We investigate a phase-field-crystal model for homogeneous nucleation. Instead of obtaining the time evolution of a density field towards equilibrium, we use a string method to identify saddle points in phase space. The saddle points allow us to obtain the nucleation barrier and the critical nucleus. The advantage of using the phase-field-crystal model for this task is that it can be used to resolve atomistic effects. The results obtained indicate different properties of the critical nucleus as compared with those for bulk crystals and provide a detailed description of the nucleation process.
The ferroelectric film of polivinylidene difluoride (PVDF) is used to construct a low cost pressure sensor. The PVDF film has an extensive dynamic range and high bandwidth (0.001 to lo9 Hz). With this sensor me are able to measure pressures of low magnitude like the intraocular pressure.
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