Department of Chemistry, University of Bath, Bath BA2 7AY, UK.
Ultrason Sonochem. 2012 Mar;19(2):358-64. doi: 10.1016/j.ultsonch.2011.06.022. Epub 2011 Jul 23.
The sonochemical acceleration of bleaching of Rhodamine B by sodium hypochlorite has been studied using ultrasound intensities in the range 0-7 W cm(-2). Using a 20 kHz ultrasonic horn, it was shown that ultrasound could significantly shorten the treatment time and/or the concentration of hypochlorite required for the reaction. A number of intermediate species formed during the reaction have been identified. It was demonstrated that the same sonochemical reactions occur during the use of dental ultrasound instruments of the type used in endodontics where hypochlorite solutions act as disinfectants. Results showed pseudo-first order degradation kinetics for the degradation of Rhodamine B for both types of source. Both the distribution of cavitation and the resulting bleaching reactions were dependent on the design of the tips. The bleaching reaction can therefore be used to characterise the behaviour of dental instruments and aid in the optimisation of their performance.
超声化学加速次氯酸钠漂白罗丹明 B 的研究采用了 0-7 W cm(-2) 范围内的超声强度。使用 20 kHz 的超声变幅杆，结果表明超声可以显著缩短反应所需的处理时间和/或次氯酸钠的浓度。在反应过程中形成了一些中间产物。结果表明，在使用牙髓腔器械时，同样的声化学反应发生，其中次氯酸盐溶液作为消毒剂。结果表明，对于两种类型的源，罗丹明 B 的降解均符合准一级动力学。空化的分布和由此产生的漂白反应都取决于尖端的设计。因此，可以利用漂白反应来描述牙科器械的行为，并有助于优化其性能。
