Megha B Wasu - Academia.edu (original) (raw)

Papers by Megha B Wasu

international journal of chemical sciences, 2015

Conductive polymers are highly nanostructured materials formed by organic building blocks. The pr... more Conductive polymers are highly nanostructured materials formed by organic building blocks. The presence of delocalized molecular orbitals in these polymers makes them conductive. Present work deals with the study of polyaniline based conductive polymers synthesized by bulk oxidative chemical polymerization using ammonium per sulfate as an oxidant. The conductive polymeric materials were investigated by thermo gravimetric analysis (TGA), UV-visible studies confirmed the structure of synthesized polymers. TGA studies shows that polymeric materials are thermally stable upto about 150oC, above this temperature degradation of polymeric material starts. Slight structural and morphological changes are observed in TEM images with change in substituent in monomer units.

The chemical polymerization of aniline was carried out by ammonium per sulphate as an oxidant. Po... more The chemical polymerization of aniline was
carried out by ammonium per sulphate as an
oxidant. Polyaniline nanoparticles were prepared
in aqueous medium by chemical oxidation using
emulsification diffusion method. The particle size
varied with the ratio of ammonium per
sulphate/PANI. The particle size determined by
scanning electron microscope was 50-60 nm. The
colloidal emulsion of green color has colloidal
stability and exists as stable emulsion without
any precipitation. The conductivity and
percentage yield get affected by
oxidant/monomer ratio.

The interaction of uranyl (IV) ion with benzoic acid have been investigated pHmetrically in diffe... more The interaction of uranyl (IV) ion with benzoic acid have been investigated pHmetrically in
different dielectric environment of 10%, 20%, 30%, 40% and 50%, dioxane- water mixtures. Bjerrum’s
potentiometric titration as adopted by Calvin and Wilson have been used to determine The interaction of uranyl (IV) ion with benzoic acid have been investigated pHmetrically in
different dielectric environment of 10%, 20%, 30%, 40% and 50%, dioxane- water mixtures. Bjerrum’s
potentiometric titration as adopted by Calvin and Wilson have been used to determine proton –ligand and
metal-ligand stability constant using Irving-Rossoti’s expression. The variation in values of n, nA, log K1
and log K2 at different percentage compositions of dioxane-water shows favourable effect on complexation
equilibria

Sampling-for Chemical analysis, the water samples are collected from different regions, at depth ... more Sampling-for Chemical analysis, the water samples are collected from different regions, at depth of
0.5 meter in case of open water bodies and in case of piped water supply system from the tap in the
thoroughly cleaned jar or natural gas container of minimum 2.5 lit of capacity provided with double cap
device. The samples are collected up to top without living any space so as to prevent the premature release
of dissolved gases during the transit period.

Poly m-toludine/Nd composite material can be synthesized by insitu polymerization using m-toludin... more Poly m-toludine/Nd composite material can be synthesized by insitu polymerization using m-toludine and neodymium chloride reactants. During the chemical oxidative polymerization m-toludine gets oxidized to poly m-toludine, neodymium chloride get reduced and produce metal- polymer composite. This composite is characterized by UV-Visible spectroscopy, FT-IR spectroscopy. The spectral study provides the information about the structure of metal-polymer composite. The XRD and SEM, TEM analysis shows the size of composite particles and morphology of the polymer respectively. Thermal stability of composite is studied by Thermogravimetric analysis. The increase in electrical conductivity due to metal dopant is confirmed by the Four probe conductivity method.

Present work deals with the synthesis of Polyaniline, polynitro aniline, poly m-toludine and poly... more Present work deals with the synthesis of Polyaniline, polynitro
aniline, poly m-toludine and poly o-toludine polymers by
chemical oxidation method using ammonium per sulfate as
chemical oxidant. The yield of all polymers was higher than
90%.The synthesized polymeric material have been characterized
by FTIR spectroscopy. FTIR and SEM studies of polymer show
the structural and slight morphological changes with change in
substituent in monomer units.

Present work deals with the synthesis of Polyaniline, polynitro aniline, poly m-toludine and poly... more Present work deals with the synthesis of Polyaniline, polynitro
aniline, poly m-toludine and poly o-toludine polymers by
chemical oxidation method using ammonium per sulfate as
chemical oxidant. The yield of all polymers was higher than
90%.The synthesized polymeric material have been characterized
by FTIR spectroscopy. FTIR and SEM studies of polymer show
the structural and slight morphological changes with change in
substituent in monomer units

Abstract: Poly o-toludine- Lanthanide metal composites can be synthesized by insitu polymerizatio... more Abstract: Poly o-toludine- Lanthanide metal composites can be synthesized by insitu polymerization of o-toludine monomer using ammonium persulphate as chemical oxidant. During the composite formation process o-toludine get oxidized to poly-o-toludine and reduction of metal salt takes place. The metal composites were characterized by FTIR, UV-visible spectroscopy, it provide the information about the structure of the metal –polymer composite. The XRD analysis show the size of nano particles where as the morphology of composite were studied by SEM & TEM analysis. Thermal properties of polymer composites were studied using thermo gravimetric analysis. The four probe conductivity measurements revealed the increase in conductivity of doped poly o-toludine polymers with lanthanide metals.

Present work deals with the synthesis of Polyaniline, polynitro aniline, poly m-toludine and poly... more Present work deals with the synthesis of Polyaniline, polynitro aniline, poly m-toludine and poly o-toludine polymers by chemical oxidation method using ammonium per sulfate as chemical oxidant. The yield of all polymers was higher than 90%.The synthesized polymeric material have been characterized by FTIR spectroscopy. FTIR and SEM studies of polymer show the structural and slight morphological changes with change in substituent in monomer units.

international journal of chemical sciences, 2015

Conductive polymers are highly nanostructured materials formed by organic building blocks. The pr... more Conductive polymers are highly nanostructured materials formed by organic building blocks. The presence of delocalized molecular orbitals in these polymers makes them conductive. Present work deals with the study of polyaniline based conductive polymers synthesized by bulk oxidative chemical polymerization using ammonium per sulfate as an oxidant. The conductive polymeric materials were investigated by thermo gravimetric analysis (TGA), UV-visible studies confirmed the structure of synthesized polymers. TGA studies shows that polymeric materials are thermally stable upto about 150oC, above this temperature degradation of polymeric material starts. Slight structural and morphological changes are observed in TEM images with change in substituent in monomer units.

The chemical polymerization of aniline was carried out by ammonium per sulphate as an oxidant. Po... more The chemical polymerization of aniline was
carried out by ammonium per sulphate as an
oxidant. Polyaniline nanoparticles were prepared
in aqueous medium by chemical oxidation using
emulsification diffusion method. The particle size
varied with the ratio of ammonium per
sulphate/PANI. The particle size determined by
scanning electron microscope was 50-60 nm. The
colloidal emulsion of green color has colloidal
stability and exists as stable emulsion without
any precipitation. The conductivity and
percentage yield get affected by
oxidant/monomer ratio.

The interaction of uranyl (IV) ion with benzoic acid have been investigated pHmetrically in diffe... more The interaction of uranyl (IV) ion with benzoic acid have been investigated pHmetrically in
different dielectric environment of 10%, 20%, 30%, 40% and 50%, dioxane- water mixtures. Bjerrum’s
potentiometric titration as adopted by Calvin and Wilson have been used to determine The interaction of uranyl (IV) ion with benzoic acid have been investigated pHmetrically in
different dielectric environment of 10%, 20%, 30%, 40% and 50%, dioxane- water mixtures. Bjerrum’s
potentiometric titration as adopted by Calvin and Wilson have been used to determine proton –ligand and
metal-ligand stability constant using Irving-Rossoti’s expression. The variation in values of n, nA, log K1
and log K2 at different percentage compositions of dioxane-water shows favourable effect on complexation
equilibria

Sampling-for Chemical analysis, the water samples are collected from different regions, at depth ... more Sampling-for Chemical analysis, the water samples are collected from different regions, at depth of
0.5 meter in case of open water bodies and in case of piped water supply system from the tap in the
thoroughly cleaned jar or natural gas container of minimum 2.5 lit of capacity provided with double cap
device. The samples are collected up to top without living any space so as to prevent the premature release
of dissolved gases during the transit period.

Poly m-toludine/Nd composite material can be synthesized by insitu polymerization using m-toludin... more Poly m-toludine/Nd composite material can be synthesized by insitu polymerization using m-toludine and neodymium chloride reactants. During the chemical oxidative polymerization m-toludine gets oxidized to poly m-toludine, neodymium chloride get reduced and produce metal- polymer composite. This composite is characterized by UV-Visible spectroscopy, FT-IR spectroscopy. The spectral study provides the information about the structure of metal-polymer composite. The XRD and SEM, TEM analysis shows the size of composite particles and morphology of the polymer respectively. Thermal stability of composite is studied by Thermogravimetric analysis. The increase in electrical conductivity due to metal dopant is confirmed by the Four probe conductivity method.

Present work deals with the synthesis of Polyaniline, polynitro aniline, poly m-toludine and poly... more Present work deals with the synthesis of Polyaniline, polynitro
aniline, poly m-toludine and poly o-toludine polymers by
chemical oxidation method using ammonium per sulfate as
chemical oxidant. The yield of all polymers was higher than
90%.The synthesized polymeric material have been characterized
by FTIR spectroscopy. FTIR and SEM studies of polymer show
the structural and slight morphological changes with change in
substituent in monomer units.

Present work deals with the synthesis of Polyaniline, polynitro aniline, poly m-toludine and poly... more Present work deals with the synthesis of Polyaniline, polynitro
aniline, poly m-toludine and poly o-toludine polymers by
chemical oxidation method using ammonium per sulfate as
chemical oxidant. The yield of all polymers was higher than
90%.The synthesized polymeric material have been characterized
by FTIR spectroscopy. FTIR and SEM studies of polymer show
the structural and slight morphological changes with change in
substituent in monomer units

Abstract: Poly o-toludine- Lanthanide metal composites can be synthesized by insitu polymerizatio... more Abstract: Poly o-toludine- Lanthanide metal composites can be synthesized by insitu polymerization of o-toludine monomer using ammonium persulphate as chemical oxidant. During the composite formation process o-toludine get oxidized to poly-o-toludine and reduction of metal salt takes place. The metal composites were characterized by FTIR, UV-visible spectroscopy, it provide the information about the structure of the metal –polymer composite. The XRD analysis show the size of nano particles where as the morphology of composite were studied by SEM & TEM analysis. Thermal properties of polymer composites were studied using thermo gravimetric analysis. The four probe conductivity measurements revealed the increase in conductivity of doped poly o-toludine polymers with lanthanide metals.

Present work deals with the synthesis of Polyaniline, polynitro aniline, poly m-toludine and poly... more Present work deals with the synthesis of Polyaniline, polynitro aniline, poly m-toludine and poly o-toludine polymers by chemical oxidation method using ammonium per sulfate as chemical oxidant. The yield of all polymers was higher than 90%.The synthesized polymeric material have been characterized by FTIR spectroscopy. FTIR and SEM studies of polymer show the structural and slight morphological changes with change in substituent in monomer units.