Synthesis of alumina powder by the urea–glycine–nitrate combustion process: a mixed fuel approach to nanoscale metal oxides

Abstract

Main objective of present work is to study the efficiency of mixed fuel towards solution combustion synthesis of alumina powder, which otherwise prepared by single fuel and study of properties of final product with mixed fuel approach. Two different fuels, glycine and urea, along with aluminium nitrates have been used to prepare nanophase alumina powder. Different fuel to oxidizer ratios and different percentage combination of two fuels were used to prepare six samples. In all samples, nanoscale particle size obtained. Parameter which continuously changes the results of various characterisations is percentage combination of two fuels. In case where percentage of urea is higher than glycine reaction takes place with high exothermicity and hence crystallinity in product phase, whereas glycine promotes amorphous character. With mixed fuel approach, crystallinity can be enhanced easily, by calcinations of powder product at low temperature, because due to mixed urea and glycine, there is already some fraction of crystallinity observed. Overall mixed fuel approach has ability to produce nanophase alumina powder with wide range of particles size.

Microwave‐assisted pyrolysis of organometallic gel prepared through ternary combination of surfactants for fabrication of nano‐porous gamma alumina: adsorptive properties, characterization

“…This technique is a unique method that is a combination of chemical sol–gel and pyrolysis methods. A very rapid exothermic reaction occurs between metal nitrates and an appropriate fuel 8 . The reaction occurs at a low temperature and progresses rapidly.…”

“…In the synthesis of γ‐Al 2 O 3 by the pyrolysis method, the appropriate fuel is glycine; 15 however, urea or carbamide has been employed as a fuel in the fabrication of several inorganic compounds 8 . Two NH 2 groups are linked by a carbonyl (CO) group in urea, CO(NH 2 ) 2 .…”

“…Urea, and glycine are used to fabricate the nanoparticles of metal oxides 10,15 . While the crystallinity of nanoparticles is promoted by the employment of urea, glycine leads to extension of amorphous phase 8 . Very few studies have been reported for the application of surfactant in the synthesis γ‐Al 2 O 3 by the pyrolysis technique.…”

Thermoluminescence Properties of Aluminium Oxide doped Strontium, Lithium and Germanium prepared by Combustion Synthesis method

“…With the development of newer technologies, there are several other techniques to synthesize the material with low cost and easy to handle [7] such as sol-gel technique [8] on beam implantation [9], solvent evaporation [10] and combustion synthesis (CS) [5.11,12]. Among wet chemical methods, CS is an effective, and low-cost method to produce various industrially useful materials [13,14]. The solution preparation for combustion synthesis is quick and easy [15].…”

Thermoluminescence study of aluminium oxide doped germanium prepared by combustion synthesis method

“…The TL properties of Al2O3 samples of different dopants materials which can enhance TL properties have been studied by several researches for nearly 50 years [1,2] The materials were generally synthesized by sol-gel method [3], ion beam implantation [4], solvent evaporation [5] and combustion synthesis (CS) [6,7,8]. Among this method, combustion synthesis (CS) is an effective and low-cost method for production of various industrially useful materials [9,10]. The solution preparation only requires low processing temperatures and short reaction times (̰seconds) making it a quick and easy process [11,12,13].…”