喇叭具有更高的空化性能。
更新日期：2024-03-14
中文翻译：
功率超声处理过程中粘性低共熔溶剂空化动力学的观察
低共熔溶剂 (DES) 是一类在离子冶金领域具有新兴应用的离子液体。然而，DES 特有的高粘度限制了传质并导致溶解动力学缓慢。通过有针对性地应用高功率超声波，可以显着加快离子冶金处理时间。这种加速主要是由超声源周围液体中产生的空化介导的。在这项工作中，我们通过高速成像和并行声学检测来表征三种粘度增加的 DES 和水中空化结构的发展。通过监测由强烈的惯性塌陷气泡产生的气泡塌陷冲击波，将每种液体中的空化强度表征为市售超声波喇叭的输入功率的函数，输入功率超过二十个。通过分析每种液体中的声发射和气泡结构动力学，可以确定空化最有效的情况下的最佳驱动功率。在每个 DES 中，以较低输入功率 (25%) 驱动超声波喇叭比以双倍驱动功率 (50%) 驱动超声波喇叭具有更高的空化性能。
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