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Related Concept Videos

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...
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...
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...
Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

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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Related Experiment Video

Updated: Jun 21, 2026

Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

A simple method to produce trivalent colloidal particles.

Shan Jiang1, Steve Granick

  • 1Department of Materials Science and Engineering, University of Illinois, Urbana, Illinois 61801, USA

Langmuir : the ACS Journal of Surfaces and Colloids
|July 9, 2009
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to create trivalent patchy colloidal particles with controllable chemical compositions. This technique allows for precise modification of particle surfaces, opening new avenues in materials science.

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Tangential Flow Ultrafiltration: A &ldquo;Green&rdquo; Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles
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Published on: October 4, 2012

Generation of Zerovalent Metal Core Nanoparticles Using n-(2-aminoethyl)-3-aminosilanetriol
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Generation of Zerovalent Metal Core Nanoparticles Using n-(2-aminoethyl)-3-aminosilanetriol

Published on: February 11, 2016

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Synthesis and Characterization of Supramolecular Colloids
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Tangential Flow Ultrafiltration: A &ldquo;Green&rdquo; Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles
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Generation of Zerovalent Metal Core Nanoparticles Using n-(2-aminoethyl)-3-aminosilanetriol
08:12

Generation of Zerovalent Metal Core Nanoparticles Using n-(2-aminoethyl)-3-aminosilanetriol

Published on: February 11, 2016

Area of Science:

  • Colloidal science
  • Materials science
  • Surface chemistry

Background:

  • Colloidal particles are fundamental in various scientific fields.
  • Developing particles with specific surface chemistries is crucial for advanced applications.
  • Existing methods for creating patterned particles have limitations in control and precision.

Purpose of the Study:

  • To synthesize trivalent patchy colloidal particles with distinct chemical compositions.
  • To develop a versatile method for controlling the relative areas of chemical patches.
  • To demonstrate the efficacy of the developed synthesis technique.

Main Methods:

  • A two-step mu-contact printing method was employed for particle synthesis.
  • Particle modification was performed sequentially on opposing poles.
  • Stamp adhesion and stiffness were adjusted to control patch area and facilitate particle manipulation.
  • Scanning electron microscopy (SEM) and fluorescence imaging were used for characterization.

Main Results:

  • Successfully synthesized trivalent patchy colloidal particles with three distinct chemical patches.
  • Demonstrated control over the relative areas of the chemically modified poles.
  • Verified the particle geometry and chemical modification using SEM and fluorescence imaging.
  • The mu-contact printing method proved effective for precise surface patterning.

Conclusions:

  • The developed two-step mu-contact printing method offers a controllable approach to synthesizing trivalent patchy colloidal particles.
  • This technique allows for precise tailoring of particle surface chemistry and geometry.
  • The ability to control patch areas is a significant advancement for designing functional colloidal materials.