The Experts below are selected from a list of 1965 Experts worldwide ranked by ideXlab platform

Giuseppe Rosace - One of the best experts on this subject based on the ideXlab platform.

  • sol gel 3 glycidoxypropyltriethoxysilane finishing on different fabrics the role of precursor concentration and catalyst on the textile performances and cytotoxic activity
    Joint International Conference on Information Sciences, 2017
    Co-Authors: Maria Rosaria Plutino, Ilaria Donelli, Alessio Mezzi, Omar Maschi, Claudio Colleoni, Emanuela Guido, Giuliano Freddi, Giuseppe Rosace
    Abstract:

    In this paper, the influence of 3-glycidoxypropyltriethoxysilane (GPTES) based organic-inorganic coatings on the properties of treated textile fabrics was studied. All experimental results were deeply analyzed and thereafter correlated with the employed silica precursor concentration and with the presence of the BF3OEt2 (Boron trifluoride diethyl etherate), used as Epoxy Ring Opening catalyst. SEM analysis, FT-IR spectroscopy, X-ray Photoelectron Spectroscopy (XPS), thermogravimetric analysis (TGA) and washing fastness tests of the sol-gel treated cotton fabric samples were firstly exploited in order to characterize the morphological and structural features of the achieved coatings. Finally, the influence of the resulting nanohybrid coatings was explored in terms of abrasion resistance, tensile strength and elongation properties of treated cotton, polyester and silk fabrics. The catalyst amounts seem to strongly improve the formation of coatings, but still they do not influence the wear resistance of treated textile fabrics to the same extent. Indeed, it was found that increasing catalyst/GPTES ratio leads to a more cross linked inorganic 3D-network. GPTES itself was not found to affect the bulk properties of the selected textile and the resulting coatings were not so rigid to hardly modify the mechanical properties of the treated samples. Finally, it is worth mentioning that in all case the obtained 3-glycidoxypropyltriethoxysilane-based chemical finishing have shown no cytotoxic effects on human skin cells.

  • sol gel 3 glycidoxypropyltriethoxysilane finishing on different fabrics the role of precursor concentration and catalyst on the textile performances and cytotoxic activity
    Joint International Conference on Information Sciences, 2017
    Co-Authors: Maria Rosaria Plutino, Ilaria Donelli, Alessio Mezzi, Omar Maschi, Claudio Colleoni, Emanuela Guido, Giuliano Freddi, Giuseppe Rosace
    Abstract:

    In this paper, the influence of 3-glycidoxypropyltriethoxysilane (GPTES) based organic-inorganic coatings on the properties of treated textile fabrics was studied. All experimental results were deeply analyzed and thereafter correlated with the employed silica precursor concentration and with the presence of the BF3OEt2 (Boron trifluoride diethyl etherate), used as Epoxy Ring Opening catalyst. SEM analysis, FT-IR spectroscopy, X-ray Photoelectron Spectroscopy (XPS), thermogravimetric analysis (TGA) and washing fastness tests of the sol-gel treated cotton fabric samples were firstly exploited in order to characterize the morphological and structural features of the achieved coatings. Finally, the influence of the resulting nanohybrid coatings was explored in terms of abrasion resistance, tensile strength and elongation properties of treated cotton, polyester and silk fabrics. The catalyst amounts seem to strongly improve the formation of coatings, but still they do not influence the wear resistance of treated textile fabrics to the same extent. Indeed, it was found that increasing catalyst/GPTES ratio leads to a more cross linked inorganic 3D-network. GPTES itself was not found to affect the bulk properties of the selected textile and the resulting coatings were not so rigid to hardly modify the mechanical properties of the treated samples. Finally, it is worth mentioning that in all case the obtained 3-glycidoxypropyltriethoxysilane-based chemical finishing have shown no cytotoxic effects on human skin cells.

  • Halochromic resorufin-GPTMS hybrid sol-gel: Chemical-physical properties and use as pH sensor fabric coating
    Sensors and Actuators B: Chemical, 2017
    Co-Authors: Giuseppe Rosace, Claudio Colleoni, Emanuela Guido, Marco Brucale, Elpida Piperopoulos, Candida Milone, Maria Rosaria Plutino
    Abstract:

    Abstract The hybrid GPTMS ( 3 -glycidoxypropyltrimethoxysilane) gel containing the chromophore molecule of the litmus dye, Resorufin ( 7 -Hydroxy-3 H -phenoxazin-3-one), was prepared by sol-gel method through Epoxy Ring Opening reaction catalyzed by traces of 1 -methylimidazole in acidic ethanol solutions. The wet-gel solution was fully characterized by means of different spectroscopic techniques. Proton and heteronuclear NMR and FT-IR spectroscopy have confirmed the immobilization of the Resorufin into the GPTMS polyethylene oxide polymer, through GPTMS Epoxy Ring Opening and monomer diol-GPTMS condensation/hydrolysis. The halochromic activity of the Resorufin-GPTMS hybrid sol-gel was monitored by UV–vis spectroscopy, in buffered solutions at different pH values, in comparison with the corresponding dye. FT-IR spectroscopy was also used on solid xerogel residue coveRing glass surface to demonstrate the attempted GPTMS Epoxy-Ring Opening. The morphology of the treated and washed cotton samples, compared to the original one, was investigated by SEM, SEM-EDX and AFM microscopy analysis, in order to assess the aspect of the fibers after the different finishing treatments in the micrometric scale.

  • Influence of catalyst in the synthesis of a cellulose-based sensor: Kinetic study of 3-glycidoxypropyltrimethoxysilane Epoxy Ring Opening by Lewis acid
    Sensors and Actuators B: Chemical, 2014
    Co-Authors: Emanuela Guido, Maria Rosaria Plutino, Claudio Colleoni, Karen De Clerck, Giuseppe Rosace
    Abstract:

    Abstract Hybrid halochromic sensor coatings were realized immobilizing Nitrazine Yellow (NY) onto cotton fabrics via the Epoxy group of 3-glycidoxypropyltrimethoxysilane (GPTMS) silica precursor in acidic condition. Boron trifluoride diethyl etherate (BF3OEt2) in a various percentage range (1–10%, w/w GPTMS) has been used to catalyze the epoxide Ring Opening. In order to optimize the system, an FTIR study has been developed and kinetic data were obtained for the Epoxy Ring Opening process. A linear correlation between the obtained kinetic rates and BF3 percentage was observed. By nuclear magnetic resonance (NMR) analysis in solution the real structure of NY, derived from an attack of diazonium salt to para hydroxyl position, was confirmed and the final product of the reaction between NY and GPTMS was characterized. Finally, the different amounts of catalyst were found to affect the coatings wash fastness and the halochromic response of the cellulose-based sensors.

Xinmiao Liang - One of the best experts on this subject based on the ideXlab platform.

  • synthesis and chromatographic evaluation of phenyl tetrazole bonded stationary phase based on thiol Epoxy Ring Opening reaction
    Journal of Separation Science, 2018
    Co-Authors: Gaowa Jin, Yanming Liu, Fan Yang, Jingyu Yan, Weijia Zhou, Zhimou Guo, Jianhua Zhu, Xinmiao Liang
    Abstract:

    A silica-based reversed-phase stationary phase bonding with phenyl and tetrazole groups was synthesized by thiol-Epoxy Ring Opening reaction. The bonded groups could not only provide hydrophobic interaction, but also π-π, hydrogen bonding, electrostatic interactions, and so on. The results of characterization with elemental analysis and solid-state 13 C cross-polarization magic-angle-spinning NMR spectroscopy indicated the successful preparation of phenyl/tetrazole sulfoether bonded stationary phase. Chromatographic evaluation revealed that phenyl/tetrazole sulfoether bonded stationary phase behaved well under the reversed-phase mode. The column parameters (H, S*, A, B, and C) showed different selectivity compared with some typical commercial columns, and it was validated by the separation of estrogen, ginsenoside, alkaloid samples. Based on the different selectivity between phenyl/tetrazole sulfoether bonded stationary phase and C18 columns, phenyl/tetrazole sulfoether bonded stationary phase also showed potential to construct a 2D reversed-phase liquid chromatography system with C18. And it was verified by the separation of corydalis tuber and curcuma zedoary extracts.

Maria Rosaria Plutino - One of the best experts on this subject based on the ideXlab platform.

  • sol gel 3 glycidoxypropyltriethoxysilane finishing on different fabrics the role of precursor concentration and catalyst on the textile performances and cytotoxic activity
    Joint International Conference on Information Sciences, 2017
    Co-Authors: Maria Rosaria Plutino, Ilaria Donelli, Alessio Mezzi, Omar Maschi, Claudio Colleoni, Emanuela Guido, Giuliano Freddi, Giuseppe Rosace
    Abstract:

    In this paper, the influence of 3-glycidoxypropyltriethoxysilane (GPTES) based organic-inorganic coatings on the properties of treated textile fabrics was studied. All experimental results were deeply analyzed and thereafter correlated with the employed silica precursor concentration and with the presence of the BF3OEt2 (Boron trifluoride diethyl etherate), used as Epoxy Ring Opening catalyst. SEM analysis, FT-IR spectroscopy, X-ray Photoelectron Spectroscopy (XPS), thermogravimetric analysis (TGA) and washing fastness tests of the sol-gel treated cotton fabric samples were firstly exploited in order to characterize the morphological and structural features of the achieved coatings. Finally, the influence of the resulting nanohybrid coatings was explored in terms of abrasion resistance, tensile strength and elongation properties of treated cotton, polyester and silk fabrics. The catalyst amounts seem to strongly improve the formation of coatings, but still they do not influence the wear resistance of treated textile fabrics to the same extent. Indeed, it was found that increasing catalyst/GPTES ratio leads to a more cross linked inorganic 3D-network. GPTES itself was not found to affect the bulk properties of the selected textile and the resulting coatings were not so rigid to hardly modify the mechanical properties of the treated samples. Finally, it is worth mentioning that in all case the obtained 3-glycidoxypropyltriethoxysilane-based chemical finishing have shown no cytotoxic effects on human skin cells.

  • sol gel 3 glycidoxypropyltriethoxysilane finishing on different fabrics the role of precursor concentration and catalyst on the textile performances and cytotoxic activity
    Joint International Conference on Information Sciences, 2017
    Co-Authors: Maria Rosaria Plutino, Ilaria Donelli, Alessio Mezzi, Omar Maschi, Claudio Colleoni, Emanuela Guido, Giuliano Freddi, Giuseppe Rosace
    Abstract:

    In this paper, the influence of 3-glycidoxypropyltriethoxysilane (GPTES) based organic-inorganic coatings on the properties of treated textile fabrics was studied. All experimental results were deeply analyzed and thereafter correlated with the employed silica precursor concentration and with the presence of the BF3OEt2 (Boron trifluoride diethyl etherate), used as Epoxy Ring Opening catalyst. SEM analysis, FT-IR spectroscopy, X-ray Photoelectron Spectroscopy (XPS), thermogravimetric analysis (TGA) and washing fastness tests of the sol-gel treated cotton fabric samples were firstly exploited in order to characterize the morphological and structural features of the achieved coatings. Finally, the influence of the resulting nanohybrid coatings was explored in terms of abrasion resistance, tensile strength and elongation properties of treated cotton, polyester and silk fabrics. The catalyst amounts seem to strongly improve the formation of coatings, but still they do not influence the wear resistance of treated textile fabrics to the same extent. Indeed, it was found that increasing catalyst/GPTES ratio leads to a more cross linked inorganic 3D-network. GPTES itself was not found to affect the bulk properties of the selected textile and the resulting coatings were not so rigid to hardly modify the mechanical properties of the treated samples. Finally, it is worth mentioning that in all case the obtained 3-glycidoxypropyltriethoxysilane-based chemical finishing have shown no cytotoxic effects on human skin cells.

  • Halochromic resorufin-GPTMS hybrid sol-gel: Chemical-physical properties and use as pH sensor fabric coating
    Sensors and Actuators B: Chemical, 2017
    Co-Authors: Giuseppe Rosace, Claudio Colleoni, Emanuela Guido, Marco Brucale, Elpida Piperopoulos, Candida Milone, Maria Rosaria Plutino
    Abstract:

    Abstract The hybrid GPTMS ( 3 -glycidoxypropyltrimethoxysilane) gel containing the chromophore molecule of the litmus dye, Resorufin ( 7 -Hydroxy-3 H -phenoxazin-3-one), was prepared by sol-gel method through Epoxy Ring Opening reaction catalyzed by traces of 1 -methylimidazole in acidic ethanol solutions. The wet-gel solution was fully characterized by means of different spectroscopic techniques. Proton and heteronuclear NMR and FT-IR spectroscopy have confirmed the immobilization of the Resorufin into the GPTMS polyethylene oxide polymer, through GPTMS Epoxy Ring Opening and monomer diol-GPTMS condensation/hydrolysis. The halochromic activity of the Resorufin-GPTMS hybrid sol-gel was monitored by UV–vis spectroscopy, in buffered solutions at different pH values, in comparison with the corresponding dye. FT-IR spectroscopy was also used on solid xerogel residue coveRing glass surface to demonstrate the attempted GPTMS Epoxy-Ring Opening. The morphology of the treated and washed cotton samples, compared to the original one, was investigated by SEM, SEM-EDX and AFM microscopy analysis, in order to assess the aspect of the fibers after the different finishing treatments in the micrometric scale.

  • Influence of catalyst in the synthesis of a cellulose-based sensor: Kinetic study of 3-glycidoxypropyltrimethoxysilane Epoxy Ring Opening by Lewis acid
    Sensors and Actuators B: Chemical, 2014
    Co-Authors: Emanuela Guido, Maria Rosaria Plutino, Claudio Colleoni, Karen De Clerck, Giuseppe Rosace
    Abstract:

    Abstract Hybrid halochromic sensor coatings were realized immobilizing Nitrazine Yellow (NY) onto cotton fabrics via the Epoxy group of 3-glycidoxypropyltrimethoxysilane (GPTMS) silica precursor in acidic condition. Boron trifluoride diethyl etherate (BF3OEt2) in a various percentage range (1–10%, w/w GPTMS) has been used to catalyze the epoxide Ring Opening. In order to optimize the system, an FTIR study has been developed and kinetic data were obtained for the Epoxy Ring Opening process. A linear correlation between the obtained kinetic rates and BF3 percentage was observed. By nuclear magnetic resonance (NMR) analysis in solution the real structure of NY, derived from an attack of diazonium salt to para hydroxyl position, was confirmed and the final product of the reaction between NY and GPTMS was characterized. Finally, the different amounts of catalyst were found to affect the coatings wash fastness and the halochromic response of the cellulose-based sensors.

Emanuela Guido - One of the best experts on this subject based on the ideXlab platform.

  • sol gel 3 glycidoxypropyltriethoxysilane finishing on different fabrics the role of precursor concentration and catalyst on the textile performances and cytotoxic activity
    Joint International Conference on Information Sciences, 2017
    Co-Authors: Maria Rosaria Plutino, Ilaria Donelli, Alessio Mezzi, Omar Maschi, Claudio Colleoni, Emanuela Guido, Giuliano Freddi, Giuseppe Rosace
    Abstract:

    In this paper, the influence of 3-glycidoxypropyltriethoxysilane (GPTES) based organic-inorganic coatings on the properties of treated textile fabrics was studied. All experimental results were deeply analyzed and thereafter correlated with the employed silica precursor concentration and with the presence of the BF3OEt2 (Boron trifluoride diethyl etherate), used as Epoxy Ring Opening catalyst. SEM analysis, FT-IR spectroscopy, X-ray Photoelectron Spectroscopy (XPS), thermogravimetric analysis (TGA) and washing fastness tests of the sol-gel treated cotton fabric samples were firstly exploited in order to characterize the morphological and structural features of the achieved coatings. Finally, the influence of the resulting nanohybrid coatings was explored in terms of abrasion resistance, tensile strength and elongation properties of treated cotton, polyester and silk fabrics. The catalyst amounts seem to strongly improve the formation of coatings, but still they do not influence the wear resistance of treated textile fabrics to the same extent. Indeed, it was found that increasing catalyst/GPTES ratio leads to a more cross linked inorganic 3D-network. GPTES itself was not found to affect the bulk properties of the selected textile and the resulting coatings were not so rigid to hardly modify the mechanical properties of the treated samples. Finally, it is worth mentioning that in all case the obtained 3-glycidoxypropyltriethoxysilane-based chemical finishing have shown no cytotoxic effects on human skin cells.

  • sol gel 3 glycidoxypropyltriethoxysilane finishing on different fabrics the role of precursor concentration and catalyst on the textile performances and cytotoxic activity
    Joint International Conference on Information Sciences, 2017
    Co-Authors: Maria Rosaria Plutino, Ilaria Donelli, Alessio Mezzi, Omar Maschi, Claudio Colleoni, Emanuela Guido, Giuliano Freddi, Giuseppe Rosace
    Abstract:

    In this paper, the influence of 3-glycidoxypropyltriethoxysilane (GPTES) based organic-inorganic coatings on the properties of treated textile fabrics was studied. All experimental results were deeply analyzed and thereafter correlated with the employed silica precursor concentration and with the presence of the BF3OEt2 (Boron trifluoride diethyl etherate), used as Epoxy Ring Opening catalyst. SEM analysis, FT-IR spectroscopy, X-ray Photoelectron Spectroscopy (XPS), thermogravimetric analysis (TGA) and washing fastness tests of the sol-gel treated cotton fabric samples were firstly exploited in order to characterize the morphological and structural features of the achieved coatings. Finally, the influence of the resulting nanohybrid coatings was explored in terms of abrasion resistance, tensile strength and elongation properties of treated cotton, polyester and silk fabrics. The catalyst amounts seem to strongly improve the formation of coatings, but still they do not influence the wear resistance of treated textile fabrics to the same extent. Indeed, it was found that increasing catalyst/GPTES ratio leads to a more cross linked inorganic 3D-network. GPTES itself was not found to affect the bulk properties of the selected textile and the resulting coatings were not so rigid to hardly modify the mechanical properties of the treated samples. Finally, it is worth mentioning that in all case the obtained 3-glycidoxypropyltriethoxysilane-based chemical finishing have shown no cytotoxic effects on human skin cells.

  • Halochromic resorufin-GPTMS hybrid sol-gel: Chemical-physical properties and use as pH sensor fabric coating
    Sensors and Actuators B: Chemical, 2017
    Co-Authors: Giuseppe Rosace, Claudio Colleoni, Emanuela Guido, Marco Brucale, Elpida Piperopoulos, Candida Milone, Maria Rosaria Plutino
    Abstract:

    Abstract The hybrid GPTMS ( 3 -glycidoxypropyltrimethoxysilane) gel containing the chromophore molecule of the litmus dye, Resorufin ( 7 -Hydroxy-3 H -phenoxazin-3-one), was prepared by sol-gel method through Epoxy Ring Opening reaction catalyzed by traces of 1 -methylimidazole in acidic ethanol solutions. The wet-gel solution was fully characterized by means of different spectroscopic techniques. Proton and heteronuclear NMR and FT-IR spectroscopy have confirmed the immobilization of the Resorufin into the GPTMS polyethylene oxide polymer, through GPTMS Epoxy Ring Opening and monomer diol-GPTMS condensation/hydrolysis. The halochromic activity of the Resorufin-GPTMS hybrid sol-gel was monitored by UV–vis spectroscopy, in buffered solutions at different pH values, in comparison with the corresponding dye. FT-IR spectroscopy was also used on solid xerogel residue coveRing glass surface to demonstrate the attempted GPTMS Epoxy-Ring Opening. The morphology of the treated and washed cotton samples, compared to the original one, was investigated by SEM, SEM-EDX and AFM microscopy analysis, in order to assess the aspect of the fibers after the different finishing treatments in the micrometric scale.

  • Influence of catalyst in the synthesis of a cellulose-based sensor: Kinetic study of 3-glycidoxypropyltrimethoxysilane Epoxy Ring Opening by Lewis acid
    Sensors and Actuators B: Chemical, 2014
    Co-Authors: Emanuela Guido, Maria Rosaria Plutino, Claudio Colleoni, Karen De Clerck, Giuseppe Rosace
    Abstract:

    Abstract Hybrid halochromic sensor coatings were realized immobilizing Nitrazine Yellow (NY) onto cotton fabrics via the Epoxy group of 3-glycidoxypropyltrimethoxysilane (GPTMS) silica precursor in acidic condition. Boron trifluoride diethyl etherate (BF3OEt2) in a various percentage range (1–10%, w/w GPTMS) has been used to catalyze the epoxide Ring Opening. In order to optimize the system, an FTIR study has been developed and kinetic data were obtained for the Epoxy Ring Opening process. A linear correlation between the obtained kinetic rates and BF3 percentage was observed. By nuclear magnetic resonance (NMR) analysis in solution the real structure of NY, derived from an attack of diazonium salt to para hydroxyl position, was confirmed and the final product of the reaction between NY and GPTMS was characterized. Finally, the different amounts of catalyst were found to affect the coatings wash fastness and the halochromic response of the cellulose-based sensors.

Claudio Colleoni - One of the best experts on this subject based on the ideXlab platform.

  • sol gel 3 glycidoxypropyltriethoxysilane finishing on different fabrics the role of precursor concentration and catalyst on the textile performances and cytotoxic activity
    Joint International Conference on Information Sciences, 2017
    Co-Authors: Maria Rosaria Plutino, Ilaria Donelli, Alessio Mezzi, Omar Maschi, Claudio Colleoni, Emanuela Guido, Giuliano Freddi, Giuseppe Rosace
    Abstract:

    In this paper, the influence of 3-glycidoxypropyltriethoxysilane (GPTES) based organic-inorganic coatings on the properties of treated textile fabrics was studied. All experimental results were deeply analyzed and thereafter correlated with the employed silica precursor concentration and with the presence of the BF3OEt2 (Boron trifluoride diethyl etherate), used as Epoxy Ring Opening catalyst. SEM analysis, FT-IR spectroscopy, X-ray Photoelectron Spectroscopy (XPS), thermogravimetric analysis (TGA) and washing fastness tests of the sol-gel treated cotton fabric samples were firstly exploited in order to characterize the morphological and structural features of the achieved coatings. Finally, the influence of the resulting nanohybrid coatings was explored in terms of abrasion resistance, tensile strength and elongation properties of treated cotton, polyester and silk fabrics. The catalyst amounts seem to strongly improve the formation of coatings, but still they do not influence the wear resistance of treated textile fabrics to the same extent. Indeed, it was found that increasing catalyst/GPTES ratio leads to a more cross linked inorganic 3D-network. GPTES itself was not found to affect the bulk properties of the selected textile and the resulting coatings were not so rigid to hardly modify the mechanical properties of the treated samples. Finally, it is worth mentioning that in all case the obtained 3-glycidoxypropyltriethoxysilane-based chemical finishing have shown no cytotoxic effects on human skin cells.

  • sol gel 3 glycidoxypropyltriethoxysilane finishing on different fabrics the role of precursor concentration and catalyst on the textile performances and cytotoxic activity
    Joint International Conference on Information Sciences, 2017
    Co-Authors: Maria Rosaria Plutino, Ilaria Donelli, Alessio Mezzi, Omar Maschi, Claudio Colleoni, Emanuela Guido, Giuliano Freddi, Giuseppe Rosace
    Abstract:

    In this paper, the influence of 3-glycidoxypropyltriethoxysilane (GPTES) based organic-inorganic coatings on the properties of treated textile fabrics was studied. All experimental results were deeply analyzed and thereafter correlated with the employed silica precursor concentration and with the presence of the BF3OEt2 (Boron trifluoride diethyl etherate), used as Epoxy Ring Opening catalyst. SEM analysis, FT-IR spectroscopy, X-ray Photoelectron Spectroscopy (XPS), thermogravimetric analysis (TGA) and washing fastness tests of the sol-gel treated cotton fabric samples were firstly exploited in order to characterize the morphological and structural features of the achieved coatings. Finally, the influence of the resulting nanohybrid coatings was explored in terms of abrasion resistance, tensile strength and elongation properties of treated cotton, polyester and silk fabrics. The catalyst amounts seem to strongly improve the formation of coatings, but still they do not influence the wear resistance of treated textile fabrics to the same extent. Indeed, it was found that increasing catalyst/GPTES ratio leads to a more cross linked inorganic 3D-network. GPTES itself was not found to affect the bulk properties of the selected textile and the resulting coatings were not so rigid to hardly modify the mechanical properties of the treated samples. Finally, it is worth mentioning that in all case the obtained 3-glycidoxypropyltriethoxysilane-based chemical finishing have shown no cytotoxic effects on human skin cells.

  • Halochromic resorufin-GPTMS hybrid sol-gel: Chemical-physical properties and use as pH sensor fabric coating
    Sensors and Actuators B: Chemical, 2017
    Co-Authors: Giuseppe Rosace, Claudio Colleoni, Emanuela Guido, Marco Brucale, Elpida Piperopoulos, Candida Milone, Maria Rosaria Plutino
    Abstract:

    Abstract The hybrid GPTMS ( 3 -glycidoxypropyltrimethoxysilane) gel containing the chromophore molecule of the litmus dye, Resorufin ( 7 -Hydroxy-3 H -phenoxazin-3-one), was prepared by sol-gel method through Epoxy Ring Opening reaction catalyzed by traces of 1 -methylimidazole in acidic ethanol solutions. The wet-gel solution was fully characterized by means of different spectroscopic techniques. Proton and heteronuclear NMR and FT-IR spectroscopy have confirmed the immobilization of the Resorufin into the GPTMS polyethylene oxide polymer, through GPTMS Epoxy Ring Opening and monomer diol-GPTMS condensation/hydrolysis. The halochromic activity of the Resorufin-GPTMS hybrid sol-gel was monitored by UV–vis spectroscopy, in buffered solutions at different pH values, in comparison with the corresponding dye. FT-IR spectroscopy was also used on solid xerogel residue coveRing glass surface to demonstrate the attempted GPTMS Epoxy-Ring Opening. The morphology of the treated and washed cotton samples, compared to the original one, was investigated by SEM, SEM-EDX and AFM microscopy analysis, in order to assess the aspect of the fibers after the different finishing treatments in the micrometric scale.

  • Influence of catalyst in the synthesis of a cellulose-based sensor: Kinetic study of 3-glycidoxypropyltrimethoxysilane Epoxy Ring Opening by Lewis acid
    Sensors and Actuators B: Chemical, 2014
    Co-Authors: Emanuela Guido, Maria Rosaria Plutino, Claudio Colleoni, Karen De Clerck, Giuseppe Rosace
    Abstract:

    Abstract Hybrid halochromic sensor coatings were realized immobilizing Nitrazine Yellow (NY) onto cotton fabrics via the Epoxy group of 3-glycidoxypropyltrimethoxysilane (GPTMS) silica precursor in acidic condition. Boron trifluoride diethyl etherate (BF3OEt2) in a various percentage range (1–10%, w/w GPTMS) has been used to catalyze the epoxide Ring Opening. In order to optimize the system, an FTIR study has been developed and kinetic data were obtained for the Epoxy Ring Opening process. A linear correlation between the obtained kinetic rates and BF3 percentage was observed. By nuclear magnetic resonance (NMR) analysis in solution the real structure of NY, derived from an attack of diazonium salt to para hydroxyl position, was confirmed and the final product of the reaction between NY and GPTMS was characterized. Finally, the different amounts of catalyst were found to affect the coatings wash fastness and the halochromic response of the cellulose-based sensors.