Particle monolayers formed under irreversible conditions: jamming coverages and structure |
| |
Authors: | Adamczyk Zbigniew Weroński Paweł Siwek Barbara Zembala Maria |
| |
Affiliation: | (1) Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 1, 30-239 Kraków, Poland |
| |
Abstract: | The random sequential adsorption (RSA) approach was used for modelling irreversible adsorption phenomena of polyatomic particles
at homogeneous interfaces. Particles of spherical and spheroidal shape, characterised by various axis ratio parameter A, were considered. In the latter case, the flat (side-on) and unoriented adsorption was discussed. The sticking probability
(available surface function) was determined for various particle shapes together with “jamming” coverages for clean and precovered
surfaces. The structure of adsorbed particle monolayers (under transient and jammed states) was analysed quantitatively in
terms of the pair correlation functions. Methods of extrapolation of these results to interacting (soft) particle systems
were also discussed. The theoretical predictions were confronted with existing experimental results derived for monodisperse
spherical particles. A good agreement with theory was found both in respect of jamming coverages and the monolayer structure.
These theoretical and experimental studies demonstrated that minor amounts of small particles (nanometer size range) exert
decisive influence on adsorption of larger particles. This phenomenon can be treated as analogous to the surface poisoning
effect occurring in heterogeneous catalytic systems.
This revised version was published online in August 2006 with corrections to the Cover Date. |
| |
Keywords: | adsorption of colloids colloid particle adsorption irreversible adsorption monolayer coverages RSA model |
本文献已被 SpringerLink 等数据库收录! |