The Experts below are selected from a list of 12 Experts worldwide ranked by ideXlab platform
Eno E. Ebenso - One of the best experts on this subject based on the ideXlab platform.
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A New and Effective Macrocyclic Compound as corrosion inhibitor for mild Steel in Hydrochloric Acid Solution
2015Co-Authors: M. A. Quraishi, K. R Ansari, Eno E. EbensoAbstract:The inhibition characteristics of a Macrocylic Compound namely 1, 2, 4, 7, 9, 10-hexaazacyclo-pentadeca-10, 15-dien-3, 5, 6, 8-tetraone (HPTT) has been investigated on acid corrosion of mild steel in 1 M HCl using gravimetric measurement, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The maximum inhibition efficiency (η %) 95.2 % of HPTT was obtained at 200 mgL-1. Polarization curves indicate that HPTT acts as a mixed type inhibitor. The adsorption of inhibitor on mild steel surface followed Langmuir isotherm. Thermodynamic adsorption parameters such as adsorption heat (ΔHoads), adsorption entropy (ΔS o ads) and adsorption free energy (ΔG o ads) have been calculated and discussed
Flot D. - One of the best experts on this subject based on the ideXlab platform.
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Formation of crystalline macrocyclic phases during electrophilic precipitation-polycondensation syntheses of poly(arylene ether ketone)s
'Elsevier BV', 2004Co-Authors: Zolotukhin M.g., Colquhoun H.m., Sestiaa L.g., Williams D.j., Rueda D.r., Flot D.Abstract:Elongated crystalline particles formed as by-products during poly(arylene ether ketone) synthesis by electrophilic precipitation-polycondensation of 4,4'-diphenoxybenzophenone with terephthaloyl chloride or isophthaloyl chloride, thought previously to be polymer-whiskers, have now been identified as macrocyclic phases. Single crystal X-ray analysis of the needle-like particles formed in the reaction with terephthaloyl chloride, using the microdiffraction technique with synchrotron radiation, revealed that they consist of a Macrocylic Compound containing ten phenylene units, i.e. the [2 + 2] cyclic dimer. An analogous structure has also been demonstrated for the corresponding macrocycle derived from the reaction of 4,4-diphenoxybenzophenone with isophthaloyl chloride. Chloroform extraction of the products of the two polycondensations dissolved the macrocyclic material (but not the linear polymer), and analysis of the extracts by MALDI-TOF mass spectrometry demonstrated the presence in both cases of homologous families of macrocyclic products. Higher yields of macrocycles were obtained under pseudo-high dilution conditions, enabling the [2 + 2] cyclodimers from reactions of 4,4'-diphenoxybenzophenone with both terephthaloyl and isophthaloyl chloride to be isolated as pure Compounds and fully characterised. (C) 2003 Published by Elsevier Ltd
M. A. Quraishi - One of the best experts on this subject based on the ideXlab platform.
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A New and Effective Macrocyclic Compound as corrosion inhibitor for mild Steel in Hydrochloric Acid Solution
2015Co-Authors: M. A. Quraishi, K. R Ansari, Eno E. EbensoAbstract:The inhibition characteristics of a Macrocylic Compound namely 1, 2, 4, 7, 9, 10-hexaazacyclo-pentadeca-10, 15-dien-3, 5, 6, 8-tetraone (HPTT) has been investigated on acid corrosion of mild steel in 1 M HCl using gravimetric measurement, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The maximum inhibition efficiency (η %) 95.2 % of HPTT was obtained at 200 mgL-1. Polarization curves indicate that HPTT acts as a mixed type inhibitor. The adsorption of inhibitor on mild steel surface followed Langmuir isotherm. Thermodynamic adsorption parameters such as adsorption heat (ΔHoads), adsorption entropy (ΔS o ads) and adsorption free energy (ΔG o ads) have been calculated and discussed
Zolotukhin M.g. - One of the best experts on this subject based on the ideXlab platform.
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Formation of crystalline macrocyclic phases during electrophilic precipitation-polycondensation syntheses of poly(arylene ether ketone)s
'Elsevier BV', 2004Co-Authors: Zolotukhin M.g., Colquhoun H.m., Sestiaa L.g., Williams D.j., Rueda D.r., Flot D.Abstract:Elongated crystalline particles formed as by-products during poly(arylene ether ketone) synthesis by electrophilic precipitation-polycondensation of 4,4'-diphenoxybenzophenone with terephthaloyl chloride or isophthaloyl chloride, thought previously to be polymer-whiskers, have now been identified as macrocyclic phases. Single crystal X-ray analysis of the needle-like particles formed in the reaction with terephthaloyl chloride, using the microdiffraction technique with synchrotron radiation, revealed that they consist of a Macrocylic Compound containing ten phenylene units, i.e. the [2 + 2] cyclic dimer. An analogous structure has also been demonstrated for the corresponding macrocycle derived from the reaction of 4,4-diphenoxybenzophenone with isophthaloyl chloride. Chloroform extraction of the products of the two polycondensations dissolved the macrocyclic material (but not the linear polymer), and analysis of the extracts by MALDI-TOF mass spectrometry demonstrated the presence in both cases of homologous families of macrocyclic products. Higher yields of macrocycles were obtained under pseudo-high dilution conditions, enabling the [2 + 2] cyclodimers from reactions of 4,4'-diphenoxybenzophenone with both terephthaloyl and isophthaloyl chloride to be isolated as pure Compounds and fully characterised. (C) 2003 Published by Elsevier Ltd
K. R Ansari - One of the best experts on this subject based on the ideXlab platform.
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A New and Effective Macrocyclic Compound as corrosion inhibitor for mild Steel in Hydrochloric Acid Solution
2015Co-Authors: M. A. Quraishi, K. R Ansari, Eno E. EbensoAbstract:The inhibition characteristics of a Macrocylic Compound namely 1, 2, 4, 7, 9, 10-hexaazacyclo-pentadeca-10, 15-dien-3, 5, 6, 8-tetraone (HPTT) has been investigated on acid corrosion of mild steel in 1 M HCl using gravimetric measurement, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The maximum inhibition efficiency (η %) 95.2 % of HPTT was obtained at 200 mgL-1. Polarization curves indicate that HPTT acts as a mixed type inhibitor. The adsorption of inhibitor on mild steel surface followed Langmuir isotherm. Thermodynamic adsorption parameters such as adsorption heat (ΔHoads), adsorption entropy (ΔS o ads) and adsorption free energy (ΔG o ads) have been calculated and discussed
