نتایج جستجو برای: thermal decomposition kinetics

تعداد نتایج: 402421  

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2000
abdolsamad zarrin ghalam moghaddam ali akbar hashemi pour rafsanjani

simultaneous thermal analysis (sta) method has been applied to study decomposition reactions of ap under a flowing nitrogen atmosphere and static air. results obtained indicate that a phase transformation occurs prior to the decomposition reaction. decomposition takes place exothermally in two stages, first stage of decomposition could be suppressed by the controlled heating programme. addition...

ژورنال: مواد پرانرژی 2018

Potassium nitrate as oxidant is one of the main components in the some pyrotechnic compounds. This salt is the cheapest amongst the alkali nitrates and naturally available that widely used in pyrotechnic compounds of infrared, flare and delay compounds. Consequently, the investigation its thermal properties have considerable significance such as thermal stability, lifetime, enthalpy, deflagrati...

Journal: :Chemical reviews 2003
Alfred Vogel Vasan Venugopalan

1. Ablation Threshold 612 2. Ablation Enthalpy 613 3. Ablation Efficiency 613 C. Mechanistic Models 613 1. Steady-State Vaporization Models 614 2. Thermomechanical Models 614 D. Molecular Dynamics Simulations 615 VIII. UV and IR Ablation 615 A. Tissue Absorption Coefficients 615 B. Ablation without Stress Confinement 617 1. Temperature Rise and Thermal Diffusion 617 2. Kinetics of Tissue Decomp...

Abbas Agha Bozorgi Mohamamd Taghi Taghizadeh,

The thermal decomposition of 86 % vinyl chloride 14 % vinyl acetate copolymer wasstudied by the conductometry technique in the presence of nitrogen. The kinetics of stability andthermal degradation of vinyl chloride- co- vinyl acetate (PVC- co- PVAc) copolymer withcopper, copper oxide and tricalcium dicitrate (st) were investigated at various temperatures (150-180 oC ) in solution. The rate coe...

2007
W. R. Zeng W. K. Chow B. Yao

Chemical kinetics on thermal decomposition of polystyrene was studied by integrating the non-isothermal differential and integral methods. For decomposition of polystyrene in environment with only nitrogen, a mass loss stage was found at 282.9C to 398.2C. The maximum mass-loss rate was at 372.4C. Kinetic analysis results indicated that it is a first-order chemical reaction. Thermal decompositio...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2011
hui wei liao lan mu min zhen yan yan meng

nano-cufe2o4 catalysts with different cu/fe molar ratios (cunfemo(n+1.5m)) were prepared by hydrothermal method. the thermal decomposition performance of cunfemo(n+1.5m) on cuso4 were determined with tg-dsc method to evaluate its catalytic activity and the roasted product was characterized by xrd. the results showed that cunfemo(n+1.5m) had superior catalytic properties and efficiency to cuso4 ...

2012
WILMA CYRIL

The thermal properties of copper (II) 8hydroxy quinoline -5 sulphonic acid has been investigated. The thermal decomposition occurs in three stages. All the three stages of decomposition follow one after the other without any stable compound in between showing that the complex is volatile. The kinetics of the thermal decomposition of the complex has been studied using thermogravimetry (TG) in co...

2012
Andréia de Haro Moreno Hérida Regina Nunes Salgado

Stability study of ceftazidime was realized in order to investigate kinetics of degradation of this drug both in powder for injection and reconstituted sample. Ceftazidime was submitted to conditions of accelerated thermal degradation and photodegradation. Analyses of the degraded samples were performed by microbiological assay and decomposition reactions could be described by zero-order and se...

Journal: :international journal of nano dimension 0
a. hosseinian department of engineering science, faculty of engineering, university of tehran,tehran, iran. a.r. mahjoub department of chemistry, tarbiat modares university,tehran ,iran m. movahedi department of chemistry, payame noor university, isfahan, iran.

a new tris-chelate cd(ii) complex, [cd(dadmbtz)3](clo3)2 has been successfully synthesized and characterized by ir, 1h, 13c nmr spectroscopy, elemental analysis and single crystal x-ray determination. the thermal behavior, uv-vis and fluorescence spectra of compound were studied. in reaction with dadmbtz, cadmium (ii) forms a tris-chelate complex with nearly c3 symmetry for coordination polyhed...

Journal: :journal of nanostructures 2012
a. dehno khalaji k. jafari s. maghsodlou rad

in this paper, cuo nanoparticles  have been synthesized via solid-state thermal decomposition using copper(ii) schiff base complexes as new precursors at 600ºc under air atmosphere for 3 h. surface morphology of the products were characterized by fourier transform infrared spectroscopy (ft-ir), x-ray diffraction (xrd) and scanning electron microscopy (sem).

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