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Jérôme Pauly - One of the best experts on this subject based on the ideXlab platform.
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High Pressure Solid-Liquid Equilibrium of Fatty Alcohols Binary Systems from 1-Dodecanol, 1-Tetradecanol, 1-Hexadecanol, and 1-Octadecanol
Journal of Chemical and Engineering Data, 2015Co-Authors: Natalia Dorighello Carareto, Antonio J. A. Meirelles, Mariana Costa,, Jérôme PaulyAbstract:The melting temperatures of four fatty alcohols, 1-dodecanol, 1-tetradecanol, 1-hexadecanol, and 1-octadecanol, were measured at atmospheric pressure using a μDSC calorimeter and at higher pressures (up to 80 MPa) thanks to a dedicated microscope. The solid-liquid phase diagrams of six binary mixtures formed by these fatty alcohols, namely, 1-dodecanol + 1-tetradecanol, 1-dodecanol + 1-hexadecanol, 1-dodecanol + 1-octadecanol, 1-tetradecanol + 1-hexadecanol, 1-tetradecanol + 1-octadecanol, and 1-hexadecanol + 1-octadecanol systems, were also measured using high pressure microscopy within the range of 0.1 MPa to 80 MPa. In addition, the phase diagrams of the 1-dodecanol + 1-tetradecanol, 1-tetradecanol + 1-hexadecanol, and 1-hexadecanol + 1-octadecanol systems were also measured by DSC in order to compare the results obtained from the microscopy. On the basis of the experimental data, it could be concluded that the behavior of the phase diagrams is slightly affected by the pressure, even within very large pressure ranges such as the ones studied in this work
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High Pressure Solid-Liquid Equilibrium of Fatty Alcohols Binary Systems from 1-Dodecanol, 1-Tetradecanol, 1-Hexadecanol, and 1-Octadecanol
Journal of Chemical & Engineering Data, 2015Co-Authors: Natália D.d. Carareto, Mariana C. Costa, Antonio J. A. Meirelles, Jérôme PaulyAbstract:The melting temperatures of four fatty alcohols, 1-dodecanol, 1-tetradecanol, 1-hexadecanol, and 1-octadecanol, were measured at atmospheric pressure using a μDSC calorimeter and at higher pressures (up to 80 MPa) thanks to a dedicated microscope. The solid–liquid phase diagrams of six binary mixtures formed by these fatty alcohols, namely, 1-dodecanol + 1-tetradecanol, 1-dodecanol + 1-hexadecanol, 1-dodecanol + 1-octadecanol, 1-tetradecanol + 1-hexadecanol, 1-tetradecanol + 1-octadecanol, and 1-hexadecanol + 1-octadecanol systems, were also measured using high pressure microscopy within the range of 0.1 MPa to 80 MPa. In addition, the phase diagrams of the 1-dodecanol + 1-tetradecanol, 1-tetradecanol + 1-hexadecanol, and 1-hexadecanol + 1-octadecanol systems were also measured by DSC in order to compare the results obtained from the microscopy. On the basis of the experimental data, it could be concluded that the behavior of the phase diagrams is slightly affected by the pressure, even within very large ...
Natalia Dorighello Carareto - One of the best experts on this subject based on the ideXlab platform.
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High Pressure Solid-Liquid Equilibrium of Fatty Alcohols Binary Systems from 1-Dodecanol, 1-Tetradecanol, 1-Hexadecanol, and 1-Octadecanol
Journal of Chemical and Engineering Data, 2015Co-Authors: Natalia Dorighello Carareto, Antonio J. A. Meirelles, Mariana Costa,, Jérôme PaulyAbstract:The melting temperatures of four fatty alcohols, 1-dodecanol, 1-tetradecanol, 1-hexadecanol, and 1-octadecanol, were measured at atmospheric pressure using a μDSC calorimeter and at higher pressures (up to 80 MPa) thanks to a dedicated microscope. The solid-liquid phase diagrams of six binary mixtures formed by these fatty alcohols, namely, 1-dodecanol + 1-tetradecanol, 1-dodecanol + 1-hexadecanol, 1-dodecanol + 1-octadecanol, 1-tetradecanol + 1-hexadecanol, 1-tetradecanol + 1-octadecanol, and 1-hexadecanol + 1-octadecanol systems, were also measured using high pressure microscopy within the range of 0.1 MPa to 80 MPa. In addition, the phase diagrams of the 1-dodecanol + 1-tetradecanol, 1-tetradecanol + 1-hexadecanol, and 1-hexadecanol + 1-octadecanol systems were also measured by DSC in order to compare the results obtained from the microscopy. On the basis of the experimental data, it could be concluded that the behavior of the phase diagrams is slightly affected by the pressure, even within very large pressure ranges such as the ones studied in this work
Antonio J. A. Meirelles - One of the best experts on this subject based on the ideXlab platform.
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High Pressure Solid-Liquid Equilibrium of Fatty Alcohols Binary Systems from 1-Dodecanol, 1-Tetradecanol, 1-Hexadecanol, and 1-Octadecanol
Journal of Chemical and Engineering Data, 2015Co-Authors: Natalia Dorighello Carareto, Antonio J. A. Meirelles, Mariana Costa,, Jérôme PaulyAbstract:The melting temperatures of four fatty alcohols, 1-dodecanol, 1-tetradecanol, 1-hexadecanol, and 1-octadecanol, were measured at atmospheric pressure using a μDSC calorimeter and at higher pressures (up to 80 MPa) thanks to a dedicated microscope. The solid-liquid phase diagrams of six binary mixtures formed by these fatty alcohols, namely, 1-dodecanol + 1-tetradecanol, 1-dodecanol + 1-hexadecanol, 1-dodecanol + 1-octadecanol, 1-tetradecanol + 1-hexadecanol, 1-tetradecanol + 1-octadecanol, and 1-hexadecanol + 1-octadecanol systems, were also measured using high pressure microscopy within the range of 0.1 MPa to 80 MPa. In addition, the phase diagrams of the 1-dodecanol + 1-tetradecanol, 1-tetradecanol + 1-hexadecanol, and 1-hexadecanol + 1-octadecanol systems were also measured by DSC in order to compare the results obtained from the microscopy. On the basis of the experimental data, it could be concluded that the behavior of the phase diagrams is slightly affected by the pressure, even within very large pressure ranges such as the ones studied in this work
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High Pressure Solid-Liquid Equilibrium of Fatty Alcohols Binary Systems from 1-Dodecanol, 1-Tetradecanol, 1-Hexadecanol, and 1-Octadecanol
Journal of Chemical & Engineering Data, 2015Co-Authors: Natália D.d. Carareto, Mariana C. Costa, Antonio J. A. Meirelles, Jérôme PaulyAbstract:The melting temperatures of four fatty alcohols, 1-dodecanol, 1-tetradecanol, 1-hexadecanol, and 1-octadecanol, were measured at atmospheric pressure using a μDSC calorimeter and at higher pressures (up to 80 MPa) thanks to a dedicated microscope. The solid–liquid phase diagrams of six binary mixtures formed by these fatty alcohols, namely, 1-dodecanol + 1-tetradecanol, 1-dodecanol + 1-hexadecanol, 1-dodecanol + 1-octadecanol, 1-tetradecanol + 1-hexadecanol, 1-tetradecanol + 1-octadecanol, and 1-hexadecanol + 1-octadecanol systems, were also measured using high pressure microscopy within the range of 0.1 MPa to 80 MPa. In addition, the phase diagrams of the 1-dodecanol + 1-tetradecanol, 1-tetradecanol + 1-hexadecanol, and 1-hexadecanol + 1-octadecanol systems were also measured by DSC in order to compare the results obtained from the microscopy. On the basis of the experimental data, it could be concluded that the behavior of the phase diagrams is slightly affected by the pressure, even within very large ...
Mariana Costa, - One of the best experts on this subject based on the ideXlab platform.
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High Pressure Solid-Liquid Equilibrium of Fatty Alcohols Binary Systems from 1-Dodecanol, 1-Tetradecanol, 1-Hexadecanol, and 1-Octadecanol
Journal of Chemical and Engineering Data, 2015Co-Authors: Natalia Dorighello Carareto, Antonio J. A. Meirelles, Mariana Costa,, Jérôme PaulyAbstract:The melting temperatures of four fatty alcohols, 1-dodecanol, 1-tetradecanol, 1-hexadecanol, and 1-octadecanol, were measured at atmospheric pressure using a μDSC calorimeter and at higher pressures (up to 80 MPa) thanks to a dedicated microscope. The solid-liquid phase diagrams of six binary mixtures formed by these fatty alcohols, namely, 1-dodecanol + 1-tetradecanol, 1-dodecanol + 1-hexadecanol, 1-dodecanol + 1-octadecanol, 1-tetradecanol + 1-hexadecanol, 1-tetradecanol + 1-octadecanol, and 1-hexadecanol + 1-octadecanol systems, were also measured using high pressure microscopy within the range of 0.1 MPa to 80 MPa. In addition, the phase diagrams of the 1-dodecanol + 1-tetradecanol, 1-tetradecanol + 1-hexadecanol, and 1-hexadecanol + 1-octadecanol systems were also measured by DSC in order to compare the results obtained from the microscopy. On the basis of the experimental data, it could be concluded that the behavior of the phase diagrams is slightly affected by the pressure, even within very large pressure ranges such as the ones studied in this work
Yoshiyuki Einaga - One of the best experts on this subject based on the ideXlab platform.
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Wormlike Micelles of Hexaoxyethylene Decyl C_10E_6 and Tetradecyl C_14E_6 Ethers Containing n-Dodecanol
Polymer Journal, 2007Co-Authors: Yoshiyuki Einaga, Megumi Ebihara, Ritsuko UchidaAbstract:Wormlike micelles formed with the surfactant hexaoxyethylene decyl C_10E_6 and tetradecyl C_14E_6 ethers were studied by static (SLS) and dynamic light scattering (DLS) experiments to examine variation of the micellar characteristics with uptake of n -dodecanol. The SLS results have been analyzed by the light scattering theory for micelle solutions to yield the molar mass M _ w ( c ) as a function of concentration c along with the cross-sectional diameter d of the micelle. The apparent hydrodynamic radius R _H,app( c ) determined by DLS as a function of c is also successfully analyzed by a fuzzy cylinder theory which takes into account the hydrodynamic and direct collision interactions among micelles, allowing us to evaluate the stiffness parameter λ^−1. It has been found that the micellar length increases with increasing surfactant weight fraction w _s or with raising temperature T irrespective of the composition of n -dodecanol content in the micelles. The length of the micelles at fixed w _s and T steeply increases with increasing weight fraction w _d of n -dodecanol. The length of the C_14E_6 micelles is extremely larger than that of the C_10E_6 micelles. The values of d and λ^−1 are found to increase with increasing w _d. It has been found that the increase in λ^−1 is more significant for the micelles of the surfactant molecules with shorter hydrophobic chain length.
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Characterization of Wormlike Pentaoxyethylene Dodecyl Ether C_12E_5 Micelles Containing n-Dodecanol
Polymer Journal, 2007Co-Authors: Maiko Miyake, Yoshiyuki EinagaAbstract:Variation of characteristics of the wormlike micelles formed with the surfactant pentaoxyethylene dodecyl ether C_12E_5 with uptake of n -dodecanol were examined by static (SLS) and dynamic light scattering (DLS) experiments. The SLS results have been analyzed with the aid of the light scattering theory for micelle solutions to yield the molar mass M _ w ( c ) as a function of concentration c along with the cross-sectional diameter d of the micelle. The apparent hydrodynamic radius R _H,app( c ) determined by DLS as a function of c is also successfully analyzed by a fuzzy cylinder theory which takes into account the hydrodynamic and direct collision interactions among micelles, allowing us to evaluate the stiffness parameter λ^−1. It has been found that the micellar length increases with increasing concentration c or with raising temperature T irrespective of the composition of the C_12E_5 + n -dodecanol system. The length of the micelles at fixed c and T steeply increases with increasing weight fraction w _d of n -dodecanol. The values of d and λ^−1 are found to increase with increasing w _d. On the other hand, the spacing s between the hydrophilic tails of adjacent surfactant molecules on the micellar surface decreased with w _d. It has been shown for the C_12E_5, C_10E_5, and C_12E_6 that the values d , s , and λ^−1 are substantially independent of the hydrophobic and hydrophilic chain length of the surfactant molecules.
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Characterization of Wormlike Pentaoxyethylene Dodecyl Ether C12E5 Micelles Containing n-Dodecanol
Polymer Journal, 2007Co-Authors: Maiko Miyake, Yoshiyuki EinagaAbstract:Characterization of Wormlike Pentaoxyethylene Dodecyl Ether C 12 E 5 Micelles Containing n -Dodecanol
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Wormlike Micelles of Hexaoxyethylene Decyl C10E6 and Tetradecyl C14E6 Ethers Containing n-Dodecanol
Polymer Journal, 2007Co-Authors: Yoshiyuki Einaga, Megumi Ebihara, Ritsuko UchidaAbstract:Wormlike micelles formed with the surfactant hexaoxyethylene decyl C10E6 and tetradecyl C14E6 ethers were studied by static (SLS) and dynamic light scattering (DLS) experiments to examine variation of the micellar characteristics with uptake of n-dodecanol. The SLS results have been analyzed by the light scattering theory for micelle solutions to yield the molar mass Mw(c) as a function of concentration c along with the cross-sectional diameter d of the micelle. The apparent hydrodynamic radius RH,app(c) determined by DLS as a function of c is also successfully analyzed by a fuzzy cylinder theory which takes into account the hydrodynamic and direct collision interactions among micelles, allowing us to evaluate the stiffness parameter λ−1. It has been found that the micellar length increases with increasing surfactant weight fraction ws or with raising temperature T irrespective of the composition of n-dodecanol content in the micelles. The length of the micelles at fixed ws and T steeply increases with increasing weight fraction wd of n-dodecanol. The length of the C14E6 micelles is extremely larger than that of the C10E6 micelles. The values of d and λ−1 are found to increase with increasing wd. It has been found that the increase in λ−1 is more significant for the micelles of the surfactant molecules with shorter hydrophobic chain length.
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Variation in Size and Shape of Hexaoxyethylene Dodecyl Ether C_12E_6 Micelles with Uptake of n-Dodecane and n-Dodecanol in Dilute Aqueous Solution
Polymer Journal, 2004Co-Authors: Yoshiyuki Einaga, Yukari Totake, Hiroko MatsuyamaAbstract:The size and shape of hexaoxyethylene dodecyl ether C_12E_6 micelles in dilute aqueous solutions with oil ( n -dodecane and n -dodecanol) uptake were investigated by static (SLS) and dynamic light scattering (DLS) experiments at 40.0 °C for the C_12E_6 + water + n -dodecane system and at 25.0 °C for the C_12E_6 + water + n -dodecanol system. The micelles collapse into the smaller ones by incorporating n -dodecane, implying that the incorporation of the oil weakens hydrophilic interactions among polyoxyethylene tail of the surfactant molecules and water too significantly to maintain the original micellar size. The inclusion of n -dodecanol causes growth in the micellar size, suggesting that n -dodecanol plays a role as a kind of co-surfactant. Accompanying size change, the micelles were found to alter their shape from the original wormlike shape to prolate ellipsoid with the oil uptake. The axial ratios determined are 17.4 and 9.2 for micelles containing n -dodecane and n -dodecanol, respectively. The volume allotted to each C_12E_6 molecule (including the oil) in the micelles does not vary much with oil content.