Particle Measurement

Dynamic Light Scattering

The size reduction of materials plays a central role for the development of innovative products. Applications based on nanoparticles can lead to advances in the improvement of properties and functionalities of disperse systems. For fine tuning of their properties and to study the functionality in its natural environment, reliable and efficient technologies and appropriate measuring instruments are required.

The principle of dynamic light scattering is used for the nanoparticle characterization basing on the acquisition of scattered light intensities of particles under thermal motion. The method known as Photon Correlation Spectroscopy (PCS) applies auto‐correlation of scattered light intensities in order to determine particle size distribution. However, this conventional technology requires extremely diluted samples in order to deliver meaningful results.

By applying an innovative light scattering technique using Photon Cross-Correlation Spectroscopy (PCCS) with NANOPHOX we are able to provide concurrent measurements of particle size and stability in opaque suspensions and emulsions. The outstanding technological feature of NANOPHOX is the acquisition of two separately induced scattered light intensities which then are cross‐correlated. The single scattered light proportion is thus separated from the multiple scattered part. Therefore the size analysis is independent of concentration and masters high concentrations up to approximately 20 % by volume. Using a 30 mW semiconductor laser and Avalanche photo diodes minimum sample concentrations of just 10-4 % by volume are measurable. This remarkably broad concentration range is possible due to the combination of PCS and PCCS in a single instrument.

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Dynamic light scattering sensor

NANOPHOX | Particle size analysis and stability of nano suspensions in laboratory

NANOPHOX brings photon cross-correlation spectroscopy (PCCS) to life, which allows for size analysis of nanoparticles in turbid suspensions and emulsions ranging from 0.5 nm to 10,000 nm at high solid contents. In addition, aggregation, agglomeration and stability of nano-suspensions and emulsions may be analysed. Typical applications comprise e.g., pharmaceutical ingredients, pigments and research on nanomaterials in general.

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