Platinum particle growth in aqueous phase has been investigated at 20 °C the course of nitrite (NO2−) reduction by H2 reaction. A shift from a monomodal to bimodal size distribution on used catalysts is accompanied with disappearance smallest Pt particles agreement an Ostwald ripening mechanism. two-step process involving consecutive dissolution and re- aggregation form larger suggested accordi...

TEM and XRD techniques were used to study crystal growth characteristics of the fabric-forming phyllosilicates which developed in response to low-grade metamorphism and tectonic imbrication in part of the Southern Uplands thrust terrane. Prograde regional metamorphism, ranging from late diagenesis through the anchizone to the epizone, was accompanied by the development of a slaty cleavage which...

The dynamics of Ostwald ripening is treated by cluster distribution kinetics represented by a population balance equation that also describes growth or dissolution. Unlike simple crystal growth driven by supersaturation, the smaller, more soluble clusters in the distribution dissolve during ripening near equilibrium and vanish when they reach the critical nucleus size. Larger clusters according...

Bitumen as a binder in coating and insulating materials is modified with polymers to improve its performance in service conditions. Almost all polymers are incompatible with bitumen, and at high temperatures due to relatively very low viscosity of the bitumen phase, are separated from it. These lead to a considerable limitation in the use and handling of polymer-modified bitumens. An understand...

A mathematical model for the growth of a single nanocrystal is generalised to deal with an arbitrarily large number crystals. The basic form Stefan problem, describing diffusion monomer over moving domain. Various levels approximation (an analytical solution, ordinary differential equation and N particle model) are compared shown agree well. solution then have excellent agreement experimental d...