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Colloidal precipitates01:09

Colloidal precipitates

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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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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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Precipitation of Ions03:11

Precipitation of Ions

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Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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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...
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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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Related Experiment Video

Updated: Feb 19, 2026

Calcium Carbonate Formation in the Presence of Biopolymeric Additives
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Calcium Carbonate Formation in the Presence of Biopolymeric Additives

Published on: May 14, 2019

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Calcium carbonate crystallisation at charged graphite surfaces.

E R Ravenhill1, M Adobes-Vidal, P R Unwin

  • 1Department of Chemistry, University of Warwick, Gibbet Hill, Coventry, CV4 7AL, UK. P.R.Unwin@warwick.ac.uk.

Chemical Communications (Cambridge, England)
|November 8, 2017
PubMed
Summary
This summary is machine-generated.

Surface charge significantly impacts calcium carbonate crystallization. Negatively charged surfaces promote nucleation from high-energy faces, while positively charged surfaces favor stable calcite planes, offering new insights into biomineralization.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Crystallography

Background:

  • Calcium carbonate crystallization is crucial in biomineralization processes.
  • The influence of surface charge on nucleation and growth remains poorly understood.

Purpose of the Study:

  • To investigate the role of surface charge in calcium carbonate nucleation and growth.
  • To elucidate the mechanisms governing crystal face selection during crystallization on charged surfaces.

Main Methods:

  • Utilized potential-controlled Highly Oriented Pyrolytic Graphite (HOPG) surfaces.
  • Analyzed calcium carbonate crystallization under varying surface charge conditions.

Main Results:

  • Negatively charged HOPG surfaces induced nucleation from high-energy crystal faces of calcite, aragonite, and vaterite.
  • Positively charged HOPG surfaces promoted nucleation of the stable (104) calcite planes.
  • Demonstrated a significant impact of surface charge on crystal polymorph and face selection.

Conclusions:

  • Surface charge is a critical factor controlling calcium carbonate crystallization pathways.
  • The findings provide a rational explanation for observed crystallization behaviors on charged surfaces.
  • This research offers valuable insights for controlling mineral formation in various applications.