Particle size determination dynamic light scattering

FIGURE 1 Effect of (sequential) extrusion of MLV dispersions through polycarbonate membrane filters (Unipore) with pore sizes of 1.0, 0.6, 0.4, 0.2, and 0.1 ym on the mean liposome diameter. DXR-containing MLV (phosphatidylcholine/phosphatidylserine/ cholesterol 10 1 4) mean diameter of nonextruded dispersion about 2 ym pH 4. Mean particle size determined by dynamic Light scattering (Nanosizer, Coulter Electronics). (From Crommelin and Storm, 1987.)... 

Fig. 4 PIC dye nanoparticles prepared by the ion-association method. (1) Particle size distributions (determined by the dynamic light scattering technique) and the corresponding electron micrographs of the dye nanoparticles. The average diameter can be controlled by tuning the molar ratio of TPB- to PIC+ (=[TPB-]/[PIC+]. With an increase in the molar ratio, the average diameter decreased. (2) Absorption spectra of PIC nanoparticles in aqueous solution with different sizes (125 and 64 nm in diameter), exhibiting size-dependent peak shift of the 0-0 band. The spectrum of the aqueous PIC-Br monomer solution is also shown...

Thomas J.C., The determination of log normal particle size distributions by dynamic light scattering, J. Colloid Interface Sci., 117, 187, 1987. 

The final section (Section 5.8) introduces dynamic light scattering with a particular focus on determination of diffusion coefficients (self-diffusion as well as mutual diffusion), particle size (using the Stokes-Einstein equation for the diffusion coefficient), and size distribution. 

Dynamic light scattering may be used to determine the particle size distribution or molecular weight distribution In a wide variety of applications. See ref. (1) for discussion of this literature. 

The size distribution of solid samples can be determined by static and dynamic light-scattering techniques the size ranges from a few nanometers to a few microns. The concept uses the idea that small particles in a suspension move in a random pattern called Brownian motion. When the moving particles are irradiated by a... 

Dynamic light scattering (DLS) is most commonly used to determine the average size of colloidal particles. Normally, this application requires sample dilu-... 

Dynamic light scattering is a powerful tool to determine the size, the size distribution, and the shape of the particles in suspension. Theoretical and experimental aspects of this technique are available in standard monographs 129-31],... 

One of the practical applications of dynamic light scattering involves the determination of particle sizes in media dispersed as dilute suspensions in a liquid phase. This aspect of dynamic light scattering is the focus here. Analysis of the scattering data will yield the translational diffusion constant D for a dilute aqueous suspension of polystyrene spheres, and this is directly related to the radius of the spheres. In addition, scattering will be studied from dilute skim milk, which reveals that a distribution of particle sizes exists for this system. 

Babick et.al. [261] compare sound spectroscopic determination of particle size distributions of sub-micron emulsions with dynamic light scattering and laser diffraction using olive oil in water droplet suspensions at volume concentrations from 1% to 60%. 

Dynamic light scattering (DLS) (model B1-9000AT, Brookhaven Instrnments Corp., Holtsville, NY) was nsed to estimate the particle size and particle size distribution of the resulting BT powders. The samples were dilated with deionized water and ultrasonicated for 15 min jnst before the size analysis. Room temperature XRD (Scintag PAD V using CnKa with X = 0.15406 nm) was nsed for crystalline phase identification and determination of the crystallite size of the powder. The crystallite size of BaTiOj powders was calcnlated by the Scherrer eqnation ... 

Sol-gel silica particles of four different sizes, viz. 0.2 pm, 0.5 pm, 1.0 pm and 1.5 pm were obtained from Geltech Corporation. Particle size analysis on the slurries was carried out using a Honeywell Microtrac UPA 150 particle size analyzer, which utilizes the dynamic light scattering technique. In addition. Transmission Electron Microscopy (TEM) and Scanning Electron Microscopy (SEM) was also used for determining particle size and shape. 

Alumina ptaiticles of different size distributions provided by Sumitomo Chemical Inc. were used for die polishing experiments. A Honeywell Microtrac UPA 150 dynamic light scattering ptarticle size analyzer was used to measure the particle size distribution. Transmission electronic microscopiy and scanning electron microscopy were also used to determine the shapes and size of tiie alumina particles. 

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