The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
Jiři Mosinger - One of the best experts on this subject based on the ideXlab platform.
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photofunctional polyurethane nanofabrics doped by zinc Tetraphenylporphyrin and zinc phthalocyanine photosensitizers
Journal of Fluorescence, 2009Co-Authors: Pavel Kubát, Kamil Lang, Jan Sýkora, Martin Hof, Lukas Plistil, Jiři Mosinger, Bedřich MosingerAbstract:Polymeric polyurethane nanofabrics doped by zinc Tetraphenylporphyrin (ZnTPP) and/or zinc phthalocyanine (ZnPc) photosensitizers were prepared by the electrospinning method and characterized by microscopic methods, steady-state and time-resolved fluorescence, and absorption spectroscopy. Nanofabrics doped by both ZnTPP and ZnPc efficiently harvest visible light to generate triplet states and singlet oxygen O2(1Δg) with a lifetime of about 15 μs in air atmosphere. The energy transfer between the excited singlet states of ZnTPP and ground states of ZnPc is described in details. All nanofabrics have bactericidal surfaces and photooxidize inorganic and organic substrates. ZnTPP and ZnPc in the polyurethane nanofabrics are less photostable than incorporated free-base Tetraphenylporphyrin (TPP).
Jacques Lalevée - One of the best experts on this subject based on the ideXlab platform.
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Zinc Tetraphenylporphyrin as High Performance Visible Light Photoinitiator of Cationic Photosensitive Resins for LED Projector 3D Printing Applications
Macromolecules, 2017Co-Authors: Assi Al Mousawi, Frédéric Dumur, Tayssir Hamieh, Joumana Toufaily, Cyril Poriel, Jean-pierre Fouassier, Jacques LalevéeAbstract:Zinc Tetraphenylporphyrin (ZnTPP) is proposed as a high performance visible light photoinitiator for both the free radical polymerization (FRP) of methacrylates (thick films) and the cationic polymerization (CP) of epoxides (thin films) upon visible light exposure using light emitting diodes (LEDs) at 405, 455, 477, and 530 nm. ZnTPP combined with an iodonium salt shows excellent polymerization initiating abilities and high final conversions were obtained. Remarkably, for the ligand alone (Tetraphenylporphyrin derivative, H2TPMP) used as photoinitiator, no polymerization occurs, indicating the importance of the metal in the initiating complex for an efficient process. A full picture of the involved chemical mechanisms is given. The high performance of ZnTPP as cationic initiating system is also well shown for new cationic 3D printing resins upon exposure to LED projector at 405 nm. © 2017 American Chemical Society.
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zinc Tetraphenylporphyrin as high performance visible light photoinitiator of cationic photosensitive resins for led projector 3d printing applications
Macromolecules, 2017Co-Authors: Assi Al Mousawi, Tayssir Hamieh, Frederic Dumu, Joumana Toufaily, Jeanpierre Fouassie, Cyril Poriel, Jacques LalevéeAbstract:Zinc Tetraphenylporphyrin (ZnTPP) is proposed as a high performance visible light photoinitiator for both the free radical polymerization (FRP) of methacrylates (thick films) and the cationic polymerization (CP) of epoxides (thin films) upon visible light exposure using light emitting diodes (LEDs) at 405, 455, 477, and 530 nm. ZnTPP combined with an iodonium salt shows excellent polymerization initiating abilities and high final conversions were obtained. Remarkably, for the ligand alone (Tetraphenylporphyrin derivative, H2TPMP) used as photoinitiator, no polymerization occurs, indicating the importance of the metal in the initiating complex for an efficient process. A full picture of the involved chemical mechanisms is given. The high performance of ZnTPP as cationic initiating system is also well shown for new cationic 3D printing resins upon exposure to LED projector at 405 nm.
Xinghua Xia - One of the best experts on this subject based on the ideXlab platform.
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oriented self assembled monolayer of zn ii Tetraphenylporphyrin on tio2 electrode for photoelectrochemical analysis
Analytical Chemistry, 2019Co-Authors: Yue Zhou, Yi Shi, Fengbin Wang, Xinghua XiaAbstract:The photoelectrochemical performance of a zinc porphyrin sensitized TiO2 photoelectrode fabricated through the axial-coordination strategy has been studied. Zinc(II) Tetraphenylporphyrin (TPPZn) wa...
Cyril Poriel - One of the best experts on this subject based on the ideXlab platform.
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Zinc Tetraphenylporphyrin as High Performance Visible Light Photoinitiator of Cationic Photosensitive Resins for LED Projector 3D Printing Applications
Macromolecules, 2017Co-Authors: Assi Al Mousawi, Frédéric Dumur, Tayssir Hamieh, Joumana Toufaily, Cyril Poriel, Jean-pierre Fouassier, Jacques LalevéeAbstract:Zinc Tetraphenylporphyrin (ZnTPP) is proposed as a high performance visible light photoinitiator for both the free radical polymerization (FRP) of methacrylates (thick films) and the cationic polymerization (CP) of epoxides (thin films) upon visible light exposure using light emitting diodes (LEDs) at 405, 455, 477, and 530 nm. ZnTPP combined with an iodonium salt shows excellent polymerization initiating abilities and high final conversions were obtained. Remarkably, for the ligand alone (Tetraphenylporphyrin derivative, H2TPMP) used as photoinitiator, no polymerization occurs, indicating the importance of the metal in the initiating complex for an efficient process. A full picture of the involved chemical mechanisms is given. The high performance of ZnTPP as cationic initiating system is also well shown for new cationic 3D printing resins upon exposure to LED projector at 405 nm. © 2017 American Chemical Society.
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zinc Tetraphenylporphyrin as high performance visible light photoinitiator of cationic photosensitive resins for led projector 3d printing applications
Macromolecules, 2017Co-Authors: Assi Al Mousawi, Tayssir Hamieh, Frederic Dumu, Joumana Toufaily, Jeanpierre Fouassie, Cyril Poriel, Jacques LalevéeAbstract:Zinc Tetraphenylporphyrin (ZnTPP) is proposed as a high performance visible light photoinitiator for both the free radical polymerization (FRP) of methacrylates (thick films) and the cationic polymerization (CP) of epoxides (thin films) upon visible light exposure using light emitting diodes (LEDs) at 405, 455, 477, and 530 nm. ZnTPP combined with an iodonium salt shows excellent polymerization initiating abilities and high final conversions were obtained. Remarkably, for the ligand alone (Tetraphenylporphyrin derivative, H2TPMP) used as photoinitiator, no polymerization occurs, indicating the importance of the metal in the initiating complex for an efficient process. A full picture of the involved chemical mechanisms is given. The high performance of ZnTPP as cationic initiating system is also well shown for new cationic 3D printing resins upon exposure to LED projector at 405 nm.
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On the nature of the electrode surface modification by cathodic reduction of tetraarylporphyrin diazonium salts in aqueous media
Electrochemistry Communications, 2012Co-Authors: Matthieu Picot, Cyril Poriel, Irène Nicolas, Joëlle Rault-berthelot, Frédéric BarrièreAbstract:Different substrates have been modified through electroreduction of tetraarylporphyrin diazonium salts, H2TPP-N2 + or H2TPP-(N2 +)4, generated in situ in acidic aqueous media from monoamino-TPP (H2TPP-NH2) or tetraamino-TPP (H2TPP-(NH2)4) in low concentration (5.1−4 M). The modification of the electrodes with H2TPP-(NH2)4 leads to a purple deposit (PolyH2TPP-1) strongly linked to the electrode surface whereas those obtained from H2TPP-NH2 were not covalently linked to the electrode surface, soluble in organic solvents and identified as Tetraphenylporphyrin (H2TPP). The deposits have been characterized by electrochemistry, atomic force microscopy (AFM) and UV-Visible absorption spectroscopy. Cyclic voltammetry of PolyH2TPP-1 revealed an electroactivity akin to that of polytetraarylporphyrin obtained by anodic electropolymerization of H2TPP (~2.1−3 M) in strictly anhydrous electrolytic medium (PolyH2TPP-2). In light of their UV-vis spectra, the two related polymers present different intermolecular interactions and macromolecular organization. Tetraphenylporphyrin precipitates after reduction of the mono-aryldiazonium in H2O. Reduction of the tetra-aryldiazonium yields a deposit of poly-Tetraphenylporphyrin. The polymer displays significant inter-porphyrin interactions (J-aggregation).
Assi Al Mousawi - One of the best experts on this subject based on the ideXlab platform.
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Zinc Tetraphenylporphyrin as High Performance Visible Light Photoinitiator of Cationic Photosensitive Resins for LED Projector 3D Printing Applications
Macromolecules, 2017Co-Authors: Assi Al Mousawi, Frédéric Dumur, Tayssir Hamieh, Joumana Toufaily, Cyril Poriel, Jean-pierre Fouassier, Jacques LalevéeAbstract:Zinc Tetraphenylporphyrin (ZnTPP) is proposed as a high performance visible light photoinitiator for both the free radical polymerization (FRP) of methacrylates (thick films) and the cationic polymerization (CP) of epoxides (thin films) upon visible light exposure using light emitting diodes (LEDs) at 405, 455, 477, and 530 nm. ZnTPP combined with an iodonium salt shows excellent polymerization initiating abilities and high final conversions were obtained. Remarkably, for the ligand alone (Tetraphenylporphyrin derivative, H2TPMP) used as photoinitiator, no polymerization occurs, indicating the importance of the metal in the initiating complex for an efficient process. A full picture of the involved chemical mechanisms is given. The high performance of ZnTPP as cationic initiating system is also well shown for new cationic 3D printing resins upon exposure to LED projector at 405 nm. © 2017 American Chemical Society.
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zinc Tetraphenylporphyrin as high performance visible light photoinitiator of cationic photosensitive resins for led projector 3d printing applications
Macromolecules, 2017Co-Authors: Assi Al Mousawi, Tayssir Hamieh, Frederic Dumu, Joumana Toufaily, Jeanpierre Fouassie, Cyril Poriel, Jacques LalevéeAbstract:Zinc Tetraphenylporphyrin (ZnTPP) is proposed as a high performance visible light photoinitiator for both the free radical polymerization (FRP) of methacrylates (thick films) and the cationic polymerization (CP) of epoxides (thin films) upon visible light exposure using light emitting diodes (LEDs) at 405, 455, 477, and 530 nm. ZnTPP combined with an iodonium salt shows excellent polymerization initiating abilities and high final conversions were obtained. Remarkably, for the ligand alone (Tetraphenylporphyrin derivative, H2TPMP) used as photoinitiator, no polymerization occurs, indicating the importance of the metal in the initiating complex for an efficient process. A full picture of the involved chemical mechanisms is given. The high performance of ZnTPP as cationic initiating system is also well shown for new cationic 3D printing resins upon exposure to LED projector at 405 nm.