scholarly journals Synthesis and characterization of polyaniline-polyvinyl chloride blends doped with sulfamic acid in aqueous tetrahydrofuran

2006 ◽  
Vol 4 (4) ◽  
Author(s):  
Sadia Ameen ◽  
Vazid Ali ◽  
M. Zulfequar ◽  
M. Mazharul Haq ◽  
Mushahid Husain
Keyword(s):  
Activation Energy ◽  
Structural Changes ◽  
Sulfamic Acid ◽  
Dc Conductivity ◽  
Synthesis And Characterization ◽  
Chemical Doping ◽  
Two Phase ◽  
Fixed Amount ◽  
Exponential Factor

AbstractThe temperature dependence of direct current (dc) conductivity was studied for various samples of polyaniline-polyvinylchloride (PANI-PVC) blended films. Polyaniline was doped with different concentrations of sulfamic acid in aqueous tetrahydrofuran (THF) and the blended films were prepared by varying the amount of doped PANI relative to a fixed amount of PVC. The dc conductivity of PANI-PVC blended films was measured to determine the effect of sulfamic acid (dopant) in the temperature range (300–400K). The mechanism of conduction is explained by a two-phase model. In order to evaluate the effect of the dopant, conductivity-derived parameters such as the pre-exponential factor (σ o) and the activation energy (ΔE) were calculated. The structural changes of polyaniline-PVC blended films were characterized by FTIR spectroscopy that explores information about the suitability of the dopant in the chemical doping process.

scholarly journals «Green» synthesis and characterization of galactomannan sulfates obtained using sulfamic acid

2020 ◽  
Author(s):  
Aleksandr S. Kazachenko ◽  
Yuriy N. Malyar ◽  
Natalya Yu. Vasilyeva ◽  
Galina N. Bondarenko ◽  
Irina V. Korolkova ◽  
...  
Keyword(s):  
Green Synthesis ◽  
Sulfamic Acid ◽  
Synthesis And Characterization

Synthesis and Characterization of Optically Active Poly(N-Acryloyl-L-alanine) in Ionic Lliquids

2014 ◽  
Vol 1035 ◽  
pp. 464-468
Author(s):  
Rui Fan ◽  
Jin Shui Yao
Keyword(s):  
Ethyl Acetate ◽  
Phase Transfer ◽  
Condensation Reaction ◽  
Optically Active ◽  
Synthesis And Characterization ◽  
Ammonium Bromide ◽  
Acryloyl Chloride ◽  
Two Phase ◽  
Tetrabutyl Ammonium

The chiral monomer,N-acryloyl-L alanine, was synthesized by condensation reaction between acryloyl chloride and L-alanine using ethyl acetate and water as two-phase solvents, tetrabutyl ammonium bromide as phase transfer catalyst and ethyl acetate as the extraction solvent.And then, poly (N-acryloyl-L-alanine) was successfully prepared by free radical polymerization of above synthesized monomer using 2,2'-Azobis (2-methylpropionitrile) AIBN as initiator in ionic liquids. Their structures were characterized by1HNMR and IR. Optically activities were tested with Rotary Spectrometer. Melting point and glass transition temperature were tested with DSC. The molecular weight of the polymer was characterized with GPC.

Effect of iron chloride on the polaronic conduction in potassium phosphateglasses containing iron oxide

2000 ◽  
Vol 78 (12) ◽  
pp. 1091-1105 ◽  
Author(s):  
Y M Moustafa
Keyword(s):  
Activation Energy ◽  
Electrical Conductivity ◽  
Structural Changes ◽  
Small Polaron ◽  
Iron Chloride ◽  
Polaron Hopping ◽  
Exponential Factor ◽  
Order Of Magnitude ◽  
The Difference ◽  
Fe Ions

DC electrical conductivity measurements of Fe2O3–K2O–P2O5 glasses containing iron chloride have been carried out in the temperature range from room temperature to 360°C. The DC conductivity was analyzed in terms of small polaron hopping theory. The hopping regime between Fe ions was confirmed to be nonadiabatic. The increase in the conductivity was of the same order of magnitude as the change in the pre-exponential factor upon increasing the FeCl3 content. The decrease in the activation energy with increasing FeCl3 content was interpreted in terms of a decrease in the distance between the iron sites. The increase in electrical conductivity was ascribed to the difference in the activation energy. The variation in the conductivity parameters was interpreted in terms of the structural changes that take place upon increasing the FeCl3 content of the glasses. PACS No.72.20Ee

Synthesis and characterization of gold atomic clusters by the two-phase method

2009 ◽  
Vol 52 (1-3) ◽  
pp. 23-26 ◽  
Author(s):  
M. J. Rodríguez-Vázquez ◽  
C. Vázquez-Vázquez ◽  
J. Rivas ◽  
M. A. López-Quintela
Keyword(s):  
Atomic Clusters ◽  
Synthesis And Characterization ◽  
Phase Method ◽  
Two Phase

Structural Design and Synthesis of H3O+-β”/βAl2O3 and NH4-β”/β-Al2O3 Polycrystals

1988 ◽  
Vol 135 ◽  
Author(s):  
Patrick S. Nicholson
Keyword(s):  
Ion Exchange ◽  
Structural Design ◽  
Synthesis And Characterization ◽  
Total Weight Loss ◽  
Chemical Formula ◽  
Two Phase ◽  
Design And Synthesis ◽  
And Control

AbstractThe synthesis and characterization of H3Oβ”/β-Al2O3 and NH4 + -H3O+β”/β-Al2O3 poly-crystals is described. The role of stress development and control in the intermediate stages of ion-exchange of the NaK-β”/βA12O3 ceramics is analysed and identifies the β-Al2O3 phase as acting as inert reinforcement for the two-phase composite. The Rb + ion-exchange of the intermediate K + β”/β-Al2O3 requisite for NH4+/H3O + ion-exchange to NH4-H3O+β”/βAl2O3 is described as also is the NH4NO3 exchange to the final ceramic. The total weight loss on heating NH4-H3O+β”/βAl2O3 polycrystals to 810°C is 7.4% which agrees with the value expected from the chemical formula. The 25°C conductivity of the grains of NH4 +-H3O + β”/βAl2O3 was 1.7 × 10−4 (ω-cm)−1 and the bulk conductivity was 3 × 10−5(ω-cm)−1.

scholarly journals Synthesis and characterization of starch sulfates obtained by the sulfamic acid-urea complex

2020 ◽  
Vol 1208 ◽  
pp. 127899 ◽  
Author(s):  
Feride Akman ◽  
Alexandr S. Kazachenko ◽  
Natalya Yu. Vasilyeva ◽  
Yuriy N. Malyar
Keyword(s):  
Sulfamic Acid ◽  
Synthesis And Characterization ◽  
Urea Complex

scholarly journals Room temperature synthesis and characterization of novel lead-free double perovskite nanocrystals with a stable and broadband emission

2021 ◽  
Vol 9 (1) ◽  
pp. 158-163
Author(s):  
Yingying Tang ◽  
Leyre Gomez ◽  
Marco van der Laan ◽  
Dolf Timmerman ◽  
Victor Sebastian ◽  
...  
Keyword(s):  
Activation Energy ◽  
Low Temperature ◽  
Room Temperature ◽  
Double Perovskite ◽  
Lead Free ◽  
Synthesis And Characterization ◽  
Temperature Synthesis ◽  
Perovskite Nanocrystals ◽  
Broadband Emission

We demonstrated the synthesis of ultra small and stable Cs3BiBr6 nanocrystals, ∼1.5–3 nm, via a room-temperature antisolvent method. Red-shift of bandgap was observed in low temperature PL measurements with an activation energy of ∼41 meV.

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