Synthesis of mono-dispersed silicalite-1 nanocrystals in water-surfactant-organic solvent.
Synthesis of mono-dispersed silicalite-1 nanocrystals in water-surfactant-organic solvent.
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DOI：
10.1166/jnn.2009.j068
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发表时间：
2009
影响因子：
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通讯作者：
T. Tago;Kazuyuki Iwakai;M. Nishi;T. Masuda
中科院分区：
文献类型：
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作者：
T. Tago;Kazuyuki Iwakai;M. Nishi;T. Masuda
在本文中，我们报道了一种在由聚氧乙烯（15）油基醚/环己烷体系组成的水-表面活性剂-有机溶剂中通过水热合成制备单分散silicalite-1纳米晶体的方法。成功制备了直径约60 nm的单分散silicalite-1纳米晶。发现晶体尺寸取决于表面活性剂浓度和添加到表面活性剂-有机溶剂中的水溶液的量。研究了表面活性剂浓度和水溶液量对晶体形态和尺寸的影响，以阐明水-表面活性剂-有机溶剂中形成silicalite-1纳米晶体的机制。由于表面活性剂共存于合成溶剂中，因此认为胶束结构和/或表面活性剂影响silicalite-1的成核和晶体生长速率，从而影响晶体尺寸。通过改变W/S值，晶体尺寸可控制在60至1000 nm范围内。
In this paper, we report a method for preparing mono-dispersed silicalite-1 nanocrystals via hydrothermal synthesis in a water-surfactant-organic solvent consisting of a polyoxyethylene (15) oleyl-ether/cyclohexane system. Mono-dispersed silicalite-1 nanocrystals of approximately 60 nm diameter were successfully prepared. It was found that the crystal size depended on both the surfactant concentration and the amount of water solution added to the surfactant-organic solvent. The effects of the surfactant concentration and the amount of water solution on crystal morphology and size were investigated to clarify the mechanism underlying the formation of silicalite-1 nanocrystals in water-surfactant-organic solvent. Since the surfactant coexisted in the synthetic solvent, it was considered that the micellar structure and/or surfactants affected the rates of nucleation and crystal growth of silicalite-1, thus affecting crystal size. Crystal size was controllable within the range of 60 to 1000 nm by changing the W/S values.