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Related Concept Videos

The Colloidal State01:29

The Colloidal State

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 the...
Colloids03:22

Colloids

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...
Colloidal precipitates01:09

Colloidal precipitates

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...
Coagulation01:06

Coagulation

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...
Colloids and Suspensions01:17

Colloids and Suspensions

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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Visible-light Induced Reduction of Graphene Oxide Using Plasmonic Nanoparticle
07:24

Visible-light Induced Reduction of Graphene Oxide Using Plasmonic Nanoparticle

Published on: September 22, 2015

PS colloidal particles stabilized by graphene oxide.

Xiaohui Song1, Yongfang Yang, Jinchuan Liu

  • 1Key Laboratory of Functional Polymer Materials, Ministry of Education, Department of Chemistry, Nankai University, Tianjin 300071, PR China.

Langmuir : the ACS Journal of Surfaces and Colloids
|January 4, 2011
PubMed
Summary
This summary is machine-generated.

Graphene oxide (GO) sheets stabilize Pickering emulsions, leading to the creation of polystyrene (PS) colloidal particles with GO on their surface. GO sheet size influences PS particle formation, with smaller GO sheets yielding GO-stabilized PS colloidal particles.

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Synthesis of Graphene Nanofluids with Controllable Flake Size Distributions
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Synthesis of Graphene Nanofluids with Controllable Flake Size Distributions
07:32

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Area of Science:

  • Materials Science
  • Colloid and Surface Chemistry

Background:

  • Graphene oxide (GO) possesses both hydrophilic functional groups and a hydrophobic carbon surface.
  • These amphiphilic properties enable GO sheets to stabilize interfaces, particularly oil-water interfaces.

Purpose of the Study:

  • To prepare graphene oxide (GO)-stabilized polystyrene (PS) colloidal particles using Pickering emulsion polymerization.
  • To investigate the influence of GO sheet size on the characteristics of the resulting PS colloidal particles.

Main Methods:

  • Oxidation of graphite to prepare exfoliated graphene oxide (GO) sheets.
  • Utilizing GO sheets as stabilizers in the Pickering emulsion polymerization of styrene.
  • Characterization of the GO-stabilized PS colloidal particles using Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM), and X-ray Photoelectron Spectroscopy (XPS).

Main Results:

  • GO sheets effectively stabilized the oil-water interface, enabling Pickering emulsion formation.
  • Polystyrene (PS) colloidal particles decorated with GO sheets were successfully synthesized.
  • The size of the GO sheets significantly impacted the morphology of the PS colloidal particles; smaller GO sheets resulted in GO-stabilized PS colloidal particles, while larger GO sheets led to smaller PS particles forming on the GO surface.

Conclusions:

  • Graphene oxide (GO) is an effective stabilizer for Pickering emulsion polymerization.
  • The successful preparation of GO-stabilized PS colloidal particles was confirmed through various characterization techniques.
  • GO sheet size is a critical parameter influencing the size and formation of the synthesized PS colloidal particles.