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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.


Papers
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Journal ArticleDOI
TL;DR: A process was developed for the microencapsulation of inorganic filler particles with poly-methyl-methacrylate, to increase the interaction between the hydrophilic filler particles and a polymer matrix.
Abstract: A process was developed for the microencapsulation of inorganic filler particles with poly-methyl-methacrylate, to increase the interaction between the hydrophilic filler particles and a polymer matrix. The filler utilised was aluminium hydroxide with an average diameter of 1.9 microm and a specific surface area of 5 m2/g. The process comprised a surface modification, in which a monolayer of isopropoxy titanium isostearate was chemically bound to the surface to render it hydrophobic and to ensure a chemical bond between the filler and the organic phase. Then, an encapsulation reaction was carried out by means of an emulsion-like polymerization process at monomer starved conditions. The modified particles were stabilized in water with sodium-dodecyl-sulphate. A redox system consisting of cumene-hydroperoxide in combination with sodium-formaldehyde-sulphoxylate and iron(II) salt was applied for the initiation of the polymerization. Besides surface polymer, free polymer particles were also formed. The parameters which varied were the filler concentration, the concentration of the initiator components and the surfactant concentration. At optimum conditions, approximately 50% of the added monomer polymerized at the modified filler surface, thus forming encapsulated filler particles. SEM together with TGA analysis indicated that a smooth polymer layer had been formed on the filler surface. At high filler loading, however, coagulation occurred.

9 citations

Journal ArticleDOI
TL;DR: The influence of aluminium cation as a strong electrophilic centre on the thermolysis of chlorophenols chemisorbed on Al(OH)3 surface was investigated and five isomers of dimeric compounds of resonance stabilised 2,4,6-trichlorophenoxy radical were found.

9 citations

Patent
16 Dec 1994
TL;DR: In this paper, a process for the production of plastic sanitary articles based on polymethyl methacrylate having improved thermal properties by the casting resin process is described, in which a suspension of the liquid, polymerisable, organic precursor is transferred into a shaping mold and cured in a manner known per se and subsequently demoulded, characterised in that the particulate filler FS is selected from the group consisting of aluminium oxide, aluminium hydroxide, aluminium oxide hydrate, aluminium dioxide hydrate and silicon dioxide, with the proviso that the average particle size of the
Abstract: The invention relates to a process for the production of plastic sanitary articles based on polymethyl methacrylate having improved thermal properties by the casting resin process, in which a suspension of the liquid, polymerisable, organic precursor is transferred into a shaping mould and cured in a manner known per se and subsequently demoulded, characterised in that the particulate filler FS is selected from the group consisting of aluminium oxide, aluminium hydroxide, aluminium oxide hydrate, magnesium hydroxide and silicon dioxide, with the proviso that the average particle size of the filler particles FS is in the range from 20 to 60 mu m, and that the particles have been silanised by means of a non-ethylenically unsaturated silanising reagent.

9 citations

Journal ArticleDOI
TL;DR: In this paper, the authors studied the kinetics of decomposition of hydrogen peroxide on mixed Fe(III−Al(III) hydroxide and oxide catalysts, and suggested a suitable mechanism.
Abstract: The kinetics of decomposition of hydrogen peroxide have been studied on mixed Fe(III)−Al(III) hydroxide and oxide catalysts. While iron hydroxide possesses considerable catalytic activity, aluminium hydroxide has very little activity. The rate of decomposition on mixed hydroxides increases with increasing concentration of aluminium hydroxide up to about 1.5 mol% and decreases thereafter. The mixed oxides possess negligible activity compared to the corresponding hydroxides. The energy of activation, as calculated from the Arrhenius equation, is 10.1 kcal/mol for sample S4, containing 1.52 mol% of alumina. The rate of decomposition of S4 increases with increasing pH up to 6.8 and decreases thereafter. The rate is first order in all these cases. A suitable mechanism is suggested.

9 citations

Journal ArticleDOI
TL;DR: The combination of oral aluminium and citrate should be avoided in patients with poor renal function and the high aluminium concentration was attributed to the concurrent use of an oral citrate solution.
Abstract: 1. A hospitalized patient with renal failure receiving oral aluminium hydroxide was found to have a blood aluminium level of 3124 micrograms/l (116 mumol/l). 2. The extremely high aluminium concentration was attributed to the concurrent use of an oral citrate solution which converted the aluminium to a more soluble and absorbable form. 3. The combination of oral aluminium and citrate should be avoided in patients with poor renal function.

9 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20234
202222
202123
202031
201936
201863