CEREGE, Aix-Marseille University, CNRS, CDF, IRD, Europole Mediterraneen de L'Arbois, BP 80, 13545 Aix en Provence, France.
J Am Chem Soc. 2009 Dec 2;131(47):17080-1. doi: 10.1021/ja9076952.
To date, the successful low-temperature synthesis of the aluminosilicate imogolite nanotubes always involved initial concentrations of the reagents in the millimolar range, higher concentrations being reported to lead to the formation of the less well characterized allophane phase. The present work shows that reaction kinetics and not initial concentration control the formation of the nanotubes: substantial amounts of well formed imogolite were obtained from a decimolar initial concentration, i.e. 100 times higher than the "standard" protocol. The allophane-like spheroids expected from the high reagent concentration were not observed in this work, and proto-imogolite was obtained instead.
迄今为止，成功低温合成的铝硅酸盐埃洛石纳米管总是涉及试剂的初始浓度在毫摩尔范围内，较高的浓度被报道会导致形成特征较差的无定形相。本工作表明，反应动力学而非初始浓度控制着纳米管的形成：从 10 分摩尔的初始浓度，即比“标准”方案高 100 倍的浓度中，获得了大量形态良好的埃洛石。在这项工作中，没有观察到高试剂浓度下预期的类无定形球体，而是得到了原埃洛石。
