Size distribution mono-modal

FIGURE 2.14 Mixing of two size distribution-mono modal intersecting distributions (a) linearized log-normal plot, (b) relative % versus size. Taken fiom Figures 4.16 and 4.17 in Allen [1]. 

AFM and SEM micrographs of obtained silver nanoparticles are shown in Figures 12.4, 12.5, and 12.6. Based on the resulting micrographs, a spherical shape of the obtained nanoparticles, which are generally characterized by a mono-modal size distribution, is noted. 

Monometallic Pd/yAl203 catalysts prepared by procedure PdN show mono-modal particle size distributions after reduction at 673 K, with average diameters ranging between 23 (PdN 0.5%) and 60 A (PdN 5%). 

The use of different amounts of ammonium carbonate led to solids with mono-modal or bi-modal pore size distribution. Figure 1 shows the results obtained from the preparations using 0.0, 2.88 and 7.5 g. of ammonium carbonate during the preparation of the Ti-Al-(0.5) mixed oxide using the method A ( experiments 1.1, 1.2 and 1.3 in table 1). 

The results from the figure 1 show that increasing the amount of AC, changes the shape of the pore size distribution curve from mono to bi-modal. This change can be explained by a change in the structure of the mixed oxide due to the formation of the NH4 -C03 -A1 interaction compound, evidenced by the IR observations. 

Mono or bi-modal pore size distributions can be achieved depending on the (NH4)2C03 concentration and the pH used during the preparation of the Ti-Al mixed oxide. 

Any suitable feed sohds material may be used for the testing but it has to be one with a mono-modal particle size distribution that approximately follows the log-normal law. This requirement is not too hmiting because the test material is a matter of choice. 

In Fig. 11 the situation is different. The distribution functions shown are only mono-modal and were obtained for a higher surfactant concentration (rm = 7). This clearly indicates that the large BCP aggregates were decomposed and that smaller mixed micelles with a narrow size distribution were obtained. This observation is similar to the effect observed upon addition of SDS and C12TAB [29, 30] and suggests a behavior of the 7 h value of the polymer micelles as depicted in Fig. 6. The hydrodynamic radius computed from the data in Fig. 11 is 13.4 nm. This value is... 

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. ... 

In an examination of glass beads sieved into five fractions in the size range 70 to 400 mm it was found that the accuracy of the determined medians was good. The distribution widths and the resolution of binary mixtures were compared with image analysis. These showed some discrepancies for both mono-and bi-modal distributions with undersizing in both cases [166]. 

Figure 3.8. Computer generated 3D models with cross-sections for randomly distributed particles/voids with a volume fraction of 0.15 (a) mono-sized particles/voids of 5.35 in diameter, and a minimum inter-particle/void distance of 1.5 (b) mono-sized particles/voids of 5.3 in diameter, and a minimum inter-particle/void distance of zero (c) log-normally sized particles/voids with a mean of 5.57 and a standard deviation of 1.13 (d) log-normaUy sized particles/voids with a mean of 5.91 and a standard deviation of 2.46 and (e) log-normally sized bi-modal particles/voids with a similar mean particle/void size of 5.74 but different standard deviations of 1.11 and 2.47 and respectively volume fractions of 0.054 and 0.096. The location of each cross-section is shown on 3D model. The scale bar on the cross section represents 50 [361...

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