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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
The Colloidal State01:29

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...

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Synthesis and Reaction Chemistry of Nanosize Monosodium Titanate
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Colloidal TiO2 nanocrystals prepared from peroxotitanium complex solutions: phase evolution from different

Sang Il Seok1, Muga Vithal, Jeong Ah Chang

  • 1KRICT-EPFL Global Research Laboratory, Advanced Materials Division, Korea Research Institute of Chemical Technology, 19 Sinseongno, Yuseong, Daejeon 305-600, Republic of Korea. seoksi@krict.re.kr

Journal of Colloid and Interface Science
|March 16, 2010
PubMed
Summary

Researchers synthesized nanocrystalline titanium dioxide (TiO2) using aqueous peroxotitanium complex (PTC) solutions. Precursor choice and solution pH critically influence whether anatase or rutile TiO2 phases form.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Inorganic Chemistry

Background:

  • Titanium dioxide (TiO2) is a crucial material with applications in catalysis, energy, and environmental remediation.
  • Controlling the crystalline phase (anatase, rutile, brookite) of TiO2 is essential for optimizing its properties.
  • Aqueous peroxotitanium complex (PTC) solutions offer a promising route for TiO2 synthesis.

Purpose of the Study:

  • To investigate the synthesis of nanocrystalline anatase and rutile TiO2 from aqueous PTC solutions.
  • To understand the influence of different titanium precursors (TiCl4 and TTIP) on TiO2 phase evolution.
  • To elucidate the role of solution environment, particularly pH, in determining the final TiO2 crystal structure.

Main Methods:

  • Preparation of TiO2 via aqueous peroxotitanium complex (PTC) solutions.
  • Characterization using powder X-ray diffraction (XRD).
  • Spectroscopic analysis including infrared (IR) and Raman spectroscopy.

Main Results:

  • Phase-pure nanoanatase TiO2 was obtained from PTC solutions derived from TiCl4.
  • A mixture of anatase and rutile TiO2 was produced from PTC solutions derived from titanium tetraisopropoxide (TTIP).
  • Calcining PTC powders in air yielded pure anatase TiO2 irrespective of the precursor.

Conclusions:

  • The choice of titanium precursor significantly impacts the phase composition of TiO2 synthesized from PTC solutions.
  • Solution pH and the formation of hydrated TiO6 units or TiO2·xH2O are critical factors governing TiO2 crystallization.
  • Controlled synthesis of specific TiO2 phases can be achieved by manipulating reaction conditions and precursor chemistry.