The Experts below are selected from a list of 165 Experts worldwide ranked by ideXlab platform

M. Noel - One of the best experts on this subject based on the ideXlab platform.

  • Ferric-oxalate-gluconate based redox mediated electrochemical system for Vat Dyeing
    Journal of Applied Electrochemistry, 2009
    Co-Authors: K. Firoz Babu, M. Anbu Kulandainathan, R. Senthil Kumar, M. Noel
    Abstract:

    The voltammetric behaviour of the ferric-oxalate-gluconate system is investigated along with some electrochemical Dyeing results. The results are compared with the conventional ferric-triethanolamine-gluconate system on a glassy carbon electrode. The ferric-triethanolamine redox system is stable and exhibits quasi-reversible redox behaviour in alkaline medium. The ferric-oxalate system undergoes hydrolysis and precipitates above pH 8. Vat Dyeing requires the stability of the redox system in alkaline solutions. The ferric-oxalate redox system alone cannot satisfy this requirement. However, in the presence of excess gluconate, both systems exhibit stability in alkaline media. Mechanistic studies indicate the formation of ferrous-gluconate as the reducing agent for Vat Dyeing from these mediator systems. Electrochemical Dyeing was also carried out in the mediator system under investigation. Colour depth was characterized by the Kubelka-Munk value (K/S) and CIE Lab-coordinates for the dyed fabrics and was found to be comparable with samples dyed using sodium dithionite as the reducing agent.

  • Redox mediated electrochemical method for Vat Dyeing in ferric-oxalate-gluconate system: process optimization studies
    Journal of Applied Electrochemistry, 2009
    Co-Authors: R. Senthil Kumar, K. Firoz Babu, M. Noel, M. Anbu Kulandainathan
    Abstract:

    Preliminary efforts were made to identify alternative ligands for relatively greener and cheaper than triethanolamine (TEA), leading to a new ferric-oxalate-gluconate mixed ligand system as a potential alternative. Cyclic voltammetry was employed to study the mechanism involved. A low concentration of electrogenerated Fe^II-oxalate is transformed into Fe^II-gluconate, which is the reducing agent in the overall process. The influences of electrolyte medium, electrode material, nature of dye, dye concentration, material to liquor ratio (MLR), and other related parameters were studied to arrive at optimum experimental condition. Copper cathode and stainless steel anode were the material of choice. The optimum cathode current density was found to be 2.30 mA cm^−2. Under optimum condition, both cotton fabric and yarn could be efficiently dyed using this electrochemical process. The electrolyte could also be recycled. Color intensity for different dyed materials was evaluated using K/S values according to the Kubelka–Munk equation.

  • preparation of iron deposited graphite surface for application as cathode material during electrochemical Vat Dyeing process
    Materials Chemistry and Physics, 2008
    Co-Authors: Anbu M Kulandainathan, Azhaguchamy Muthukumaran, K. Kiruthika, G. Christopher, Firoz K Babu, M. Noel
    Abstract:

    Abstract Iron-deposited graphite surfaces were prepared, characterized and employed as cathode materials for electrochemical Vat-Dyeing process containing very low concentration of sodium dithionite. The electrodeposition, in presence of ammonium thiocyanate and gelatin or animal glue as binding additives, were found to give finer iron deposits for improved electrochemical Dyeing application. The electrodeposits were characterized using scanning electron microscopy, electron-dispersive X-ray spectroscopy and X-ray diffraction methods, before and after electrochemical Dyeing process. The electrochemical activity of the iron-deposited graphite electrodes always stored in water seems to depend on the surface-bound Fe 3+ /Fe 2+ redox species. Vat dyes like C.I. Vat Violet 1, C.I. Vat Green 1 and C.I. Vat Blue 4 could be efficiently dyed employing these above electrode materials. The colour intensity and washing fastness of the dyed fabrics were found to be equal with conventionally dyed fabrics. The electrodes could also be reused for the Dyeing process.

M. Anbu Kulandainathan - One of the best experts on this subject based on the ideXlab platform.

  • Ferric-oxalate-gluconate based redox mediated electrochemical system for Vat Dyeing
    Journal of Applied Electrochemistry, 2009
    Co-Authors: K. Firoz Babu, M. Anbu Kulandainathan, R. Senthil Kumar, M. Noel
    Abstract:

    The voltammetric behaviour of the ferric-oxalate-gluconate system is investigated along with some electrochemical Dyeing results. The results are compared with the conventional ferric-triethanolamine-gluconate system on a glassy carbon electrode. The ferric-triethanolamine redox system is stable and exhibits quasi-reversible redox behaviour in alkaline medium. The ferric-oxalate system undergoes hydrolysis and precipitates above pH 8. Vat Dyeing requires the stability of the redox system in alkaline solutions. The ferric-oxalate redox system alone cannot satisfy this requirement. However, in the presence of excess gluconate, both systems exhibit stability in alkaline media. Mechanistic studies indicate the formation of ferrous-gluconate as the reducing agent for Vat Dyeing from these mediator systems. Electrochemical Dyeing was also carried out in the mediator system under investigation. Colour depth was characterized by the Kubelka-Munk value (K/S) and CIE Lab-coordinates for the dyed fabrics and was found to be comparable with samples dyed using sodium dithionite as the reducing agent.

  • Redox mediated electrochemical method for Vat Dyeing in ferric-oxalate-gluconate system: process optimization studies
    Journal of Applied Electrochemistry, 2009
    Co-Authors: R. Senthil Kumar, K. Firoz Babu, M. Noel, M. Anbu Kulandainathan
    Abstract:

    Preliminary efforts were made to identify alternative ligands for relatively greener and cheaper than triethanolamine (TEA), leading to a new ferric-oxalate-gluconate mixed ligand system as a potential alternative. Cyclic voltammetry was employed to study the mechanism involved. A low concentration of electrogenerated Fe^II-oxalate is transformed into Fe^II-gluconate, which is the reducing agent in the overall process. The influences of electrolyte medium, electrode material, nature of dye, dye concentration, material to liquor ratio (MLR), and other related parameters were studied to arrive at optimum experimental condition. Copper cathode and stainless steel anode were the material of choice. The optimum cathode current density was found to be 2.30 mA cm^−2. Under optimum condition, both cotton fabric and yarn could be efficiently dyed using this electrochemical process. The electrolyte could also be recycled. Color intensity for different dyed materials was evaluated using K/S values according to the Kubelka–Munk equation.

  • Preparation of iron-deposited graphite surface for application as cathode material during electrochemical Vat-Dyeing process
    Materials Chemistry and Physics, 2008
    Co-Authors: M. Anbu Kulandainathan, Azhaguchamy Muthukumaran, K. Kiruthika, K. Firoz Babu, G. Christopher, Midoux Noël
    Abstract:

    Iron-deposited graphite surfaces were prepared, characterized and employed as cathode materials for electrochemical Vat-Dyeing process containing very low concentration of sodium dithionite. The electrodeposition, in presence of ammonium thiocyanate and gelatin or animal glue as binding additives, were found to give finer iron deposits for improved electrochemical Dyeing application. The electrodeposits were characterized using scanning electron microscopy, electron-dispersive X-ray spectroscopy and X-ray diffraction methods, before and after electrochemical Dyeing process. The electrochemical activity of the iron-deposited graphite electrodes always stored in water seems to depend on the surface-bound Fe3+/Fe2+ redox species. Vat dyes like C.I. Vat Violet 1, C.I. Vat Green 1 and C.I. Vat Blue 4 could be efficiently dyed employing these above electrode materials. The colour intensity and washing fastness of the dyed fabrics were found to be equal with conventionally dyed fabrics. The electrodes could also be reused for the Dyeing process. ?? 2008 Elsevier B.V. All rights reserved.

K. Firoz Babu - One of the best experts on this subject based on the ideXlab platform.

  • Ferric-oxalate-gluconate based redox mediated electrochemical system for Vat Dyeing
    Journal of Applied Electrochemistry, 2009
    Co-Authors: K. Firoz Babu, M. Anbu Kulandainathan, R. Senthil Kumar, M. Noel
    Abstract:

    The voltammetric behaviour of the ferric-oxalate-gluconate system is investigated along with some electrochemical Dyeing results. The results are compared with the conventional ferric-triethanolamine-gluconate system on a glassy carbon electrode. The ferric-triethanolamine redox system is stable and exhibits quasi-reversible redox behaviour in alkaline medium. The ferric-oxalate system undergoes hydrolysis and precipitates above pH 8. Vat Dyeing requires the stability of the redox system in alkaline solutions. The ferric-oxalate redox system alone cannot satisfy this requirement. However, in the presence of excess gluconate, both systems exhibit stability in alkaline media. Mechanistic studies indicate the formation of ferrous-gluconate as the reducing agent for Vat Dyeing from these mediator systems. Electrochemical Dyeing was also carried out in the mediator system under investigation. Colour depth was characterized by the Kubelka-Munk value (K/S) and CIE Lab-coordinates for the dyed fabrics and was found to be comparable with samples dyed using sodium dithionite as the reducing agent.

  • Redox mediated electrochemical method for Vat Dyeing in ferric-oxalate-gluconate system: process optimization studies
    Journal of Applied Electrochemistry, 2009
    Co-Authors: R. Senthil Kumar, K. Firoz Babu, M. Noel, M. Anbu Kulandainathan
    Abstract:

    Preliminary efforts were made to identify alternative ligands for relatively greener and cheaper than triethanolamine (TEA), leading to a new ferric-oxalate-gluconate mixed ligand system as a potential alternative. Cyclic voltammetry was employed to study the mechanism involved. A low concentration of electrogenerated Fe^II-oxalate is transformed into Fe^II-gluconate, which is the reducing agent in the overall process. The influences of electrolyte medium, electrode material, nature of dye, dye concentration, material to liquor ratio (MLR), and other related parameters were studied to arrive at optimum experimental condition. Copper cathode and stainless steel anode were the material of choice. The optimum cathode current density was found to be 2.30 mA cm^−2. Under optimum condition, both cotton fabric and yarn could be efficiently dyed using this electrochemical process. The electrolyte could also be recycled. Color intensity for different dyed materials was evaluated using K/S values according to the Kubelka–Munk equation.

R. Senthil Kumar - One of the best experts on this subject based on the ideXlab platform.

  • Ferric-oxalate-gluconate based redox mediated electrochemical system for Vat Dyeing
    Journal of Applied Electrochemistry, 2009
    Co-Authors: K. Firoz Babu, M. Anbu Kulandainathan, R. Senthil Kumar, M. Noel
    Abstract:

    The voltammetric behaviour of the ferric-oxalate-gluconate system is investigated along with some electrochemical Dyeing results. The results are compared with the conventional ferric-triethanolamine-gluconate system on a glassy carbon electrode. The ferric-triethanolamine redox system is stable and exhibits quasi-reversible redox behaviour in alkaline medium. The ferric-oxalate system undergoes hydrolysis and precipitates above pH 8. Vat Dyeing requires the stability of the redox system in alkaline solutions. The ferric-oxalate redox system alone cannot satisfy this requirement. However, in the presence of excess gluconate, both systems exhibit stability in alkaline media. Mechanistic studies indicate the formation of ferrous-gluconate as the reducing agent for Vat Dyeing from these mediator systems. Electrochemical Dyeing was also carried out in the mediator system under investigation. Colour depth was characterized by the Kubelka-Munk value (K/S) and CIE Lab-coordinates for the dyed fabrics and was found to be comparable with samples dyed using sodium dithionite as the reducing agent.

  • Redox mediated electrochemical method for Vat Dyeing in ferric-oxalate-gluconate system: process optimization studies
    Journal of Applied Electrochemistry, 2009
    Co-Authors: R. Senthil Kumar, K. Firoz Babu, M. Noel, M. Anbu Kulandainathan
    Abstract:

    Preliminary efforts were made to identify alternative ligands for relatively greener and cheaper than triethanolamine (TEA), leading to a new ferric-oxalate-gluconate mixed ligand system as a potential alternative. Cyclic voltammetry was employed to study the mechanism involved. A low concentration of electrogenerated Fe^II-oxalate is transformed into Fe^II-gluconate, which is the reducing agent in the overall process. The influences of electrolyte medium, electrode material, nature of dye, dye concentration, material to liquor ratio (MLR), and other related parameters were studied to arrive at optimum experimental condition. Copper cathode and stainless steel anode were the material of choice. The optimum cathode current density was found to be 2.30 mA cm^−2. Under optimum condition, both cotton fabric and yarn could be efficiently dyed using this electrochemical process. The electrolyte could also be recycled. Color intensity for different dyed materials was evaluated using K/S values according to the Kubelka–Munk equation.

Midoux Noël - One of the best experts on this subject based on the ideXlab platform.

  • Preparation of iron-deposited graphite surface for application as cathode material during electrochemical Vat-Dyeing process
    Materials Chemistry and Physics, 2008
    Co-Authors: M. Anbu Kulandainathan, Azhaguchamy Muthukumaran, K. Kiruthika, K. Firoz Babu, G. Christopher, Midoux Noël
    Abstract:

    Iron-deposited graphite surfaces were prepared, characterized and employed as cathode materials for electrochemical Vat-Dyeing process containing very low concentration of sodium dithionite. The electrodeposition, in presence of ammonium thiocyanate and gelatin or animal glue as binding additives, were found to give finer iron deposits for improved electrochemical Dyeing application. The electrodeposits were characterized using scanning electron microscopy, electron-dispersive X-ray spectroscopy and X-ray diffraction methods, before and after electrochemical Dyeing process. The electrochemical activity of the iron-deposited graphite electrodes always stored in water seems to depend on the surface-bound Fe3+/Fe2+ redox species. Vat dyes like C.I. Vat Violet 1, C.I. Vat Green 1 and C.I. Vat Blue 4 could be efficiently dyed employing these above electrode materials. The colour intensity and washing fastness of the dyed fabrics were found to be equal with conventionally dyed fabrics. The electrodes could also be reused for the Dyeing process. ?? 2008 Elsevier B.V. All rights reserved.