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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Structures of Solids02:22

Structures of Solids

Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
Molecular Shapes01:18

Molecular Shapes

Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.Two regions of electron density in a diatomic...
Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
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 the dxy,...

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Preparation of Functional Silica Using a Bioinspired Method
08:04

Preparation of Functional Silica Using a Bioinspired Method

Published on: August 1, 2018

On form dictating function: shape and structural effects in silica-based functional materials.

Mario Pagliaro1, Rosaria Ciriminna, Giovanni Palmisano

  • 1Istituto per lo Studio dei Materiali Nanostrutturati, CNR, via Ugo La Malfa 153, 90146 Palermo, Italy. mario.pagliaro@ismn.cnr.it

Chemical Record (New York, N.Y.)
|February 11, 2010
PubMed
Summary
This summary is machine-generated.

The morphology of sol-gel materials, from macro to nanoscale, dictates their function. Understanding the form-activity relationship in silica-based materials guides future research in this developing area.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Sol-gel materials possess properties influenced by their morphology across various scales.
  • Understanding the relationship between material form and function is crucial for developing advanced applications.
  • Silica-based materials are widely used and offer a versatile platform for exploring structure-property relationships.

Purpose of the Study:

  • To investigate the critical role of morphology in controlling the function and utility of sol-gel materials.
  • To establish general concepts linking the form and activity of functional silica-based materials.
  • To guide future research directions in the field of sol-gel material science.

Main Methods:

  • Review of recent scientific achievements and literature.
  • Analysis of the relationship between macro-, meso-, and nanoscale morphology and material activity.
  • Focus on silica-based functional materials as a model system.

Main Results:

  • Morphology at all scales (macro, meso, nano) significantly impacts sol-gel material performance.
  • A strong correlation exists between the specific form of silica-based materials and their resulting activity.
  • Key concepts for predicting material utility based on morphology were elucidated.

Conclusions:

  • The form-activity relationship is a fundamental principle for designing functional sol-gel materials.
  • This understanding provides a framework for targeted research and development in sol-gel science.
  • Further exploration of morphology control can unlock new applications for silica-based materials.