共查询到15条相似文献,搜索用时 125 毫秒
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超声雾化对声压谱和声化学反应的影响 总被引:1,自引:1,他引:0
超声雾化对声压谱和声化学反应的影响刘金春彭逸华(苏州城建环保学院苏州·215011)1引言空化动力学[1]表明,只有当气泡自然共振频率高于声波频率,气泡才能经历溃灭过程,形成局部瞬间高温和高压,为声化学反应提供有利的环境条件,这种空化称为有效空化。特... 相似文献
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文章以4'',6-二脒基-2-苯基吲哚为荧光探针,通过荧光光谱方法研究了超声结合姜黄素类似物4,4-双甲基姜黄素(dimethylcurcumin,DMCU)对DNA的损伤作用,并采用氧化-萃取分光光度法及活性氧清除剂对超声作用过程中活性氧(Reactive Oxygen Species,ROS)的产生及其种类进行了检测和鉴别。结果表明,与单独DMCU作用或单独超声作用相比,超声与DMCU的协同作用对DNA的损伤效应更强,且损伤程度随超声照射时间和DMCU浓度的增加而增大。此外,DMCU在超声作用下会降解,且DMCU的降解速率和程度与一定条件下的DNA损伤程度有关,说明DMCU声化学反应中活性氧的产生是导致DNA损伤的原因。结果表明DMCU有可能成为一种新结构类型的声敏剂。 相似文献
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Phong le V Hung TQ Son VT Kim S Jeong JH Kim C Jeong JR 《Journal of nanoscience and nanotechnology》2011,11(3):2726-2729
In this study, we successfully synthesized monodisperse magnetite nanoparticles (NPs) (Fe3O4) by sonochemical method using mono (ethylene glycol) (MEG) as a modifier of the reaction environment and found that MEG could be a good candidate to prevent oxidation and toxicity in sonochemical synthesis. The microstructure and size distribution of the Fe3O4 NPs were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM) respectively. It revealed that the NPs prepared by MEG assisted sonochemical method show a smaller average size and better monodispersity compared to conventional sonochemical method. Due the the reduced average size and uniform size distribution nature of the NPs, it also showed good superparamagnetic properties with very low coercivity less than 0.5 Oe. 相似文献
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A simple sonochemical approach for the preparation of PbS nanoparticles homogeneously coated on sub-micrometer silica spheres
has been described. The transmission electron microscopy and scanning electron microscopy images show that the PbS nanoparticles
with size of 30 nm were coated on the silica spheres, without any free nanoparticles. X-ray diffraction reveals that the PbS
nanoparticles are of cubic rock-salt structure. Moreover, by dissolving the silica cores with a diluted hydrofluoric acid
solution, stable PbS hollow structures were obtained. It is considered that the sonochemical process in which triethanolamine
acted as complex agent played an important role for the homogenouse coating of PbS nanoparticles on silica spheres. 相似文献
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Fly ash samples modified by NaOH solution and sonochemical treatment were tested for a basic dye (methylene blue) adsorption in aqueous solution. It is found that sonochemical treatment of fly ash can significantly increase the adsorption capacity depending on the concentration of NaOH and treatment time. The untreated FA and the sonochemically treated sample exhibits adsorption capacity at 6 x 10(-6)mol/g and 1.2 x 10(-5)mol/g at 30 degrees C, respectively. The adsorption tests show that solution pH and adsorption temperature also influence the adsorption behaviour. The adsorption isotherms can be fitted by Langmuir and Freudlich models, while the two-site Langmuir heterogeneous model will present the best result. 相似文献