Formation of silica nanotubes with spring-like pore channels in the walls

A chiral low-molecular-weight amphiphile, l-16Val6PyBr, was synthesized from l-valine, which can cause physical gels in water, benzene and nitrobenzene. Silica nanotubes with spring-like pore channels in the walls were prepared using the self-assemblies of it as templates via a single-templating approach. The morphologies and pore architectures of the silica nanotubes were studied using transmission electron microscopy (TEM), field-emission scanning electron microscopy, powder X-ray diffraction and N2 sorptions. The TEM images taken after different reaction times indicated a cooperation mechanism. Moreover, nanoworms with concentric circular pore channels and nanoflakes with vertical pore channels were prepared by changing the concentration of the catalyst.

► A single-templating approach was developed. ► Silica nanotubes with spring-like pore channels in the walls were prepared. ► A cooperation mechanism was revealed. Nanoworms with concentric circular pore channels were prepared. ► Nanoflakes with vertical pore channels were prepared.