Measurement using dynamic light scattering

Fig. 2 Different Particle Size Distributions measured using Dynamic Light Scattering...

Fig. 10 (a) Size distribution of curcumin-loaded dextran sulfate-chitosan nanoparticles, as measured using dynamic light scattering, (b) AFM image of curcumin-loaded dextran sulfate-chitosan nanoparticles, (c, d) SEM images of curcumin-loaded dextran sulfate-[Pg.180]

Micelle hydrodynamic diameters are measured using dynamic light scattering with a Coulter N4 nanosizer. The analyses are performed at scattering angle of 90° at 20°C (Zhang et al. 2004). Mean diameters are calcnlated according to the formula ... 

Close to the phase transitions point (such as the weak first-order isotropic to nematic transition or the second-order nematic to smectic transition), the order of the low-temperature phase occurs transiently in the finite small size of fluctuations, which is called cybotactic clusters. When the correlation length of the fluctuation increases towards the transition point, the relaxation time diverges. For example, near the nematic-smectic phase transition point, it can be seen that the correlation length becomes longer towards the transition point by X-ray diffraction experiments (Fig. 10.21). In addition, the increase of the relaxation time of the fluctuations can be measured using dynamic light scattering method, which wiU be introduced in detail in Sect. 10.4.3.2. 

Alternatively, if the hydrodynamic diameter (%) of the aggregates is measured, using dynamic light scattering, as a function of time (t), then, under certain conditions, (Asnaghi etal, 1992) the following relationship holds ... 

Measurements of hydrodynamic radius (Rh) and intrinsic viscosity [in] of PVP in Na2SC>4 (0.55 M) have been performed by using Dynamic Light Scattering (DLS) and viscometry. From these results, a coil - to - globule phase transition was detected. 

The particle size of complexes was measured by dynamic light scattering, and the overall charge by zeta potential measurements, using a particle analyzer (Zetamaster, Malvern Instrnments, Spain). 

The particle size was determined using dynamic light scattering (also termed photon correlation spectroscopy PCS), using a Malvern PCS instrument. The equilibrium sediment and cream volumes were recorded using measuring cylinders at room temperature, and viscoelastic measurements were made using a Bohlin VOR rheometer. 

When assessing a nanoemulsion formation, the normal approach is to measure the droplet size distribution using dynamic light scattering techniques, including photon correlation spectroscopy (PCS). In this technique, the intensity fluctuation of light scattered by the droplets is measured as they undergo Brownian motion... 

Using dynamic light-scattering measurements [Jamieson et al, 1996], Syi was determined for nematic solutions of a SCLCP, which had a weakly prolate or oblate conformation (i.e., R /R l), based on ER measurements of Sr]b and Srjc, and indicated [Liu et al, 1999] that Syi ckTtR/N, whereas the Brochard model predicts [via Eq. (1.95)] that Syi 0. 

In order to perform the measurements of the anchoring energy coefficients described in the previous subsection, the orientational fluctuation relaxation time needs to be determined as a function of sample thickness. This can be best done using dynamic light scattering. 

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