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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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The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...

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Related Experiment Video

Updated: Jun 27, 2026

Writing and Low-Temperature Characterization of Oxide Nanostructures

Writing and Low-Temperature Characterization of Oxide Nanostructures

Published on: July 18, 2014

Low Thermal Conductivity and Diffusivity at High Temperatures Using Stable High-Entropy Spinel Oxide Nanoparticles.

Ka Man Chung¹, Sarath R Adapa², Yu Pei²

¹Program in Materials Science and Engineering, University of California, San Diego, La Jolla, CA, 92093, USA.

Advanced Materials (Deerfield Beach, Fla.)

|December 27, 2024

Summary

This summary is machine-generated.

Researchers developed a novel porous solid thermal insulation material using high-entropy spinel oxide nanoparticles. This material achieves exceptionally low thermal conductivity at high temperatures, enabling advanced heat management solutions.

Keywords:

high entropy oxide high temperature spinel oxide thermal diffusivity thermal insulation

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Last Updated: Jun 27, 2026

Writing and Low-Temperature Characterization of Oxide Nanostructures

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Published on: July 18, 2014

Synthesis of Non-uniformly Pr-doped SrTiO3 Ceramics and Their Thermoelectric Properties

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Published on: August 15, 2015

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

Published on: May 29, 2018

Area of Science:

Materials Science
Nanotechnology
Thermal Engineering

Background:

High-temperature thermal insulation is crucial for energy efficiency and safety in various industrial applications.
Existing materials often degrade or lose effectiveness at elevated temperatures.
Developing stable, high-performance insulation for extreme conditions remains a significant challenge.

Purpose of the Study:

To report the development of a porous solid thermal insulation material with low thermal conductivity at high temperatures.
To investigate the use of stable packed nanoparticles of high-entropy spinel oxide with 8 cations (HESO-8 NPs) for this purpose.
To understand the mechanisms behind the observed thermal properties.

Main Methods:

Fabrication of porous solid thermal insulation using packed high-entropy spinel oxide nanoparticles (HESO-8 NPs) at ≈50% packing density.
Measurement of thermal conductivity and thermal diffusivity at high temperatures (up to 800 °C) in ambient air.
Analysis of heat transfer mechanisms (solid conduction, gas conduction, thermal radiation) and microstructural stability.

Main Results:

Achieved a low thermal conductivity of 0.11 W m⁻¹ K⁻¹ at 800 °C in ambient air.
Demonstrated significantly reduced thermal diffusivity (≈1000-fold lower than air) in high-density HESO-8 NP pellets.
Suppressed all three modes of heat transfer through nanoconstriction and infrared absorption by HESO-8 NPs.
Observed remarkable microstructural stability against coarsening at high temperatures due to high entropy.

Conclusions:

High-entropy ceramic nanostructures offer a promising pathway for next-generation high-temperature thermal insulation.
The HESO-8 NPs exhibit excellent thermal insulation properties due to suppressed heat transfer and high-temperature stability.
This research provides insights into designing advanced thermal management materials for extreme environments.