Abstract
Theoretical model for the simulation of synthesis of Janus-like particles (JP) consisting two different phases using the Carbon Combustion Synthesis of Oxides (CCSO) is presented. The model includes the variation of sample initial porosity, carbon concentration and oxygen flow rate used to predict the formation of JP features. The two temperature (2T) combustion model of chemically active submicron-dispersed mixture of two phases including ferroelectric and ferromagnetic was implemented and assessed by using the experimentally estimated activation energy of 112±3.3 kJ/mol and combustion temperature. The experimental values allowed to account the thermal and concentration expansion effect along with the dispersion by the slip-jump simulation for high Knudsen numbers. The model predicted that the smaller initial porosity of the combustion media creates higher formation rate of Janus-like particles. The simulation of slippage and jumps of the gas temperature allowed the scale-bridging between macro- and micro- structures.
Highlights
Janus particles are special types of asymmetric particles whose surfaces have two or more distinct physical properties and chemical compositions within a single particle [1,2,3]
The model predicts that 90%, 85% and 80% of product is synthesized at the instance time t = 0.1 for porosity of χ = 0.025, 0.05, and 0.12, respectively
The variable porosity strongly depends on volumetric expansion of the sample
Summary
Janus particles are special types of asymmetric particles whose surfaces have two or more distinct physical properties and chemical compositions within a single particle [1,2,3]. Carbon combustion synthesis of oxides (CCSO) was applied for quick and energy efficient production of multiferroic composite of cobalt ferrite and barium titanate to form Janus-like particles (JP) matrix structure [8]. The processes of propagation of combustion waves were studied with the application of production of solid phase particles by self-propagating high-temperature synthesis (SHS) and CCSO [24,25]. The features of the influence of slip processes, temperature jumps and concentrations of the gas phase components on the propagation of the combustion wave and the synthesis of nickel-zinc ferrite in a channel with a cooled side wall and pores of submicron diameter have been studied. We generalized the two-temperature model [20, 21] on investigation the thermal and mass dispersion and expansion effect on synthesis JP via CCSO in porous media. The sintering simulation using a non-linear viscous material theory [27] is not considered
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