NDLI: Equation of state of surface-adsorbing colloids

Content Provider	Royal Society of Chemistry (RSC)
Author	Stoyanov, Simeon D. Groot, Robert D.
Copyright Year	2010
Abstract	We have developed a simulation model to describe particle adsorption to and desorption from liquid interfaces. Using this model we formulate a closed interfacial equation of state for repulsive elastic spheres. The effect of a long-range attractive interaction is introduced by perturbation theory, and the effect of a short-range attraction is studied using direct simulation. Based on our model predictions we conclude that for polymeric particles the surface pressure cannot be modelled directly by inert particles that interact via some effective potential. Internal degrees of freedom within gel particles are all-important. Consequently, the surface pressure of a fully packed layer is not proportional to kT/d2, where d is the particle diameter; but proportional to kT/dm2, where dm is the size of the molecular units that make up the particle. This increases the surface pressure and modulus by some four orders of magnitude. For short range interaction we study the dynamic behaviour, and find fractal-like structures at low concentrations. At intermediate coverage an irregular structure is formed that resembles a spinodal system. This system freezes, which arrests the spinodal structure. At high surface coverage the simulations show poly-crystalline domains. For dilute systems, the strength of the surface layers is determined by simulated compression and expansion. We find a power law for the surface pressure (Π ∝ Γ10±0.5), which is related to the (fractal) structure of the adsorbed network. The power law is consistent with surface percolation.
Starting Page	1682
Ending Page	1692
Page Count	11
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	6
Issue Number	8
Journal	Soft Matter
DOI	10.1039/b925353j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Perturbation theory Fractal Adsorption Interaction Power law
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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