Stability Analysis of Emulsions and Suspensions with Photon Cross-correlation Spectroscopy
The well established Photon Correlation Spectroscopy (PCS)probes the Brownian motion of colloidal particles,thus allowing the determination of their particle size distribution(PSD).The theory behind is valid for single scattered light only.Therefore PCSis ilmited to ver low particle concentrations.A cross correlation setup1guarantees that only single scattered light contributes to the measured cross-correalation function.Hence Photon Cross-Correlation Spectroscopy(PCCS),overcomes the concentration restrictions of the PCS.A 3D-Cross-correlation setup2can be realised in an easy-to-handle instrument that is capable of measuring the PSDof opaque nanosized suspensions and emulsions. Cross-correlation is a filter for single scattered light and the intercept of the measured cross-correlation function is proportional to the ration of single and multiple scattered light.Multiple scattering is closely connected to the absolute number of particles.Therefore,the intercept of the cross-correlation function is very sensitive to changes of the number of particles due to agglomeration,nucleation of desagglomeration.Combined with the estimated PSD the intercept of the cross-correlation function is a good indicator for changes within the sample giving an additional benefit for the user. The measurement technique as well as selected applications are presented.Special emphasis will be placed on the stability anslysis of suspensions and emulsions.
Helmut Geers Wolfgang Witt Frank Babick
Sympatec GmbH,System-Partikel-lechnik,Clausthal-Zellerteld,Germany Institut fur Verfahrenstechnik und Umwelttechnik,Arbeitsgruppe Mechanische Verfahrenstechnik,Technis
国际会议
成都
英文
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）