The Experts below are selected from a list of 240 Experts worldwide ranked by ideXlab platform
Masahide Yamamoto - One of the best experts on this subject based on the ideXlab platform.
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preparation of the layer by layer deposited ultrathin film based on the Charge Transfer Interaction
Langmuir, 1997Co-Authors: Yuzuru Shimazaki, Masaya Mitsuishi, Masahide YamamotoAbstract:This paper is concerned with a novel layer-by-layer adsorption method for preparing multilayer assemblies of polymeric materials. We employed two kinds polymers, poly[2-(9-carbazolyl)ethyl methacrylate] and poly[2-[(3,5-dinitrobenzoyl)oxy]ethyl methacrylate], both bearing nonionic pendant groups in the side chains which have electron-donating character and electron-accepting character, respectively. These polymers were alternatively adsorbed onto the gold surface and the quartz substrates from the solutions in methylene chloride. The formation of this multilayer assembly is based on the Charge-Transfer (CT) Interaction between these groups at the solid−liquid interface and the films obtained have periodic layers of CT complexes. The successive increase of the thickness could be easily monitored by surface plasmon measurements. The thickness increment increased with the increase in the number of layers, and the increment became constant around the 10th layer, indicating that the total thickness of the film...
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preparation of the layer by layer deposited ultrathin film based on the Charge Transfer Interaction
Langmuir, 1997Co-Authors: Yuzuru Shimazaki, Masaya Mitsuishi, Shinzaburo Ito, Masahide YamamotoAbstract:This paper is concerned with a novel layer-by-layer adsorption method for preparing multilayer assemblies of polymeric materials. We employed two kinds polymers, poly[2-(9-carbazolyl)ethyl methacry...
Manal S. Elmasry - One of the best experts on this subject based on the ideXlab platform.
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multivariate analysis of tioconazole tcnq Charge Transfer Interaction kinetics thermodynamics and twofold response optimization
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2018Co-Authors: Manal S. Elmasry, Marwa S. Elazazy, Heba M ElsayedAbstract:Abstract Charge-Transfer complex (CTC) formation between tioconazole (TCZ) as an n-electron donor and 7, 7, 8, 8-tetracyanoquinodimethane (TCNQ) as a π-acceptor was studied spectrophotometrically with an accompanying kinetic and thermodynamic investigation. Multivariate data analysis via a set of experimental designs was executed for this purpose. A 23 - two-level full factorial design (FFD) was used for inspecting the proposed variables while a face-centered central composite design (FCCCD) was used to adjust the levels of variables proved to be significant. Two responses were quantified as a result of this Interaction; complex I (Y1, measured at 743 nm) and complex II (Y2, measured at 842 nm). Derringer's function and overlaid contour plots were used to concurrently optimize both responses. Benesi–Hildebrand equation was applied to determine of formation constant (K), and the molar absorptivity (Ɛ) of the formed complex. Different thermodynamic parameters; the standard Gibbs free energy change (∆G°), the standard enthalpy of formation (∆H°) and the standard entropy change (∆S°) were determined for the reaction product. The proposed method was validated regarding the linearity, intra-, and inter-day precision and accuracy, limit of detection, limit of quantification and following the ICH standards. The proposed method was also applied for the determination of TCZ in its pharmaceutical preparations. Having a higher molar absorptivity and higher formation constant, complex II was of choice for all subsequent measurements. Application of Benesi–Hildebrand equation supported the formation of 1: 1 CTC. Thermodynamic study revealed the endothermic characters and the spontaneity of formation of the CTC at high temperature.
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Multivariate analysis of tioconazole — TCNQ Charge Transfer Interaction: Kinetics, thermodynamics and twofold response optimization
Spectrochimica acta. Part A Molecular and biomolecular spectroscopy, 2018Co-Authors: Manal S. Elmasry, Marwa S. Elazazy, Heba M. El-sayedAbstract:Abstract Charge-Transfer complex (CTC) formation between tioconazole (TCZ) as an n-electron donor and 7, 7, 8, 8-tetracyanoquinodimethane (TCNQ) as a π-acceptor was studied spectrophotometrically with an accompanying kinetic and thermodynamic investigation. Multivariate data analysis via a set of experimental designs was executed for this purpose. A 23 - two-level full factorial design (FFD) was used for inspecting the proposed variables while a face-centered central composite design (FCCCD) was used to adjust the levels of variables proved to be significant. Two responses were quantified as a result of this Interaction; complex I (Y1, measured at 743 nm) and complex II (Y2, measured at 842 nm). Derringer's function and overlaid contour plots were used to concurrently optimize both responses. Benesi–Hildebrand equation was applied to determine of formation constant (K), and the molar absorptivity (Ɛ) of the formed complex. Different thermodynamic parameters; the standard Gibbs free energy change (∆G°), the standard enthalpy of formation (∆H°) and the standard entropy change (∆S°) were determined for the reaction product. The proposed method was validated regarding the linearity, intra-, and inter-day precision and accuracy, limit of detection, limit of quantification and following the ICH standards. The proposed method was also applied for the determination of TCZ in its pharmaceutical preparations. Having a higher molar absorptivity and higher formation constant, complex II was of choice for all subsequent measurements. Application of Benesi–Hildebrand equation supported the formation of 1: 1 CTC. Thermodynamic study revealed the endothermic characters and the spontaneity of formation of the CTC at high temperature.
Yuzuru Shimazaki - One of the best experts on this subject based on the ideXlab platform.
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preparation of the layer by layer deposited ultrathin film based on the Charge Transfer Interaction
Langmuir, 1997Co-Authors: Yuzuru Shimazaki, Masaya Mitsuishi, Masahide YamamotoAbstract:This paper is concerned with a novel layer-by-layer adsorption method for preparing multilayer assemblies of polymeric materials. We employed two kinds polymers, poly[2-(9-carbazolyl)ethyl methacrylate] and poly[2-[(3,5-dinitrobenzoyl)oxy]ethyl methacrylate], both bearing nonionic pendant groups in the side chains which have electron-donating character and electron-accepting character, respectively. These polymers were alternatively adsorbed onto the gold surface and the quartz substrates from the solutions in methylene chloride. The formation of this multilayer assembly is based on the Charge-Transfer (CT) Interaction between these groups at the solid−liquid interface and the films obtained have periodic layers of CT complexes. The successive increase of the thickness could be easily monitored by surface plasmon measurements. The thickness increment increased with the increase in the number of layers, and the increment became constant around the 10th layer, indicating that the total thickness of the film...
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preparation of the layer by layer deposited ultrathin film based on the Charge Transfer Interaction
Langmuir, 1997Co-Authors: Yuzuru Shimazaki, Masaya Mitsuishi, Shinzaburo Ito, Masahide YamamotoAbstract:This paper is concerned with a novel layer-by-layer adsorption method for preparing multilayer assemblies of polymeric materials. We employed two kinds polymers, poly[2-(9-carbazolyl)ethyl methacry...
Heba M Elsayed - One of the best experts on this subject based on the ideXlab platform.
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multivariate analysis of tioconazole tcnq Charge Transfer Interaction kinetics thermodynamics and twofold response optimization
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2018Co-Authors: Manal S. Elmasry, Marwa S. Elazazy, Heba M ElsayedAbstract:Abstract Charge-Transfer complex (CTC) formation between tioconazole (TCZ) as an n-electron donor and 7, 7, 8, 8-tetracyanoquinodimethane (TCNQ) as a π-acceptor was studied spectrophotometrically with an accompanying kinetic and thermodynamic investigation. Multivariate data analysis via a set of experimental designs was executed for this purpose. A 23 - two-level full factorial design (FFD) was used for inspecting the proposed variables while a face-centered central composite design (FCCCD) was used to adjust the levels of variables proved to be significant. Two responses were quantified as a result of this Interaction; complex I (Y1, measured at 743 nm) and complex II (Y2, measured at 842 nm). Derringer's function and overlaid contour plots were used to concurrently optimize both responses. Benesi–Hildebrand equation was applied to determine of formation constant (K), and the molar absorptivity (Ɛ) of the formed complex. Different thermodynamic parameters; the standard Gibbs free energy change (∆G°), the standard enthalpy of formation (∆H°) and the standard entropy change (∆S°) were determined for the reaction product. The proposed method was validated regarding the linearity, intra-, and inter-day precision and accuracy, limit of detection, limit of quantification and following the ICH standards. The proposed method was also applied for the determination of TCZ in its pharmaceutical preparations. Having a higher molar absorptivity and higher formation constant, complex II was of choice for all subsequent measurements. Application of Benesi–Hildebrand equation supported the formation of 1: 1 CTC. Thermodynamic study revealed the endothermic characters and the spontaneity of formation of the CTC at high temperature.
Heba M. El-sayed - One of the best experts on this subject based on the ideXlab platform.
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Multivariate analysis of tioconazole — TCNQ Charge Transfer Interaction: Kinetics, thermodynamics and twofold response optimization
Spectrochimica acta. Part A Molecular and biomolecular spectroscopy, 2018Co-Authors: Manal S. Elmasry, Marwa S. Elazazy, Heba M. El-sayedAbstract:Abstract Charge-Transfer complex (CTC) formation between tioconazole (TCZ) as an n-electron donor and 7, 7, 8, 8-tetracyanoquinodimethane (TCNQ) as a π-acceptor was studied spectrophotometrically with an accompanying kinetic and thermodynamic investigation. Multivariate data analysis via a set of experimental designs was executed for this purpose. A 23 - two-level full factorial design (FFD) was used for inspecting the proposed variables while a face-centered central composite design (FCCCD) was used to adjust the levels of variables proved to be significant. Two responses were quantified as a result of this Interaction; complex I (Y1, measured at 743 nm) and complex II (Y2, measured at 842 nm). Derringer's function and overlaid contour plots were used to concurrently optimize both responses. Benesi–Hildebrand equation was applied to determine of formation constant (K), and the molar absorptivity (Ɛ) of the formed complex. Different thermodynamic parameters; the standard Gibbs free energy change (∆G°), the standard enthalpy of formation (∆H°) and the standard entropy change (∆S°) were determined for the reaction product. The proposed method was validated regarding the linearity, intra-, and inter-day precision and accuracy, limit of detection, limit of quantification and following the ICH standards. The proposed method was also applied for the determination of TCZ in its pharmaceutical preparations. Having a higher molar absorptivity and higher formation constant, complex II was of choice for all subsequent measurements. Application of Benesi–Hildebrand equation supported the formation of 1: 1 CTC. Thermodynamic study revealed the endothermic characters and the spontaneity of formation of the CTC at high temperature.