scholarly journals Synthesis, Spectral and Thermo-Gravimetric Analysis of Novel Macromolecular Organo-Copper Surfactants

2018 ◽  
Vol 5 (1) ◽  
pp. 145-157 ◽  
Author(s):  
Anju Joram ◽  
Rashmi Sharma ◽  
Arun K. Sharma
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Free Energy ◽  
Thermogravimetric Analysis ◽  
Edible Oils ◽  
Thermo Gravimetric Analysis ◽  
Spectral Studies ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
Structural Insight

Background: The present paper highlights: Synthesis of copper surfactants derived from edible oils i.e. Groundnut & Sesame and non-edible oils i.e. Neem & Karanj. Methods: Spectral studies (IR, NMR) have been carried out to understand the structural insight of the surfactants synthesized. Results and Conclusion: Thermogravimetric analysis of copper surfactants derived from Groundnut, Sesame, Neem & Karanj has been done to confirm the thermal decomposition/stability. Kinetic parameter i.e. activation energy and thermodynamic parameters i.e. Gibbs free energy, entropy and enthalpy were calculated by five different well-known equations namely Freeman Carroll, Coats - Redfern, Horowitz – Metzger, Broido, and Piloyan –Novikova.

Spectroscopic Characterization and Thermo-Gravimetric Analysis of Bioactive Copper 2-Amino 6-Methyl Benzothiazole Complexes Derived from Various Oils

2019 ◽  
Vol 9 (1) ◽  
pp. 58-76 ◽  
Author(s):  
Anju Joram ◽  
Rashmi Sharma ◽  
Arun Kumar Sharma
Keyword(s):  
Thermal Decomposition ◽  
Edible Oils ◽  
Biological Activities ◽  
Thermo Gravimetric Analysis ◽  
Spectroscopic Characterization ◽  
Vital Role ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
Significant Information ◽  
Natural Oils

Background:Surfactants most characteristic phenomenon of micellization in the bulk phase, as well as their ability to be accumulated at an interface are of immense theoretical, applied and biological interests as indicated by large number of publication of papers and reviews in last three decades. Particulars information about Copper (II) soaps derived from natural oils, play a vital role in its selection in specific phenomena such as foaming, wetting, detergency, emulsification etc. and also in their use as herbicides, fungicides, pesticides and insecticides etc. The tendency of Copper soaps have complex formation with compounds containing donor atoms like N, S, O, Br, etc. as benzothiazole and other related compounds play significant role in biological activities due to the presence of nitrogen and sulphur atoms, which are responsible for their pharmacological activities.Objective:The copper surfactants derived from various edible (Groundnut and Sesame oils) and non-edible oils (Neem and Karanj oils) and their complexes with nitrogen and sulphur containing ligands such as 2-amino-6-methyl-benzothiazole have been synthesized and studied for their structural aspects, which were confirmed using various techniques like IR, NMR and ESR spectroscopy. Thermogravimetric analysis of complexes which is derived from already synthesized copper (II) soaps with 2-amino-6-methyl benzothiazole was done to confirm the thermal decomposition.Methods:Thermo Gravimetric Analysis (TGA) has been used to study the thermal decomposition of copper surfactants complexes to evaluate their energy of activation and various thermodynamic parameters i.e. Gibbs free energy, enthalpy, entropy have been calculated. Copper surfactants and their benzothiazole complexes were studied to test the validity of various equations namely Freeman Carroll, Coats - Redfern, Horowitz - Metzger, Broido, and Piloyan-Novikova related to thermal degradation.Results:The degradation occurs in three steps and the value of activation energy is highest for third step and smallest for the first steps. CNB and CKB need higher energy to degrade than CGB and CSB. The all copper surfactants molecules have negative entropy, which indicates that the decomposition reactions proceed with a lower rate.Conclusion:Thermogravimetric degradation analysis will also provide significant information about the removal of the natural soap segment from the environment. The studies will be very important for pollution controlling and in the field of Green Chemistry.

scholarly journals The influence of VO2(B) nanobelts on thermal decomposition of ammonium perchlorate

2015 ◽  
Vol 33 (3) ◽  
pp. 560-565 ◽  
Author(s):  
Yifu Zhang ◽  
Xianfang Tan ◽  
Changgong Meng
Keyword(s):  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Ammonium Perchlorate ◽  
Vanadium Dioxide ◽  
Thermo Gravimetric Analysis ◽  
Great Influence ◽  
Decomposition Temperature ◽  
Gravimetric Analysis ◽  
Thermal Decomposition Temperature ◽  
Thermo Gravimetric

Abstract The influence of vanadium dioxide VO2(B) on thermal decomposition of ammonium perchlorate (AP) has not been reported before. In this contribution, the effect of VO2(B) nanobelts on the thermal decomposition of AP was investigated by the Thermo- Gravimetric Analysis and Differential Thermal Analysis (TG/DTA). VO2(B) nanobelts were hydrothermally prepared using peroxovanadium (V) complexes, ethanol and water as starting materials. The thermal decomposition temperatures of AP in the presence of I wt.%, 3 wt.% and 6 wt.% of as-obtained VO2<B) nanobelts were reduced by 39 °C. 62 °C and 74 °C, respectively. The results indicated that VO2(B) nanobelts had a great influence on the thermal decomposition temperature of AP Furthermore, the influence of the corresponding V2Os, which was obtained by thermal treatment of VO2(B) nanobelts, on the thermal decomposition of AP was also investigated. The resufs showed that VO2(B) nanobelts had a greater influence on the thermal decomposition temperature of AP than that of V2Os.

scholarly journals CO2 Gasification Kinetics of Shenhua Bituminous Coal by Isothermal Thermo-Gravimetric Analysis

2020 ◽  
Author(s):  
Jinzhi Zhang ◽  
Zhiqi Wang ◽  
Ruidong Zhao ◽  
Jinhu Wu
Keyword(s):  
Activation Energy ◽  
Bituminous Coal ◽  
Thermo Gravimetric Analysis ◽  
Correlation Coefficients ◽  
Mathematical Expression ◽  
Frequency Factor ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
Kinetics Of ◽  
Compensation Relationship

Abstract This research performed the gasification kinetics of three Shenhua coal under CO2 atmosphere using isothermal thermogravimetry. Results showed that isothermal gasification curves for three different coal samples revealed different gasification behaviour. Among the eleven kinetic models, A2 was the most suitable one to describe the gasification kinetics of three coal samples, because it can reproduce the experimental data very well with reasonable correlation coefficients. The activation energy for sample A, B and C were 95.9, 79.1, and 69.4 kJ mol-1, respectively. The activation energy decreased with the increase of the particle size. The compensation relationship was observed between activation energy and frequency factor, and the mathematical expression was lnA=0.1041 E+0.54028 with the correlation coefficients of 0.999.

Activation Energy of Decomposition of Y2bacuo5 Compound in Wet Co2 at Elevated Temperatures

1989 ◽  
Vol 169 ◽  
Author(s):  
John J. Simmins ◽  
Michael J. Hanagan ◽  
Gary S. Fischman ◽  
Robert L. Snyder
Keyword(s):  
Activation Energy ◽  
Elevated Temperatures ◽  
Barium Carbonate ◽  
Thermo Gravimetric Analysis ◽  
Time Derivative ◽  
Simultaneous Thermal Analysis ◽  
Analysis Data ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Thermo Gravimetric

AbstractDecomposition of the Y2BaCuO5 in C02 was studied using simultaneous thermal analysis (STA) and X-ray diffraction (XRD). The time derivative to the thermo-gravimetric analysis data (DTG) was used to calculate the activation energy. The activation energy of decomposition by CO2 into barium carbonate, copper oxide and yttrium oxide was found to be <

ANNEALING AND PHOTOINDUCED EFFECTS IN ELECTROCHEMICALLY SYNTHESIZED Hg-1212 FILMS

2005 ◽  
Vol 19 (27) ◽  
pp. 4021-4046
Author(s):  
D. D. SHIVAGAN ◽  
P. M. SHIRAGE ◽  
S. H. PAWAR ◽  
TANAY SETH ◽  
D. P. AMALNERKAR
Keyword(s):  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Annealing Temperature ◽  
Thermo Gravimetric Analysis ◽  
Decomposition Temperature ◽  
Gravimetric Analysis ◽  
Thermal Decomposition Temperature ◽  
Superconducting Properties ◽  
Thermo Gravimetric ◽  
Flowing Oxygen

The thermo-gravimetric analysis (TGA) and differential thermal analysis (DTA) of the as-deposited and electrochemically oxidized Hg 1 Ba 2 Ca 1 Cu 2 O 6+δ( Hg -1212) samples were carried out in air, flowing oxygen and nitrogen environment in order to estimate the thermal decomposition temperature and hence to maintain the annealing temperature and atmosphere. After annealing, electrochemically synthesized films showed an increase in Tc from 104.7 K to 119 K and Jc values from 1.43×103 to 4.3×103 A/cm 2. Electrochemically oxidized Hg -1212 films in under-, optimally- and over-doped states were irradiated with a Red He – Ne laser (2mW) and the Tc was found to increase from 104.7 K to 106 K and Jc from 1.43×103 to 1.89×103 A/cm 2. The effects of annealing and photo-irradiation on structural, microstructural and superconducting properties of electrochemically synthesized Hg-1212 films were investigated and discussed in detail in this paper.

Thermo Gravimetric Analysis Study of PMMA/TiO2 Nanocomposites

2013 ◽  
Vol 832 ◽  
pp. 816-820
Author(s):  
N.N. Hafizah ◽  
Mohamad Hafiz Mamat ◽  
Mohd Hanafiah Abidin ◽  
Che Mohd Som Said ◽  
Mohamad Rusop
Keyword(s):  
Thermal Decomposition ◽  
Particle Size ◽  
Thermo Gravimetric Analysis ◽  
Polymer Chains ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Thermo Gravimetric ◽  
Analysis Study ◽  
X Ray ◽  
Filler Size

The polymer matrix of poly (metyl methacrylate) (PMMA) has been introduced with the titanium dioxide (TiO2) nanopowder to study the effects of the TiO2size on the properties of the nanocomposites. The particle size is playing an important role in determining the properties of the nanocomposite. The decrease the filler size has increase the thermal decomposition of the nanocomposites due to the higher amount of the filler between the polymer chains. The results of X-ray diffraction (XRD) and Energy Dispersive X-Ray Spectrometry (EDS) also were discussed in this paper.

Thermo-Gravimetric Analysis and Kinetic Study of Biomass Pyrolysis

2013 ◽  
Vol 800 ◽  
pp. 509-516 ◽  
Author(s):  
Yong Sheng Fan ◽  
Xiao Hua Li ◽  
Yi Xi Cai ◽  
Wei Dong Zhao ◽  
Hai Yun Yin
Keyword(s):  
Activation Energy ◽  
Heating Rate ◽  
Thermo Gravimetric Analysis ◽  
Evaluation Methodology ◽  
Gravimetric Analysis ◽  
Pyrolysis Process ◽  
Biomass Pyrolysis ◽  
Thermo Gravimetric ◽  
Exponential Factor ◽  
Kinetics Of

In order to realize the optimization of pyrolysis process, the pyrolysis characteristics and kinetics of common agriculture and forestry biomass were studied. Four kinds of biomass were chosen as experiment materials for thermo-gravimetric experiment. The Characteristics of biomass pyrolysis was studied by defining a new evaluation methodology. The method of Coats-Redfern was used to analyze pyrolysis kinetics of biomass pyrolysis process. The results of research show that the pyrolysis process of biomass can be divided into three stages, including drying and preheating, fast pyrolysis and slow decomposition of residue. The activation energy of pyrolysis reaction of biomass during the low temperature stage is higher than that of the high temperature stage. The values of the activation energy and pre-exponential factor are increasing with the increase of heating rate. The pyrolysis of biomass in the main pyrolysis zone can be effectively described by using the kinetic model n=2. The heating rate of 15K/min and temperature of 500°C can improve the reaction rate, and it helps to reduce energy consumption of the reaction.

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