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Related Concept Videos

Coagulation01:06

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...
Colloidal precipitates01:09

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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Related Experiment Video

Updated: Jun 29, 2026

High-resolution Patterning Using Two Modes of Electrohydrodynamic Jet: Drop on Demand and Near-field Electrospinning
09:16

High-resolution Patterning Using Two Modes of Electrohydrodynamic Jet: Drop on Demand and Near-field Electrospinning

Published on: July 10, 2018

Collodial cluster arrays by electrohydrodynamic printing.

Sibel Korkut1, Dudley A Saville, Ilhan A Aksay

  • 1Department of Chemical Engineering, Princeton University, Princeton, NJ 08544-5263, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|October 11, 2008
PubMed
Summary
This summary is machine-generated.

Stable electrohydrodynamic jets enable printing of colloidal suspensions on hydrophobic surfaces. Capillary forces drive particle self-assembly into diverse single-particle or cluster arrays during liquid evaporation.

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Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Nanotechnology

Background:

  • Colloidal self-assembly is crucial for creating ordered nanomaterials.
  • Controlling particle arrangement on surfaces remains a challenge.
  • Electrohydrodynamic (EHD) printing offers precise deposition methods.

Purpose of the Study:

  • To investigate the self-assembly of colloidal particles printed via electrohydrodynamics on hydrophobic surfaces.
  • To explore the influence of particle concentration on the resulting structures.
  • To characterize the unique cluster formations influenced by substrate interactions.

Main Methods:

  • Utilized a stable electrohydrodynamic jet for printing colloidal suspensions.
  • Deposited patterns onto hydrophobic substrates.
  • Observed particle self-assembly during solvent evaporation guided by capillary forces.
  • Analyzed the resulting particle arrays and clusters using microscopy and structural analysis.

Main Results:

  • Printed lines successfully broke into sessile drops on the hydrophobic surface.
  • Capillary forces during evaporation directed the self-assembly of colloidal particles.
  • Arrays of single colloidal particles and particle clusters were formed, dependent on suspension concentration.
  • Clusters containing more than three particles exhibited distinct structures compared to those formed without a substrate.
  • Multiple distinct structures were observed for the same number of particles within clusters.

Conclusions:

  • Electrohydrodynamic printing combined with substrate-guided self-assembly provides a versatile method for creating ordered colloidal arrays.
  • The hydrophobic surface and capillary forces play a critical role in dictating the final particle arrangement and cluster morphology.
  • This technique allows for the generation of complex colloidal structures with potential applications in advanced materials and devices.