Abstract
Kinetic studies for the non-isothermal decomposition of unirradiated and γ-irradiated silver acetate with 103 kGy total γ-ray doses were carried out in air. The results showed that the decomposition proceeds in one major step in the temperature range of (180–270 °C) with the formation of Ag2O as solid residue. The non-isothermal data for un-irradiated and γ-irradiated silver acetate were analyzed using Flynn-Wall-Ozawa (FWO) and nonlinear Vyazovkin (VYZ) iso-conversional methods. These free models on the investigated data showed a systematic dependence of Ea on α indicating a simple decomposition process. No significant changes in the thermal decomposition behavior of silver acetate were recorded as a result of γ-irradiation. Calcinations of γ-irradiated silver acetate (CH3COOAg) at 200 °C for 2 hours only led to the formation of pure Ag2O mono-dispersed nanoparticles. X-ray diffraction, FTIR and SEM techniques were employed for characterization of the synthesized nanoparticles.
Highlights
Thermal treatment of inorganic substances has great synthetic potential as it may turn simple compounds into advanced materials, such as ceramics, catalysts, and glass and could reproducibly lead in most cases to metal or metal oxide nanoparticles displaying a very narrow size distribution [1].Many recent studies on the thermal decomposition of inorganic solids have included measurements on samples that were exposed to radiation prior to heating with the air to investigate the effect of ionizing radiation on the kinetics and thermal decomposition behavior of inorganic compounds [2]
Thermal decomposition behavior of un-irradiated and γ-irradiated silver acetate was investigated in air with the aim to (a) examine the kinetics of non-isothermal, decomposition of both unirradiated and γ-irradiated silver acetate using a model free iso-conversional approach and compare the results with those obtained in our previously reported investigation using model fitting method [4] (b) to clarify the effects of, γ-irradiation on the thermal decomposition behavior, and (c) to follow the chemical composition of the solid residue obtained at different temperatures while attempting to prepare Ag2O at nanoscale by thermal decomposition of silver acetate in the air
The TG curve showed that decomposition of silver acetate (CH3COOAg) proceeds, in one major decomposition step in the temperature range of 200–280 °C, the formation of Ag(0) as solid residue
Summary
Thermal treatment of inorganic substances has great synthetic potential as it may turn simple compounds into advanced materials, such as ceramics, catalysts, and glass and could reproducibly lead in most cases to metal or metal oxide nanoparticles displaying a very narrow size distribution [1]. Many recent studies on the thermal decomposition of inorganic solids have included measurements on samples that were exposed to radiation prior to heating with the air to investigate the effect of ionizing radiation on the kinetics and thermal decomposition behavior of inorganic compounds [2]. Silver acetate is a suitable metallic organic compound for preparation of silver nanoparticles for medical applications such as diagnostic biomedical optical imaging, and biological implants like heart valves [3]. Thermal decomposition behavior of un-irradiated and γ-irradiated silver acetate was investigated in air with the aim to (a) examine the kinetics of non-isothermal, decomposition of both unirradiated and γ-irradiated silver acetate using a model free iso-conversional approach and compare the results with those obtained in our previously reported investigation using model fitting method [4] (b) to clarify the effects of, γ-irradiation on the thermal decomposition behavior, and (c) to follow the chemical composition of the solid residue obtained at different temperatures while attempting to prepare Ag2O at nanoscale by thermal decomposition of silver acetate in the air
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