Similar particle size distribution

Uniform mixing of powdered materials occurs if they have similar particle size distributions and particle shapes. Spherical particles mix least well while plate and fiber shapes also do not mix well because they tend to clump. The more cohesive the material, the more difficult it is to mix that material with other materials. Similarly, cohesiveness between drug and excipient or among excipients may hinder the... 

An important class of self-similar particle size distributions n(ir, /) can be represented by an equation of the form (Chapters 1 and 7) ... 

For self-similar particle size distributions, the average particle size can be determined directly by measuring the extinction. Total scattering in the Rayleigh range is... 

Clearly, depends on the volume fraction of the dispersion, as well as the particle size distribution (which determines the number of contact points in a floe). Therefore, for quantitative comparison between various systems, it must be ensured that the volume fraction of the disperse particles is the same, and that the dispersions have very similar particle size distributions. also depends on the strength of the flocculated structure - that is, the energy of attraction between the droplets - and this in turn depends on whether the flocculation is in the primary or secondary minimum. Flocculation in the primary minimum is associated with a large attractive energy, and this leads to higher values of when compared to values obtained for secondary minimum flocculation (weak flocculation). For a weakly flocculated dispersion, as is the case for the secondary minimum flocculation of an electrostatically stabilised system, the deeper the secondary minimum the higher the value of (at any given volume fraction and particle size distribution of the dispersion). 

The observed microscopic structure or particular interparticle associations were found to correlate with bicarbonate ion concentration, although, as mentioned earlier, small concentrations of organic surfactants released by the caustic extraction process (that would also correlate with bicarbonate concentration) cannot be ruled out. Figure 25 shows MFT created without caustic [the other six lease owners (OSLO) process]. No structure comparable with that observed in the MFT from the Clark extraction process is evident in this sample despite its similar particle size distribution and weight percent solids. Kaolinite clays in deionized... 

By comparing these results with our previous analysis of the Smoluchowski equation [3], it is also apparent that sintering by migration of crystallites or of adatoms result in similar particle size distributions. In principle, this means that it is not possible to determine whether a single mechanism is responsible of sintering based only on the particle size distribution observed. 

Artificial replenishment ot the shore by building beach tills is used either if it is economically preferable or if artificial barriers fail to defend the shore adequately from erosion. In fact, beach nourishment represents the only form of coastal protection that does not adversely affect other sectors of the coast. Unfortunately, it is often difficult to predict how frequently a beach should be renourished. Ideally, the beach fill used for renourishment should have a similar particle size distribution as the natural beach material. 

In contrast to the material seen in the previous figures. Fig. 5 shows untransformed preceramic particles which were collected on a cold substrate. In this TEM, the preceramic particles are supported on a carbon film. This micrograph shows the transparency of the individual particles and the dark contrast that arises firom particle overlapping. Electron diffiaction reveals the particles to be entirely amorphous. Particle size distribution analysis using TEM, indicates that the preceramic particles have a mean diameter of 65 nm. The ceramic powder, obtained by subsequent thermal treatment has a similar particle size distribution. 

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