Light scattering goniometers are specialized instruments used to measure the angular distribution of scattered light from a sample. They are essential tools in various fields such as materials science, biophysics, chemistry, and optics for characterizing properties like particle size, shape, and structural organization.
How Light Scattering Goniometers Are Used:
Setup of the Instrument:
- The sample is placed at the center of the goniometer.
- A light source (often a laser or a collimated beam) directs a beam at the sample.
- Detectors are mounted on a rotational arm (goniometer arm) that can move around the sample to measure scattered light at different angles.
Illumination and Measurement:
- The incident light illuminates the sample.
- As the light interacts with the sample, it scatters in various directions.
- The detector measures the intensity of scattered light at specific angles relative to the incident beam for static light scattering (SLS) measurements, in which case this angular scattering pattern provides information about the sample’s structure.
- In addition, a dynamic light scattering (DLS) measurement may be taken at each angle by incorporating a process known as autocorrelation to calculate a particle size from measured translational diffusion measurements.
Analysis:
The collected scattering intensities are analyzed to determine parameters like:
- Particle size distribution
- Shape and morphology
- Degree of aggregation or ordering
Applications:
- Characterizing colloids and nanoparticles
- Studying biological macromolecules (e.g., proteins, DNA)
- Investigating materials’ surface properties
- Understanding structural organization in complex fluids
Summary:
Light scattering goniometers are used to measure how light is scattered by a sample at different angles, providing detailed insights into the sample’s microscopic and structural properties. They are crucial for non-destructive, precise characterization of materials and biological specimens.
Brookhaven Instruments’ scientists have extensive experience in the development of instruments and methods for light scattering. This experience has been incorporated into the BI-200SM Research Goniometer to make it the finest instrument available for research applications of light scattering.
Contact us today to learn more.