Abstract
Synthetic amorphous aluminum phosphate (AlPO 4) particles were treated with monohexyl, monooctyl, and monodecyl phosphates in acetone, and the resulting materials were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric and differential thermal analyses (TG/DTA), and adsorption of N 2. XRD patterns of the modified samples showed a strong diffraction peak and two weak ones below 2θ = 15°. The d-values of these peaks linearly increased with elongating of alkyl groups of the phosphates. After the treatment, particle size increased without formation of new particles. These results reveal that a multilayer alternating bimolecular layer of alkyl phosphates and aluminum phosphate phase is formed on the surface of AlPO 4 particles by the modification with alkyl phosphates. The layered structure disappeared on outgassing above 300°C, accompanying the removal of alkyl groups, formation of mesopores, and variation of surface structure.
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