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Nanostructured Amorphous Silicas Hydrophobized by Various Pathways.

Iryna S Protsak1,2, Volodymyr M Gun'ko3, Ian M Henderson4

  • 1College of Environment, Zhejiang University of Technology, Hangzhou 310014, China.

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This study modified amorphous silicas with polydimethylsiloxanes (PDMS) using dimethyl carbonate (DMC). Optimal modification depends on silica structure, PDMS viscosity, and reaction conditions for improved nanoparticle dispersion.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Nanostructured amorphous silicas are crucial materials with diverse applications.
  • Controlling silica surface properties is key to enhancing their performance in composites.
  • Polydimethylsiloxanes (PDMS) offer tunable properties for surface modification.

Purpose of the Study:

  • To investigate the modification of various amorphous silicas with different polydimethylsiloxanes (PDMS).
  • To explore the role of dimethyl carbonate (DMC) and reaction conditions in the grafting process.
  • To understand how modification affects the morphological, textural, and structural characteristics of silica-PDMS nanocomposites.

Main Methods:

  • Silica modification using PDMS of varying viscosities and dimethyl carbonate (DMC).
  • Characterization via microscopy, spectroscopy (IR, NMR), thermodesorption, gas adsorption, SAXS, and zeta-potential.
  • Analysis of nanoparticle organization (NPNP, ANPNP) and reaction temperature (Tr).

Main Results:

  • Silica modification is highly dependent on PDMS type/content, silica structure, and reaction temperature.
  • Agglomerated aggregates (ANPNP) with macro/mesoporous character favor modification with short PDMS (no DMC, high Tr) or long PDMS (with DMC, low Tr).
  • PDMS/DMC modification yields stable, dispersed nanoparticles, preventing secondary structure compaction.

Conclusions:

  • Effective silica modification requires careful selection of PDMS, silica morphology, and reaction parameters.
  • The PDMS/DMC method offers a promising route for creating well-dispersed modified silica nanoparticles.
  • Improved dispersion enhances the compatibility and performance of modified silicas in various matrices.