2,888 research outputs found
On the characteristics of a class of Gaussian processes within the white noise space setting
Using the white noise space framework, we define a class of stochastic
processes which include as a particular case the fractional Brownian motion and
its derivative. The covariance functions of these processes are of a special
form, studied by Schoenberg, von Neumann and Krein
Dynamic Surface Tension of Aqueous Solutions of Ionic Surfactants: Role of Electrostatics
The adsorption kinetics of the cationic surfactant dodecyltrimethylammonium
bromide at the air-water interface has been studied by the maximum bubble
pressure method at concentrations below the critical micellar concentration. At
short times, the adsorption is diffusion-limited. At longer times, the surface
tension shows an intermediate plateau and can no longer be accounted for by a
diffusion limited process. Instead, adsorption appears kinetically controlled
and slowed down by an adsorption barrier. A Poisson-Boltzmann theory for the
electrostatic repulsion from the surface does not fully account for the
observed potential barrier. The possibility of a surface phase transition is
expected from the fitted isotherms but has not been observed by Brewster angle
microscopy.Comment: 13 pages, 5 figure
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