Nanoparticle material density, effect

Effect of the Nanoparticle Material Density on the Acoustic Parameters 179... 

An analysis of the data in Table 7.5 shows that, as the nanoparticle material density increases, the average of the longitudinal coefficient of elastidty of nanocomposites decrease, while the effective viscosity coefficients remain virtually unchanged. 

Dressing surfactant density Magnetic core density Effective relaxation time of magnetization Brownian relaxation time Neelian relaxation time Hydrodynamic volume fraction of the surfactant-dressed nanoparticles Suspension volume fraction of magnetic material embedded in the nanoparticles y-phase-side values of the variable eg on K-phase-side values of the variable eg on Spatial fluctuation of the bounded piecewise continuous scalar field cp around the intrinsic average in u... 

Although no quantum confinement should occur in the electronic energy level structure of lanthanides in nanoparticles because of the localized 4f electronic states, the optical spectrum and luminescence dynamics of an impurity ion in dielectric nanoparticles can be significantly modified through electron-phonon interaction. Confinement effects on electron-phonon interaction are primarily due to the effect that the phonon density of states (PDOS) in a nanocrystal is discrete and therefore the low-energy acoustic phonon modes are cut off. As a consequence of the PDOS modification, luminescence dynamics of optical centers in nanoparticles, particularly, the nonradiative relaxation of ions from the electronically excited states, are expected to behave differently from that in bulk materials. 

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