scholarly journals Submicrometric Fibrillar Structures of Codoped Polyaniline Obtained by Co-oxidation Using the NaClO/Ammonium Peroxydisulfate System: Synthesis and Characterization

2017 ◽  
Vol 57 (4) ◽  
Author(s):  
Jorge Enrique Osorio-Fuente ◽  
Carlos Gómez-Yáñez ◽  
María De los Ángeles Hernández-Pérez ◽  
Mónica De la Luz Corea-Téllez
Keyword(s):  
Electrical Conductivity ◽  
Co Oxidation ◽  
Sodium Hypochlorite ◽  
Polymerization Rate ◽  
Synthesis And Characterization ◽  
Aromatic Rings ◽  
Co Doping ◽  
Ammonium Peroxydisulfate ◽  
Structure Morphology ◽  
Morphology Changes

A mixture of ammonium peroxydisulfate and sodium hypochlorite (NaClO) (co-oxidating system) were used to obtain polyaniline (PANi) doped with HCl and camphorsulfonic acid (CSA) (co-doping). The effect of HCl/CSA ratio added during polymerization on structure, morphology and electrical conductivity of the conducting polymer was investigated. When NaClO is used, the polymerization rate is substantially increased and the morphology changes from micrometric granular to nanometric fibrillar. CSA was used as complementary dopant but also to improve the solubility of PANi in common solvents. However, results suggest that quinone-like heterocycles containing carbonyl radicals as well as phenazine-type aromatic rings might be impeding an efficient doping in detriment of the conductivity.

Synthesis and characterization of novel chiral derivatizing agents containing β-keto-anthracene adducts (KAAs) by 1H-NMR: aromatic influence and chiral alcohol absolute configuration determination

2019 ◽  
Vol 17 (3) ◽  
pp. 541-554
Author(s):  
Neeranuth Intakaew ◽  
Puracheth Rithchumpon ◽  
Chanatkran Prommin ◽  
Saranphong Yimklan ◽  
Nawee Kungwan ◽  
...  
Keyword(s):  
1H Nmr ◽  
Absolute Configuration ◽  
Synthesis And Characterization ◽  
Chiral Alcohols ◽  
Chiral Alcohol ◽  
Aromatic Rings ◽  
H Nmr ◽  
Chiral Derivatizing Agents

New chiral derivatizing agents and the effect of aromatic rings were investigated for absolute configuration of chiral alcohols via1H-NMR.

Synthesis and characterization of silver nanoparticle nanocomposite thin films with thermally induced surface morphology changes

2015 ◽  
Vol 159 ◽  
pp. 118-121 ◽  
Author(s):  
Ernandes T. Tenório-Neto ◽  
Marcos R. Guilherme ◽  
Manuel E.G. Winkler ◽  
Lucio Cardozo-Filho ◽  
Stéphani C. Beneti ◽  
...  
Keyword(s):  
Thin Films ◽  
Surface Morphology ◽  
Silver Nanoparticle ◽  
Synthesis And Characterization ◽  
Thermally Induced ◽  
Nanocomposite Thin Films ◽  
Morphology Changes

Synthesis and characterization of Au, Pt supported on graphene aerogel catalysts for CO oxidation at low temperature

2021 ◽  
Vol 11 (1) ◽  
pp. 118-122
Author(s):  
Chuyen Phan Thi ◽  
Hang Tran Thi Thanh ◽  
Phong Pham Nam ◽  
Ha Vu Thi Thu
Keyword(s):  
Low Temperature ◽  
Ambient Temperature ◽  
Co Oxidation ◽  
Pt Nanoparticles ◽  
Molar Ratio ◽  
Synthesis And Characterization ◽  
Graphene Aerogel ◽  
Highly Dispersed ◽  
Average Size

Au, Pt supported on graphene aerogel catalysts (PtAu/rGOA) with molar ratio of Pt and Au of 1:1, and total metal concentration of 5 % were successfully synthesized by hydrothermal method.  The obtained catalysts were characterized by Raman, XRD, XPS, HR-TEM, BET. It revealed that Au and Pt nanoparticles with average size of 3 – 5 nm were highly dispersed on aerogel graphene. The activity of these catalysts was tested  in CO oxidation. The results showed that the conversion of CO at ambient temperature was 100% during 25 minutes. Accordingly, PtAu/rGOA could be considered as a potential catalysts for CO oxidation at low temperature.

Synthesis and characterization of new isostructural series LnFe0.5Sb1.5O6 (Ln = La-Sm) exhibiting high catalytic activity in CO oxidation

2019 ◽  
Vol 777 ◽  
pp. 655-662 ◽  
Author(s):  
A.V. Egorysheva ◽  
O.G. Ellert ◽  
E. Yu Liberman ◽  
D.I. Kirdyankin ◽  
S.V. Golodukhina ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
Synthesis And Characterization ◽  
High Catalytic Activity

One Pot Synthesis and Characterization of Ultra Fine CeO2 and Cu/CeO2 Nanoparticles. Application for Low Temperature CO Oxidation

2011 ◽  
Vol 11 (10) ◽  
pp. 8593-8598 ◽  
Author(s):  
Apostolos Fotopoulos ◽  
Jiannis Arvanitidis ◽  
Dimitris Christofilos ◽  
Konstantinos Papaggelis ◽  
M. Kalyva ◽  
...  
Keyword(s):  
Low Temperature ◽  
Co Oxidation ◽  
Synthesis And Characterization ◽  
One Pot ◽  
One Pot Synthesis ◽  
Low Temperature Co Oxidation

scholarly journals Sodium hypochlorite in the priming of tobacco seeds

2019 ◽  
Vol 41 (1) ◽  
pp. 108-111
Author(s):  
Camila Aparecida Lopes ◽  
Maria Laene Moreira de Carvalho ◽  
Renato Mendes Guimarães ◽  
Ariadne Morbeck Santos de Oliveira ◽  
Dayliane Bernardes de Andrade
Keyword(s):  
Electrical Conductivity ◽  
Sodium Hypochlorite ◽  
Tobacco Industry ◽  
Germination Index ◽  
Commercial Cultivar ◽  
Tobacco Seeds ◽  
Physiological Quality ◽  
Water Contents ◽  
Priming Technique

Abstract: Due to the non-uninform maturation of tobacco fruits and seeds, the priming technique has been used by the tobacco industry as a way of increasing the uniformity and germinations peed of seeds. Several factors can affect priming, including the time and environment in which the treatment is performed. In order to evaluate the effect of sodium hypochlorite as priming agent at different concentrations and the priming period on the physiological quality of the tobacco seeds, it was used a seed lot of commercial cultivar CSC 439 from the Virginia varietal group, widely used by the producing companies. The seeds were subjected to priming in aerated solution at different priming periods (180, 60, 30, 15, and 5 min) and concentrations of sodium hypochlorite (1%, 0.50%, 0.25%, and 0.10 %). The physiological quality was evaluated by the water contents, germination tests, first count, germination index, initial and final stands, emergence index and electrical conductivity. The priming with sodium hypochlorite did not affect germination, but allowed a higher percentage and speed of emergence when using the 1% concentration for 180, 30 and 15 min.

Upconversion luminescence of lanthanide-doped mixed CaMoO4–CaWO4 micro-/nano-materials

2016 ◽  
Vol 45 (30) ◽  
pp. 12094-12102 ◽  
Author(s):  
Jing Liu ◽  
Anna M. Kaczmarek ◽  
Jonas Billet ◽  
Isabel Van Driessche ◽  
Rik Van Deun
Keyword(s):  
Heat Treatment ◽  
Upconversion Luminescence ◽  
Synthesis And Characterization ◽  
Nano Materials ◽  
Red Emission ◽  
Co Doping

The synthesis and characterization of Er3+,Yb3+ doped mixed CaMoO4–CaWO4 micro-/nano-upconversion materials is presented in this paper. The relative intensities of the green and red emission bands can be enhanced by heat treatment or through Gd3+ co-doping.

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