Nanometre particle sizing and stability measurement using a table-top PCCS system

摘要

The characteristics of many modern materials are often determined by the properties of nano-particles.This fact is responsible for the fast-growing demand for analysis and control of particle size.The most widely-used technique for this is photon correlation spectroscopy (PCS),which has been in use for almost 30 years now.Despite its popularity,PCS however suffers from the disadvantage that it can only be applied to highly diluted samples.A recent development,known as photon cross-correlation spectroscopy or PCCS,has dramatically extended the power of the original tech-nique and enables reliable measurements even in high con-centration suspensions.This article describes the theory and applications of PCCS and also the practical embodiment of the technique,namely the new NANOPHOX instrument from the Sympatec company.