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Effect of the residual water content in gels on solution combustion synthesis temperature


The composition of gels and xerogels, as well as their transformation during heating and dehydration, determine the thermochemistry of solution combustion synthesis reactions. An improved descriptive thermodynamic model of combustion processes was formulated on the basis of the investigated formation of complex compounds of metal ions with organic fuel (glycine, citric acid, urea, and PVA) in nitrate solutions. The intensity of SCS reactions was found to depend on the strength of Ni2+–ligand complexes. The effect of heat loss during combustion on the ΔTmax value was analyzed for the model system Ni(NO3)2·nH2O–Fuel–H2O. It was found the heat loss occurs due to the presence of various amounts of structurally-bound water in gels and xerogels before the combustion.

The temperature profiles of combustion during the synthesis of NiO with different types of fuel at φ = 1.0.


  • Nitrate/fuel ratios affect the formation of a hypergolic mixture of gases.

  • The intensity of SCS reactions depends on the strength of Ni2+–ligand complexes.

  • Water in the xerogel has a great impact on the maximal thermal effect.

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The work was carried out in accordance with the state assignment for the Institute of Solid State Chemistry of the Ural Branch of Russian Academy of Sciences (theme No АААА-А19-119031890026-6) and the Ministry of Science and Higher Education of the Russian Federation in the framework of Increase Competitiveness Program of NUST «MISiS» (№ К2-2019-007), implemented by a governmental decree dated 16th of March 2013, N 211.

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Correspondence to Sh. M. Khaliullin or D. O. Moskovskikh.

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Khaliullin, S.M., Zhuravlev, V.D., Bamburov, V.G. et al. Effect of the residual water content in gels on solution combustion synthesis temperature. J Sol-Gel Sci Technol 93, 251–261 (2020).

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  • Solution combustion synthesis
  • Complex formation
  • Metal nitrates
  • NiO
  • Thermochemical characteristics