Product Details of 17927-65-0. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: Aluminum(III) sulfate xhydrate, is researched, Molecular Al2H8O13S3, CAS is 17927-65-0, about Molten salt synthesis of mullite nanowhiskers using different silica sources. Author is Yang, Tao; Qiu, Peng-long; Zhang, Mei; Chou, Kuo-Chih; Hou, Xin-mei; Yan, Bai-jun.
Mullite nanowhiskers with Al-rich structure were prepared by molten salt synthesis at 1000°C for 3 h in air using silica, amorphous silica, and ultrafine silica as the silica sources. The phase and morphol. of the synthesized products were investigated by X-ray diffraction, SEM, energy dispersive spectroscopy, and transmission electron microscopy. A thermogravimetric and DTA was carried out to determine the reaction mechanism. The results reveal that the silica sources play an important role in determining the morphol. of the obtained mullite nanowhiskers. Clusters and disordered arrangements are obtained using common silica and amorphous silica, resp., whereas the use of ultrafine silica leads to highly ordered mullite nanowhiskers that are 80-120 nm in diameter and 20-30 μm in length. Considering the growth mechanisms, mullite nanowhiskers in the forms of clusters and highly ordered arrangements can be attributed to heterogeneous nucleation, whereas disordered mullite nanowhiskers are obtained by homogenous nucleation.
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