Chemistry Reference
In-Depth Information
Multiple scattering of surface waves by two-dimensional
colloid systems
Boris A. Noskov
1
and Giuseppe Loglio
2
1
St.Petersburg State University, Department of Colloid Chemistry,
St. Petersburg - Staryj Petergof, Russia
2
Universita degli Studi di Firenze, Dipartimento di Chimica Organica,
Sesto Fiorentino, Firenze, Italy
Abstract.
Propagation of capillary waves along the surface of water cov-
ered by a homogeneous insoluble film has been a subject of numerous ex-
perimental and theoretical studies. However, it has been shown only re-
cently that real surface films contain two-dimensional aggregates, which
influence the characteristics of surface waves. The problem of multiple
scattering of surface waves by two dimensional viscoelastic particles is
considered briefly below. The results can be compared with the experi-
mental data for condensed films with two-dimensional bubbles of gaseous
phase.
1 Introduction
Insoluble monolayers on an aqueous substrate have been investigated by
means of the capillary wave method for many years. Lucassen and Hansen
(1966) in their pioneering work neglected the surface viscosity and con-
sidered only pure elastic films. Subsequent studies showed that the surface
elasticity of real surface films is a complex quantity, and both the equili-
brium surface properties and the kinetic coefficients of relaxation pro-
cesses in the films influence the characteristics of surface waves. However,
it has been discovered recently that the real situation is even more compli-
cated and the macroscopic structure of surface films influences the de-
pendency of the damping coefficient of capillary waves on the area per
molecule (Miyano and Tamada 1992, 1993, Noskov and Zubkova 1995,
Noskov et al. 1997, Chou and Nelson 1994, Chou et al. 1995, Noskov
1991, 1998, Hühnerfuss et al. this issue). Some peculiarities of the experi-
mental data can be explained, if one takes into account the capillary wave
scattering by two-dimensional particles (Noskov et al. 1997).
