The Experts below are selected from a list of 120 Experts worldwide ranked by ideXlab platform
Hideaki Kano - One of the best experts on this subject based on the ideXlab platform.
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effect of a waterproofing agent on the penetration process of water into a Cellulose Acetate Film by time resolved coherent anti stokes raman scattering cars microspectroscopy
Chemistry Letters, 2017Co-Authors: Rie Fujisawa, Tomoya Ohno, Philippe Leproux, Vincent Couderc, Hiroshi Kita, Kiyoshi Fukusaka, Hideaki KanoAbstract:The penetration of water into a Cellulose Acetate (CA) Film with m-terphenyl (m-TP) as a waterproofing agent (WPA) was investigated in real time by coherent anti-Stokes Raman scattering (CARS) microspectroscopy. Owing to the WPA, the water penetration was significantly suppressed. It was manifested by a small spectral change in comparison with the CA Films without m-TP. Moreover, the amplitude of the Raman band at 1600 cm−1 due to the OH bending mode, which is the marker band of water penetration, was significantly smaller. The present results indicate that m-TP has significant effects as a WPA for CA Films on the water penetration process.
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effect of a stretching procedure on the penetration process of water into a Cellulose Acetate Film by coherent anti stokes raman scattering cars microspectroscopy
Chemistry Letters, 2017Co-Authors: Rie Fujisawa, Tomoya Ohno, Philippe Leproux, Vincent Couderc, Hiroshi Kita, Kiyoshi Fukusaka, Hideaki KanoAbstract:The penetration process of water into a stretched Cellulose Acetate (CA) Film was investigated in real time by coherent anti-Stokes Raman scattering (CARS) microspectroscopy. The red shift of the C=O stretch mode due to hydrogen-bond formation was smaller than that of the unstretched Film. The appearance of two Raman bands at 1605 and 1665 cm−1, which was instantaneously observed for the unstretched CA Film, was reproduced but with much slower temporal response. The present results indicate significant effects of the stretching procedure on the water penetration process of CA Films.
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dynamical study of the water penetration process into a Cellulose Acetate Film studied by coherent anti stokes raman scattering cars microspectroscopy
Chemical Physics Letters, 2016Co-Authors: Rie Fujisawa, Tomoya Ohno, Junya F Kaneyasu, Philippe Leproux, Vincent Couderc, Hiroshi Kita, Hideaki KanoAbstract:Abstract The penetration process of water into a Cellulose Acetate Film was traced in real time by coherent anti-Stokes Raman scattering (CARS) microspectroscopy. The C O stretch mode was red-shifted due to hydrogen-bond formation. We also found that two Raman bands at 1605 cm −1 and 1665 cm −1 emerged only in the early stage of the water penetration process. Based on the combined analysis of the experimental and computational studies, these bands at 1605 cm −1 and 1665 cm −1 were assigned as the OH bend mode due to hydrogen-bonded penetrated water and hydrogen-bonded OH groups in pyranose rings, respectively.
Stella M Tzouwarakarayanni - One of the best experts on this subject based on the ideXlab platform.
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electrocatalysis of sulphide with a Cellulose Acetate Film bearing 2 6 dichlorophenolindophenol application to sewage using a fully automated flow injection manifold
Talanta, 2000Co-Authors: Ageliki B Florou, Mamas I Prodromidis, Miltiades I Karayannis, Stella M TzouwarakarayanniAbstract:Abstract The application of an electrochemical sensor, based on a glassy carbon electrode, modified with a Cellulose Acetate polymeric Film bearing 2,6-dichlorophenolindophenol (CA/DCPI-CME), for flow injection analysis of sulphide, is described. The overall reaction was found to obey a catalytic regeneration mechanism (EC mechanism) and the electrochemical rate constant kf for the electrocatalytic oxidation of sulphide was evaluated. The modified electrodes were mounted in a flow-injection manifold, poised at +0.08 mV versus Ag/AgCl/3 M KCl at pH 7.25 and utilised for the determination of sulphide in urban waste samples. The proposed method correlates well with a colorimetric method. Parameters such as working pH, sample size, flow rate and temperature were studied. Interferants of various compounds normally present in real samples were also tested. Calibration graphs were linear over the range 0.02–1 mM sodium sulphide for CA/DCPI-CMEs hydrolysed in KOH for 6 min. The throughput was 25 samples per h and the R.S.D. was 1.2% (n=7) for 0.1 mM sodium sulphide. Recoveries for spiked urban waste samples ranged from 99 to 120%. The sensor remained active for more than 2 weeks under specified conditions.
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flow electrochemical determination of ascorbic acid in real samples using a glassy carbon electrode modified with a Cellulose Acetate Film bearing 2 6 dichlorophenolindophenol
Analytica Chimica Acta, 2000Co-Authors: Ageliki B Florou, Mamas I Prodromidis, Miltiades I Karayannis, Stella M TzouwarakarayanniAbstract:Abstract An ascorbate sensor based on a glassy carbon electrode modified with a Cellulose Acetate polymeric Film bearing 2,6-dichlorophenolindophenol (CA/DCPI-CME) was constructed. The overall reaction obeys a catalytic regeneration mechanism (EC mechanism) and the electrochemical rate constant kf for the electrocatalytic oxidation of ascorbic acid was evaluated. The modified electrodes were mounted in a flow injection (FI) manifold, poised at +100 mV versus Ag/AgCl/3 M KCl at pH 6.5 and utilized for the determination of ascorbic acid in beverages and pharmaceuticals. Good correlation with a reference method was attained. Interferents of various molecular sizes were tested. Calibration graphs were linear over the range 0.02–1 and 0.1–6 mM ascorbic acid for CA/DCPI sensors hydrolyzed in KOH and ZnCl2 solution, respectively. The throughput was 25 samples per hour and the CV was for a 0.4 mM ascorbic acid solution 0.75 (n=14) and 1.2% (n=10) for CA/DCPI sensors hydrolyzed in KOH and ZnCl2 solution, respectively. The recovery was 92–110%. The sensors showed very good repeatability and operational stability.
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electrochemical behavior and analytical utility of a controlled porosity Cellulose Acetate Film bearing 2 6 dichlorophenolindophenol
Electroanalysis, 2000Co-Authors: Ageliki B Florou, Mamas I Prodromidis, Miltiades I Karayannis, Stella M TzouwarakarayanniAbstract:Glassy carbon electrodes coated with a Cellulose Acetate Film incorporating 2,6-dichlorophenolindophenol (CA/DCPI) were developed. At this multifunctional coating DCPI serves as a mediator for the electron transfer kinetics and in conjunction with the Cellulose Acetate’s size exclusion properties it results in a chemical sensor with great selectivity and stability. Access to the surface can be manipulated via controlled hydrolysis of the Film in KOH or ZnCl2 solutions. Different permeabilities are obtainable by hydrolyzing the Film over different time periods. Diffusion coefficients Dapp of these Films for analytes of different molecular sizes were determined with double step chronocoulometry. The electrochemical characteristics of the immobilized DCPI were explored using cyclic voltammetry. The formal potentials of the immobilized DCPI coating hydrolyzed in KOH, ZnCl2 and with ZnCl2 in the casting solution were found to be 70, 75, and 79 mV (vs. Ag/AgCl/ 3M KCl), respectively, at pH 6.5. The dissociation constants of the DCPI redox couple were found to be 5.2+ 0.1 (pKr) and 7.4+ 0.05 (pKo). The electrochemical rate constant k o of the of DCPI redox couple within the Film was also evaluated. The behavior of the sensor towards different reducing compounds was investigated. The sensors showed good operational and storage stability.
Rie Fujisawa - One of the best experts on this subject based on the ideXlab platform.
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effect of a waterproofing agent on the penetration process of water into a Cellulose Acetate Film by time resolved coherent anti stokes raman scattering cars microspectroscopy
Chemistry Letters, 2017Co-Authors: Rie Fujisawa, Tomoya Ohno, Philippe Leproux, Vincent Couderc, Hiroshi Kita, Kiyoshi Fukusaka, Hideaki KanoAbstract:The penetration of water into a Cellulose Acetate (CA) Film with m-terphenyl (m-TP) as a waterproofing agent (WPA) was investigated in real time by coherent anti-Stokes Raman scattering (CARS) microspectroscopy. Owing to the WPA, the water penetration was significantly suppressed. It was manifested by a small spectral change in comparison with the CA Films without m-TP. Moreover, the amplitude of the Raman band at 1600 cm−1 due to the OH bending mode, which is the marker band of water penetration, was significantly smaller. The present results indicate that m-TP has significant effects as a WPA for CA Films on the water penetration process.
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effect of a stretching procedure on the penetration process of water into a Cellulose Acetate Film by coherent anti stokes raman scattering cars microspectroscopy
Chemistry Letters, 2017Co-Authors: Rie Fujisawa, Tomoya Ohno, Philippe Leproux, Vincent Couderc, Hiroshi Kita, Kiyoshi Fukusaka, Hideaki KanoAbstract:The penetration process of water into a stretched Cellulose Acetate (CA) Film was investigated in real time by coherent anti-Stokes Raman scattering (CARS) microspectroscopy. The red shift of the C=O stretch mode due to hydrogen-bond formation was smaller than that of the unstretched Film. The appearance of two Raman bands at 1605 and 1665 cm−1, which was instantaneously observed for the unstretched CA Film, was reproduced but with much slower temporal response. The present results indicate significant effects of the stretching procedure on the water penetration process of CA Films.
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dynamical study of the water penetration process into a Cellulose Acetate Film studied by coherent anti stokes raman scattering cars microspectroscopy
Chemical Physics Letters, 2016Co-Authors: Rie Fujisawa, Tomoya Ohno, Junya F Kaneyasu, Philippe Leproux, Vincent Couderc, Hiroshi Kita, Hideaki KanoAbstract:Abstract The penetration process of water into a Cellulose Acetate Film was traced in real time by coherent anti-Stokes Raman scattering (CARS) microspectroscopy. The C O stretch mode was red-shifted due to hydrogen-bond formation. We also found that two Raman bands at 1605 cm −1 and 1665 cm −1 emerged only in the early stage of the water penetration process. Based on the combined analysis of the experimental and computational studies, these bands at 1605 cm −1 and 1665 cm −1 were assigned as the OH bend mode due to hydrogen-bonded penetrated water and hydrogen-bonded OH groups in pyranose rings, respectively.
Ageliki B Florou - One of the best experts on this subject based on the ideXlab platform.
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electrocatalysis of sulphide with a Cellulose Acetate Film bearing 2 6 dichlorophenolindophenol application to sewage using a fully automated flow injection manifold
Talanta, 2000Co-Authors: Ageliki B Florou, Mamas I Prodromidis, Miltiades I Karayannis, Stella M TzouwarakarayanniAbstract:Abstract The application of an electrochemical sensor, based on a glassy carbon electrode, modified with a Cellulose Acetate polymeric Film bearing 2,6-dichlorophenolindophenol (CA/DCPI-CME), for flow injection analysis of sulphide, is described. The overall reaction was found to obey a catalytic regeneration mechanism (EC mechanism) and the electrochemical rate constant kf for the electrocatalytic oxidation of sulphide was evaluated. The modified electrodes were mounted in a flow-injection manifold, poised at +0.08 mV versus Ag/AgCl/3 M KCl at pH 7.25 and utilised for the determination of sulphide in urban waste samples. The proposed method correlates well with a colorimetric method. Parameters such as working pH, sample size, flow rate and temperature were studied. Interferants of various compounds normally present in real samples were also tested. Calibration graphs were linear over the range 0.02–1 mM sodium sulphide for CA/DCPI-CMEs hydrolysed in KOH for 6 min. The throughput was 25 samples per h and the R.S.D. was 1.2% (n=7) for 0.1 mM sodium sulphide. Recoveries for spiked urban waste samples ranged from 99 to 120%. The sensor remained active for more than 2 weeks under specified conditions.
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flow electrochemical determination of ascorbic acid in real samples using a glassy carbon electrode modified with a Cellulose Acetate Film bearing 2 6 dichlorophenolindophenol
Analytica Chimica Acta, 2000Co-Authors: Ageliki B Florou, Mamas I Prodromidis, Miltiades I Karayannis, Stella M TzouwarakarayanniAbstract:Abstract An ascorbate sensor based on a glassy carbon electrode modified with a Cellulose Acetate polymeric Film bearing 2,6-dichlorophenolindophenol (CA/DCPI-CME) was constructed. The overall reaction obeys a catalytic regeneration mechanism (EC mechanism) and the electrochemical rate constant kf for the electrocatalytic oxidation of ascorbic acid was evaluated. The modified electrodes were mounted in a flow injection (FI) manifold, poised at +100 mV versus Ag/AgCl/3 M KCl at pH 6.5 and utilized for the determination of ascorbic acid in beverages and pharmaceuticals. Good correlation with a reference method was attained. Interferents of various molecular sizes were tested. Calibration graphs were linear over the range 0.02–1 and 0.1–6 mM ascorbic acid for CA/DCPI sensors hydrolyzed in KOH and ZnCl2 solution, respectively. The throughput was 25 samples per hour and the CV was for a 0.4 mM ascorbic acid solution 0.75 (n=14) and 1.2% (n=10) for CA/DCPI sensors hydrolyzed in KOH and ZnCl2 solution, respectively. The recovery was 92–110%. The sensors showed very good repeatability and operational stability.
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electrochemical behavior and analytical utility of a controlled porosity Cellulose Acetate Film bearing 2 6 dichlorophenolindophenol
Electroanalysis, 2000Co-Authors: Ageliki B Florou, Mamas I Prodromidis, Miltiades I Karayannis, Stella M TzouwarakarayanniAbstract:Glassy carbon electrodes coated with a Cellulose Acetate Film incorporating 2,6-dichlorophenolindophenol (CA/DCPI) were developed. At this multifunctional coating DCPI serves as a mediator for the electron transfer kinetics and in conjunction with the Cellulose Acetate’s size exclusion properties it results in a chemical sensor with great selectivity and stability. Access to the surface can be manipulated via controlled hydrolysis of the Film in KOH or ZnCl2 solutions. Different permeabilities are obtainable by hydrolyzing the Film over different time periods. Diffusion coefficients Dapp of these Films for analytes of different molecular sizes were determined with double step chronocoulometry. The electrochemical characteristics of the immobilized DCPI were explored using cyclic voltammetry. The formal potentials of the immobilized DCPI coating hydrolyzed in KOH, ZnCl2 and with ZnCl2 in the casting solution were found to be 70, 75, and 79 mV (vs. Ag/AgCl/ 3M KCl), respectively, at pH 6.5. The dissociation constants of the DCPI redox couple were found to be 5.2+ 0.1 (pKr) and 7.4+ 0.05 (pKo). The electrochemical rate constant k o of the of DCPI redox couple within the Film was also evaluated. The behavior of the sensor towards different reducing compounds was investigated. The sensors showed good operational and storage stability.
Tomoya Ohno - One of the best experts on this subject based on the ideXlab platform.
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effect of a waterproofing agent on the penetration process of water into a Cellulose Acetate Film by time resolved coherent anti stokes raman scattering cars microspectroscopy
Chemistry Letters, 2017Co-Authors: Rie Fujisawa, Tomoya Ohno, Philippe Leproux, Vincent Couderc, Hiroshi Kita, Kiyoshi Fukusaka, Hideaki KanoAbstract:The penetration of water into a Cellulose Acetate (CA) Film with m-terphenyl (m-TP) as a waterproofing agent (WPA) was investigated in real time by coherent anti-Stokes Raman scattering (CARS) microspectroscopy. Owing to the WPA, the water penetration was significantly suppressed. It was manifested by a small spectral change in comparison with the CA Films without m-TP. Moreover, the amplitude of the Raman band at 1600 cm−1 due to the OH bending mode, which is the marker band of water penetration, was significantly smaller. The present results indicate that m-TP has significant effects as a WPA for CA Films on the water penetration process.
-
effect of a stretching procedure on the penetration process of water into a Cellulose Acetate Film by coherent anti stokes raman scattering cars microspectroscopy
Chemistry Letters, 2017Co-Authors: Rie Fujisawa, Tomoya Ohno, Philippe Leproux, Vincent Couderc, Hiroshi Kita, Kiyoshi Fukusaka, Hideaki KanoAbstract:The penetration process of water into a stretched Cellulose Acetate (CA) Film was investigated in real time by coherent anti-Stokes Raman scattering (CARS) microspectroscopy. The red shift of the C=O stretch mode due to hydrogen-bond formation was smaller than that of the unstretched Film. The appearance of two Raman bands at 1605 and 1665 cm−1, which was instantaneously observed for the unstretched CA Film, was reproduced but with much slower temporal response. The present results indicate significant effects of the stretching procedure on the water penetration process of CA Films.
-
dynamical study of the water penetration process into a Cellulose Acetate Film studied by coherent anti stokes raman scattering cars microspectroscopy
Chemical Physics Letters, 2016Co-Authors: Rie Fujisawa, Tomoya Ohno, Junya F Kaneyasu, Philippe Leproux, Vincent Couderc, Hiroshi Kita, Hideaki KanoAbstract:Abstract The penetration process of water into a Cellulose Acetate Film was traced in real time by coherent anti-Stokes Raman scattering (CARS) microspectroscopy. The C O stretch mode was red-shifted due to hydrogen-bond formation. We also found that two Raman bands at 1605 cm −1 and 1665 cm −1 emerged only in the early stage of the water penetration process. Based on the combined analysis of the experimental and computational studies, these bands at 1605 cm −1 and 1665 cm −1 were assigned as the OH bend mode due to hydrogen-bonded penetrated water and hydrogen-bonded OH groups in pyranose rings, respectively.