Partide size distribution

On the other hand, the partide size distribution of the partides prepared by the reactoa-type 2 looks more broad, which may be attributed by the widw gas residence time distribution in the reaction zone. In order to reduce the dispersion of partide size, i.e., im nre time distribution, back mixing should be prevented. 

The substance was found to consist exclusively of silver nanopartides (for partide size distribution see Figure 10.12). Silica nanopartides were frequently found in the product. We attribute this to sputter effects of the glass reactor walls. These sputter effects can easily be reduced by a more sophisticated design of the plasma reactor. 

These minerals have different stacking of the silica and alumina layers, as well as, incorporating metal hydrates of Na, K, Mg, Al, or Fe between the silica and alumina layers. Clay minerals can also be characterized according to their morphological features including crystal habit (i.e., plates, rods, or rolled-up platelets) stacked in either a house of cards or blocklike aggregates giving a partide-size distribution. 

Fig. 7 TEM images of (a) 3 and (b) 7 nm NiO nanopartides, The insets show the histograms of the partide size distributions (upper panels). The lower panel in (a) shows the SAED pattern, The HREM image of a single NiO nanopartide of 6 nm is shown in the lower panel in (b).

In the microwave synthesis of zeolites, a mixture of a precursor and a zeolite support is heated in a microwave oven. The sample is then tested for its catalytic activity and the results compared with those from the sample obtained by the conventional method. Microwave irradiation at the calcination stage led to samples with more uniform partide-size distribution and microstructure and to bimetallic catalysts with different morphology. 

To achieve low stress embedding material, low modulus material such as silicones (dastomers or gels) and polyurethanes are usually used. Soft-domain dastomeric partides are usually incorporated into the hard (high modulus) materials such as epoxies and polyimides to reduce the stress of embedding materials. With the addition of the perfect partide size, distribution, and loading of soft domain particles, low stress epoxy molding compounds have been developed as excellent embedding materials for dectronic applications. 

Figure 4.1 Partide-size distribution of several batches of Waters iiBondapak C,...

In Table 11.1, some of the slurry properties are listed, whith influence plant selection [Tiller Crun, 1977]. Figure 11.1 presorts a broad classification of suitable filtos against tire partide size distribution parameters. Of course, sudi dassifications caimot be viewed as being rigorous in all circumstances, but tire data indicate that pressure filters will be found most commonly in those processes containing dow-sOtling, dow-fihering suspensions. 

The quality of a solid product critically depends on its particle size, partide size distribution, and particle shape. Properties sucdi as dissolution rate, bulk density, flowabdity, ease of formulation, and content uniformity of the final product can be influenced. Therefore, accurate particle size and shape determination is of paramount importance. 

A continuous crystallizer cannot be operated with spontaneous nudeation, as this would lead to instability in the partide size distribution (see Chapter 11 and Figure 11.11). Instead, nuclei are formed continuously by the collision of larger crystals resulting in small particles, which act as nuclei. As crystals of the substance crystallizing are responsible for nudeation, this nudeation is called secondary nudeation. 

Hoffmann, T., Peglow, M., Tsotsas, E., 2010. Dynamic behaviour of partide-size distribution in fluidized bed granulation. Proceeding of the 6th World Congress on Particle Technology, Niimberg. 

The physicochemical mechanism of the polymer growth on catalyst particles is far from dear. As already mentioned, the anionic dispersion polymerization of EO produces a polymer insoluble in polymer diluents. As a result, the catalyst partides transform into polymer partides rapidly, within a few minutes after the start of the reaction. Hie size of the initial catalyst partides is in the 1-50 pm range. Hieir shape is not wdl defined. The relatively broad partide size distribution is due to the formation of a omerates. Hierefore, during the polymerization process, some manufacturers successfully apply ultrasound technique or surface-active compoimds as additives to destroy the a regates and to enhance the catalyst productivity. 

Vemury, S., Kusters, K.A. and Pratsinis, S.E. (1994) Time-lag for attainment of the self-preserving partide-size distribution by coagulation. Journal of Colloid and Interface Science, 165(1), 53-9. 

Thus, the effect that a Co(II)-based CCTA has on the course of the polymerization, and on the product properties of an emulsion polymerization, is governed by the intrinsic activity and the partitioning behavior of the catalyst. Radical desorption from the particle phase to the aqueous phase preceded by chain transfer is the main kinetic event controlling the course of the polymerization. The product properties in terms of the partide size distribution and the aqueous phase solubility of the CCTA are the key parameters controlling the course of the polymerization and the partide size distribution. Two limiting scenarios have been identified in cases of fast CCTA entry and exit, mono-modal MWDs can be obtained and with slow CCTA entry and exit, bimodal MWDs can be obtained one peak can be attributed to the generation by bimolecular termination prodna produced in polymer partides devoid of CCTA, while a transfer-derived peak can be attribnted to polymer partides containing one or more CCTA molecules. ... 

Chen TK, Jan YH (1992) Fracture mechanism of toughened epoxy-resin with bimodal rubber-partide size distribution. J Mater Sd 27 111... 

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