Search Results

You are looking at 21 - 30 of 4,465 items for :

  • "decomposition" x
  • All content x
Clear All

Abstract  

The complex thermal analysis was used in the investigations of the carbonate reaction products in the residue after Al leaching from calcium aluminate-12CaO7Al2O3 and Selfdisintegrated Powder. The conversion of Al was calculated basing on a content of Al in the pregnant solution as well as in a residue obtained from the kinetic investigations. The third method of measurements of a conversion of Al was presented and discussed. Results show, that the proposed method can be used for conversion estimations with 95% of confidence level as well as for the detection of carbonate products and is useful for an interpretation of the new approach for kinetic mechanism of Al leaching.

Restricted access

Abstract  

Iron(II), cobalt(II) and nickel(II) oxalates were synthesized as nanofractals inside the voids of the photonic crystals based on SiO2. Guest substances undergone polythermic decomposition within the pores of the photonic crystals in helium atmosphere containing of oxygen traces (∼1 Pa) under static conditions. Pyrolysis of Fe(COO)2·2H2O, Co(COO)2·2H2O and Ni(COO)2·2H2O studied by TG and DSC techniques results in the formation of the metal oxides. The nanoparticles of Fe2O3, CoO (Co3O4) and NiO populated the interspheric voids of the photonic crystals exhibited no ferromagnetic effects indicating that no metallic inclusions were formed in helium in the presence of O2 traces. The exothermic effect was observed by the thermal decomposition of the cobalt(II) oxalate only under oxygen lack.

Restricted access

Decomposition of perfluoropolyether lubricants

A study using TG–MS in the presence of alumina powder

Journal of Thermal Analysis and Calorimetry
Authors: Mimi Y. Keating and Jon L. Howell

temperatures. The decomposition of oils, challenged by mixing with alumina powder, is either catastrophically or resistively to an extent. Materials Structures of PFPE lubricant and additives: The Kaytox® XHT-1000

Restricted access

Thermal decomposition of hydromagnesite

Effect of morphology on the kinetic parameters

Journal of Thermal Analysis and Calorimetry
Authors: D. Bhattacharjya, T. Selvamani, and Indrajit Mukhopadhyay

for the synthesis of other magnesium-based materials [ 2 – 5 ]. Hydromagnesite is also a well-known bridging component in ancient magnesian lime mortars [ 6 ]. Thermal decomposition of hydromagnesite is usually associated with an endothermic break down

Restricted access

. The synthesis of proper nickel hydroxide, suitable for the synthesis of the mentioned mesoporous oxide materials, is an intricate problem. The thermal decomposition of nickel hydroxide is a complex process that includes both the dehydration and

Restricted access

, W. , Direct methods for primary decomposition, Invent. Math. , 110(2) (1992), 207–235. MR 1185582 93j :13032 Vasconcelos W. Direct methods for primary decomposition

Restricted access
Journal of Thermal Analysis and Calorimetry
Authors: A. Obaid, A. Alyoubi, A. Samarkandy, S. Al-Thabaiti, S. Al-Juaid, A. El-Bellihi, and El-H. Deifallah
Restricted access

Abstract  

The authors present the results concerning the thermal behaviour of three polynuclear coordination compounds of Nd(III) and Co(II) or Fe(III) with triptophan. For the dehydration steps the values of the non-isothermal kinetic parameters have been determined.

Restricted access

volatile matter and burning of carbon and, finally, the decomposition of mineral matter. In kinetic calculations, oxidation of lignite and oil shale is described by the first-order kinetics, at that higher activation energy values are obtained at higher

Restricted access