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Related Concept Videos

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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Colloidal precipitates01:09

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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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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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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Controlled-Potential Coulometry: Electrolytic Methods01:17

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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
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Controlled-Current Coulometry: Overview01:27

Controlled-Current Coulometry: Overview

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Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
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Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions
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Controlling colloidal particles with electric fields.

Tara D Edwards1, Michael A Bevan

  • 1Chemical & Biomolecular Engineering, Johns Hopkins University , Baltimore, Maryland 21218, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 8, 2014
PubMed
Summary
This summary is machine-generated.

Electric fields precisely control colloids and colloidal structures. This review details methods for assembly, disassembly, and feedback control of colloidal crystals, enabling defect-free structures.

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Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles
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Area of Science:

  • Colloid and Interface Science
  • Soft Matter Physics
  • Nanotechnology

Background:

  • Colloidal systems are fundamental in materials science and nanotechnology.
  • Understanding electrokinetic transport and equilibrium colloidal interactions is key to manipulating these particles.
  • Previous research has established foundational principles for electric field-mediated colloidal control.

Purpose of the Study:

  • To provide a comprehensive instructional review on controlling individual and ensemble colloids using electric fields.
  • To detail the mechanisms, experimental setups, and analytical methods for electric field-based colloidal manipulation.
  • To explore advanced applications such as feedback control for colloidal crystal assembly and disassembly.

Main Methods:

  • Utilizing electrokinetic transport mechanisms and kT-scale equilibrium colloidal interactions.
  • Employing specific experimental configurations, microscopy techniques, and image analysis.
  • Applying electric fields to assemble colloidal chains, quasi-2D, and 3D colloidal crystals.

Main Results:

  • Demonstrated successful control over individual and ensembles of colloids using electric fields.
  • Presented methods for fabricating various colloidal structures, including chains and crystals.
  • Showcased electric-field-mediated feedback control for dynamic manipulation of colloidal crystal size, assembly, and disassembly.

Conclusions:

  • Electric field control offers a versatile platform for precise colloidal manipulation.
  • The reviewed methods enable the creation of ordered colloidal structures with potential applications in materials science.
  • Future work will integrate dynamic models for enhanced feedback control, facilitating rapid and defect-free colloidal structure fabrication.