排序方式: 共有94条查询结果,搜索用时 406 毫秒
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超声化学法合成金属硫族半导体纳米材料 总被引:15,自引:0,他引:15
随着纳米科技的发展,合成纳米材料的新方法层出不穷。超声化学方法合成纳米材料近年来得到了飞速的发展,引起了科学界越来越多的关注。本文从超声化学的基本原理和特点出发,简要介绍了近年来超声化学法在水、有机溶剂及微乳液中合成金属硫族半导体纳米材料和复合金属纳米材料的进展。在水溶液中超声化学制备金属硫族半导体纳米材料方便、简单,而在有机溶剂和微乳液中制备,能更好地控制粒子的尺寸和形貌。 相似文献
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声化学氧化在污水净化中的研究进展 总被引:4,自引:0,他引:4
对近年来声化学氧化在污水净化中的研究进展作了比较全面的综述,介绍了声化学氧化反应的原理,特点,影响因素以及目前所取得的研究成果。超声空化作用是声化学反应的主动力,影响声化学反应的主要因素有:超声功率强度,超声波频率,声能密度,物系性质,反应器结构等,实用性和协同性(与其它水处理技术联合)是声化学氧化今后主要的两个研究方向。 相似文献
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采用超声化学法方便地制得了Sr1-xPbxTiO3(SPT)纳米粉末.高强度的超声作用促使了SPT纳米颗粒的快速形成.通过控制Sr2 和Pb2 的摩尔比,可以得到不同形貌的SPT纳米粉末:当x=0,可以得到球形的纳米粉末;随着Pb2 含量的增加,SPT纳米粉末的形状由球形变成方形.通过X射线衍射仪对SPT纳米粉末进行表征.结果表明:在固定的起始反应物总浓度下,随着Pb2 含量的增加,所得到纳米粉末的微结构也随之变化.超声化学法合成SPT纳米粉的反应分两个过程进行:首先TiCl4水解形成富钛凝胶;然后在超声影响下,溶液中的Sr2 和Pb2 扩散到钛凝胶表面,并以其为核生成SPT纳米颗粒. 相似文献
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Assad Farooq Ayesha Rasheed Jawairia Umar Khan Farida Irshad 《Journal of Natural Fibers》2018,15(5):680-686
Natural dyeing has been the focus of many previous researches as a substitute for synthetic dyeing, which is a known hazardous process. However, the limitations in the color range and poor fastness properties are the main obstacles in the further development of natural dyeing processes. This work corresponds to the inclusion of ultrasonic energy to enhance the color yield and color fastness properties of fabrics dyed with natural dyes. Cotton fabrics were dyed with acacia dye using conventional infrared exhaust and ultrasonic assisted procedures. Moreover, the effects of different processing factors like temperature, time, and liquor ratio were also investigated, in order to optimize the process. The ultrasonic assisted dyeing shows promising results in terms of both shade depth and washing fastness. 相似文献
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An environmentally friendly and efficient procedure is developed for ring opening of various epoxides with thiols under non-thermal conditions. Reactions take place by ultrasonic irradiation of the two reactants suspended in an additive-free aqueous medium. Consequently, high-yield formation of various β-hydroxy sulfides is quickly observed. 相似文献
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