42 research outputs found
On the validity of the Einstein’s Relation and the Fick I Law on the nanoscale: On the validity of the Einstein’s Relation and the Fick I Law on thenanoscale
The classical Einstein’s relation for the Brownian migration has a mesoscopic character and it deteriorates when e.g. diffusion in
solids is considered in the nanoscale (i.e. if the diffusion distance is comparable with the atomic spacing). This behaviour is strongly
related to the well-known diffusion paradox, predicting infinitely fast diffusion kinetics at short times (distances). Indeed, according to the Fick I law the gradient is infinite if there is a discontinuity in the density at the beginning (which is the case in typical interdiffusion measurements). In this paper these questions and a possible resolution of the above paradox will be discussed on the basis of results obtained in our Laboratory
Inversion of the direction of photo-induced mass transport in As20Se80 films: Experiment and theory
Composition and Pressure Dependence of the Diffusion Coefficients in Binary Liquid Alloys
On the validity of the Einstein’s Relation and the Fick I Law on the nanoscale: On the validity of the Einstein’s Relation and the Fick I Law on thenanoscale
The classical Einstein’s relation for the Brownian migration has a mesoscopic character and it deteriorates when e.g. diffusion in
solids is considered in the nanoscale (i.e. if the diffusion distance is comparable with the atomic spacing). This behaviour is strongly
related to the well-known diffusion paradox, predicting infinitely fast diffusion kinetics at short times (distances). Indeed, according to the Fick I law the gradient is infinite if there is a discontinuity in the density at the beginning (which is the case in typical interdiffusion measurements). In this paper these questions and a possible resolution of the above paradox will be discussed on the basis of results obtained in our Laboratory
On the validity of the Einstein’s Relation and the Fick I Law on the nanoscale: On the validity of the Einstein’s Relation and the Fick I Law on thenanoscale
The classical Einstein’s relation for the Brownian migration has a mesoscopic character and it deteriorates when e.g. diffusion in
solids is considered in the nanoscale (i.e. if the diffusion distance is comparable with the atomic spacing). This behaviour is strongly
related to the well-known diffusion paradox, predicting infinitely fast diffusion kinetics at short times (distances). Indeed, according to the Fick I law the gradient is infinite if there is a discontinuity in the density at the beginning (which is the case in typical interdiffusion measurements). In this paper these questions and a possible resolution of the above paradox will be discussed on the basis of results obtained in our Laboratory