Dynamic light scattering (DLS)
Dynamic light scattering (DLS) measures particle sizes and aggregation by analyzing fluctuations in light intensity. This non-destructive method enables rapid particle size determination in various samples.
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Dynamic light scattering (DLS)
Dynamic light scattering (DLS) measures particle sizes and aggregation by analyzing fluctuations in light intensity. This non-destructive method enables rapid particle size determination in various samples.
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Guide and selection support
Dynamic light scattering (DLS) is used to accurately determine particle size distributions and aggregation states in liquids. Typical applications include process development, quality control, and research, where particle size and diffusion coefficients are relevant.
The choice of a DLS instrument depends on factors such as sample type, required sample volume, measurement accuracy, and automation options. Compatibility with different sample types and the ability to reliably detect concentrations and size distributions are also important.
LabFinder provides a clear overview of dynamic light scattering product variants, supports the selection of suitable systems, and simplifies procurement through detailed product data and technique-specific information.
Applications and Benefits
Dynamic light scattering (DLS) is used to determine particle size distribution, analyze aggregation, and measure particle concentrations in liquid samples. The technique is based on analyzing time-dependent fluctuations of scattered light intensity, which are used to determine the translational diffusion coefficient. This allows calculation of the hydrodynamic radius of the particles. Measurement is non-destructive and requires only a small sample volume. Typical measurement times are under 30 seconds.
DLS is primarily used in process development, quality assurance, and research for rapid and reliable monitoring of changes in particle size or aggregation processes.
Selection Criteria
Several aspects should be considered when selecting DLS devices: required sample amount and type, measurement range for particle size and concentration, user-friendliness, as well as automation and evaluation options. It is also important to know whether the device can reliably analyze polydisperse systems or complex media.
The availability of software for data analysis and report generation may also play a role, depending on the application scenario and laboratory requirements.
Variants and Measurement Principles
DLS relies on measuring temporal fluctuations in scattered light caused by Brownian motion of small particles in suspension. This results in the determination of the translational diffusion coefficient, which is then converted into the hydrodynamic radius. Devices differ by laser wavelength, detector configuration, sample holders, and data analysis algorithms.
Some instruments feature automatic sample feeding or multi-spectral measurements to expand the scope and depth of analyses.
Calibration and Maintenance
For accurate results, regular calibration with appropriate standard particles is recommended to ensure measurement accuracy and reproducibility. Maintenance usually involves cleaning the sample cells and checking laser performance. Since measurement is physically direct, extensive method training is not necessary.
Limitations
DLS is best suited for homogeneous particle systems up to certain size and concentration limits. Highly polydisperse samples or highly concentrated suspensions may complicate or distort measurements. Opaque or highly light-absorbing media are also only partially measurable.
Comprehensive characterization of complex systems often requires complementary methods.
Search Terms and Related Terms
Search terms to quickly find DLS products include: dynamic light scattering, particle size distribution, hydrodynamic radius, diffusion coefficient, light scattering analysis, particle concentration, aggregation analysis, and non-destructive measurement.
Also known as
Dynamic Light Scattering
Dynamic particle size analysis
Zetasizer
Dynamic light scattering analysis
Dynamic scattering measurement
Molecular diffusion measurement
Hydrodynamic radius measurement
DLS particle size determination
Aggregation analysis light scattering
Dynamic scattering
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Frequently asked questions
How does dynamic light scattering (DLS) work?
DLS measures the temporal fluctuations in the intensity of light scattered by particles due to their Brownian motion. From this, the diffusion coefficient is determined, which is then used to calculate the hydrodynamic radius.
What particle size ranges can DLS detect?
The DLS method is suitable for particles in the nanometer to submicron range, typically from about 1 nm up to 1 µm, depending on the device and sample type.
What criteria are important when selecting a DLS instrument?
Important selection criteria include sample volume, particle size range, measurement accuracy, sample type, ease of use, and available evaluation software.
Can DLS be used with complex or highly concentrated samples?
For highly concentrated or strongly polydisperse samples, measurement results may be less reliable. Complementary methods may be useful in such cases.
How long does a typical DLS measurement take?
A DLS measurement usually takes less than 30 seconds per sample, allowing for fast analysis.
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