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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...

Colloids

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 precipitates

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...

Coagulation

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 Suspensions

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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Facile Preparation of Internally Self-assembled Lipid Particles Stabilized by Carbon Nanotubes

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Published on: February 19, 2016

Assessing colloidal stability of long term MWCNT based nanofluids.

Bruno Lamas¹, Bruno Abreu, Alexandra Fonseca

¹Mechanical Engineering Department, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal. brunolamas@ua.pt

Journal of Colloid and Interface Science

|June 15, 2012

Summary

Functionalized multiwalled carbon nanotubes create stable nanofluids, with stability increasing at higher concentrations and nanoparticle aspect ratios. This research aids in developing stable, industrially applicable nanofluids.

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Published on: December 25, 2017

Area of Science:

Materials Science
Nanotechnology
Colloid Science

Background:

Functionalized multiwalled carbon nanotubes (f-MWCNTs) are crucial for advanced materials.
Assessing the colloidal stability of nanofluids is essential for their practical applications.
Existing methods for stability assessment can be limited by dilution or accuracy.

Purpose of the Study:

To evaluate the colloidal stability of functionalized multiwalled carbon nanotubes based nanofluids.
To introduce and utilize an innovative centrifugation technique for measuring settling velocity without dilution.
To investigate the impact of nanoparticle concentration and aspect ratio on nanofluid stability.

Main Methods:

Utilized an innovative centrifugation technique to measure settling velocity of nanofluids.
Performed measurements without sample dilution to enhance accuracy.
Varied nanoparticle volume fraction from 0.25% to 1.50% and analyzed nanoparticle aspect ratio effects.

Main Results:

Functionalization significantly enhances the colloidal stability of multiwalled carbon nanotubes based nanofluids.
Hindered settling was observed, with settling velocity decreasing as nanoparticle volume fraction increased.
Higher nanoparticle aspect ratios were found to directly improve colloidal stability.

Conclusions:

Functionalization is key to producing highly stable nanofluids.
Nanofluid stability is concentration-dependent and influenced by interparticle interactions and nanoparticle geometry.
The findings support the tailored engineering of stable nanofluids for enhanced industrial applications.