The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform

Hong Chen - One of the best experts on this subject based on the ideXlab platform.

  • the Interfacial Tension between cationic gemini surfactant solution and crude oil
    Journal of Surfactants and Detergents, 2009
    Co-Authors: Lijuan Han, Hong Chen, Pingya Luo
    Abstract:

    The effects of the hydrocarbon chains and spacer groups of gemini surfactants, salt, temperature, and polymer on the Interfacial Tension of crude oil–water mixtures were investigated in this paper. The length of the alkyl chain is a major factor affecting the properties of a gemini surfactant, and the spacer group is also an important factor influencing the surfactant properties. The addition of salt results in a great decrease in the CMC and favors the reduction of Interfacial Tension, which shows that a gemini surfactant has a good synergism with salt. Variation in temperature will affect the dynamic and equilibrium Interfacial Tension, and increasing the temperature can shorten the time to reach the equilibrium and decrease the equilibrium Interfacial Tension in the range of experimental temperatures. With the addition of polyacrylamide (PAM), it takes longer to reach equilibrium, but this has little effect on the value of equilibrium Interfacial Tension.

  • the effect of temperature on the Interfacial Tension between crude oil and gemini surfactant solution
    Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2008
    Co-Authors: Fuxiang Zhang, Lijuan Han, Pingya Luo, Jianjun Yang, Hong Chen
    Abstract:

    The effect of temperature on the Interfacial Tension between gemini surfactant solution and crude oil is investigated in this paper. The Interfacial Tension is measured by the spinning drop Interfacial Tension-meter of Texas-500c. For surfactants 14-4-14 and 16-4-16, the Interfacial Tensions are very sensitive to temperature and undergo minima with the increase of the temperature. Temperature has also an effect on the dynamic Interfacial Tension, i.e. increasing the temperature can shorten the time needed for an Interfacial Tension to reach equilibrium. However, for a mixing surfactant system, the effect of temperature on the Interfacial Tension between oil and surfactant solution is not remarkable because of synergism.

  • the Interfacial Tension between oil and gemini surfactant solution
    Surface Science, 2004
    Co-Authors: Hong Chen, Lijuan Han, Pingya Luo
    Abstract:

    Abstract The Interfacial Tensions between oil and solution of cationic gemini surfactants have been measured. It is found that gemini surfactants are more effective and efficient than corresponding conventional surfactants in reducing the Interfacial Tension and can lower the Tension of kerosene–water interface to ultra-low at very low concentration without other additives. It is also found that gemini surfactants can reduce the Interfacial Tension to ultra-low only at a certain concentration range. The addition of salt results in more effectiveness of surfactant in reducing the Tension of kerosene–water interface and shows that gemini surfactant has a good synergism with salt. For crude oil from Zhongyuan Oil Field of China, gemini surfactant is more effective on lowering crude oil–water Tension and has an excellent ability in reducing the Tension of crude oil–water interface. However, when the oil is hexadecane, ultra-low Interfacial Tension is not observed.

Pingya Luo - One of the best experts on this subject based on the ideXlab platform.

  • the Interfacial Tension between cationic gemini surfactant solution and crude oil
    Journal of Surfactants and Detergents, 2009
    Co-Authors: Lijuan Han, Hong Chen, Pingya Luo
    Abstract:

    The effects of the hydrocarbon chains and spacer groups of gemini surfactants, salt, temperature, and polymer on the Interfacial Tension of crude oil–water mixtures were investigated in this paper. The length of the alkyl chain is a major factor affecting the properties of a gemini surfactant, and the spacer group is also an important factor influencing the surfactant properties. The addition of salt results in a great decrease in the CMC and favors the reduction of Interfacial Tension, which shows that a gemini surfactant has a good synergism with salt. Variation in temperature will affect the dynamic and equilibrium Interfacial Tension, and increasing the temperature can shorten the time to reach the equilibrium and decrease the equilibrium Interfacial Tension in the range of experimental temperatures. With the addition of polyacrylamide (PAM), it takes longer to reach equilibrium, but this has little effect on the value of equilibrium Interfacial Tension.

  • the effect of temperature on the Interfacial Tension between crude oil and gemini surfactant solution
    Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2008
    Co-Authors: Fuxiang Zhang, Lijuan Han, Pingya Luo, Jianjun Yang, Hong Chen
    Abstract:

    The effect of temperature on the Interfacial Tension between gemini surfactant solution and crude oil is investigated in this paper. The Interfacial Tension is measured by the spinning drop Interfacial Tension-meter of Texas-500c. For surfactants 14-4-14 and 16-4-16, the Interfacial Tensions are very sensitive to temperature and undergo minima with the increase of the temperature. Temperature has also an effect on the dynamic Interfacial Tension, i.e. increasing the temperature can shorten the time needed for an Interfacial Tension to reach equilibrium. However, for a mixing surfactant system, the effect of temperature on the Interfacial Tension between oil and surfactant solution is not remarkable because of synergism.

  • the Interfacial Tension between oil and gemini surfactant solution
    Surface Science, 2004
    Co-Authors: Hong Chen, Lijuan Han, Pingya Luo
    Abstract:

    Abstract The Interfacial Tensions between oil and solution of cationic gemini surfactants have been measured. It is found that gemini surfactants are more effective and efficient than corresponding conventional surfactants in reducing the Interfacial Tension and can lower the Tension of kerosene–water interface to ultra-low at very low concentration without other additives. It is also found that gemini surfactants can reduce the Interfacial Tension to ultra-low only at a certain concentration range. The addition of salt results in more effectiveness of surfactant in reducing the Tension of kerosene–water interface and shows that gemini surfactant has a good synergism with salt. For crude oil from Zhongyuan Oil Field of China, gemini surfactant is more effective on lowering crude oil–water Tension and has an excellent ability in reducing the Tension of crude oil–water interface. However, when the oil is hexadecane, ultra-low Interfacial Tension is not observed.

Lijuan Han - One of the best experts on this subject based on the ideXlab platform.

  • the Interfacial Tension between cationic gemini surfactant solution and crude oil
    Journal of Surfactants and Detergents, 2009
    Co-Authors: Lijuan Han, Hong Chen, Pingya Luo
    Abstract:

    The effects of the hydrocarbon chains and spacer groups of gemini surfactants, salt, temperature, and polymer on the Interfacial Tension of crude oil–water mixtures were investigated in this paper. The length of the alkyl chain is a major factor affecting the properties of a gemini surfactant, and the spacer group is also an important factor influencing the surfactant properties. The addition of salt results in a great decrease in the CMC and favors the reduction of Interfacial Tension, which shows that a gemini surfactant has a good synergism with salt. Variation in temperature will affect the dynamic and equilibrium Interfacial Tension, and increasing the temperature can shorten the time to reach the equilibrium and decrease the equilibrium Interfacial Tension in the range of experimental temperatures. With the addition of polyacrylamide (PAM), it takes longer to reach equilibrium, but this has little effect on the value of equilibrium Interfacial Tension.

  • the effect of temperature on the Interfacial Tension between crude oil and gemini surfactant solution
    Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2008
    Co-Authors: Fuxiang Zhang, Lijuan Han, Pingya Luo, Jianjun Yang, Hong Chen
    Abstract:

    The effect of temperature on the Interfacial Tension between gemini surfactant solution and crude oil is investigated in this paper. The Interfacial Tension is measured by the spinning drop Interfacial Tension-meter of Texas-500c. For surfactants 14-4-14 and 16-4-16, the Interfacial Tensions are very sensitive to temperature and undergo minima with the increase of the temperature. Temperature has also an effect on the dynamic Interfacial Tension, i.e. increasing the temperature can shorten the time needed for an Interfacial Tension to reach equilibrium. However, for a mixing surfactant system, the effect of temperature on the Interfacial Tension between oil and surfactant solution is not remarkable because of synergism.

  • the Interfacial Tension between oil and gemini surfactant solution
    Surface Science, 2004
    Co-Authors: Hong Chen, Lijuan Han, Pingya Luo
    Abstract:

    Abstract The Interfacial Tensions between oil and solution of cationic gemini surfactants have been measured. It is found that gemini surfactants are more effective and efficient than corresponding conventional surfactants in reducing the Interfacial Tension and can lower the Tension of kerosene–water interface to ultra-low at very low concentration without other additives. It is also found that gemini surfactants can reduce the Interfacial Tension to ultra-low only at a certain concentration range. The addition of salt results in more effectiveness of surfactant in reducing the Tension of kerosene–water interface and shows that gemini surfactant has a good synergism with salt. For crude oil from Zhongyuan Oil Field of China, gemini surfactant is more effective on lowering crude oil–water Tension and has an excellent ability in reducing the Tension of crude oil–water interface. However, when the oil is hexadecane, ultra-low Interfacial Tension is not observed.

Fuxiang Zhang - One of the best experts on this subject based on the ideXlab platform.

  • the effect of temperature on the Interfacial Tension between crude oil and gemini surfactant solution
    Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2008
    Co-Authors: Fuxiang Zhang, Lijuan Han, Pingya Luo, Jianjun Yang, Hong Chen
    Abstract:

    The effect of temperature on the Interfacial Tension between gemini surfactant solution and crude oil is investigated in this paper. The Interfacial Tension is measured by the spinning drop Interfacial Tension-meter of Texas-500c. For surfactants 14-4-14 and 16-4-16, the Interfacial Tensions are very sensitive to temperature and undergo minima with the increase of the temperature. Temperature has also an effect on the dynamic Interfacial Tension, i.e. increasing the temperature can shorten the time needed for an Interfacial Tension to reach equilibrium. However, for a mixing surfactant system, the effect of temperature on the Interfacial Tension between oil and surfactant solution is not remarkable because of synergism.

Joseph D Berry - One of the best experts on this subject based on the ideXlab platform.

  • measurement of surface and Interfacial Tension using pendant drop tensiometry
    Journal of Colloid and Interface Science, 2015
    Co-Authors: Joseph D Berry, Michael J Neeson, Raymond R Dagastine, Derek Y C Chan, Richard Francis Tabor
    Abstract:

    Abstract Pendant drop tensiometry offers a simple and elegant solution to determining surface and Interfacial Tension – a central parameter in many colloidal systems including emulsions, foams and wetting phenomena. The technique involves the acquisition of a silhouette of an axisymmetric fluid droplet, and iterative fitting of the Young–Laplace equation that balances gravitational deformation of the drop with the restorative Interfacial Tension. Since the advent of high-quality digital cameras and desktop computers, this process has been automated with high speed and precision. However, despite its beguiling simplicity, there are complications and limitations that accompany pendant drop tensiometry connected with both Bond number (the balance between Interfacial Tension and gravitational forces) and drop volume. Here, we discuss the process involved with going from a captured experimental image to a fitted Interfacial Tension value, highlighting pertinent features and limitations along the way. We introduce a new parameter, the Worthington number, Wo, to characterise the measurement precision. A fully functional, open-source acquisition and fitting software is provided to enable the reader to test and develop the technique further.