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Related Concept Videos

Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

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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...
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Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

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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...
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Minerals01:26

Minerals

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Minerals are essential nutrients that the human body needs in small amounts to work properly. They play a vital role in many bodily functions, such as building strong bones and transmitting nerve impulses. Some minerals are needed for hormone production or to maintain a normal heartbeat. Major minerals include calcium, phosphorus, potassium, sulfur, sodium, chlorine, and magnesium, while trace minerals include iron, manganese, copper, iodine, zinc, cobalt, fluoride, and selenium.
 
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Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

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A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
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Spontaneity02:21

Spontaneity

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A spontaneous process is one that occurs naturally under certain conditions. A nonspontaneous process, on the other hand, will not take place unless it is “driven” by the continual input of energy from an external source. Processes have a natural tendency to occur in one direction under a given set of conditions. Water will naturally flow downhill (spontaneous process), but uphill flow (nonspontaneous process) requires outside intervention such as the use of a pump. Iron exposed to...
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The Colloidal State01:29

The Colloidal State

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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...
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Mineralization and non-ideality: on nature's foundry.

Ashit Rao1, Helmut Cölfen2

  • 1Freiburg Institute for Advanced Studies, Albert Ludwigs University of Freiburg, 79104, Freiburg im Breisgau, Germany. ashit.rao@frias.uni-freiburg.de.

Biophysical Reviews
|May 17, 2017
PubMed
Summary

Physico-chemical non-ideality, including macromolecular crowding, significantly impacts mineral formation in biological systems. This understanding offers new ways to control biomineralization and biomimetic mineral properties.

Keywords:
BiomineralizationCrystallizationLiquid phaseMolecular crowdingNon-idealityNucleation

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Area of Science:

  • Biophysics
  • Materials Science
  • Geochemistry

Background:

  • Understanding ion, ion-cluster, and particle behavior in non-ideal environments is crucial across scales.
  • Biomineralization involves complex biological media, making isolated chemical additive analysis insufficient.
  • Previous studies often overlook the impact of non-ideal conditions on mineral formation.

Purpose of the Study:

  • To review the consequences of physico-chemical non-ideality on mineral formation in biological contexts.
  • To explore how macromolecular crowding, confinement, and liquid-like organic phases influence biomineralization.
  • To highlight novel prospects for additive-controlled nucleation and crystallization derived from a biophysical perspective.

Main Methods:

  • Literature review focusing on biophysical principles governing mineral formation.
  • Analysis of how non-ideal conditions affect mineral nucleation and crystallization processes.
  • Synthesis of findings related to biogenic and biomimetic mineral formation under non-ideal circumstances.

Main Results:

  • Non-ideal conditions, such as macromolecular crowding and confinement, significantly alter mineral nucleation and crystallization.
  • Liquid-like organic phases also play a critical role in modulating mineral formation pathways.
  • These non-ideal factors demonstrably affect the final form, structure, and composition of minerals.

Conclusions:

  • A biophysical viewpoint is essential for a holistic understanding of biomineralization.
  • Non-ideal environments offer new avenues for controlling the properties of biogenic and biomimetic minerals.
  • The study underscores the profound influence of environmental non-ideality on mineral formation.