SUPERCONDUCTIVITY IN THE Bi-Pb-Sr-Ca-Cu-O SYSTEM DOPED WITH Sb

1990 ◽  
Vol 04 (01) ◽  
pp. 131-141 ◽  
Author(s):  
J. HEIRAS ◽  
W. KRAUSS ◽  
C. POLITIS
Keyword(s):  
Transition Temperature ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
X Rays ◽  
Superconducting Transition ◽  
Melting Behaviour ◽  
Superconducting Properties ◽  
Thermo Gravimetric ◽  
Preparation Methods ◽  
Annealing Conditions

Doping of Bi-Pb-Sr-Ca-Cu-O HTSC's with Sb have been attempted with the purpose of increasing the transition temperature. Several different preparation methods were investigated in which the composition and annealing conditions were varied; ρ vs T and χ vs T measurements were carried out to determine the superconducting properties of samples. X-rays, differential thermal analysis (DTA) and thermo gravimetric analysis (TG) were performed to study the structure and the melting behaviour of samples. However, it was found that, at least for the conditions tested, Sb has no effect in increasing the transition temperature of this system. The maximum superconducting transition temperature observed in the system Bi 2−x Pb x Sr 2 Ca 2 Cu 3 O y was T c,o = 108 K which was completely independent of the doping with Sb.

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.

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.

scholarly journals Development of Nervilia fordii Extract-Loaded Electrospun PVA/PVP Nanocomposite for Antioxidant Packaging

Foods ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1728
Author(s):  
Peng Wen ◽  
Teng-Gen Hu ◽  
Yan Wen ◽  
Ke-Er Li ◽  
Wei-Peng Qiu ◽  
...  
Keyword(s):  
Food Packaging ◽  
Thermo Gravimetric Analysis ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Poly Vinyl Alcohol ◽  
Total Phenolic ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
Phenolic And Flavonoid ◽  
Thermal Stability Of

An ethyl acetate extract from of Nervilia fordii (NFE) with considerable suppression activity on lipid peroxidation (LPO) was first obtained with total phenolic and flavonoid contents and anti-LPO activity (IC50) of 86.67 ± 2.5 mg GAE/g sample, 334.56 ± 4.7 mg RE/g extract and 0.307 mg/mL, respectively. In order to improve its stability and expand its application in antioxidant packaging, the nano-encapsulation of NFE within poly(vinyl alcohol) (PVA) and polyvinyl(pyrrolidone) (PVP) bio-composite film was then successfully developed using electrospinning. SEM analysis revealed that the NFE-loaded fibers exhibited similar morphology to the neat PVA/PVP fibers with a bead-free and smooth morphology. The encapsulation efficiency of NFE was higher than 90% and the encapsulated NFE still retained its antioxidant capacity. Fourier transform infrared spectroscopy (FTIR) and X-ray powder diffraction (XRD) analysis confirmed the successful encapsulation of NFE into fibers and their compatibility, and the thermal stability of which was also improved due to the intermolecular interaction demonstrated by thermo gravimetric analysis (TGA). The ability to preserve the fish oil’s oxidation and extend its shelf-life was also demonstrated, suggesting the obtained PVA/PVP/NFE fiber mat has the potential as a promising antioxidant food packaging material.

The Experimental Study on Combustion Characteristics of Corn Straw and Coal Gangue

2011 ◽  
Vol 135-136 ◽  
pp. 1057-1059
Author(s):  
Heng Tao Zhou ◽  
Yong Wei
Keyword(s):  
Thermo Gravimetric Analysis ◽  
Combustion Characteristics ◽  
Combustion Characteristic ◽  
Gravimetric Analysis ◽  
Characteristic Parameters ◽  
Corn Straw ◽  
Kinetics Analysis ◽  
Thermo Gravimetric ◽  
Ignition Characteristic ◽  
Coal Residue

With a thermo gravimetric analysis apparatus combustion characteristics experiments of coal residue cornstalk and mixtures of them were done at 20 C/min heating rate. Then the combustion characteristic Parameters were obtained by above experiments. The c combustion activation energies were acquired by kinetics analysis. The results show those: the ignition characteristic and synthesis combustion characteristic of coal residue are bad. The ignition characteristic and synthesis combustion characteristic of cornstalk are better. The combustion characteristics of the mixture of coal residue and cornstalk are determined by mixing ratio. The ratio of cornstalk is more and the synthesis combustion characteristic is better.

Grafting of Chitosan: Structural, Thermal and Antimicrobial Properties

2019 ◽  
Vol 41 (2) ◽  
pp. 240-240
Author(s):  
Nevin Cankaya Nevin Cankaya
Keyword(s):  
Antimicrobial Activity ◽  
Graft Copolymers ◽  
Thermo Gravimetric Analysis ◽  
Antimicrobial Properties ◽  
Gravimetric Analysis ◽  
Analysis Method ◽  
Methacryloyl Chloride ◽  
Thermo Gravimetric ◽  
Thermal Stabilities ◽  
Ft Ir

In this study, some new chitosan materials were synthesized by the grafting of chitosan with the monomers such as 1-vinylimidazole (VIM), methacrylamide (MAm) and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS). First of all, chitosan methacrylate was prepared by esterification of primary -OH group with methacryloyl chloride a 25.13% yield by mole. The monomers were grafted into chitosan methacrylate via free radical polymerization using 2,2and#39;-Azobisisobutyronitrile as an initiator in N,N-dimethylformamide. The graft copolymers were characterized by FT-IR spectra and elemental analysis. Thermal stabilities of the graft copolymers were determined by TGA (thermo gravimetric analysis) method. The synthesized chitosan methacrylate and its graft copolymers were tested for their antimicrobial activity against bacteria and yeast.

Functionalization of α-ZrP by 1,2-Epoxypropane for Further Modification

2017 ◽  
Vol 898 ◽  
pp. 2347-2353
Author(s):  
Ahmed Hossamaldin ◽  
Ping Liu ◽  
Ya Du ◽  
Xiao Ze Jiang ◽  
Bin Sun ◽  
...  
Keyword(s):  
Epoxy Group ◽  
Thermo Gravimetric Analysis ◽  
Mas Nmr ◽  
Interlayer Distance ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
Grafting Ratio ◽  
Internal Surfaces ◽  
Carbon Mass ◽  
Ft Ir

To prepare alpha zirconium phosphate (α-ZrP) with high interlayer distance, grafting ratio and thermal stability, 1,2-epoxypropane was used to modify α-ZrP as the epoxy group reacting with P-OH on the external and internal surfaces of α-ZrP to form P-O-C bonds after small amines pre-intercalation. Different characterization techniques were used, including X-ray Powder Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), Thermo-Gravimetric Analysis (TGA) and Carbon Mass Nuclear Magnetic Resonance (13C MAS NMR). The results of XRD confirmed the pre-intercalation of amino-propane and the intercalation of 1,2-epoxypropane, as the interlayer distance increased from 7.5 Å to 16.9 Å and 15.3 Å, respectively. FT-IR and 13C MAS NMR results confirmed the formation of P-O-C bonds between 1,2-epoxypropane and α-ZrP. TGA analysis showed that the grafting ratio of 1,2-epoxypropane was 19.44%.

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