Jacobson Ben, Li Shida, Daly Paul, Elgar Christopher E, Abbott Andrew P, Feeney Andrew, Prentice Paul
James Watt School of Engineering, University of Glasgow, Glasgow G12 8QQ, UK.
School of Chemistry, University of Leicester, Leicester, LE1 7RH, UK.
Faraday Discuss. 2024 Oct 25;253(0):458-477. doi: 10.1039/d4fd00031e.
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, 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%).
深共熔溶剂（DESs）是一类在离子冶金中具有新兴应用的离子液体。然而，DESs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，可以显著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作用介导的。在这项工作中，我们通过高速成像和平行声学检测，对三种粘度递增的DESs以及水中空化结构的发展进行了表征。通过监测由强烈的、惯性坍缩气泡产生的气泡坍缩冲击波，在二十多种输入功率下，将每种液体中的空化强度表征为市售超声变幅杆输入功率的函数。通过分析每种液体中的声发射和气泡结构动力学，确定了空化最有效的最佳驱动功率。在每种DES中，以较低输入功率（25%）驱动超声变幅杆比以两倍驱动功率（50%）驱动时具有更高的空化性能。
