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Related Concept Videos

Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than...
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To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Polymorphic phase transition among the titania crystal structures using a solution-based approach: from precursor

S Girish Kumar1, K S R Koteswara Rao

  • 1Department of Physics, Indian Institute of Science, Bangalore-560012, Karnataka, India. ksrkrao@physics.iisc.ernet.in raoksrk@gmail.com.

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|June 28, 2014
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Summary

This review explores low-temperature synthesis of nanocrystalline titania (TiO2) for green energy applications. It details wet chemical methods to control phase, size, and morphology, crucial for optimizing TiO2 properties.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Green Chemistry

Background:

  • Nanocrystalline titania (TiO2) offers non-toxicity, low cost, and excellent stability, making it ideal for functional applications, especially in green energy.
  • High-temperature synthesis methods often lead to undesirable particle growth and loss of nanostructural features.
  • Controlling TiO2 phase, particle size, and morphology at lower temperatures is key to enhancing its performance.

Purpose of the Study:

  • To review various solution-based methods for synthesizing crystalline titania at low to moderate temperatures.
  • To discuss how reaction parameters influence TiO2 polymorphs (anatase, rutile, brookite, TiO2(B)) and their structures.
  • To highlight future research directions and current knowledge gaps in titania synthesis.

Main Methods:

  • Discussion of hydrothermal/solvothermal, sol-gel, and sol-gel-assisted methods (ultrasonication, photoillumination, ionic liquids).
  • Analysis of thermolysis and microemulsion routes for TiO2 synthesis.
  • Examination of precursor chemistry, surfactants, solvents, pH, temperature, and other parameters influencing wet chemical synthesis.

Main Results:

  • Wet chemical methods allow precise tuning of TiO2 physical structure by manipulating multiple reaction parameters.
  • Detailed review of stabilization and phase transformation pathways for different titania polymorphs under various conditions.
  • Exploration of nucleation from diverse precursors including titanium halide/alkoxide, peroxo, and layered titanates.

Conclusions:

  • Low-temperature solution-based synthesis offers a promising route to tailor nanocrystalline titania for advanced applications.
  • Understanding crystallization driving forces and solution chemistry is crucial for controlling titania polymorph formation.
  • Further research is needed to address current limitations and unlock the full potential of titania in green energy.