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Micelles01:30

Micelles

Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
Surface Active Agents01:27

Surface Active Agents

Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...

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Related Experiment Video

Updated: May 7, 2026

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
08:19

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles

Published on: March 2, 2016

Comparative study on coating CdSe nanocrystals with surfactants.

Sławomir Oszwałdowski1, Kenneth P Roberts

  • 1Faculty of Chemistry, Department of Analytical Chemistry, Warsaw University of Technology, ul. Noakowskiego 3, 00-664 Warsaw, Poland.

Mikrochimica Acta
|October 1, 2013
PubMed
Summary
This summary is machine-generated.

Surfactant coating of cadmium selenide (CdSe) nanocrystals (NCs) influences their photoluminescence and aqueous dispersibility. The hydrophobicity-hydrophilicity balance of surfactants is key for effective transfer and spectral property modification.

Keywords:
Cloud-point extractionDispersionOptical spectraSemiconductor nanocrystalsSurfactants

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Related Experiment Videos

Last Updated: May 7, 2026

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
08:19

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Published on: March 2, 2016

Synthesis of Ligand-free CdS Nanoparticles within a Sulfur Copolymer Matrix
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Solution-Processed, Surface-Engineered, Polycrystalline CdSe-SnSe Exhibiting Low Thermal Conductivity
09:23

Solution-Processed, Surface-Engineered, Polycrystalline CdSe-SnSe Exhibiting Low Thermal Conductivity

Published on: May 17, 2024

Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Cadmium selenide (CdSe) nanocrystals (NCs) are synthesized with hydrophobic ligands like trioctylphosphine oxide (TOPO).
  • Dispersing these NCs in aqueous solutions requires surface modification with surfactants.
  • Understanding surfactant interactions is crucial for tuning NC properties.

Purpose of the Study:

  • To investigate the effect of surfactant structure and ligand type on CdSe nanocrystal coating.
  • To analyze how surfactant coating impacts the photoluminescence (PL) and spectral features of CdSe NCs.
  • To correlate CdSe NC size and surfactant coating with their distribution in aqueous-surfactant systems.

Main Methods:

  • Synthesis of CdSe NCs (2.2–5.1 nm) passivated with TOPO/TOP or TOPO/TBP.
  • Biphasic transfer of NCs into aqueous solutions using various ionic and non-ionic surfactants.
  • Characterization of spectral properties (absorbance, PL) and analysis of PL per absorbance unit.
  • Cloud point extraction to study NC distribution between pseudophases.

Main Results:

  • Surfactant structure and native ligand govern NC coating efficacy.
  • Hydrophobicity-hydrophilicity balance of surfactants dictates successful aqueous phase transfer.
  • PL intensity and wavelength are affected by ligand type and surfactant coating.
  • CdSe NC size correlates with surfactant coating in aqueous pseudophases.

Conclusions:

  • Surfactant coating is critical for dispersing hydrophobic CdSe NCs in water.
  • The choice of surfactant and its interaction with NC surface ligands modulate spectral properties.
  • Non-ionic surfactant coating influences the size-dependent behavior of CdSe NCs in aqueous systems.