Migration on surfaces

Kouvroukoglou, S., Dee, K. C., Bizios, R., Mclntire, L. V., and Zygourakis, K. (2000), Endothelial cell migration on surfaces modified with immobilized adhesive peptides, Biomaterials 21(17) 1725-1733. 

The bad combination of flame moderates of PP provides their intensive migration on surface. It leads to reduction of effectivity of fire-resistance. It is known that reduction capacity of polymer matrix and creation more firm structure of PP decelerate the process of untipiren migration. 

Proceedings of the 7th International Symposium, Cancun, Mexico, October 5-8,1997 edited by C.H. Bartholomew and G.A. Fuentes Volume 112 Spillover and Migration of Surface Species on Catalysts. 

This study, in conjunction with that discussed in 12.2.1.2, show that when using aqueous electrolytes or Nafion saturated with H20, the induction of NEMCA on finely dispersed noble metal catalysts is rather straightforward. The role of the electronically conducting porous C support is only to conduct electrons and to support the finely dispersed catalyst. The promoting species can reach the active catalyst via the electrolyte or via the aqueous film without having to migrate on the surface of the support, as is the case when using ceramic solid electrolytes. 

The reason is that the backspillover ions desorb to the gas phase directly from the three-phase-boundaries or react directly at the three-phase-boundaries (electrocatalysis, A=l) before they can migrate on the gas-exposed electrode surface and promote the catalytic reaction. The limits of NEMCA are set by the limits of stability of the effective double layer at the metal/gas interface. 

It was obtained by a pre-treatment of fresh impregnated HMOR in flowing air, up to 773 K. In these conditions, as detected by TEM, EDS and UV-visible spectroscopy (not shown, [12]), a fraction of Co2+ species, exchanged in the pores of HMOR, migrates on the outside of the zeolite grain, to form Co304 on the external surface of the HMOR grain. 

A number of important processes depend on the permanence of particle attachment to surfaces by Van der Waal forces in the presence of flowing fluids. These include enzyme fixation, particle filtration, oil production, nuclear reaction excursions, migration of surface contaminants, etc. The release of particles attached to a surface plays an important role in these processes. 

Molecules migrate on the surface after rains, following drainage patterns. 

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