Related Experiment Video
Updated: Feb 8, 2026
04:40
Dynamic Light Scattering Analysis for the Determination of the Particle Size of Iron-Carbohydrate Complexes
Published on: July 7, 2023
3.2K
Role of Particle-Particle Interaction Towards Effective Interpretation of Z-Average and Particle Size Distributions
Journal of Nanoscience and Nanotechnology
|June 30, 2018
Summary
Particle-particle interactions significantly impact Dynamic Light Scattering (DLS) particle size analysis. Understanding these interactions is crucial for accurate interpretation of Z-average and size distributions, especially for aggregating nanoparticles.
Area of Science:
- Materials Science
- Analytical Chemistry
- Physical Chemistry
Background:
- Dynamic Light Scattering (DLS) is a widely used technique for particle sizing.
- Interpreting DLS data, particularly Z-average and various size distributions, can be challenging due to particle interactions.
- The influence of particle-particle interactions on DLS data interpretation requires further investigation.
Purpose of the Study:
- To investigate the role of particle-particle interactions in the interpretation of DLS-derived Z-average and particle size distributions (intensity-weighted, volume-weighted, number-weighted).
- To compare DLS results with Transmission Electron Microscopy (TEM) under varying interaction conditions.
- To assess the impact of particle concentration on DLS measurements and analyze particle aggregation kinetics.
Main Methods:
- Dynamic Light Scattering (DLS) measurements were performed on silica (SiO2) and iron oxide (Fe3O4) nanoparticles.
- Transmission Electron Microscopy (TEM) was used for comparative particle size analysis.
- Particle concentration was varied to study its effect on DLS measurements.
- Particle aggregation kinetics were studied using three independent case studies.
Main Results:
- For weakly interacting SiO2 particles, DLS Z-average closely matched TEM results.
- For strongly interacting Fe3O4 particles, DLS Z-average was approximately 10 times larger than TEM results.
- Particle size distributions varied significantly for aggregating Fe3O4 particles, complicating interpretation.
- Z-average of Fe3O4 particles showed significant dependence on measurement concentration.
- Intensity-weighted distribution provided more consistent aggregation kinetic trends than volume- or number-weighted distributions.
Conclusions:
- Particle-particle interactions critically affect DLS Z-average and size distribution interpretation.
- Accurate DLS analysis requires consideration of particle stability and interaction effects.
- Intensity-weighted size distribution is more suitable for tracking aggregation kinetics in polydisperse systems.
Related Concept Videos
02:10The Nucleosome Core Particle
14.5K
Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
14.5K
01:12The Nucleosome Core Particle
2.4K
Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...
2.4K
03:37Subatomic Particles
113.5K
Dalton was only partially correct about the particles that make up matter. All matter is composed of atoms, and atoms are composed of three smaller subatomic particles: protons, neutrons, and electrons. These three particles account for the mass and the charge of an atom.
113.5K
02:43Basic Postulates of Kinetic Molecular Theory: Particle Size, Energy, and Collision
37.9K
The ideal-gas equation, which is empirical, describes the behavior of gases by establishing relationships between their macroscopic properties. For example, Charles’ law states that volume and temperature are directly related. Gases, therefore, expand when heated at constant pressure. Although gas laws explain how the macroscopic properties change relative to one another, it does not explain the rationale behind it.
37.9K
01:23Factors Affecting Dissolution: Particle Size and Effective Surface Area
1.7K
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...
1.7K
01:16Precipitate Formation and Particle Size Control
6.9K
In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
6.9K