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Colloidal precipitates

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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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Related Experiment Video

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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy

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Published on: July 18, 2014

Adhesion of colloidal particles on modified electrodes.

Volodymyr Kuznetsov¹, Georg Papastavrou

¹Physical Chemistry II, University of Bayreuth, Universitätsstrasse, 95440 Bayreuth, Germany.

Langmuir : the ACS Journal of Surfaces and Colloids

|October 18, 2012

Summary

Researchers precisely measured adhesion between silica particles and modified electrodes. They found that adhesion can be controlled by adjusting electrical potential and ionic strength, offering new possibilities for microdevices.

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Area of Science:

Surface Science and Nanotechnology
Electrochemistry
Colloid Science

Background:

Understanding interfacial forces is crucial for controlling nanoparticle interactions.
Electrical double layers and surface functional groups significantly influence adhesion at solid/liquid interfaces.
Existing methods lack precise control over these interfacial forces.

Purpose of the Study:

To quantitatively measure and understand the adhesion forces between colloidal silica particles and modified gold electrodes.
To investigate the influence of applied potential and ionic strength on interfacial adhesion.
To propose a new method for tuning adhesion forces for technological applications.

Main Methods:

Utilized the colloidal probe technique with an atomic force microscope (AFM) for direct force measurements.
Employed potentiostatic control of gold electrodes modified with self-assembled monolayers (SAMs).
Separated adhesion contributions (double-layer overlap, van der Waals, solvent exclusion, electrocapillarity) using high-force-constant cantilevers.

Main Results:

Adhesion forces were successfully tuned over a wide range by adjusting applied potential and solution ionic strength.
The primary adhesion component arises from electrical double-layer overlap, significantly influenced by external potential.
A quantitative model incorporating surface roughness accurately described the observed adhesion forces.

Conclusions:

A novel approach for tuning adhesion forces via applied potential was developed.
This method offers precise control over nanoparticle-electrode interactions.
Potential applications include microelectromechanical systems (MEMS), electrochemical sensors, and micro/nanomanipulation.