SciMed Education
Characterization of Cerium Oxide Nanoparticles Using Vasco Kin
In Summary
Dynamic light scattering (DLS) using the Vasco Kin instrument enables fast and accurate characterisation of cerium oxide (CeO₂) nanoparticles in suspension. In this study, DLS measurements provided a clear size distribution with a primary nanoparticle population around 6.4 nm and a secondary population between 20 and 80 nm corresponding to aggregates. The results closely matched transmission electron microscopy observations, demonstrating the accuracy and resolution of the Vasco Kin for nanoparticle analysis.
What are cerium oxide nanoparticles and why is their size important?
Cerium oxide (CeO₂) nanoparticles are widely studied materials due to their unique chemical and catalytic properties. These nanoparticles are commonly used in fields such as catalysis, fuel additives, environmental remediation and advanced materials research.
Because many of their properties depend strongly on particle size and surface area, accurate particle size characterisation is essential. Understanding the size distribution of nanoparticles in suspension helps researchers evaluate sample quality, aggregation behaviour and stability.
Techniques such as dynamic light scattering allow scientists to measure nanoparticle size quickly and reliably without complex sample preparation, making them ideal for routine analysis.
What materials and sample preparation were used for cerium oxide nanoparticle analysis?
The sample analysed in this study consisted of a colloidal suspension of cerium oxide nanoparticles in water with a concentration of 30 g/L. Prior to analysis, the suspension was filtered through a 0.2 µm polyethersulfone (PES) filter in order to remove larger particles or contaminants that could influence the measurement.
Before performing the dynamic light scattering analysis, the nanoparticles were also examined using transmission electron microscopy (TEM). A small volume of the suspension (5 µL) was dried onto a TEM grid to observe the particle morphology and structure.
TEM imaging revealed that the cerium oxide nanoparticles were not perfectly spherical, as they were composed of small crystallites. From these observations, the average particle diameter was estimated to be approximately 6.6 ± 2.0 nm. In addition to the primary nanoparticles, some aggregates in the range of 20 to 50 nm were also detected on the TEM grid.
How does dynamic light scattering (DLS) measure cerium oxide nanoparticle size?
Dynamic light scattering (DLS) is a widely used technique for measuring the size of nanoparticles suspended in liquids. The technique works by analysing fluctuations in the intensity of light scattered by particles undergoing Brownian motion. These fluctuations are related to the diffusion speed of the particles, which can then be converted into a hydrodynamic diameter.
In this study, the DLS measurements were performed using the Vasco Kin instrument equipped with its in situ optical head. The measurements were conducted in a quartz cuvette at room temperature.
The recorded correlograms were analysed using the Sparse Bayesian Learning (SBL) inversion algorithm, which allows highly resolved particle size distributions to be calculated. This algorithm is particularly effective when analysing samples that contain more than one particle population, enabling the accurate identification of both monomodal and multimodal distributions.
What were the results of the cerium oxide nanoparticle size measurements?
The Vasco Kin system produced a reliable measurement in less than 10 seconds, demonstrating the speed and efficiency of the technique for nanoparticle characterisation.
The size distribution obtained from the dynamic light scattering measurement revealed a main population with a hydrodynamic diameter of 6.4 ± 0.2 nm, which closely matches the particle size determined by transmission electron microscopy.
In addition to this primary population, the DLS analysis also detected a secondary particle population between 20 and 80 nm. This second population corresponds to aggregates that were previously observed in the TEM images.
The agreement between the DLS and TEM results confirms the reliability of the Vasco Kin measurements and demonstrates the instrument’s ability to detect both individual nanoparticles and aggregated particles within the same sample.
Why is the Vasco Kin suitable for in-situ Dynamic Light scattering (DLS) nanoparticle size characterisation?
The results of this study demonstrate that the Vasco Kin provides highly accurate measurements of very small nanoparticles such as cerium oxide. Its ability to detect multiple particle populations within a suspension makes it particularly useful when analysing samples that contain both primary particles and aggregates.
Another advantage of the Vasco Kin system is the extremely fast acquisition time, allowing reliable size measurements to be obtained in just a few seconds. This rapid analysis makes the instrument suitable for routine laboratory workflows, research applications and quality control processes where fast and reliable particle size measurements are required.
The combination of dynamic light scattering technology, an in situ optical head and advanced SBL data processing provides high resolution particle size distributions, enabling researchers to characterise complex nanoparticle suspensions with confidence.
What to do Next?
Mixing calorimetry provides valuable insight into the thermodynamic and kinetic behaviour of chemical interactions, including dissolution, adsorption and reaction processes. Instruments such as the MicroCalvet calorimeter enable researchers to measure these heat effects with exceptional sensitivity and precision.
If you would like to learn more about how mixing calorimetry can support your research or analytical applications, explore the MicroCalvet system below or contact the SciMed team for further guidance.
Page FAQ's
Dynamic light scattering is a technique used to measure the size of particles suspended in a liquid. It analyses fluctuations in scattered light caused by Brownian motion and converts this information into a hydrodynamic particle diameter.
The main nanoparticle population had a hydrodynamic diameter of approximately 6.4 nm, while a secondary population between 20 and 80 nm corresponded to aggregates within the sample.
A reliable dynamic light scattering measurement using the Vasco Kin instrument can be obtained in less than 10 seconds, making it a very fast method for nanoparticle analysis.
The particle size distribution was calculated using the Sparse Bayesian Learning (SBL) inversion algorithm, which provides high resolution size distributions and allows accurate identification of multiple particle populations.
Two populations were observed because the suspension contained both individual cerium oxide nanoparticles and larger aggregates formed by clusters of particles. Dynamic light scattering was able to detect both populations within the same measurement.
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