Sonication as a tool for preparing nanometric vermiculite particles
Sonication as a tool for preparing nanometric vermiculite particles
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DOI：
10.1088/0957-4484/13/3/328
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发表时间：
2002-05
期刊：
影响因子：
3.5
通讯作者：
J. Pérez-Rodríguez;F. Carrera;J. Poyato;L. Pérez-Maqueda
中科院分区：
文献类型：
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作者：
J. Pérez-Rodríguez;F. Carrera;J. Poyato;L. Pérez-Maqueda
我们研究了超声波对两种不同的天然宏观蛭石样品的影响，这些样品分别来自西班牙的奥仁和圣奥拉拉。介绍了超声化学法制备纳米粒子的条件。超声不仅在[00l]方向上产生分层效应，而且在其他方向上也产生层的破裂，同时保留了晶体特征。在这两种蛭石的行为上已观察到一些差异。因此，在长达30小时的处理时间内，Santa Olalla样品的晶粒尺寸显著减小；较长的处理时间对晶粒大小没有任何影响。另一方面，Ojen样品在长达80小时的处理时间内，其晶粒尺寸减小，在更长的处理时间内保持不变。Ojen样品在[00l]方向上的晶粒尺寸比Santa Olalla样品小得多。此外，Santa Olalla样品在超声后仍保持典型的层流形状，而Ojen样品则发生了形态变化。不同的行为似乎与不同的成分有关，因此，两种蛭石样品的层电荷不同。
We have studied the effect of ultrasound on two different natural macroscopic vermiculite samples from Ojen and Santa Olalla (Spain). We describe the conditions for the preparation of nanometric particles by sonochemistry. Sonication produces not only a delamination effect in the [00l] direction, but also a breaking of layers in the other directions, while the crystalline character is retained. Some differences have been observed in the behaviour of both vermiculites. Thus, the Santa Olalla sample suffers an important decrease in crystallite size with up to 30 h treatment time; longer treatment times do not produce any effect on crystallite size. On the other hand, the Ojen sample suffers a decrease in its crystallite size with up to 80 h treatment time, remaining unchanged for longer treatments. The crystallite sizes in the [00l] direction are much smaller for the Ojen sample than for the Santa Olalla sample. In addition, the Santa Olalla sample maintains the typical laminar shape after sonication, while the Ojen sample suffers a morphological change. The different behaviours seem to be related to the different compositions and, therefore, the different layer charges of both vermiculite samples.