Related Experiment Video
Updated: Jun 8, 2026
10:56
Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
Published on: May 20, 2014
Aging dynamics of colloidal hard sphere glasses.
V A Martinez1, G Bryant, W van Megen
1Department of Applied Physics, Royal Melbourne Institute of Technology, Melbourne, Victoria 3000, Australia.
The Journal of Chemical Physics
|September 28, 2010
Summary
Colloidal hard sphere glasses exhibit a power law approach to aging, with the coupling between fast and slow decays decreasing algebraically over time. This indicates that even rapid processes within these systems are nonstationary.
Area of Science:
- Soft Matter Physics
- Materials Science
- Glass Transition Physics
Background:
- Understanding the dynamics of glassy systems is crucial for materials science.
- Colloidal hard sphere glasses serve as a model system for studying glass transition phenomena.
Purpose of the Study:
- To investigate the dynamics of colloidal hard sphere glasses using dynamic light scattering.
- To quantify the aging process and its effect on the intermediate scattering function (ISF).
Main Methods:
- Dynamic light scattering (DLS) measurements.
- Analysis of the coherent intermediate scattering function (ISF).
- Characterization of aging through various quantitative methods.
Main Results:
- Observed a clear crossover in the ISF from fast to slow nonstationary decay.
- Demonstrated that the approach to an aged glass state follows a power law.
- Found that the coupling between fast and slow decays decreases algebraically with waiting time.
Conclusions:
- The aging process in colloidal hard sphere glasses is characterized by power-law dynamics.
- The nonstationary nature of the coupling implies that dynamics are time-dependent even at fast timescales.
Related Concept Videos
01:29The 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...
01:17Colloids and Suspensions
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
03:22Colloids
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
01:09Colloidal 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...
01:23Factors Affecting Dissolution: Particle Size and Effective Surface Area
Dissolution kinetics, an essential aspect of oral drug delivery, is significantly influenced by the drug's particle size. According to the Noyes-Whitney dissolution model, the dissolution rate correlates directly with the drug's surface area. The larger the surface area, the higher the drug's solubility in water, leading to a faster drug dissolution rate. Reducing particle size increases the effective surface area, enhancing the dissolution process. Micronization and nanosizing are employed to...
02:54Molecular and Ionic Solids
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...