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September 2, 2026Scientific ReportsOpen Access

Magnetophoretically driven demulsification of oil-in-water emulsions

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Authors

JMJuan Manuel Magaña-PiñaLELuis Alberto Estudillo‐WongRJRaciel Jaimes

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Overview

Experimental investigation demonstrates rapid 98% hydrocarbon removal from oil-in-water emulsions using magnetic nanoparticles, highlighting sand-derived iron oxides as effective recyclable...

Key Points

  • To evaluate the demulsification performance and reusability of surfactant-functionalized magnetic nanoparticles synthesized from commercial iron salts versus natural iron-rich sand.
  • Synthesized SDBS-functionalized magnetic nanoparticles via chemical coprecipitation of commercial iron salts (SMNPs) and Fe-rich natural sand (NMNPs).
  • Applied magnetic-field gradients to 5% v/v oil-in-water emulsions (27° API) treated with pristine and thermally recovered nanoparticles at 2500 ppm, evaluating separation over time against particle-free controls.
  • Conducted structural, magnetic, optical, microstructural, and elemental analyses across pristine, functionalized, and recovered nanoparticle states.
  • Both salt-derived and sand-derived nanoparticles achieved 98% hydrocarbon removal at 2500 ppm within 1 min under a magnetic-field gradient.
  • Control mixtures without nanoparticles or magnetic fields showed zero precipitation or phase separation after 10 days.
  • Thermally recovered nanoparticles retained high separation efficiency, with sand-derived particles consisting predominantly of magnetite (Fe3O4) and salt-derived particles consisting of maghemite (γ-Fe2O3).

Cite This Study

Magaña-Piña et al. (2026) studied this question.

synapsesocial.com/papers/6a97e2d9c562ede874ec7333https://doi.org/10.1038/s41598-026-67541-7
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