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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...

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Updated: Mar 2, 2026

Flash NanoPrecipitation for the Encapsulation of Hydrophobic and Hydrophilic Compounds in Polymeric Nanoparticles

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Confining Functional Nanoparticles into Colloidal Imine-Based COF Spheres by a Sequential

David Rodríguez-San-Miguel¹, Amirali Yazdi², Vincent Guillerm²

¹Departamento de Química Inorgánica and Institute for Advanced Research in Chemical Sciences, Universidad Autónoma de Madrid, 28049, Madrid, Spain.

Chemistry (Weinheim an Der Bergstrasse, Germany)

|May 17, 2017

Summary

This summary is machine-generated.

This study introduces a two-step method to create nanoparticle-embedded covalent organic frameworks (COFs). These hybrid COF-spheres exhibit catalytic activity, showcasing a new route for functional materials.

Keywords:

covalent organic frameworks crystallization encapsulation hybrids nanoparticles

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Synthesis and Characterization of Supramolecular Colloids

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Area of Science:

Materials Science
Nanotechnology
Organic Chemistry

Background:

Covalent organic frameworks (COFs) are crystalline porous polymers.
Imparting new functionalities to COFs often requires complex synthesis routes.
Nanoparticle confinement offers a potential strategy for COF functionalization.

Purpose of the Study:

To develop a facile two-step method for creating nanoparticle-embedded COFs.
To investigate the structural transformation from amorphous to crystalline COF-hybrids.
To evaluate the catalytic potential of the resulting hybrid materials.

Main Methods:

A two-step synthesis involving nanoparticle embedding within imine-linked polymer spheres.
Initial formation of amorphous, non-porous nanoparticle-polymer composites (NP@a-1).
Post-treatment with acetic acid to yield crystalline, porous COF-hybrid spheres (NP@c-1).

Main Results:

Successfully synthesized nanoparticle-embedded amorphous and crystalline COF-hybrid spheres.
Demonstrated structural transformation from non-porous to porous COFs.
Identified catalytic activity in gold (Au@c-1) and palladium (Pd@c-1) nanoparticle-containing COF-hybrids.

Conclusions:

The reported method enables facile functionalization of COFs via nanoparticle confinement.
The resulting hybrid COF-spheres show promise as catalytic materials.
This approach provides a versatile platform for designing advanced functional porous materials.