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The Colloidal State

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...

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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...

Colloids and Suspensions

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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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A Modular Microfluidic Technology for Systematic Studies of Colloidal Semiconductor Nanocrystals

A Modular Microfluidic Technology for Systematic Studies of Colloidal Semiconductor Nanocrystals

Published on: May 10, 2018

Monodisperse colloids synthesized with nanofluidic technology.

Florent Malloggi¹, Nicolas Pannacci, Rafaële Attia

¹MMN, Gulliver, ESPCI 10 rue Vauquelin, 75005 Paris, France.

Langmuir : the ACS Journal of Surfaces and Colloids

|November 18, 2009

Summary

Researchers developed novel nanofluidic devices to precisely create colloidal droplets and particles. This breakthrough enables new applications in material science and drug delivery, including cellular uptake studies.

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

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

Published on: March 13, 2016

Area of Science:

Nanotechnology
Materials Science
Biomedical Engineering

Background:

Current methods for generating micrometric colloidal droplets face limitations impacting material science and drug delivery applications.
Developing precise and scalable methods for colloidal particle generation is crucial for advancing these fields.

Purpose of the Study:

To overcome existing limitations in colloidal droplet generation using innovative nanofluidic devices.
To demonstrate the fabrication of various colloidal structures, including droplets, particles, and Janus particles, within the submicrometric to micrometric range.

Main Methods:

Utilized dedicated nanofluidic devices with submicrometric channels.
Leveraged a physical effect termed capillary focusing for droplet generation.
Employed rapid fabrication technologies for soft material-based devices.

Main Results:

Successfully generated simple droplets, multiple droplets, particles, and Janus particles ranging from 900 nm to 3 microm.
Assembled colloidal droplets on-chip into ordered clusters and crystals, producing discrete diffraction patterns.
Demonstrated the potential for drug delivery applications through the phagocytosis of multiple droplets by murine macrophage-type cells.

Conclusions:

The developed nanofluidic approach offers a versatile platform for producing well-defined colloidal particles and structures.
This method addresses key limitations in colloidal droplet generation, paving the way for advanced material science and drug delivery systems.
The demonstrated cellular uptake highlights the therapeutic potential of these engineered colloidal systems.