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The Colloidal State

The Colloidal State

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...

Polymer Classification: Crystallinity

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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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...

The Seven Crystal Systems: Overview

The Seven Crystal Systems: Overview

Crystals with various point group symmetries belong to different crystal classes, which are synonymous terms. Despite being in the same class, crystals may have distinct shapes, like cubes and octahedra. There are 32 three-dimensional point groups, all of which are systematically divided into seven crystal systems.The basic cubic crystal system, exemplified by NaCl, features orthogonal vectors (α = β = �� = 90°) of equal lengths (a = b = c). When specific requirements are not imposed on the...

Ionic Crystal Structures

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...

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Related Experiment Video

Updated: Jul 3, 2026

Synthesis and Characterization of Supramolecular Colloids

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Orientationally correlated colloidal polycrystals without long-range positional order.

Cristina Arcos¹, Kitty Kumar, Wenceslao González-Viñas

¹Department of Physics and Physical Oceanography, Memorial University, St. John's, NL, Canada A1B 3X7.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|July 23, 2008

Summary

Spin-coated colloidal crystals exhibit unique 3D structures with controllable symmetries. These polycrystals, while limited for photonics, serve as templates for creating crack-free magnetic patterns.

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Colloidal crystals are model systems for studying phase transitions and material properties.
Understanding the structure-property relationships in colloidal films is crucial for developing new materials.

Purpose of the Study:

To investigate the local and global structure of spin-coated colloidal crystals.
To determine the influence of processing parameters on crystal structure and symmetry.
To explore potential applications of these colloidal films.

Main Methods:

Laser diffraction measurements
Scanning electron microscopy (SEM)
Atomic force microscopy (AFM)

Main Results:

Identified unique three-dimensional orientationally correlated polycrystals.
Observed short-range positional order and long-range radial orientational correlations.
Demonstrated control over film thickness and symmetries via solvent choice and spin speed.
Found polycrystallinity limits photonic applications but enables templating for magnetic patterns.

Conclusions:

Spin-coated colloidal films are complex polycrystals with tunable properties.
These materials show promise as templates for fabricating magnetic patterns.
Further research can optimize these structures for specific applications.