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.

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.

Effect of ZrO2 Nanofiller on the Physical Properties of Epoxy Composites: Mechanical, Thermal and Dielectric

2021 ◽  
Vol 14 (5) ◽  
pp. 425-435
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Thermo Gravimetric Analysis ◽  
Thermal Characteristics ◽  
Zirconium Oxychloride ◽  
Precipitation Method ◽  
Zro2 Nanoparticles ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
Zirconia Nanoparticles

Abstract: In this present work, Zirconia nanoparticles were prepared by precipitation method, Zirconium Oxychloride (ZrOCl2.8H2O) and ammonia (NH3) as starting materials. The synthesized Zirconia nanoparticles were characterized by XRD and the grain size in nanoscale was confirmed. The sheets of neat epoxy resin and epoxy with addition of ZrO2 nanoparticles are primed by solution casting method. The structures of epoxy polymer and hardener were found out using FTIR analysis. The thermal properties were analyzed using Thermo Gravimetric Analysis (TGA) and Differential Thermal Analysis (DTA). Thermo gravimetric analysis has been employed to investigate the thermal characteristics and their mode of thermal degradation. Differential thermal analysis has been used to determine the glass transition temperature of epoxy nanocomposites. The mechanical properties like tensile and flexural studies were analyzed and thus influences of nanofiller loading on these parameters were found to be very low. Keywords: Epoxy, ZrO2 nanoparticles, Nanocomposites, Thermal stability, Dielectric properties, Tensile strength, Flexural strength.

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.

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.

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.

Rapid Assessment of Use Safety for Silicone Rubber Pad by Thermo-Gravimetric Analysis

2017 ◽  
Vol 865 ◽  
pp. 73-78
Author(s):  
Guo Jun Song ◽  
Yang Li ◽  
Pei Yao Li ◽  
Zheng Gu ◽  
Jian Guo Gao ◽  
...  
Keyword(s):  
Silicone Rubber ◽  
Rapid Assessment ◽  
Thermo Gravimetric Analysis ◽  
Decomposition Temperature ◽  
Polymer Materials ◽  
Gravimetric Analysis ◽  
Temperature Zone ◽  
Thermo Gravimetric ◽  
The Right ◽  
The Relationship

Thermo-gravimetric technology was used to rapidly evaluate and measure safe use life of food contact polymer materials. The thermo-gravimetric curve showed that silicone rubber pad decomposition temperature was about 350°C in air and the maximum decomposition rate was 450°C. 370°C, 380°C, 390°C, 400°C, 410°C at the right temperature zone was chosen to do thermo-gravimetric constant temperature experiments; the time of silicon rubber pad’s weightlessness of 5%, 10% 15% was calculated by the above curve, respectively. Finally Arrhenius equation was used to establish the relationship between temperature and time; and then the result of infer silicone rubber pad using life was 1.37 thousand times when it was used as a baking tray.

Powder X-ray diffraction and thermal decomposition correlation studies of nano-crystalline styrene-maleic anhydride graft copolymer-ZnO composites

e-Polymers ◽  
2012 ◽  
Vol 12 (1) ◽  
Author(s):  
Inderjeet Kaur ◽  
Bikram Singh ◽  
Parveen Bhatt ◽  
Sarvjeet S. Bhatt
Keyword(s):  
Thermal Decomposition ◽  
Graft Copolymers ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Thermo Gravimetric ◽  
Nano Composite ◽  
X Ray ◽  
Nano Crystalline ◽  
Styrene Maleic Anhydride

AbstractNano-crystalline (nc) polymer-ZnO composite material has been successfully synthesized by treating styrene-maleic anhydride (SMA) and its graft copolymers with acrylic acid, (AAc), and acrylamide, (AAm), synthesized by chemical method with different wt% ratios of nZnO (40 nm), prepared indigenously in our laboratory, to yield polymer-ZnO nano-composite material. Characterization of SMA, grafted SMA, nc-SMA-ZnO, nc-grafted SMA-ZnO composites was carried out by X-ray diffraction and thermo-gravimetric analysis. Both the studies show an interesting correlation between X-ray and thermal data. XRD pattern of SMA copolymer shows it to be amorphous, while SMA-g-poly(AAc) and SMA-gpoly( AAm) graft copolymers show crystalline orthorhombic structure having (102) orientation with particle size of nano dimensions (44 and 40 nm respectively). Addition of nZnO to nc-SMA-g-poly(AAc) and nc-SMA-g-poly(AAm) shows appreciation in the crystalline behavior with increased intensity of the peaks in the XRD patterns. Thermo-gravimetric analysis (TGA) of SMA shows single stage decomposition with regular loss of weight while nc-SMA-g-poly(AAc) and nc-SMAg- poly(AAm) graft copolymers respectively show an abrupt weight loss up to 25% and 45% at 121.370C and thereafter proceeds with regular decomposition. However, the corresponding composite of SMA with nZnO (10 wt%) shows an abrupt weight loss of 50% similar to grafted SMA while the ZnO embedded composites of AAc and AAm grafted SMA lose 95% of the weight abruptly at the same temperature i.e.121.37 °C. The increased abrupt loss in nZnO- SMA and nZnO-nc-SMA grafted composite is correlated to the increased crystallinity upon addition of nZnO particles to the polymer system. Because of the spontaneous thermal decomposition and release of large amount of heat energy, the newly synthesized nano-composite polymer material can find use as high energy material

Coordination Compounds of Some 3d-Transition Metal Ions with N1-[4-(4-bromo-phenylsulfonyl)-benzoyl]-N4-(4-methoxyphenyl)- thiosemicarbazide

2008 ◽  
Vol 59 (7) ◽  
Author(s):  
Madalina Angelusiu ◽  
Maria Negoiu ◽  
Stefania-Felicia Barbuceanu ◽  
Tudor Rosu
Keyword(s):  
Coordination Compounds ◽  
Magnetic Moments ◽  
Thermo Gravimetric Analysis ◽  
Electronic Spectroscopy ◽  
Transition Metal Ions ◽  
Synthesis And Characterization ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
New Compounds

The paper presents the synthesis and characterization of Cu(II), Co(II), Ni(II), Cd(II), Zn(II) and Hg(II) complexes with N1-[4-(4-bromo-phenylsulfonyl)-benzoyl]-N4-(4-methoxyphenyl)-thiosemicarbazide. The new compounds were characterized by IR, EPR, electronic spectroscopy, magnetic moments, thermo-gravimetric analysis and elemental analysis.

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