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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

560
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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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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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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Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

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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...
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Colloids03:22

Colloids

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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-Current Coulometry: Coulometric Titration01:18

Controlled-Current Coulometry: Coulometric Titration

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Coulometric titrations are a form of titrimetric analysis where the reagent is generated electrically, and its amount is evaluated based on current and generating time. The electron serves as the standard reagent. The procedure is similar to conventional titrations, such as endpoint detection.
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Synthesis and Characterization of Supramolecular Colloids
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Controlling Phase in Colloidal Synthesis.

Emma J Endres1, Jeremy R Bairan Espano1, Alexandra Koziel1

  • 1Department of Chemistry, Vanderbilt University, 2301 Vanderbilt Place, Nashville, Tennessee 37235, United States.

ACS Nanoscience Au
|June 24, 2024
PubMed
Summary
This summary is machine-generated.

Controlling atomic arrangements in nanocrystal synthesis remains challenging, particularly for transition metal chalcogenides and pnictides. This perspective reviews advances and hurdles in understanding these complex materials.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Inorganic Chemistry

Background:

  • Nanocrystal properties depend on elemental composition and atomic arrangement.
  • Controlling atomic arrangement during synthesis is a key challenge, especially for transition metal chalcogenides and pnictides due to their complex phase spaces.

Purpose of the Study:

  • To review recent advances in controlling atomic arrangement during nanocrystal synthesis.
  • To highlight current challenges in the synthesis and characterization of transition metal chalcogenides and pnictides.

Main Methods:

  • Discussion of challenges in chalcogenide and pnictide chemistry.
  • Analysis of precursor breakdown mechanisms and bond dissociation energies.
  • Exploration of systematic methods for mapping synthetic phase space.
  • Examination of polytype control strategies.

Main Results:

  • Advances in understanding precursor decomposition pathways.
  • Development of organized methods for synthetic phase space exploration.
  • Insights into polytype control in nanocrystal synthesis.

Conclusions:

  • Significant challenges remain in controlling atomic arrangement and characterizing nanoscale structures.
  • Further research is needed to overcome hurdles in synthesizing and understanding transition metal chalcogenides and pnictides.