Materials Engineering and Energy Technology Research Groups, Engineering Sciences, University of Southampton, Southampton, UK.
Nanotechnology. 2012 Feb 17;23(6):065705. doi: 10.1088/0957-4484/23/6/065705. Epub 2012 Jan 17.
The long term stability of natural halloysite nanotubes was studied at room temperature (22 ± 2 °C) in pure water, acidic and basic aqueous suspensions. The structural and morphological transformations of nanotubes were studied by TEM, SEM, nitrogen adsorption, XRD Raman and FTIR spectroscopy accompanied by monitoring the concentration of dissolved Si(IV) and Al(III) in solution. It has been revealed that, in 1 mol dm(-3) H(2)SO(4) solution, the dissolution of halloysite is initiated on the inner surface of nanotubes, leading to the formation of amorphous spheroidal nanoparticles of SiO(2) whereas, in 1 mol dm(-3) NaOH solution, dissolution of the inner surface of nanotubes is accompanied by the formation of Al(OH)(3) nanosheets.
研究了在室温和（22 ± 2）℃的纯水中，以及酸性和碱性水悬浮液中，天然埃洛石纳米管的长期稳定性。通过 TEM、SEM、氮吸附、XRD 拉曼和 FTIR 光谱分析，并监测溶液中溶解的 Si（IV）和 Al（III）的浓度，研究了纳米管的结构和形态转变。结果表明，在 1 mol dm(-3) H(2)SO(4)溶液中，埃洛石的溶解是从纳米管的内表面开始的，导致形成无定形的球形 SiO(2)纳米颗粒，而在 1 mol dm(-3) NaOH 溶液中，纳米管的内表面的溶解伴随着 Al(OH)(3)纳米片的形成。
