Nano-aluminum-phosphate via a polymerized organic–inorganic complex route

Influence of the pH and ageing time on the acid aluminum phosphate synthesized by precipitation

“…The amorphous character of the synthesized phosphate makes difficult its characterization and the evaluation of its acid character. In order to solve this problem, 31 P and 27 Al MAS-NMR study has been performed. Moreover, 1 H-31 P CP-MAS-NMR was used in order to observe the acid characteristic of the phosphate.…”

“…[20][21][22][23] Several works on phosphate synthesis are reported in the literature [24][25][26][27] and some of them are focused on aluminum phosphate synthesis [28][29][30] and its thermal evolution. 31 However, most studies refer to the orthophosphate case as has been mentioned above. Acid aluminum phosphate chemistry (monohydrogen or dihydrogen) is complex and different results of synthesis and thermal behaviour are reported in the literature.…”

Nanoclay and carbon nanotubes as potential synergists of an organophosphorus flame-retardant in poly(methyl methacrylate)

“…The diffuse band possessing a peak near 1060 cm À1 and a shoulder around 960 cm À1 in the spectrum for PMMA/OP18 correspond to phosphate stretching vibrations such as that of PO 4 3-in boron phosphates [28] and PO 3 2-in aluminium phosphates [29]. Bending vibrations of structural OH appear as a small peak at 1620 cm À1 and a shallow band peaking at 3100 cm À1 (not shown on the spectra), typical of hydrated amorphous aluminium phosphates [29]. The residue from CNT-PMMA/OP18 shows similar phosphate absorption bands with flame-retarded PMMA that contains no filler nanoparticles.…”

Acid-based geopolymers: Understanding of the structural evolutions during consolidation and after thermal treatments

“…It is thus essential to understand the temperature-dependant structural evolutions of those samples. This AlPO 4 compound, comprised of PO 4 3-and AlO 4 5tetrahedrons, can be synthetized by the heat treatment of hydrated aluminophosphate sources extracted from natural materials such as variscite (AlPO 4 .2H 2 O) [14] or from synthetic materials such as AlPO 4 -H5 usually obtained by sol-gel route [ 15 ]. It is also a refractory phase isostructural with silica with many polymorphs, the most common ones being berlinite (hexagonal), cristobalite (triclinic, hexagonal) and tridymite (orthorhombic, cubic) [ 16 ].…”