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A. Adriaens - One of the best experts on this subject based on the ideXlab platform.
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in situ spectroelectrochemical characterization of the electrochemical growth and breakdown of a lead Dodecanoate coating on a lead substrate
Talanta, 2015Co-Authors: Michel De Keersmaecker, M G Dowsett, Rosie Grayburn, Dipanjan Banerjee, A. AdriaensAbstract:This paper concerns a time lapse spectroelectrochemical study of the growth of lead Dodecanoate layers on a lead substrate in an aqueous solution using cyclic voltammetry. In-situ synchrotron radiation X-ray diffraction measurements were carried out on station BM26A (DUBBLE) at the European Synchrotron Radiation Facility (ESRF) in France. The diffraction pattern images were taken using a two-dimensional Mar CCD camera. After deposition of the coating, a spectroelectrochemical study of a linear sweep voltammetry experiment using an acetic acid electrolyte, simulating 'active' lead corrosion, was carried out on both a bare and lead Dodecanoate coated sample. The results show that the coating inhibits the formation of new lead corrosion products.
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lead Dodecanoate coatings for the protection of lead and lead tin alloy artifacts two examples
Applied Surface Science, 2014Co-Authors: Michel De Keersmaecker, Kim Verbeken, A. AdriaensAbstract:Abstract In order to understand the corrosive and morphological characteristics of lead Dodecanoate protective coatings on real samples, three pipe organ samples were studied using optical microscopy (OM), scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and electrochemical impedance spectroscopy (EIS). The corrosion products and elemental composition of the top layer of the different pipe organ samples were investigated. The results indicate that the three pipe organ samples are made of an alloy composed mainly of lead and tin. After immersion and the deposition of the protective coating, only lead and no tin is detected, which indicates the formation of a thick coating containing lead Dodecanoate complexes.
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Influence of the deposition method, temperature and deposition time on the corrosion inhibition of lead Dodecanoate coatings deposited on lead surfaces
Journal of Solid State Electrochemistry, 2013Co-Authors: M. Keersmaecker, K. Wael, A. AdriaensAbstract:Electrochemical impedance measurements have been used to investigate the influence of the deposition method, including time and temperature, upon the corrosion inhibition characteristics of lead Dodecanoate coatings on lead electrodes. The results were analysed using multivariate statistics and show that, in general, these easily prepared coatings are very protective against corrosion. The temperature proves to be an important parameter for the quality and the corrosion inhibition efficiency of the coating. A comparison between two different electrochemically assisted deposition methods, immersion using a reduction pretreatment and cyclic voltammetry, does not show significant differences. Using the immersion technique at room temperature, the deposition time was tested as the third influencing parameter for the corrosion inhibition efficiency of the deposited lead Dodecanoate coatings. A longer deposition time of the lead into the sodium Dodecanoate solution provides a layer with a somewhat higher corrosion resistance.
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the use of lead Dodecanoate as an environmentally friendly coating to inhibit the corrosion of lead objects comparison of three different deposition methods
Progress in Organic Coatings, 2012Co-Authors: Michel De Keersmaecker, K. Wael, A. AdriaensAbstract:Abstract An aqueous sodium Dodecanoate solution has been used for the formation of a protective coating for lead. Three deposition methods have been compared: immobilization using cyclic voltammetry, immersion and amperometry. Apart from this, we tested a reduction pretreatment of the lead surface (−1.5 V during 600 s) in order to obtain a more reproducible coating, resulting in a better corrosion protection behavior. The corrosion inhibition properties were examined using potentiodynamic polarization curves and electrochemical impedance measurements in a standard corrosive environment.
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electrochemical deposition of Dodecanoate on lead in view of an environmentally safe corrosion inhibition
Journal of Solid State Electrochemistry, 2010Co-Authors: K. Wael, Michel De Keersmaecker, M G Dowsett, David Walker, Pam A Thomas, A. AdriaensAbstract:Non-toxic linear sodium monocarboxylates can be successfully used as inhibitors for the corrosion of many metals. The adsorption of these molecules onto a metal is usually achieved by immersing the metal in the carboxylate solution for a few hours. This paper describes the strength of cyclic voltammetry in forming a sodium Dodecanoate coating on a lead electrode. We show that this approach is much less time-consuming compared with the immersion method and enables one to control and to characterize the layer formed by following the potential and current during the process. Additional ATR-IR and X-ray diffraction spectroscopic analyses were performed to qualitatively characterize the newly formed coating.
Jacques Jose - One of the best experts on this subject based on the ideXlab platform.
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isothermal vapor pressures of three binary systems n tetradecane methyl Dodecanoate methyl tetradecanoate or methyl hexadecanoate between 353 15 and 453 15 k
Journal of Chemical & Engineering Data, 2017Co-Authors: Kamel Khimeche, Ilham Mokbel, Lakhdar Sahraoui, Mokhtar Benziane, Jacques JoseAbstract:Isothermal vapor pressures of three binary systems, methyl Dodecanoate (1) + n-tetradecane (2); methyl tetradecanoate (1) + n-tetradecane (2); and methyl hexadecanoate (1) + n-tetradecane (2), were measured by means of a static apparatus at temperatures between 353.15 and 453.15 K. The data of the pure components were correlated by the Antoine equation. A maximum azeotropic behavior is observed for the binary mixture, methyl Dodecanoate (1) + n-tetradecane (2). The molar excess Gibbs energies GE were deduced from Barker’s method by fitting the experimental points through Redlich–Kister equation. The NRTL and UNIQUAC models were applied to regress the experimental vapor liquid equilibrium (VLE). The investigated systems were successfully represented by the two models.
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experimental vapor pressures from 1 pa to 100 kpa of six saturated fatty acid methyl esters fames methyl hexanoate methyl octanoate methyl decanoate methyl Dodecanoate methyl tetradecanoate and methyl hexadecanoate
The Journal of Chemical Thermodynamics, 2016Co-Authors: Kamel Khimeche, Ilham Mokbel, Abdallah Dahmani, Lakhda Sahraoui, Jacques JoseAbstract:Abstract Vapor pressures of six saturated Fatty Acid Methyl Esters (FAMEs), methyl hexanoate (or methyl caproate), methyl octanoate (or methyl caprylate), Methyl decanoate (or methyl caprate), methyl Dodecanoate (or methyl laurate), methyl tetradecanoate (or methyl myristate), and methyl hexadecanoate (or methyl palmitate) were measured from 1 Pa to 100 kPa and at temperature range between 262 and 453 K using a static apparatus. The experimental data (P-T) were compared with the available literature data.
Ilham Mokbel - One of the best experts on this subject based on the ideXlab platform.
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isothermal vapor pressures of three binary systems n tetradecane methyl Dodecanoate methyl tetradecanoate or methyl hexadecanoate between 353 15 and 453 15 k
Journal of Chemical & Engineering Data, 2017Co-Authors: Kamel Khimeche, Ilham Mokbel, Lakhdar Sahraoui, Mokhtar Benziane, Jacques JoseAbstract:Isothermal vapor pressures of three binary systems, methyl Dodecanoate (1) + n-tetradecane (2); methyl tetradecanoate (1) + n-tetradecane (2); and methyl hexadecanoate (1) + n-tetradecane (2), were measured by means of a static apparatus at temperatures between 353.15 and 453.15 K. The data of the pure components were correlated by the Antoine equation. A maximum azeotropic behavior is observed for the binary mixture, methyl Dodecanoate (1) + n-tetradecane (2). The molar excess Gibbs energies GE were deduced from Barker’s method by fitting the experimental points through Redlich–Kister equation. The NRTL and UNIQUAC models were applied to regress the experimental vapor liquid equilibrium (VLE). The investigated systems were successfully represented by the two models.
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experimental vapor pressures from 1 pa to 100 kpa of six saturated fatty acid methyl esters fames methyl hexanoate methyl octanoate methyl decanoate methyl Dodecanoate methyl tetradecanoate and methyl hexadecanoate
The Journal of Chemical Thermodynamics, 2016Co-Authors: Kamel Khimeche, Ilham Mokbel, Abdallah Dahmani, Lakhda Sahraoui, Jacques JoseAbstract:Abstract Vapor pressures of six saturated Fatty Acid Methyl Esters (FAMEs), methyl hexanoate (or methyl caproate), methyl octanoate (or methyl caprylate), Methyl decanoate (or methyl caprate), methyl Dodecanoate (or methyl laurate), methyl tetradecanoate (or methyl myristate), and methyl hexadecanoate (or methyl palmitate) were measured from 1 Pa to 100 kPa and at temperature range between 262 and 453 K using a static apparatus. The experimental data (P-T) were compared with the available literature data.
Michel De Keersmaecker - One of the best experts on this subject based on the ideXlab platform.
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C126 Journal of The Electrochemical Society, 161 (3) C126-C137 (2014) 0013-4651/2014/161(3)/C126/12/$31.00 © The Electrochemical Society Electrochemical and Surface Study of Neutralized Dodecanoic Acid on a Lead Substrate
2016Co-Authors: Michel De Keersmaecker, Diederik A Depla, Kim B Verbeken, Annemie AdriaensaAbstract:Polarization and impedance measurements in a corrosive environment have been used to investigate the adsorption and corrosion inhibition characteristics of sodium Dodecanoate on lead. Results show that the concentration of sodium Dodecanoate has an important effect on the anodic lead dissolution. Monolayer adsorption occurs at low inhibitor concentrations. The equilibrium constant (Kads), calculated using the Frumkin model, is about 10−5 M−1. Multilayer formation at concentrations above the critical micelle concentration ensures the formation of a lead Dodecanoate coating following the dissolution-precipitation mechanism. These lead complexes are formed on top of the surface, which has been confirmed by secondary electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) and X-ray photoelectron spectroscopy (XPS)
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in situ spectroelectrochemical characterization of the electrochemical growth and breakdown of a lead Dodecanoate coating on a lead substrate
Talanta, 2015Co-Authors: Michel De Keersmaecker, M G Dowsett, Rosie Grayburn, Dipanjan Banerjee, A. AdriaensAbstract:This paper concerns a time lapse spectroelectrochemical study of the growth of lead Dodecanoate layers on a lead substrate in an aqueous solution using cyclic voltammetry. In-situ synchrotron radiation X-ray diffraction measurements were carried out on station BM26A (DUBBLE) at the European Synchrotron Radiation Facility (ESRF) in France. The diffraction pattern images were taken using a two-dimensional Mar CCD camera. After deposition of the coating, a spectroelectrochemical study of a linear sweep voltammetry experiment using an acetic acid electrolyte, simulating 'active' lead corrosion, was carried out on both a bare and lead Dodecanoate coated sample. The results show that the coating inhibits the formation of new lead corrosion products.
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lead Dodecanoate coatings for the protection of lead and lead tin alloy artifacts two examples
Applied Surface Science, 2014Co-Authors: Michel De Keersmaecker, Kim Verbeken, A. AdriaensAbstract:Abstract In order to understand the corrosive and morphological characteristics of lead Dodecanoate protective coatings on real samples, three pipe organ samples were studied using optical microscopy (OM), scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and electrochemical impedance spectroscopy (EIS). The corrosion products and elemental composition of the top layer of the different pipe organ samples were investigated. The results indicate that the three pipe organ samples are made of an alloy composed mainly of lead and tin. After immersion and the deposition of the protective coating, only lead and no tin is detected, which indicates the formation of a thick coating containing lead Dodecanoate complexes.
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the use of lead Dodecanoate as an environmentally friendly coating to inhibit the corrosion of lead objects comparison of three different deposition methods
Progress in Organic Coatings, 2012Co-Authors: Michel De Keersmaecker, K. Wael, A. AdriaensAbstract:Abstract An aqueous sodium Dodecanoate solution has been used for the formation of a protective coating for lead. Three deposition methods have been compared: immobilization using cyclic voltammetry, immersion and amperometry. Apart from this, we tested a reduction pretreatment of the lead surface (−1.5 V during 600 s) in order to obtain a more reproducible coating, resulting in a better corrosion protection behavior. The corrosion inhibition properties were examined using potentiodynamic polarization curves and electrochemical impedance measurements in a standard corrosive environment.
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electrochemical deposition of Dodecanoate on lead in view of an environmentally safe corrosion inhibition
Journal of Solid State Electrochemistry, 2010Co-Authors: K. Wael, Michel De Keersmaecker, M G Dowsett, David Walker, Pam A Thomas, A. AdriaensAbstract:Non-toxic linear sodium monocarboxylates can be successfully used as inhibitors for the corrosion of many metals. The adsorption of these molecules onto a metal is usually achieved by immersing the metal in the carboxylate solution for a few hours. This paper describes the strength of cyclic voltammetry in forming a sodium Dodecanoate coating on a lead electrode. We show that this approach is much less time-consuming compared with the immersion method and enables one to control and to characterize the layer formed by following the potential and current during the process. Additional ATR-IR and X-ray diffraction spectroscopic analyses were performed to qualitatively characterize the newly formed coating.
Xiangyang Liu - One of the best experts on this subject based on the ideXlab platform.
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experimental and correlational study of isobaric molar heat capacities of fatty acid esters ethyl nonanoate and ethyl Dodecanoate
Fluid Phase Equilibria, 2019Co-Authors: Xiangyang Liu, Chenyang Zhu, Feng YangAbstract:Abstract An experimental study on the isobaric molar heat capacities of ethyl nonanoate and ethyl Dodecanoate was performed at temperatures between 303 K and 393 K and at pressures between 0.1 MPa and 25.2 MPa. An increase of isobaric molar heat capacity with temperature increase was observed, and temperature was found to have a greater effect on isobaric molar heat capacity than pressure. Then the isobaric molar heat capacity data of 18 saturated fatty acid methyl and ethyl esters in literature were selected, to get a general correlation for the isobaric molar heat capacity of saturated fatty acid alkyl esters. The average absolute relative deviation and the maximum deviation of the present correlation from experimental data are lower than 0.70% and 3.82%, respectively. At last, to test the predictive ability of the proposed correlation, the heat capacities of ethyl nonanoate and ethyl Dodecanoate were calculated. The average absolute relative deviation and the maximum deviation from our experimental results are 0.88% and 2.10%, respectively.
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densities and viscosities of mixtures of methyl Dodecanoate ethyl octanoate at pressures up to 15 mpa
Journal of Chemical & Engineering Data, 2018Co-Authors: Xiangyang Liu, Feng Yang, Tianwang Lai, Chenyang ZhuAbstract:Blending methyl ester biodiesel and ethyl ester biodiesel can improve the properties of biodiesel. The densities and viscosities of the mixtures of methyl Dodecanoate plus ethyl octanoate with vari...
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measurement and correlation of viscosities and densities of methyl Dodecanoate and ethyl Dodecanoate at elevated pressures
Thermochimica Acta, 2018Co-Authors: Tianwang Lai, Xiangyang LiuAbstract:Abstract The density and viscosity data of two biodiesel components methyl Dodecanoate and ethyl Dodecanoate over the temperature range from (302–354) K and at pressures up to 15.2 MPa were reported. Experimental results show that the densities and viscosities of methyl Dodecanoate and ethyl Dodecanoate increase with the increase of pressure and decrease with the increase of temperature. The densities and viscosities of different fatty acid methyl esters and fatty acid ethyl esters were compared to investigate the effect of carbon number. Tait equation and Andrade-Tait model were used to model the measured densities and viscosities of methyl Dodecanoate and ethyl Dodecanoate.