One-Step Synthesis and Functionalization of High-Salinity-Tolerant Magnetite Nanoparticles with Sulfonated Phenolic...

Area of Science:

• Materials Science
• Nanotechnology
• Petroleum Engineering

Background:

• Superparamagnetic nanoparticles are crucial for oil field applications.
• Nanoparticle dispersion stability is challenged by harsh subsurface conditions (high salinity, high temperature).

Purpose of the Study:

• To develop stable superparamagnetic nanoparticle dispersions for demanding oil field environments.
• To functionalize magnetite nanoparticles with sulfonated phenolic resin for enhanced stability.

Main Methods:

• Synthesized sulfonated phenolic resin via heating 4-hydroxybenzenesulfonic acid and formaldehyde.
• Achieved one-pot synthesis/surface functionalization of magnetite nanoparticles via co-precipitation in resin solution.
• Characterized nanoparticles using size distribution, TGA, zeta potential, TEM, and EDX.

Main Results:

• Stable dispersions of functionalized magnetite nanoparticles in 5 wt% NaCl solution were achieved at neutral to basic pH.
• Sulfonated phenolic resin provided electrostatic repulsion in high salinity due to anionic sulfonate groups.
• Demonstrated superparamagnetism of the nanoparticles through Langevin curve analysis.

Conclusions:

• Surface functionalization with sulfonated phenolic resin effectively enhances nanoparticle stability in harsh oil field conditions.
• The one-pot synthesis method simplifies production and offers potential cost reduction.
• The developed nanoparticles show promise for various oil field applications requiring stable magnetic dispersions.