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Dispersed Molecular Aggregates.

A. K. Panda1, S. P. Moulik, B. B. Bhowmik

  • 1Centre for Surface Science, Department of Chemistry, Jadavpur University, Calcutta, 700 032, India

Journal of Colloid and Interface Science
|March 20, 2001
PubMed
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Physicochemical Investigations on the Interaction of Surfactants and Salts with Polyvinylpyrrolidone in Aqueous Medium.

Journal of colloid and interface scienceยท2001
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Tungstic acid (H(2)WO(4)) colloidal dispersions were synthesized in microemulsions. Particle characteristics were analyzed, revealing insights into formation and properties within these unique media.

Area of Science:

  • Materials Science
  • Colloid Chemistry
  • Nanotechnology

Background:

  • Microemulsions offer unique environments for nanoparticle synthesis.
  • Controlling nanoparticle formation requires understanding interactions within these systems.

Purpose of the Study:

  • To synthesize colloidal dispersions of tungstic acid (H(2)WO(4)) in water-in-oil microemulsions.
  • To investigate the influence of various parameters on H(2)WO(4) formation and properties.
  • To characterize the synthesized tungstic acid particles.

Main Methods:

  • Synthesis via reaction of sodium tungstate (Na(2)WO(4)) with hydrochloric acid (HCl) in microemulsion media.
  • Dynamic light scattering (DLS) to study particle size and effects of parameters.
  • Fourier-transform infrared (FT-IR) spectroscopy to confirm H(2)WO(4) formation.

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  • Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) for particle morphology.
  • Microcalorimetry to determine the enthalpy of formation.

    • Main Results:

    • Successful preparation of tungstic acid (H(2)WO(4)) colloidal dispersions.
    • Established the formation of H(2)WO(4) within the microemulsion's water pool.
    • Characterized particle sizes and shapes using DLS, TEM, and SEM.
    • Analyzed the impact of alkanol chain length, TX-100/alkanol ratio, temperature, and dilution on particle formation.

    Conclusions:

    • Tungstic acid (H(2)WO(4)) can be effectively synthesized in water-in-oil microemulsion systems.
    • Microemulsion parameters significantly influence the characteristics of the resulting tungstic acid nanoparticles.
    • The study provides comprehensive data on the formation and properties of tungstic acid in confined microenvironments.