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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: Dec 28, 2025

Synthesis and Characterization of Supramolecular Colloids

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Exploiting Supramolecular Interactions from Polymeric Colloids for Strong Anisotropic Adhesion between Solid

Blaise L Tardy¹, Joseph J Richardson², Luiz G Greca¹

¹Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, Espoo, 02150, Finland.

Advanced Materials (Deerfield Beach, Fla.)

|February 18, 2020

Summary

This summary is machine-generated.

Researchers developed a novel bottom-up method for creating strong, self-assembling adhesives using cellulose nanocrystals (CNCs). This technique offers superior anisotropic adhesion compared to existing biomimetic approaches.

Keywords:

adhesion cellulose colloids self-assembly supramolecular interactions

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Area of Science:

Materials Science
Biomimetics
Nanotechnology

Background:

Adhesion relies on covalent or noncovalent interactions, with natural examples like gecko feet showcasing hierarchical structures for enhanced friction.
Biomimetic adhesives often use top-down lithography, but bottom-up self-assembly methods for strong, multi-length scale cohesive structures are scarce.

Purpose of the Study:

To introduce a novel bottom-up approach for creating self-assembling, anisotropic adhesives.
To investigate the formation of superstructured, adherent layers using cellulose nanocrystals (CNCs) via confined evaporation-induced self-assembly (C-EISA).

Main Methods:

Utilized aqueous dispersions of cellulose nanocrystals (CNCs).
Employed confined evaporation-induced self-assembly (C-EISA) to induce self-assembly and superstructuring.
Characterized the anisotropic adhesive strength of the resulting layers.

Main Results:

CNCs self-assembled into rigid, nematically ordered lamellae across multiple length scales due to confined evaporation stresses.
Achieved remarkable anisotropic adhesive strength, with significantly higher in-plane (≈7 MPa) compared to out-of-plane (≤0.08 MPa) adhesion.
Demonstrated that these self-assembled adhesives outperform previous top-down fabricated biomimetic adhesives.

Conclusions:

Aqueous CNC dispersions and C-EISA offer a unique, fluid-based bottom-up strategy for creating advanced anisotropic adhesives.
This approach yields emergent properties tied to colloid nature and hierarchical assembly, surpassing current microfabricated biomimetic adhesives.
Highlights the potential of C-EISA for developing novel materials with tunable adhesive properties.