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Mangesh Pandharinath Gharpure - One of the best experts on this subject based on the ideXlab platform.
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Thermal degradation behaviour of some Metal Chelate polymer compounds with bis(bidentate) ligand by TG/DTG/DTA
Journal of Thermal Analysis and Calorimetry, 2013Co-Authors: Ratiram Gomaji Chaudhary, Harjeet D. Juneja, Mangesh Pandharinath GharpureAbstract:Seven novel divalent transitional Metal Chelate polymers compounds (commonly known as Chelate compounds or Metal coordination complexes or polymer complexes) have been characterized by thermogravimetry (TG), differential thermal gravimetry (DTG) and differential thermal analysis (DTA) methods. Thermal decomposition behaviour of Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II) polymers with terphthaoyl-bis( p -methoxyphenylcarbamide) has been investigated by thermogravimetric analysis (TGA) at heating rate 10 °C min^−1 under nitrogen atmosphere. TG/DTA of Chelate compounds were shown to be a stable compound against thermal decomposition which was measured on the basis of final decomposing temperature, but it is observed in some curves that decomposition takes place at low temperature due to the lattice water, which is always placed at outer coordination sphere of the central Metal ion. The presence of both lattice and coordinated water were noteworthy investigated in Co(II), Ni(II) and Cu(II) Chelate polymer compounds, whereas lattice water found in Zn(II), Cd(II) and Hg(II). However, Mn(II) showed only coordinated water. Thermal stabilities for release of lattice water, coordinated water and organic moiety that occur in sequential decomposition of Chelate compounds are explained on the basis of ionic size effect and electronegativity. The processes of thermal degradation taking place in seven Chelate polymers were studied comparatively by TG/DTG/DTA curves which indicating the difference in the thermal decomposition. Coats–Redfern integral method is used to determine the kinetic parameters for the successive steps in the decomposition sequence of TG curves. Scanning electron microscope images of some Chelate polymers were shown in previous publication revealed that particle sizes of Chelate polymers were found to be of nanomaterial level therefore, resulting Chelate compounds might be called as nanomaterial.
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thermal degradation behaviour of some Metal Chelate polymer compounds with bis bidentate ligand by tg dtg dta
Journal of Thermal Analysis and Calorimetry, 2013Co-Authors: Ratiram Gomaji Chaudhary, Harjeet D. Juneja, Mangesh Pandharinath GharpureAbstract:Seven novel divalent transitional Metal Chelate polymers compounds (commonly known as Chelate compounds or Metal coordination complexes or polymer complexes) have been characterized by thermogravimetry (TG), differential thermal gravimetry (DTG) and differential thermal analysis (DTA) methods. Thermal decomposition behaviour of Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II) polymers with terphthaoyl-bis(p-methoxyphenylcarbamide) has been investigated by thermogravimetric analysis (TGA) at heating rate 10 °C min−1 under nitrogen atmosphere. TG/DTA of Chelate compounds were shown to be a stable compound against thermal decomposition which was measured on the basis of final decomposing temperature, but it is observed in some curves that decomposition takes place at low temperature due to the lattice water, which is always placed at outer coordination sphere of the central Metal ion. The presence of both lattice and coordinated water were noteworthy investigated in Co(II), Ni(II) and Cu(II) Chelate polymer compounds, whereas lattice water found in Zn(II), Cd(II) and Hg(II). However, Mn(II) showed only coordinated water. Thermal stabilities for release of lattice water, coordinated water and organic moiety that occur in sequential decomposition of Chelate compounds are explained on the basis of ionic size effect and electronegativity. The processes of thermal degradation taking place in seven Chelate polymers were studied comparatively by TG/DTG/DTA curves which indicating the difference in the thermal decomposition. Coats–Redfern integral method is used to determine the kinetic parameters for the successive steps in the decomposition sequence of TG curves. Scanning electron microscope images of some Chelate polymers were shown in previous publication revealed that particle sizes of Chelate polymers were found to be of nanomaterial level therefore, resulting Chelate compounds might be called as nanomaterial.
Adil Denizli - One of the best experts on this subject based on the ideXlab platform.
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Preconcentration of phosphate ion onto ion-imprinted polymer
Journal of Hazardous Materials, 2008Co-Authors: Ebru Birlik Özkütük, Arzu Ersöz, Adil DenizliAbstract:Abstract In this study, selective separation and preconcentration of phosphate ions on the phosphate-imprinted chitosan-succinate beads have investigated. Chitosan-succinate, phosphate, epichlorohydrin were used as the complexing monomer, template and crosslinking agent, respectively. In the first step, chitosan was modified with succinic anhydrides and complex formation occurred between carboxylic acid functional groups and iron(III) ions. Secondly, Fe(III)-chitosan-succinate particles were reacted with phosphate ions. Afterwards, particles were crosslinked with epichlorohydrin and the template (phosphate ions) was removed using 1 M KOH solution. Selective cavity for the phosphate ion was obtained in the phosphate-imprinted Metal-Chelate polymer. These phosphate-imprinted Metal-Chelate polymer was used in the adsorption–desorption process. The adsorption process was fast and equilibrium was reached around 30 min. The adsorption behaviour of this system was described approximately by the Langmuir equation. Percent extraction, distribution ratio and selectivity coefficients of phosphate and other ions using non-imprinted and phosphate-imprinted polymer were also determined and comparison of these data was reported.
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L-histidine imprinted synthetic receptor for biochromatography applications.
Analytical chemistry, 2006Co-Authors: Ayça Atılır Özcan, Adil Denizli, Rıdvan Say, Arzu ErsözAbstract:We have proposed novel surface-imprinted beads for selective separation of cytochrome c (cyt c) by N-methacryloyl-(l)-histidine−copper(II) [MAH−Cu(II)] as a new Metal-chelating monomer via Metal coordination interactions and histidine template. We have combined molecular imprinting with the ability of histidine to Chelate Metal ions to create ligand exchange beads suitable for the binding of cyt c (surface histidine exposed protein). The histidine imprinted beads were produced by suspension polymerization of MAH−Cu(II)−l-histidine and ethylene glycol dimethacrylate. After polymerization, the template (l-histidine) was removed from the beads using methanolic KOH, thus getting histidine imprinted Metal−Chelate beads. l-Histidine imprinted Metal−Chelate beads can be used several times without considerable loss of cyt c adsorption capacity. The association constant (Ka) for the specific interaction between the template imprinted polymer and the template (l-histidine) itself were determined by Scatchard plots ...
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reversible immobilization of catalase by Metal Chelate affinity interaction on magnetic beads
Industrial & Engineering Chemistry Research, 2006Co-Authors: Mufrettin Murat Sari, Sinan Akgol, Melike Karatas, Adil DenizliAbstract:A magnetic Metal−Chelate adsorbent utilizing N-methacryloyl-(l)-cysteine methyl ester (MAC) as a Metal-chelating ligand was prepared. MAC was synthesized using methacryloyl chloride and l-cysteine ...
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reversible immobilization of catalase by Metal Chelate affinity interaction on magnetic beads
Industrial & Engineering Chemistry Research, 2006Co-Authors: Mufrettin Murat Sari, Sinan Akgol, Melike Karatas, Adil DenizliAbstract:A magnetic Metal−Chelate adsorbent utilizing N-methacryloyl-(l)-cysteine methyl ester (MAC) as a Metal-chelating ligand was prepared. MAC was synthesized using methacryloyl chloride and l-cysteine methyl ester dihydrochloride. Magnetic beads with an average size of 150−250 μm were obtained by suspension polymerization of 2-hydroxyethyl methacrylate (HEMA) and MAC carried out in a dispersion medium. Mag-poly(HEMA−MAC) beads were characterized by surface area measurements, swelling tests, electron spin resonance (ESR) spectroscopy, elemental analysis, and scanning electron microscopy (SEM). The specific surface area of the magnetic beads was found to be 92.6 m2/g. Elemental analysis of MAC for nitrogen was estimated as 55.4 μmol/g. Then, Fe3+ ions were Chelated on the magnetic beads. The Fe3+ loading was 12.7 μmol/g of support. Fe3+-Chelated magnetic beads with a swelling ratio of 62% were used in the immobilization of catalase in a batch system. This approach to the preparation of enzyme carrier has severa...
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novel Metal Chelate affinity sorbents for reversible use in catalase adsorption
Journal of Molecular Catalysis B-enzymatic, 2004Co-Authors: Sinan Akgol, Adil DenizliAbstract:Abstract A novel Metal-Chelate adsorbent utilizing N -methacryloyl-( l )-histidine methyl ester (MAH) as a Metal-chelating ligand was prepared. MAH was synthesized by using methacryloyl chloride and l -histidine methyl ester dihydrochloride. Magnetic beads with an average size of 150–250 μm were obtained by suspension polymerization of ethylene glycol dimethacrylate (EGDMA), and MAH conducted in aqueous dispersion medium. The specific surface area of the porous beads was found to be 80.1 m 2 /g. Mag-poly(EGDMA–MAH) beads were characterized by swelling tests, electron spin resonance (ESR), nuclear magnetic resonance (NMR) and scanning electron microscopy (SEM). Elemental analysis of MAH for nitrogen was estimated as 43.9 μmol/g. Then, Fe 3+ ions were Chelated on the magnetic beads. Fe 3+ -Chelated magnetic beads with a swelling ratio of 40% were used in the adsorption of catalase in batch system. The maximum catalase adsorption capacity of the mag-poly(EGDMA–MAH)–Fe 3+ beads was observed as 83.2 mg/g at pH 7.0. The K m values for immobilized catalase (mag-poly(EGDMA–MAH)–Fe 3+ ) (20.5 mM) were higher than that of free enzyme (16.5 mM). Storage stability was found to increase with immobilization. It was observed that enzyme could be repeatedly adsorbed and desorbed without significant loss in adsorption capacity or enzyme activity.
Ratiram Gomaji Chaudhary - One of the best experts on this subject based on the ideXlab platform.
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Thermal degradation behaviour of some Metal Chelate polymer compounds with bis(bidentate) ligand by TG/DTG/DTA
Journal of Thermal Analysis and Calorimetry, 2013Co-Authors: Ratiram Gomaji Chaudhary, Harjeet D. Juneja, Mangesh Pandharinath GharpureAbstract:Seven novel divalent transitional Metal Chelate polymers compounds (commonly known as Chelate compounds or Metal coordination complexes or polymer complexes) have been characterized by thermogravimetry (TG), differential thermal gravimetry (DTG) and differential thermal analysis (DTA) methods. Thermal decomposition behaviour of Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II) polymers with terphthaoyl-bis( p -methoxyphenylcarbamide) has been investigated by thermogravimetric analysis (TGA) at heating rate 10 °C min^−1 under nitrogen atmosphere. TG/DTA of Chelate compounds were shown to be a stable compound against thermal decomposition which was measured on the basis of final decomposing temperature, but it is observed in some curves that decomposition takes place at low temperature due to the lattice water, which is always placed at outer coordination sphere of the central Metal ion. The presence of both lattice and coordinated water were noteworthy investigated in Co(II), Ni(II) and Cu(II) Chelate polymer compounds, whereas lattice water found in Zn(II), Cd(II) and Hg(II). However, Mn(II) showed only coordinated water. Thermal stabilities for release of lattice water, coordinated water and organic moiety that occur in sequential decomposition of Chelate compounds are explained on the basis of ionic size effect and electronegativity. The processes of thermal degradation taking place in seven Chelate polymers were studied comparatively by TG/DTG/DTA curves which indicating the difference in the thermal decomposition. Coats–Redfern integral method is used to determine the kinetic parameters for the successive steps in the decomposition sequence of TG curves. Scanning electron microscope images of some Chelate polymers were shown in previous publication revealed that particle sizes of Chelate polymers were found to be of nanomaterial level therefore, resulting Chelate compounds might be called as nanomaterial.
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thermal degradation behaviour of some Metal Chelate polymer compounds with bis bidentate ligand by tg dtg dta
Journal of Thermal Analysis and Calorimetry, 2013Co-Authors: Ratiram Gomaji Chaudhary, Harjeet D. Juneja, Mangesh Pandharinath GharpureAbstract:Seven novel divalent transitional Metal Chelate polymers compounds (commonly known as Chelate compounds or Metal coordination complexes or polymer complexes) have been characterized by thermogravimetry (TG), differential thermal gravimetry (DTG) and differential thermal analysis (DTA) methods. Thermal decomposition behaviour of Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II) polymers with terphthaoyl-bis(p-methoxyphenylcarbamide) has been investigated by thermogravimetric analysis (TGA) at heating rate 10 °C min−1 under nitrogen atmosphere. TG/DTA of Chelate compounds were shown to be a stable compound against thermal decomposition which was measured on the basis of final decomposing temperature, but it is observed in some curves that decomposition takes place at low temperature due to the lattice water, which is always placed at outer coordination sphere of the central Metal ion. The presence of both lattice and coordinated water were noteworthy investigated in Co(II), Ni(II) and Cu(II) Chelate polymer compounds, whereas lattice water found in Zn(II), Cd(II) and Hg(II). However, Mn(II) showed only coordinated water. Thermal stabilities for release of lattice water, coordinated water and organic moiety that occur in sequential decomposition of Chelate compounds are explained on the basis of ionic size effect and electronegativity. The processes of thermal degradation taking place in seven Chelate polymers were studied comparatively by TG/DTG/DTA curves which indicating the difference in the thermal decomposition. Coats–Redfern integral method is used to determine the kinetic parameters for the successive steps in the decomposition sequence of TG curves. Scanning electron microscope images of some Chelate polymers were shown in previous publication revealed that particle sizes of Chelate polymers were found to be of nanomaterial level therefore, resulting Chelate compounds might be called as nanomaterial.
Harjeet D. Juneja - One of the best experts on this subject based on the ideXlab platform.
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Thermal degradation behaviour of some Metal Chelate polymer compounds with bis(bidentate) ligand by TG/DTG/DTA
Journal of Thermal Analysis and Calorimetry, 2013Co-Authors: Ratiram Gomaji Chaudhary, Harjeet D. Juneja, Mangesh Pandharinath GharpureAbstract:Seven novel divalent transitional Metal Chelate polymers compounds (commonly known as Chelate compounds or Metal coordination complexes or polymer complexes) have been characterized by thermogravimetry (TG), differential thermal gravimetry (DTG) and differential thermal analysis (DTA) methods. Thermal decomposition behaviour of Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II) polymers with terphthaoyl-bis( p -methoxyphenylcarbamide) has been investigated by thermogravimetric analysis (TGA) at heating rate 10 °C min^−1 under nitrogen atmosphere. TG/DTA of Chelate compounds were shown to be a stable compound against thermal decomposition which was measured on the basis of final decomposing temperature, but it is observed in some curves that decomposition takes place at low temperature due to the lattice water, which is always placed at outer coordination sphere of the central Metal ion. The presence of both lattice and coordinated water were noteworthy investigated in Co(II), Ni(II) and Cu(II) Chelate polymer compounds, whereas lattice water found in Zn(II), Cd(II) and Hg(II). However, Mn(II) showed only coordinated water. Thermal stabilities for release of lattice water, coordinated water and organic moiety that occur in sequential decomposition of Chelate compounds are explained on the basis of ionic size effect and electronegativity. The processes of thermal degradation taking place in seven Chelate polymers were studied comparatively by TG/DTG/DTA curves which indicating the difference in the thermal decomposition. Coats–Redfern integral method is used to determine the kinetic parameters for the successive steps in the decomposition sequence of TG curves. Scanning electron microscope images of some Chelate polymers were shown in previous publication revealed that particle sizes of Chelate polymers were found to be of nanomaterial level therefore, resulting Chelate compounds might be called as nanomaterial.
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thermal degradation behaviour of some Metal Chelate polymer compounds with bis bidentate ligand by tg dtg dta
Journal of Thermal Analysis and Calorimetry, 2013Co-Authors: Ratiram Gomaji Chaudhary, Harjeet D. Juneja, Mangesh Pandharinath GharpureAbstract:Seven novel divalent transitional Metal Chelate polymers compounds (commonly known as Chelate compounds or Metal coordination complexes or polymer complexes) have been characterized by thermogravimetry (TG), differential thermal gravimetry (DTG) and differential thermal analysis (DTA) methods. Thermal decomposition behaviour of Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II) polymers with terphthaoyl-bis(p-methoxyphenylcarbamide) has been investigated by thermogravimetric analysis (TGA) at heating rate 10 °C min−1 under nitrogen atmosphere. TG/DTA of Chelate compounds were shown to be a stable compound against thermal decomposition which was measured on the basis of final decomposing temperature, but it is observed in some curves that decomposition takes place at low temperature due to the lattice water, which is always placed at outer coordination sphere of the central Metal ion. The presence of both lattice and coordinated water were noteworthy investigated in Co(II), Ni(II) and Cu(II) Chelate polymer compounds, whereas lattice water found in Zn(II), Cd(II) and Hg(II). However, Mn(II) showed only coordinated water. Thermal stabilities for release of lattice water, coordinated water and organic moiety that occur in sequential decomposition of Chelate compounds are explained on the basis of ionic size effect and electronegativity. The processes of thermal degradation taking place in seven Chelate polymers were studied comparatively by TG/DTG/DTA curves which indicating the difference in the thermal decomposition. Coats–Redfern integral method is used to determine the kinetic parameters for the successive steps in the decomposition sequence of TG curves. Scanning electron microscope images of some Chelate polymers were shown in previous publication revealed that particle sizes of Chelate polymers were found to be of nanomaterial level therefore, resulting Chelate compounds might be called as nanomaterial.
Deyi Wang - One of the best experts on this subject based on the ideXlab platform.
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effect of Metal Chelates on the ignition and early flaming behaviour of intumescent fire retarded polyethylene systems
Polymer Degradation and Stability, 2008Co-Authors: Deyi Wang, Yun Liu, Yuzhong Wang, Anna A Stec, Bhaskar Biswas, Richard T Hull, D PriceAbstract:Abstract Polyethylene (PE) was treated with various formulations containing an intumescent fire retardant, which consists of melamine phosphate (MP), pentaerythritol (PER) and ammonium polyphosphate (APP), and one or none of following Metal Chelates: CuSAO, CoSAO and NiSAO. The behaviour of this intumescent system can be enhanced significantly by the addition of small amounts (0.2%) of Metal Chelate (CuSAO, CoSAO and NiSAO). The thermal stabilization, burning behaviour and char formation of the fire retardant PE system have been investigated by TGA, LOI, UL-94 test, SEM and cone calorimetry. All formulations studied provide good fire retardant behaviour, with LOI ≥ 27.4 and UL-94 V-0 rating. TGA results present more complicated thermal decomposition behaviour after the addition of small amounts (0.2%) of Metal Chelate when compared to that of PE-IFR. Cone calorimetry of PE-IFR–Metal Chelate (PE-IFR–CuSAO, PE-IFR–CoSAO and PE-IFR–NiSAO) shows a very significant decrease in HRR, PHRR, ML, THR and a very significant improvement of TTI compared to samples without Metal Chelate. Furthermore, SEM and photographs of the char layer show that the char layer from PE-IFR–Metal Chelate has a compact and tough char structure compared to the open porous char layer produced by sample without Metal Chelate.