Determination by photon correlation spectroscopy of particle size distributions in lipid vesicle suspensions

Determination of size / shape parameters of colloidal ellipsoids by photon correlation spectroscopy 1

The usefulness of photon correlation spectroscopy (PCS) for the determination of particle size in colloidal suspensions is well established. Most PCS experiments measure the time correlation function of polarized scattered light. However, if the scattered light is depolarized, dynamic and structural information on the dispersed particles can be made available, which is difficult to obtain by ot...

Repeptization Determined by Turbidity and Photon Correlation Spectroscopy Measurements: Particle Size Effects

The aggregation of four polystyrene latexes with similar surface charge and different diameter has been examined by small angle light scattering. The DLVO model including aggregation at the secondary minimum qualitatively agrees with the experimental dependence of colloidal stability on particle size. Repeptization experiments, where the flocs were redispersed by washing away the coagulating sa...

Photon Correlation Spectroscopy

Velocity fluctuations in fluidized suspensions probed by ultrasonic correlation spectroscopy

Velocity fluctuations in a fluidized suspension of particles are investigated using two new ultrasonic correlation spectroscopies: diffusing acoustic wave spectroscopy and dynamic sound scattering. These techniques probe both the local strain rate and rms velocity of the particles, providing important information about the spatial extent of velocity correlations. Our results demonstrate the pow...

Lipid--protein interactions revealed by two-photon microscopy and fluorescence correlation spectroscopy.

Cellular processes involve a multitude of chemical reactions that must be kept in delicate equilibrium to maintain cellular homeostasis. Powerful biophysical techniques are needed to measure the localization and concentration of target molecules as well as to quantify complex molecular processes in model and in vivo systems. Two-photon microscopy and fluorescence correlation spectroscopy (FCS) ...