Measurement of inorganic particle size using dynamic light scattering method.

Dynamic light scattering allows for the measurement of particle size and size distribution without separating nanoparticles dispersed in a liquid.
Here, we present examples of particle size measurement for silica and alumina particles in an aqueous medium.
Particles in a solution exhibit Brownian motion that depends on their size, and the fluctuations of the scattered light generated when the particles are illuminated depend on their size. By observing and analyzing these fluctuations, we can determine the particle size and size distribution.
[Alumina Measurement Results and Discussion]
- As alumina approaches neutrality from strong alkaline conditions, it nears its isoelectric point.
- The surface charge of the particles decreases.
- The repulsion between particles diminishes.
- Evidence of particle aggregation can be observed.
[Silica Measurement Results and Discussion]
- It is believed that the isoelectric point is on the strong acidic side.
- In the pH range of 3 to 10, no particle aggregation occurs.
- Particle sizes are maintained below 50 nm.

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