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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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Colloids and Suspensions01:17

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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 visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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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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Pore Size Distribution01:23

Pore Size Distribution

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In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
Adequate...
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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.
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Core-Shell SiO2-PS Colloids with Controlled Eccentric Ratio.

Yitong Li1,2, Bing Liu1

  • 1State Key Laboratory of Polymer Physics and Chemistry, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.

ACS Macro Letters
|June 2, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed a method to control the location of silica (SiO2) cores within polystyrene (PS) core-shell colloids. Adjusting the ethanol/water ratio precisely tunes the core

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Area of Science:

  • Materials Science
  • Colloid Chemistry
  • Nanotechnology

Background:

  • Core-shell colloids are widely synthesized and utilized.
  • Precise control over the microstructure of colloidal particles is essential for advanced applications.
  • A significant challenge in core-shell colloid synthesis is controlling the precise location of the core within the shell.

Purpose of the Study:

  • To explore the synthesis of SiO2-PS core-shell colloids.
  • To investigate methods for precisely controlling the eccentric ratio (core location) in these colloids.
  • To establish a structure transition sequence based on solvent composition.

Main Methods:

  • Synthesis of SiO2-PS core-shell colloids using core particles, monomer, initiator, and a water/ethanol mixture.
  • Systematic variation of the ethanol/water ratio in the reaction medium.
  • Application of a two-step polymerization procedure to control core location.

Main Results:

  • The ethanol/water ratio induces a distinct structure transition sequence: eccentric to concentric, and back to eccentric.
  • The eccentric ratio of SiO2-PS core-shell colloids can be precisely controlled.
  • A two-step polymerization method offers fine-tuning of SiO2 core positioning within the PS shell.

Conclusions:

  • The study demonstrates a controllable method for synthesizing SiO2-PS core-shell colloids with tunable core locations.
  • Precise control over core eccentricity opens new avenues for designing advanced colloidal materials.
  • These findings are expected to expand the applications of core-shell colloids, particularly with functionalized core or shell components.