The potentials of TiO2 nanocatalyst on HMX thermolysis

Hamed

J Inorg Organomet Polym

et al. 2021

Self Cite

Oxygen atoms on the surface of oxide catalysts have low coordination number; they are negatively charged. Surface oxygen can act active sites for decomposition of energetic nitramines (i.e. HMX); additionally hydrous surface can release active ȮH radicals. Colloidal oxide particles can fulfil these requirements. Furthermore oxide particles can induce thermite reaction with aluminium particles. This study reports on the facile fabrication of colloidal ferric oxide particles of 5 nm; Colloidal Fe 2 O 3 /Al binary mixture was integrated into HMX matrix via co-precipitation technique; uniform dispersion of nanothermite particles was verified using SEM. Naonothermite particles experienced dramatic change in HMX thermal behaviour with an increase in total heat release by 63 %. The impact of themrite particles on HMX kinetic decomposition was evaluated using an integral isoconversional method of KAS, and Kissinger models. The mean value of apparent activation was reduced by 23.5 % and 24.3 % using Kissinger and KAS models respectively. This dramatic change in HMX decomposition can be ascribed to the ferric oxide reactivity and the facile integration of colloidal thermite particles.

Section: Introductionmentioning

confidence: 99%

The Impact of Metastable Intermolrecular Nanocomposite Particles on Kinetic Decomposition of Heterocyclic Nitramines Using Advanced Solid‐Phase Decomposition Models

Hamed

J Inorg Organomet Polym

et al. 2021

Self Cite

“…While NC experienced mean activation energy of 430 KJ•mol -1 ; MnO2/Al/NC nanocomposite demonstrated mean activation of 388 KJ•mol -1 . MnO2 particles with negative oxygen surface and hydrous surface can act as efficient catalyst with decrease in activation enenrgy [7][8]13].…”

Section: Kinetic Parameters Via Kissinger Modelmentioning

confidence: 99%

“…Hydroxyl surface groups could be evolved at low temperature and could attack the NC cyclic ring with the release of active NO2 [4,12]. MnO2 particles could induce condensed phase reaction of gaseous products with the increase in decomposition enthalpy ( Figure 1) [13][14][15]. On the other hand aluminium can experience decomposition enthalpy of 32000 J/g; it is of interest as high energy density material [16].…”

Section: Introductionmentioning

confidence: 99%

Nitrocellulose Catalyzed With Manganese Oxide Nanoparticles: Advanced Energetic Nanocomposite With Superior Decomposition Kinetics

Saadoune

et al. 2021

Preprint

Self Cite

Nanostructured energetic materials can fit with advanced energetic first-fire, and electric bridges (microchips). Manganese oxide, with active surface sites (negatively charged surface oxygen, and hydroxyl groups) can experience superior catalytic activity. Manganese oxide could boost decomposition enthalpy, ignitability, and propagation rate. Furthermore manganese oxide could induce vigorous thermite reaction with aluminium particles. Hot solid or liquid particles are desirable for first-fire compositions. This study reports on the facile fabrication of MnO2 nanoparticles of 10 nm average particle size; aluminium nanoplates of 100 nm average particle size were employed. Nitrocellulose (NC) was adopted as energetic polymeric binder. MnO2/Al particles were integrated into NC matrix via co-precipitation technique. Nanothermite particles offered an increase in NC decomposition enthalpy by 150 % using DSC; ignition temperature was decreased by 8 0C. Nanothemrite particles offered enhanced propagation index by 261 %. Kinetic study demonstrated that nanothermite particles experienced drastic decrease in NC activation energy by - 42, and - 40 KJ mol-1 using Kissinger and KAS models respectively. This study shaded the light on novel nanostructured energetic composition, with superior combustion enthalpy, propagation rate, and activation energy.

“…Additionally ferric oxide can experience hydrous surface; free ȮH radical can be evolved and attack nitramine heterocyclic ring [2,[11][12]. Colloidal particles can secure hydrous surface.…”

Section: Introductionmentioning

confidence: 99%

The impact of metastable intermolrecular nanocomposite particles on kinetic decomposition of heterocyclic nitramines using advanced solid-phase decomposition models

Hamed

et al. 2021

Preprint

Self Cite

Oxygen atoms on the surface of oxide catalysts have low coordination number; they are negatively charged. Surface oxygen can act active sites for decomposition of energetic nitramines (i.e. HMX); additionally hydrous surface can release active ȮH radicals. Colloidal oxide particles can fulfil these requirements. Furthermore oxide particles can induce thermite reaction with aluminium particles. This study reports on the facile fabrication of colloidal ferric oxide particles of 5 nm; Colloidal Fe2O3/Al binary mixture was integrated into HMX matrix via co-precipitation technique; uniform dispersion of nanothermite particles was verified using SEM. Naonothermite particles experienced dramatic change in HMX thermal behaviour with an increase in total heat release by 63 %. The impact of themrite particles on HMX kinetic decomposition was evaluated using an integral isoconversional method of KAS, and Kissinger models. The mean value of apparent activation was reduced by 23.5 % and 24.3 % using Kissinger and KAS models respectively. This dramatic change in HMX decomposition can be ascribed to the ferric oxide reactivity and the facile integration of colloidal thermite particles.