Topic
Aluminium hydroxide
About: Aluminium hydroxide is a research topic. Over the lifetime, 2043 publications have been published within this topic receiving 22032 citations. The topic is also known as: Al(OH)3 & Amphojel.
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TL;DR: In this paper, the formation of a poorly ordered non-dialysable proto-imogolite species with an Al : Si ratio near 2, close to that of imogolites, was reported.
Abstract: Summary
Concentrations of dialysable silica in equilibrium with Al2O3-SiO2-H2O sols at pH 4.5–5.0 confirm the formation of a poorly ordered non-dialysable proto-imogolite species with an Al : Si ratio near 2, close to that of imogolite. Sols with Al : Si>2 give nearly constant levels of free silica in solution in the range 2–6 μg/cm3, indicating equilibrium between proto-imogolite and aluminium hydroxide species. These findings indicate that imogolite-like precipitates in acid soils will buffer silica in solution to within this range during leaching episodes. Imogolite is more stable than a previous estimate suggested, and a revised value for its free energy of formation is proposed: ΔG0f(298.15) = -2929.7 kJ/mol.
In Fe2O3-SiO2-H2O sols, the Fe : Si ratio of the non-dialysable species varies smoothly from 11 to 3 as free silica in solution ranges from 4 to 35 μg/cm3. Such sols are much less colloidally stable than hydroxyaluminium silicate sols, but mixed Al2O3—Fe2O3—SiO2—H2O sols are almost as stable as iron-free sols up to a Fe : Al ratio of 1.5. Thus migration of Al and Fe as mixed hydroxide sols can account for the almost constant ratio of Al to Fe with depth in oxalate extracts from Bs horizons of podzols.
98 citations
TL;DR: In this article, the corrosion behavior of two Mg-Al-Er alloys with increasing content of erbium (Mg 95 Al 3 Er 2 and Mg 95Al 2 Er 3 ) has been evaluated in borate buffer solution and compared with that of the commercial AM60 alloy (mg-6.0Al-0.13Mn, at%) employed in the automotive industry.
97 citations
TL;DR: In this paper, multicomponent M(II)/Al/Zr layered double hydroxides (LDHs) with Mg, Ni, and Zn, exhibiting single hydrotalcite-like phases by XRD, were obtained by coprecipitation at constant pH = 10.
Abstract: Multicomponent M(II)/Al/Zr layered double hydroxides (LDHs) with M(II) = Mg, Ni, and Zn, exhibiting single hydrotalcite-like phases by XRD, were obtained by coprecipitation at constant pH = 10. The...
97 citations
TL;DR: In this article, the formation of an aluminium hydroxide template, upon which Si(OH)4 will condense in competition with Al, was demonstrated to be a prerequisite to HAS formation.
95 citations
TL;DR: In this paper, magic angle spinning (MAS) NMR was used to investigate the chemical environment of P in soil and soil components, and the results of several experiments on excessively fertilized sandy soil material were discussed.
95 citations