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Related Concept Videos

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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Recrystallization: Solid–Solution Equilibria01:10

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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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Centrifugation01:05

Centrifugation

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Centrifugation is a separation technique based on differences in density or size. It is commonly used to separate solids from aqueous interferents. During centrifugation, the sample is placed in centrifugation tubes and spun at high angular velocity, which allows centrifugal force to act differentially on the different densities or masses of the components. After spinning, the supernatant liquid is decanted. Depending on the specific application, either the pellet or the supernatant is retained...
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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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Coagulation01:06

Coagulation

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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Spatial Separation of Molecular Conformers and Clusters
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Solid Separation from a Mixed Suspension through Electric-Field-Enhanced Crystallization.

Wei W Li1, Norbert Radacsi1,2, Herman J M Kramer1

  • 1Process and Energy Department, Delft University of Technology, Leeghwaterstraat 39, 2628 CB, Delft, The Netherlands.

Angewandte Chemie (International Ed. in English)
|November 19, 2016
PubMed
Summary
This summary is machine-generated.

A novel electric field method separates organic crystals like phenazine and caffeine from solutions. This technique achieves high purity and shows potential for industrial-scale crystal recovery.

Keywords:
crystal engineeringdielectrophoresiselectrophoresismulticomponent mixturesseparation technology

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Electrochemistry

Background:

  • Separating crystalline compounds from solutions is crucial for industrial processes.
  • Existing methods for crystal separation can be inefficient or complex.

Purpose of the Study:

  • To investigate the phenomenon of electric-field-induced particle movement in suspensions.
  • To develop a new method for separating and purifying organic crystalline compounds.
  • To assess the feasibility of this method for industrial applications.

Main Methods:

  • Applying a strong, inhomogeneous electric field to a suspension of organic crystals in an apolar solvent (1,4-dioxane).
  • Collecting phenazine and caffeine crystals at separate electrodes.
  • Utilizing cooling crystallization for immobilization and growth of collected particles.
  • Analyzing the purity of the separated compounds.

Main Results:

  • Organic crystals (phenazine and caffeine) were successfully collected at different electrodes.
  • The separated crystals achieved purities greater than 91%.
  • The method demonstrated effective separation of components from a binary mixture.

Conclusions:

  • Electric-field-induced particle movement is a viable phenomenon for crystal separation.
  • This technique offers a promising new approach for purifying organic crystalline compounds.
  • The method has potential for scalable application in complex industrial separation processes.