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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...

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Related Experiment Video

Updated: Apr 12, 2026

Synthesis and Characterization of Supramolecular Colloids

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Multifunctional self-assembled composite colloids and their application to SERS detection.

Andrea La Porta¹, Ana Sánchez-Iglesias, Thomas Altantzis

¹Bionanoplasmonics Laboratory, CIC biomaGUNE, Paseo de Miramón 182, 20009 Donostia - San Sebastián, Spain. llizmarzan@cicbiomagune.es.

|May 7, 2015

Summary

This summary is machine-generated.

We developed hybrid colloidal composites combining gold nanostars and iron oxide nanoparticles. This dual-responsive material enhances surface-enhanced Raman scattering detection with magnetic field control.

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Area of Science:

Materials Science
Nanotechnology
Chemistry

Background:

Developing multifunctional nanomaterials is crucial for advanced sensing applications.
Hybrid colloidal composites offer unique properties by integrating different nanoparticles.
Controlling nanoparticle assembly and surface properties is key for tailored functionalities.

Purpose of the Study:

To create a simple method for co-encapsulating gold nanostars and iron oxide nanoparticles into hybrid colloidal composites.
To develop a material responsive to both light and magnetic fields for enhanced sensing.
To evaluate the performance of these hybrid composites as substrates for surface-enhanced Raman scattering (SERS).

Main Methods:

Self-assembly driven by hydrophobic interactions between polystyrene-capped gold nanostars and oleic acid-stabilized iron oxide nanocrystals.
Encapsulation of colloidal particle clusters using a block copolymer to achieve hydrophilicity.
Characterization using electron microscopy to confirm composite structure (single Au nanostar per cluster).

Main Results:

Successfully synthesized hybrid colloidal composites containing gold nanostars and numerous iron oxide nanoparticles.
Demonstrated efficient surface-enhanced Raman scattering (SERS) activity using common dyes as probes.
Achieved magnetic responsiveness, enabling particle accumulation via an external magnetic field.
Established low nanomolar (nM) limits of detection for SERS analysis.

Conclusions:

The developed hybrid colloidal composites offer a versatile platform for sensitive SERS detection.
The combination of optical (gold nanostars) and magnetic (iron oxide nanoparticles) properties provides dual responsiveness.
This method facilitates the creation of advanced nanomaterials for analytical and diagnostic applications.