While Laser Diffraction (LD) often reaches its limits for particles smaller than 100 nm due to the weak signal and the low angular variance in scattering signal, this is where the strength of dynamic light scattering lies. The proposed approach in combination with the developed phenomenological model describing the relationship between the average speckle lifetime and the current values of the foam volume, as well as its first-time derivative made it possible to interpret the features of foam structure formation. Dynamic light scattering enables the analysis of particles in a size range from 0.3 nm to 10000 nm. This makes it possible to relate this parameter to microscopic mobility of interphase boundaries in the foam in the absence of a priori information on the law of motion relating these boundaries at the microscopic level. DLS is based on the determination of the diffusion coefficient of particles freely moving in a fluid, a task that can be tackled by measuring the auto- or cross. It was found that, in contrast to the commonly used correlation time of intensity fluctuations, the values of the average speckle lifetime are invariant with respect to the type of dynamics of phase fluctuations of partial components in scattered radiation. This article explains the workings of the technique, the method of measurement and the interpretation of the data as well as some applications of DLS. Whether you are a new or advanced user of light scattering solutions, we will answer all your questions. Intensity fluctuations of scattered laser radiation in the course of foam expansion were analyzed using ensemble-averaged estimates of the speckle lifetime within a running window in the time domain. This is the principle of the dynamic light scattering (DLS) technique, formerly called quasi-elastic light scattering (QELS) or photon correlation spectroscopy (PCS). ZetaClass is a comprehensive webinar series on dynamic and electrophoretic light scattering where our experts walk you through the basic measuring principles, data interpretation and tests performed to gauge data quality. Polylactide foaming as the key stage in laboratory preparation of highly porous biocompatible matrices used as scaffold prototypes was monitored based the effect of dynamic light scattering in expanding polylactide foams. Light Scattering Theories Rayleigh Scattering If the particles are small compared to the wavelength of the laser used (typically less than d 10 or around 60nm for a He-Ne laser), then the scattering from a particle illuminated by a vertically polarised laser will be essentially isotropic, i.e.
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