Reactivity of aluminum nanopowders with metal oxides

Valliappan, S.; Swiatkiewicz, Jacek; Puszynski, Jan A.

doi:10.1016/j.powtec.2005.04.027

Cited by 89 publications

(38 citation statements)

References 7 publications

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“…Thus good dispersive mixing, to ensure powder homogeneity, is crucial for efficient and reliable combustion [3,8,9]. Good dispersion and mixing of nano-reactants is also essential for achieving maximum burning rates in a pyrotechnic mixture [10].…”

Section: Introductionmentioning

confidence: 99%

“…Mixing nanoparticles of metal and oxidizer by such conventional means can present an extreme fire hazard. Valliappan et al [10] developed a method in which very fine powder components of composite energetic material are dispersed and mixed in an organic solvent. At the nanometer scale, particle interactions become significantly more influential because of a higher tendency to agglomerate [11].…”

Section: Introductionmentioning

confidence: 99%

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The effect of Si–Bi2O3 on the ignition of the Al–CuO thermite

et al. 2011

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The ignition temperature of the Al-CuO thermite was measured using DTA at a scan rate of 50 C.min -1 in a nitrogen atmosphere. Thermite reactions are difficult to start as they require very high temperatures for ignition, e.g. for Al-CuO thermite comprising micron particles it is ca. 940 C. It was found that the ignition temperature is significantly reduced when the binary Si-Bi 2 O 3 system is added as sensitizer. Further improvement is achieved when the reagents are nano-sized powders. For the composition Al + CuO + Si + Bi 2 O 3 (65.3:14.7:16:4 wt %), with all components nano-sized, the observed ignition temperature is ca. 613 C and a thermal runaway reaction is observed in the DTA.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of Si–Bi2O3 on the ignition of the Al–CuO thermite

et al. 2011

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“…As the particle size decreases the surface to volume ratio increases dramatically (i.e., on the order of 1/radius). When mixed as a composite this increase allows for an increase in the number of contact points with the oxidizer and improved mixture homogeneity [13]. Also, on the nanoscale, the mechanism by which a reaction can occur will shift from diffusion to melt-dispersioncontrolled process [14,15].…”

Section: Introductionmentioning

confidence: 99%

Fast reactions with nano- and micrometer aluminum: A study on oxidation versus fluorination

Watson

Pantoya

Levitas

2008

Combustion and Flame

168

105

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“…Nano Al with WO 3 , MoO 3 , CuO, and Fe 2 O 3 formulations were also prepared by Valliappans 41 , et al who concluded that the combustion front velocity in AlCuO was strongly affected by the presence of surface functional coatings. Nano SiKClO 4 formulations were also studied for combustion velocity 17 .…”

Section: Preparation Of Nanooxidisersmentioning

confidence: 99%

Nanomaterials in Pyrotechnics

Sarawadekar¹,

Agrawal²

2008

DSJ

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Pyrotechnics consist of metallic powders as fuels and different oxidisers which generally have particle size of > 5 m. The use of nano materials is expected to increase intimate contact between fuel oxidiser, and therefore, development of nano pyrotechnics based on nano fuels oxidizers along with their synthetic routes is considered of great interest. In this review, methods for the preparation of powders of nanometals: aluminium (Al), nickel (Ni), copper (Cu), titanium (Ti), iron (Fe), silver (Ag), and cobalt (Co) and; metallic oxides: molybdenum trioxide (MoO 3 ), tungsten trioxide (WO 3 ), iron (III) oxide (Fe 2 O 3 ), copper (I) oxide (Cu 2 O), antimony trioxide (Sb 2 O 3 ), nickel oxide (NiO), manganese dioxide (MnO 2 ), and zirconium dioxide (ZrO 2 ) along with their characterisation are discussed. Some nano oxidisers such as PbCO 3 , Mg(OH) 2 , NH 4 ClO 4 , NH 4 NO 3 have also been reported. Further, some nano pyrotechnic formulations Al-MO 3 , Al-WO 3 , AlFe 2 O 3 , Al-AP, Al-Bi 2 O 3 , Al-CaO based on nanofuels oxidisers have also been formulated.

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Reactivity of aluminum nanopowders with metal oxides

Cited by 89 publications

References 7 publications

The effect of Si–Bi2O3 on the ignition of the Al–CuO thermite

The effect of Si–Bi2O3 on the ignition of the Al–CuO thermite

Fast reactions with nano- and micrometer aluminum: A study on oxidation versus fluorination

Nanomaterials in Pyrotechnics

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