Structure of particles

Lints, M. C., and Glicksman, L. R., Structure of Particle Clusters Near Wall of a Circulating Fluidized Bed, AIChE Symp. Series, 89(296) 35 47 (1993)... 

The facts that we have explicitly included the intraparticle interference function P[Q) in the analysis of scattering intensities and that it is accessible experimentally allow us to characterize colloidal dispersions structurally in more detail than we have been able to so far. In order to understand this, we need to understand clearly what we mean by small or large values of 6 or s and how they affect the behavior of P(6). This will also help us to understand how (and why) it is possible to combine light scattering with x-ray or neutron scattering to study structures of particles and their aggregates. 

An example of a very low diffusion rate of D = 0.1 is shown in Fig. 9.13. For this case the phase transition at y vanishes. Because of the very small reactivity of the H atoms large cluster structures of particles are formed. This allows the simultaneous appearance of H and N atoms on the surface. 

The difference between the fb(pH=o) values of particulate and film photoelectrode Ti02 can, for example, be explained by the different crystal structures of particles... 

We noted that polymer concentration in the liquid solution affects the nucleation process. From dilute solutions an aggregate structure of particles fused together is produced. 

The process and properties of PS/MWCNT particles prepared by in-situ suspension polymerization are presented in (21). Here, however, the presence of CNT material coming into or out from spheres or adsorbed on their surfaces was not spotted on SEM images, although some differences in the size and the structure of particles can be identified between pure PS and PS/MWCNT composite. 

Figure 2.1 An IDP composed of very small <0.2 p.m subunits. The IDPs show the fluffy structure of particles that is expected for dust agglomerates in protoplanetary accretion disks. The IDPs are suspected to be composed partly from particles of interstellar origin. A small fraction of the subunits can be identified as presolar dust grains. (Courtesy of NASA, http //stardust.jpl.nasa.gov/science/sci2.html.)...

Keywords titanic powders, diffusion of hydrogen and oxygen, oxides, hydrides in titanic powders, products of corrosion, structure of particles. 

White WB (2005) The structure of particles and the structure of crystals, information from vibrational spectroscopy. J Ceramic Process Res 6 1-9... 

TEM examination of the deformed sample having 15 wt.% of large particles showed numerous crazes emanating from the particles and forming a complicated pattern of crazes. The particles were found to be considerably distorted by the large numbers of crazes around them. Crazes were also seen in the TEM analysis in the sample containing 5 wt. % of large particles. Here, however, there were fewer crazes and the structure of particles was not as distorted. 

Simulation can also be applied to longer length-scale phenomena. Examples include attempts to model the structural and mechanical properties of catalyst pellets, the mesopore structure of particle aggregates and phenomenological studies of crystallization. Here I mention just two examples, studies of crystallite morphology and quantitation of the effect of pore blockages on effective sorption capacities. 

Further exploration of strongly Interconnected pore networks with closed loops as models for the internal structure of particles, were presented by Beeckman [ref. 3D] and Harin et al [ref 31] and Mann et al. [ref. 40] Beeckman derived general analytical solutions for three-dimensional networks which could be extended to account for catalyst deactivation. 

---