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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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Updated: Dec 27, 2025

Synthesis and Characterization of Supramolecular Colloids

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Multivalent Patchy Colloids for Quantitative 3D Self-Assembly Studies.

Marlous Kamp^1,2, Bart de Nijs^1,2, Marjolein N van der Linden¹

¹Soft Condensed Matter, Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 1, 3584 CC Utrecht, The Netherlands.

Langmuir : the ACS Journal of Surfaces and Colloids

|February 26, 2020

Summary

This summary is machine-generated.

Researchers developed methods to create fluorescently labeled silica particles with titania protrusions. These patchy particles were then self-assembled into open networks, advancing materials science and nanotechnology.

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Area of Science:

Materials Science
Nanotechnology
Colloid Science

Background:

Previous methods involved surface patterning of silica particles in colloidal crystals.
Limited characterization and self-assembly capabilities existed for complex patchy particles.

Purpose of the Study:

To synthesize sub-micron and micron-sized patchy silica particles with fluorescently labeled titania protrusions.
To develop efficient characterization methods for these particles.
To achieve self-assembly into non-close-packed structures.

Main Methods:

Surface patterning of silica particles with silane coupling agents.
Synthesis of hemispherical amorphous titania protrusions labeled with fluorescent dyes.
Confocal and super-resolution microscopy for particle characterization.
Exploiting solvophobic attractions for self-assembly into gel networks.

Main Results:

Successfully synthesized fluorescently labeled patchy silica-titania particles.
Determined the number of protrusions per particle using confocal microscopy with high statistical significance.
Compared experimental distributions with simulations of patch formation.
Achieved self-assembly into open percolating gel networks.

Conclusions:

The developed methods enable the synthesis and characterization of complex patchy particles.
Fluorescent labeling allows for detailed imaging and quantitative analysis.
Self-assembly into open networks is feasible by controlling inter-particle interactions.