Abstract
Publisher Summary This chapter discusses small angle X-ray scattering (SAXS) on tetrapropylammonium (TPA)-silicalite-1 precursor in clear solutions. The formation and growth of crystal nuclei of TPA-silicalite-1 from clear solutions using tetraethyl orthosilicate (TEOS) and silicic acid as silica sources are studied with SAXS. Information is obtained on the size and shape of the nanoscopic precursor particles of silicalite-1. The SAXS data can be interpreted assuming the presence of tablets of 4×2×1.3 nm up to 8×8×1.3 nm depending on the synthesis conditions. Starting solutions have been studied varying the silica source and the cations content. Although the nanoparticles differ in size, their shape is very similar, and these data strengthen the confidence that TPA-silicalite-1 formation is rather nanoblocks based aggregation mechanism than growth through monomer addition.
Published Version
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