Nanoparticle elasticity coefficient

Generally, mean size and size distribution of nanoparticles are evaluated by quasi-elastic light scattering also named photocorrelation spectroscopy. This method is based on the evaluation of the translation diffusion coefficient, D, characterizing the Brownian motion of the nanoparticles. The nanoparticle hydro-dynamic diameter, is then deduced from this parameter from the Stokes Einstein law. 

The properties of a nanocomposite are determined by the stmcture and properties of the nanoelements, which form it. One of the main tasks in making nanocomposites is building the dependence of the stmcture and shape of the nanoelements forming the basis of the composite on their sizes. This is because with an increase or a decrease in the specific size of nanoelements (nanofibers, nanotubes, nanoparticles, and so on), their physical— mechanical properties such as coefficient of elasticity, strength, deformation parameter, and so on, are varying over one order [1-5]. 

As it has been discussed earlier, the nanocomposite polymeric materials may be used for the development of various acoustoelectronic devices based on piezoelectric plates and also for the development of the matching devices for launching/receiving acoustic waves in low-impedance media. For the theoretical analysis of such structures, one must know the information about elastic and viscous properties of nanocomposite polymeric materials. In this connection, this section contains the results of the experimental investigation of the elasticity and viscosity coefficients of the nanocomposite materials based on a low-density polyethylene with the embedded Fe and Fe203 nanoparticles of various concentrations. 

We demonstrate the results of the investigation of the infiuence of the nanoparticle material on the longitudinal coefficients of elasticity and viscosity of the nanocomposite films. The values of the mechanical parameters of the nanoparticle materials and nanocomposites with the same percentage content of nanopartides (10 and 20%) are presented in Table 7.5. 

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