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Related Concept Videos

Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
Precipitation Processes01:12

Precipitation Processes

The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
Types of Coprecipitation01:10

Types of Coprecipitation

Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
Sometimes, ions in a crystal lattice can undergo isomorphous replacement by inclusions of similar charge and size. For...
Precipitation of Ions03:11

Precipitation of Ions

Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
Precipitation Reactions03:10

Precipitation Reactions

In a precipitation reaction, aqueous solutions of soluble salts react to give an insoluble ionic compound – the precipitate. The reaction occurs when oppositely charged ions in solution overcome their attraction for water and bind to each other, forming a precipitate that separates out from the solution. Since such reactions involve the exchange of ions between ionic compounds in aqueous solution, they are also referred to as double displacement, double replacement, exchange reactions, or...
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...

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Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly
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Pattern formation and self-organization in a simple precipitation system.

András Volford1, Ferenc Izsák, Mátyás Ripszám

  • 1Department of Chemical Physics, Budapest University of Technology and Economics, Budapest H-1521, Hungary.

Langmuir : the ACS Journal of Surfaces and Colloids
|January 24, 2007
PubMed
Summary

Researchers observed dynamic traveling waves and spiral patterns in a new aluminum hydroxide precipitation system, offering insights into geochemical self-organization.

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Area of Science:

  • Chemical Kinetics
  • Geochemistry
  • Pattern Formation

Background:

  • Reaction-diffusion systems exhibit pattern formation and self-organization in various natural systems.
  • Precipitation patterns, like Liesegang rings, are well-documented, but dynamic patterns were previously unobserved in precipitation systems.
  • The Belousov-Zhabotinsky reaction is a classic example of dynamic patterns in reaction-diffusion systems.

Purpose of the Study:

  • To investigate pattern formation in a novel reaction-diffusion system involving aluminum hydroxide precipitation.
  • To explore the coupling of precipitation fronts with traveling waves.
  • To provide experimental evidence for dynamic pattern formation in precipitation systems.

Main Methods:

  • A new, simple reaction-diffusion system was designed using two inorganic reactants.
  • The system focuses on the precipitation and complex formation of aluminum hydroxide.
  • Experimental observation of pattern formation within the precipitation front.

Main Results:

  • The study reports a unique form of self-organization.
  • Spontaneous appearance of traveling waves within the precipitation front was observed.
  • Formation of spiral patterns inside the precipitation front was documented.

Conclusions:

  • Dynamic pattern formation, including traveling waves and spirals, is achievable in simple precipitation systems.
  • This research presents the first experimental evidence of such dynamic patterns in precipitation.
  • The findings offer a new perspective on precipitation pattern formation and geochemical self-organization.