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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

2.9K
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...
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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Crystal Field Theory
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.
CFT focuses on...
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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

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Colloidal Metal Nanocrystals with Metastable Crystal Structures.

Annemieke Janssen1, Quynh N Nguyen1, Younan Xia1,2,3

  • 1School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia, 30332, USA.

Angewandte Chemie (International Ed. in English)
|January 21, 2021
PubMed
Summary
This summary is machine-generated.

Engineering metal nanocrystals with novel crystal structures, beyond traditional parameters, enhances their properties. This review explores synthesis strategies for metastable phases in noble metals, focusing on catalytic improvements.

Keywords:
crystal structuremetal nanocrystalmetastable phasepolymorphismstructure-property relationship

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Catalysis

Background:

  • Conventional control over metal nanocrystals includes composition, size, shape, and defects.
  • Crystal structure (phase) presents a novel parameter for property engineering.
  • Metastable phases of noble metal nanocrystals offer unique properties compared to bulk counterparts.

Purpose of the Study:

  • To review fabrication strategies for colloidal metal nanocrystals in metastable phases.
  • To discuss the synthesis of noble metal nanocrystals in unconventional crystal structures.
  • To highlight enhanced catalytic properties resulting from these engineered phases.

Main Methods:

  • Introduction to atomic packing in noble metals.
  • Discussion of five major synthetic approaches for colloidal nanocrystals in unconventional phases.
  • Analysis of mechanistic insights and experimental controls in synthesis.

Main Results:

  • Successful synthesis of noble metal nanocrystals in metastable phases.
  • Demonstration of enhanced catalytic performance due to engineered crystal structures.
  • Insights into synthetic mechanisms and control over nanocrystal formation.

Conclusions:

  • Crystal structure is a powerful tool for tuning metal nanocrystal properties.
  • Advanced synthetic strategies enable access to metastable phases with superior catalytic activity.
  • Future research should address remaining challenges and explore new opportunities in this field.