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Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

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Related Experiment Video

Updated: Apr 19, 2026

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

BaTiO3 supercages: unusual oriented nanoparticle aggregation and continuous ordering transition in morphology.

Juan Li¹, Sami Hietala, Xuelin Tian

¹Department of Materials Science and Engineering, Aalto University , Espoo 02150, Finland.

|December 17, 2014

Summary

Researchers developed organic-free barium titanate (BaTiO3) supercages using a novel molten salt method. These unique structures form through oriented nanoparticle aggregation and ordering, leading to enhanced microwave absorption properties.

Keywords:

electric double layer hollow structures mesocrystals microwave absorption molten hydrated salt ordering transition oriented aggregation

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Last Updated: Apr 19, 2026

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

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Published on: August 2, 2012

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Published on: October 16, 2017

Area of Science:

Materials Science
Nanotechnology
Solid State Chemistry

Background:

Barium titanate (BaTiO3) is a versatile ceramic with significant applications.
Conventional synthesis methods often require organic templates and additives.
Controlling nanoparticle aggregation is crucial for advanced material structures.

Purpose of the Study:

To report the synthesis of organic-free mesocrystalline superstructured barium titanate (BaTiO3) cages.
To investigate the formation mechanism of these unique BaTiO3 supercages.
To evaluate the microwave absorption properties of the synthesized BaTiO3 supercages.

Main Methods:

A one-step, templateless, and additive-free synthesis route.
Utilizing molten hydrated salt as the reaction medium.
Observing 3D oriented aggregation of BaTiO3 nanoparticles.

Main Results:

Formation of unique BaTiO3 supercages via oriented aggregation and ordering.
Identification of nanoparticle faceting and nanosheet formation during synthesis.
Demonstration of improved microwave absorption properties in the BaTiO3 supercages.

Conclusions:

Successful synthesis of organic-free BaTiO3 supercages is achieved.
The unique structure arises from a novel oriented aggregation and ordering process.
The resulting BaTiO3 supercages show enhanced microwave absorption capabilities.