2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Nanometre particle sizing and stability measurement with tabletop PCCS

W. Laemmle
Sympatec GmbH, DE

PCCS, particle sizing, stability, measurement, tabletop

Modern materials very often derive their properties from nano-particles. This implements a fast growing demand for control of particle size in this field. The most popular technique to do so is PCS, photon correlation spectroscopy. PCS is known for about 30 years but is limited to highly diluted samples all the time. The new instrument of Sympatec called NANOPHOX is able to measure reliably even in suspension of high concentration using recent PCCS. A new set-up using Photon-Cross-Correlation-Spectroscopy (PCCS) was thought of by : Schätzel (Uni Kiel + Mainz), Overbeck et al. (Uni Mainz), Urban et. al. (ETH Zürich) and Aberle et. al. (Uni/FhG Bremen) Such a set-up enables to receive two results that are identical with respect to the single scattered light but differ in noise as well as in multiple-scattered-information collected along its different ways through the sample. A cross correlation of the two results is able to act as a filter that extracts the single scattered light only. This for the first time guaranties that at what concentration ever the influence of noise and multiple scattering can be avoided reliably and completely.

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