Sonochemistry and sonoluminescence in aqueous AuCl4- solutions in the presence of surface-active solutes
Sonochemistry and sonoluminescence in aqueous AuCl4- solutions in the presence of surface-active solutes
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DOI：
10.1021/jp990811t
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发表时间：
1999-10-28
影响因子：
3.3
通讯作者：
Grieser, F
中科院分区：
文献类型：
--
作者：
Barbour, K;Ashokkumar, M;Grieser, F
研究了515 kHz超声触发下AuCl4-还原为Au(0)的过程，并将其作为各种表面活性溶质浓度的函数。在乙醇、丙烷-1-醇和丁烷-1-醇存在下，AuCl4-的还原量取决于气/液界面上醇的表面过剩量，即气/液界面上醇的相对浓度与整体溶液浓度的相对浓度。在表面活性剂十二烷基硫酸钠或辛乙二醇单癸基醚存在下，AuCl4-的还原效率与溶液中表面活性剂的单体浓度有关。对超声辐照水溶液时的声致发光进行了监测，并与声化学实验中观察到的趋势进行了比较。在醇的存在下，声致发光明显减弱，这种效应与气/液界面处表面过量的醇有关。相反，表面活性剂对声致发光的影响高度依赖于表面活性剂的浓度和头基类型。
The 515 kHz ultrasound-initiated reduction of AuCl4- to Au(0) was examined as a function of the concentration of various surface-active solutes. The amount of AuCl4- reduced in the presence of ethanol, propan-1-ol, and butan-1-ol was found to be dependent on the surface excess of the alcohol at the gas/solution interface, i.e., the relative concentration of the alcohol at the gas/solution interface compared to the bulk solution concentration. The efficiency of reduction of AuCl4- in the presence of the surfactants sodium dodecyl sulfate or octaethylene glycol monodecyl ether was found to be related to the monomer concentration of the surfactant in solution. The light emitted (sonoluminescence) during ultrasonic irradiation of the aqueous solutions was also monitored and compared with the trends observed in the sonochemical experiments. The sonoluminescence was observed to be significantly reduced in the presence of alcohol, and the effect was correlated with the surface excess of the alcohols at the gas/solution interface. In contrast, the effect of the surfactants on the sonoluminescence was highly dependent on concentration and headgroup type of the surfactant.