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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...

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...

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...

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: Oct 1, 2025

Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles

Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles

Published on: March 13, 2016

Designing active colloidal folders.

S Das¹, M Lange¹, A Cacciuto¹

¹Department of Chemistry, Columbia University, 3000 Broadway, New York, New York 10027, USA.

The Journal of Chemical Physics

|March 9, 2022

Summary

This summary is machine-generated.

Active forces can guide stiff colloidal chains into specific 2D folded structures. Researchers found a direct link between force patterns and resulting shapes, enabling designable and reconfigurable active polymers.

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Last Updated: Oct 1, 2025

Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles

Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles

Published on: March 13, 2016

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Published on: May 12, 2020

Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly

Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly

Published on: November 4, 2021

Area of Science:

Soft Matter Physics
Polymer Physics
Colloidal Science

Background:

Active polymers offer unique possibilities for self-assembly and programmable matter.
Understanding how to control the folding of active polymers is crucial for designing functional materials.

Purpose of the Study:

To investigate the potential of active forces to induce consistent collapse and folding in active polymers.
To develop a model for active colloidal folders and explore their structural and dynamic properties.
To establish a method for designing specific folded structures by controlling active force sequences.

Main Methods:

Numerical simulations of a simple model of active colloidal folders.
Statistical analysis of structure and dynamics using various numerical techniques.
Exploration of force patterns (sequences) perpendicular to the polymer backbone.

Main Results:

Active forces, when organized in specific patterns, can generate designable and reconfigurable 2D folded structures.
A direct correspondence exists between the sequence of active forces and the resulting folded conformations.
An ensemble of highly mobile compact structures was observed, capable of transitioning between conformations.

Conclusions:

Active forces are a viable mechanism for controlling the folding of active polymers into predictable structures.
The developed model provides a framework for designing specific polymer folds by tuning active force sequences.
This approach has implications for the design of programmable materials and biomimetic systems.