Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

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...

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...

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...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Strong effect of the nonpolar solvent molecular structure on CdSe nanoplatelet stacking.

Nanoscale·2026

Same author

Unraveling Dynamic Trap-State Modulation in Single Core-Crown CdSe/CdS Nanoplatelets.

Nano letters·2026

Same author

CO<sub>2</sub> electroreduction on nano-Cu-ZIF grown inside activated carbon: experimental and computational aspects.

Nanoscale advances·2026

Same author

Light-activated self-thermophoretic Janus nanopropellers.

Nanoscale·2026

Same author

Recent Advancements and Perspectives of Low-Dimensional Halide Perovskites for Visual Perception and Optoelectronic Applications.

Nano-micro letters·2025

Same author

Evidence for a non-epitaxial growth-detachment mechanism in seed-mediated glycothermal synthesis of colloidal garnet nanoparticles.

Journal of colloid and interface science·2025

Search research articles

Related Experiment Video

Updated: Apr 4, 2026

Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures

Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures

Published on: August 10, 2017

Stacking and Colloidal Stability of CdSe Nanoplatelets.

Santanu Jana¹, Trang N T Phan², Cécile Bouet³

¹Laboratoire de Physique des Solides, Univ. Paris-Sud, CNRS, UMR 8502, F-91405 Orsay Cedex, France.

Langmuir : the ACS Journal of Surfaces and Colloids

|September 8, 2015

Summary

Researchers optimized colloidal stability for cadmium selenide (CdSe) nanoplatelets by adjusting ligand concentration. Coating platelets with polystyrene successfully prevented aggregation, preserving optical properties for material processing.

More Related Videos

Synthesis of Ligand-free CdS Nanoparticles within a Sulfur Copolymer Matrix

Synthesis of Ligand-free CdS Nanoparticles within a Sulfur Copolymer Matrix

Published on: May 1, 2016

Advanced Compositional Analysis of Nanoparticle-polymer Composites Using Direct Fluorescence Imaging

Advanced Compositional Analysis of Nanoparticle-polymer Composites Using Direct Fluorescence Imaging

Published on: July 19, 2016

Related Experiment Videos

Last Updated: Apr 4, 2026

Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures

Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures

Published on: August 10, 2017

Synthesis of Ligand-free CdS Nanoparticles within a Sulfur Copolymer Matrix

Synthesis of Ligand-free CdS Nanoparticles within a Sulfur Copolymer Matrix

Published on: May 1, 2016

Advanced Compositional Analysis of Nanoparticle-polymer Composites Using Direct Fluorescence Imaging

Advanced Compositional Analysis of Nanoparticle-polymer Composites Using Direct Fluorescence Imaging

Published on: July 19, 2016

Area of Science:

Materials Science
Colloid Chemistry
Nanotechnology

Background:

Colloidal cadmium selenide (CdSe) nanoplatelets offer tunable optical properties due to precise thickness control.
Their self-assembly and dispersion state significantly influence optical characteristics and processability.
Colloidal stability is crucial for practical applications and material processing.

Purpose of the Study:

To investigate the colloidal stability of CdSe nanoplatelets in solution.
To determine the optimal ligand (oleic acid) concentration for stability.
To develop strategies for achieving stable CdSe nanoplatelet dispersions.

Main Methods:

UV-vis spectroscopy was employed to evaluate colloidal stability at varying nanoparticle and oleic acid concentrations.
Small-angle X-ray scattering (SAXS) was used to characterize the aggregation mechanism.
Surface modification with carboxylic acid-terminated polystyrene was explored as a stabilization method.

Main Results:

An optimal concentration of oleic acid was identified for maximizing colloidal stability.
Moderately concentrated CdSe nanoplatelet dispersions were found to flocculate within minutes to hours.
SAXS revealed that aggregation occurs via face-to-face stacking driven by van der Waals forces.
Polystyrene coating successfully imparted colloidal stability without compromising optical properties.

Conclusions:

Colloidal stability of CdSe nanoplatelets is highly dependent on ligand concentration and susceptible to rapid flocculation.
Van der Waals attractions promote face-to-face stacking and aggregation.
Surface functionalization with polystyrene provides an effective route to achieve stable, processable CdSe nanoplatelet dispersions with preserved optical performance.