Insights into the physicochemical aspects from natural halloysite to silica nanotubes
Insights into the physicochemical aspects from natural halloysite to silica nanotubes
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DOI：
10.1016/j.colsurfa.2012.08.003
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发表时间：
2012-11
期刊：
影响因子：
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通讯作者：
Yi Zhang;Liangjie Fu;Huaming Yang
中科院分区：
文献类型：
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作者：
Yi Zhang;Liangjie Fu;Huaming Yang
以天然埃洛石纳米管（HNTs）为原料，采用酸浸法制备了SiNTs。透射电子显微镜（TEM）和扫描电子显微镜（SEM）的图像显示，SiNTs保持HNTs的形态。SiNTs的比表面积（183.6m2/g）和孔容（0.74cm3/g）是HNTs的3倍，表明SiNTs表面的活性基团比HNTs多。用29 Si核磁共振（NMR）和傅里叶变换红外光谱（FTIR）跟踪了化学结构的变化。NMR谱表明，HNTs的Q2结构（Si（OSi）2（OH）2）和Q4骨架结构（Si（SiO）4）消失，Q3结构（Si（SiO）3（OH））部分发生化学位移。光致发光（PL）分析表明，合成的SiNTs具有比HNTs更高的蓝光强度，这表明合成的SiNTs在光局域化和光学器件领域具有潜在的应用价值。
Silica nanotubes (SiNTs) were synthesized by acid-leaching the natural halloysite nanotubes (HNTs). Transmission electron microscopy (TEM) and scanning electron microscope (SEM) images showed that SiNTs retained the morphology of HNTs. The specific surface area (183.6m2/g) and pore volume (0.74cm3/g) of SiNTs were three times higher than those of HNTs, which indicated more active groups on the surface of SiNTs than HNTs. The29Si nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FTIR) were used to trace the variations of chemical structures. NMR spectroscopy demonstrated the disappearance of Q2structure (Si(OSi)2(OH)2) and Q4framework structure (Si(SiO)4), and the partial chemical shift of Q3structure (Si(SiO)3(OH)) from HNTs to SiNTs. Photoluminescence (PL) analysis showed the higher blue PL intensity of SiNTs than that of HNTs, which indicated that the as-synthesized SiNTs could have potential application in the fields of light localization and optical devices.