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Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices
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Visualizing and Quantifying Wettability Alteration by Silica Nanofluids.

Shidong Li1, Anqi Sng2, Dan Daniel2

  • 1Institute of Chemical and Engineering Sciences (ICES), Agency for Science, Technology and Research (A*STAR), 1, Pesek Road, Jurong Island, Singapore 627833.

ACS Applied Materials & Interfaces
|August 23, 2021
PubMed
Summary
This summary is machine-generated.

Silica nanoparticles in nanofluids make surfaces hydrophilic and oil-repellent, significantly reducing oil droplet adhesion. This wettability alteration enhances oil recovery by improving surface properties.

Keywords:
droplet probe atomic force microscopyenhanced oil recoverynanofluidreflection interference contrast microscopywettability alteration

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Area of Science:

  • Surface science
  • Nanotechnology
  • Materials science

Background:

  • Aqueous suspensions of silica nanoparticles (nanofluids) alter surface wettability, making them hydrophilic and oil-repellent.
  • This wettability alteration is crucial for applications like enhanced oil recovery and heat transfer.
  • Contact angle measurements are common but do not fully capture surface wettability changes.

Purpose of the Study:

  • To visualize and quantify wettability alterations by fumed silica nanoparticles using complementary techniques.
  • To investigate the mechanism behind wettability changes induced by silica nanoparticles.
  • To assess the impact of silica nanofluids on oil recovery rates.

Main Methods:

  • Cryo-scanning electron microscopy (cryo-SEM)
  • Confocal fluorescence and reflection interference contrast microscopy
  • Droplet probe atomic force microscopy (AFM)

Main Results:

  • Silica nanoparticles adsorbed onto glass surfaces, forming a porous layer with hierarchical micro- and nanostructures.
  • This porous layer trapped a thin water film, reducing oil droplet-substrate contact.
  • Nanoparticles reduced oil droplet adhesion force by over 400 times (from 210 ± 10 to 0.5 ± 0.3 nN).
  • Silica nanofluids increased oil recovery rates by 8% in a micromodel.

Conclusions:

  • Fumed silica nanoparticles effectively alter surface wettability by forming a nanostructured porous layer.
  • The trapped water film significantly reduces oil droplet adhesion, enhancing oil recovery.
  • Silica nanofluids show promise for improving efficiency in oil recovery processes.