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Related Concept Videos

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: May 11, 2026

Dielectric RheoSANS — Simultaneous Interrogation of Impedance, Rheology and Small Angle Neutron Scattering of Complex Fluids
07:51

Dielectric RheoSANS — Simultaneous Interrogation of Impedance, Rheology and Small Angle Neutron Scattering of Complex Fluids

Published on: April 10, 2017

Electrorheological fluids based on metallo-supramolecular polyelectrolyte-silicate composites.

Guntram Schwarz, Stefan Maisch, Stefan Ullrich

    ACS Applied Materials & Interfaces
    |May 8, 2013
    PubMed
    Summary

    This study introduces novel electrorheological fluids (ERF) using metallo-supramolecular polyelectrolytes in silica. These advanced ERFs show significant solidification under electric fields with reduced material usage.

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    Published on: February 6, 2016

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    Last Updated: May 11, 2026

    Dielectric RheoSANS — Simultaneous Interrogation of Impedance, Rheology and Small Angle Neutron Scattering of Complex Fluids
    07:51

    Dielectric RheoSANS — Simultaneous Interrogation of Impedance, Rheology and Small Angle Neutron Scattering of Complex Fluids

    Published on: April 10, 2017

    Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites
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    Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites

    Published on: February 6, 2016

    Area of Science:

    • Materials Science
    • Supramolecular Chemistry
    • Rheology

    Background:

    • Electrorheological fluids (ERFs) are smart materials whose viscosity changes under an electric field.
    • Conventional ERFs often require high concentrations of active materials and can suffer from high current leakage.
    • Developing ERFs with enhanced performance and efficiency is crucial for advanced applications.

    Discussion:

    • A new ERF concept utilizes rigid-rod metallo-supramolecular polyelectrolytes (MEPE) within mesoporous SBA-15 silica.
    • The intercalation of MEPE in SBA-15 enhances their interaction and response to applied electric fields.
    • Silicone oil serves as the base fluid, allowing for effective dispersion and measurement.

    Key Insights:

    • Rheological measurements demonstrate a significant increase in storage modulus upon electric field application, indicating fluid solidification.
    • The developed MEPE-SBA-15 composite exhibits a strong electrorheological effect with low current densities.
    • Notably, the required amount of MEPE is five times lower compared to similar host-guest ERF systems.

    Outlook:

    • Further research could explore variations in MEPE structure and silica hosts to optimize ERF performance.
    • Investigating the long-term stability and durability of these composites is essential for practical applications.
    • The findings pave the way for more efficient and cost-effective electrorheological fluid technologies.