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HomeKey Engineering MaterialsKey Engineering Materials Vol. 797Diffusion Coefficient and Interfacial Tension with...

Diffusion Coefficient and Interfacial Tension with Addition of Silica Nanoparticles in CO₂-Surfactant-Water-Hexane for Enhanced Oil Recovery (EOR) Using Molecular Dynamic Simulation

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Abstract:

Dynamic simulation for investigating the interactions of molecules that involved carbon dioxide (CO2), sodium dodecyl sulfate (SDS), water (H2O), hexane and silica nanoparticles (SiO2) in terms of diffusion coefficient and interfacial tension (IFT) were conducted at 298 K and 383 K for three different systems which consists of three layers (L1-L2-L3); CO₂-water-water/hexane (S1), CO₂-water/SDS-water/hexane (S2) and CO₂-water/SDS/SiO₂-water/hexane (S3). Analyses of the mean square displacement (MSD) showed that higher curve definition was obtained at 383 K than 298 K system, indicates higher mobility of the molecules. The diffusion coefficient of all CO₂, SiO₂, SDS and hexane molecules in all systems were higher at 383 K than 298 K due to heat supplied that energized the molecules and enhanced their diffusivity at the elevated temperature. The IFT between L1-L2 (I1) and L2-L3 (I2) determined from the pressure tensor data, decreased from 36.3 to 16.13 mN/m and 42.35 to 6.45 mN/m, respectively for S1 with the increment of temperature. Addition of SDS surfactant further decreased the I1 and I2 from 25.67 to 11.83 mN/m and 29.95 to 9.46 mN/m, respectively for S2 when the temperature increased. The IFT reduced significantly from 25.67 to 0.57 mN/m and 29.95 to 1.13 mN/m for I1 and I2, respectively at 298 K with addition of SiO₂ into SDS-Water i.e. S3. The addition of SiO₂ and SDS further reduced the interfacial tension due to the part taken by SiO2 and SDS in disrupting the closely linked hydrogen bond between water molecules at the interphase.

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Periodical:

Key Engineering Materials (Volume 797)

Pages:

375-384

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.797.375

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Online since:

March 2019

Authors:

Md Azmi Nik Salwani, Nor Roslina Rosli, Tengku Amran Tengku Mohd, Huey Ling Tan, Noor Fitrah Abu Bakar*

Keywords:

Diffusion Coefficient, Dynamic Simulation, Enhanced Oil Recovery (EOR), Interfacial Tension (IFT), Silica Nanoparticles, Sodium Dodecyl Sulfate (SDS)

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© 2019 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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