Synthesis and Characterization of Al(OH)3, Al2O3 Nanoparticles and Polymeric Nanocomposites

Abstract

Applying of the most toxic halogenated and aromatic flame retardants is limited with respect to the environmental requirements. Nontoxic Al(OH) 3 nanoparticles were synthesized via a simple surfactant-free precipitation reaction at room temperature. The effect of various precipitation-agents on the morphology of the products was investigated. Al(OH) 3 nanoparticles were added to the polysulfone and poly styrene (PS) matrices. Electron microscope images show excellent dispersion of aluminium hydroxide in PS matrix. Nanoparticles appropriately enhanced both thermal stability and flame retardant property of the polymeric matrices. The enhancement of flame retardancy is due to endothermic decomposition of Al(OH) 3 that absorbs heat and simultaneously releases of water (makes combustible gases diluted and cold). Dispersed nanoparticles play the role of a barrier layer against flame, oxygen and polymer volatilization. Al(OH) 3 was converted to Al 2 O 3 and its photo-catalyst property in degradation three different organic dyes as pollutants was investigated.

PANI-derived polymer/Al2O3 nanocomposites: synthesis, characterization, and electrochemical studies

“…100 nm diameter, similar to that observed in literature [45]. On the other hand, TEM images of nanocomposite samples show that the Al 2 O 3 nanoparticles are finely dispersed into polymer matrix.…”

“…For example, alumina has a large surface area, adsorption capacity, and shows good wear resistance [20,21], so it is commonly used as catalyst, catalyst support, filter, and filler for polymers to improve mechanical properties [22,23]. At least, seven different transitional aluminas have been reported and Al 2 O 3 nanoparticle is perhaps, the most important one for its industrial applications [13,15,24,45].…”

Chemical Treatment of Waste Abaca for Natural Fiber-Reinforced Geopolymer Composite

“…The decrease in tensile strength of the samples could be attributed to these extractions. In addition, characteristic peak of Al(OH) 3 at 990 cm − 1 corresponding to Al–O bonds [43] was observed in the spectra of NaOH-then-Al 2 (SO 4 ) 3 treated abaca fiber, and the precipitate or residues from the spent solution. Thus, the FTIR results confirm the possible formation of Al(OH) 3 during neutralization and its deposition on the abaca surface.…”

Structure and properties of porous ceramics obtained from aluminum hydroxide

“…On the one hand this method is effective in terms of management of the pore volume, but on the other hand the possible formation of carbon on the inner surfaces of porous material is unacceptable for the manufacture of bio-implants and can lead to rejection of the implant. To form a multi-level pore structure without addition of pore-former one can use the method of decomposition of components, for example, the hydroxides to oxides, accompanied by the release of gas and, as a consequence, the formation of porosity [4]. This method based on the decomposition of aluminum hydroxide to the oxide has been known for a long time [5], but there is no data on the regulation of the pore space volume and the dependence of the pore space formation sintered at different temperatures, particle size of initial powders, as well as no data about dependences of the strength of the ceramic with changing of porosity.…”