Model Free Approach for Non-Isothermal Decomposition of Un-Irradiated and g-Irradiated Silver Acetate: New Route for Synthesis of Ag2O Nanoparticles

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.

Carbon nanotubes/silver nanoparticles/poly(azo-thiourea) hybrids: Morphological, tensile and conductivity profile

“…Oxidation of Ag(0) and formation of silver oxide (Ag 2 O) during melt compounding was characterized by a sharp exothermic peak centered at &350 C (Figure 8) in melt nanocomposites. The broad exothermic peak could be ascribed to the formation of silver oxide, 33 whereas no such peak was detected in the case of solution system.…”

Thermal Decomposition of Silver Acetate: Physico-Geometrical Kinetic Features and Formation of Silver Nanoparticles

“…Because of their utilities for various purposes, syntheses of Ag-NPs and their structural and composite materials via thermal decomposition of solid precursors have been extensively studied using different Ag compounds as precursor materials. − Among others, the thermal decomposition of silver acetate ,,− ,,,,,− has been studied for preparing nanowires, , nanorods, and catalysts, and these products have been used in electric devices. ,, Logvinenko et al and Siffiqui et al , determined the apparent kinetic parameters for the thermal decomposition under linearly increasing temperatures in flowing inert gas and in air. Further extension of the kinetic characterization of the thermal decomposition process from the viewpoints of physico-chemistry and physico-geometry would provide direct information useful for controlling the reaction process and the properties of the Ag-NP product.…”

Phenomenological Interpretation of the Multistep Thermal Decomposition of Silver Carbonate To Form Silver Metal

“…Since the discovery of the special physical and chemical properties of metal nanoparticles, gaining an understanding of the thermal decomposition of Ag compounds has grown in importance. Among the different synthetic methods of Ag nanoparticles, spray pyrolysis and ultrasonic spray pyrolysis techniques are relevant to the thermal decomposition of Ag compounds. − The thermal decompositions of organometallic Ag compounds and Ag compounds in polymer matrices are also known to directly provide Ag nanoparticles or composite materials. − Even the very simple Ag compound silver acetate has been extensively studied as a possible precursor for Ag nanoparticle production via thermal decomposition. − For these compounds, the appropriate reaction temperatures and reaction pathways for the formation of Ag nanoparticles have been experimentally clarified, and the changes in size and shape of the product nanoparticles as a function of the reaction conditions have been discussed. − Some studies have been focused on the determination of the kinetic parameters and possible physicochemical or physicogeometrical reaction models through formal kinetic analyses of thermal decomposition processes. ,,, The kinetics of the thermal decomposition of solids are controlled by interactions between consecutive and concurrent processes associated with different physicochemical events, including surface nucleation, destruction of reactant crystals, crystal growth of the product solid, and diffusional removal of gaseous product. , It must be noted that these physicochemical events take place with time and are strongly regulated by the geometrical factors originating from the heterogeneity of the reaction. Such features have been clearly described for the thermal decomposition of silver malonate by Galwey and Mohamed .…”

“…4−22 Some studies have been focused on the determination of the kinetic parameters and possible physicochemical or physicogeometrical reaction models through formal kinetic analyses of thermal decomposition processes. 3,5,19,21 The kinetics of the thermal decomposition of solids are controlled by interactions between consecutive and concurrent processes associated with different physicochemical events, including surface nucleation, destruction of reactant crystals, crystal growth of the product solid, and diffusional removal of gaseous product. 23,24 It must be noted that these physicochemical events take place with time and are strongly regulated by the geometrical factors originating from the heterogeneity of the reaction.…”