نوع مقاله : پژوهشی
نویسنده
دزفول، دانشگاه صنعتی جندی شاپور دزفول، گروه مهندسی شیمی، کد پستی 18674-64616
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسنده [English]
Hypothesis: Piezoelectric actuators, which can convert electrical energy into mechanical energy, have gained great interest in soft robotic systems, medical instruments, artificial muscles, electronic devices, etc. Nanostructure tailoring via the cooperative effects of creating geometrical confinement, chain orientation, and nanoparticle addition can remarkably enhance piezoelectric properties and actuation performance.
Methods: Preferably oriented polyvinylidene fluoride (PVDF) nanofibers containing a low amount of Cloisite 30B were introduced by electrospinning on a wire-framed rotating drum. The field-emission scanning electron microscopy (FE-SEM) has been used to observe the morphology and diameter distribution of the nanofibers. Transmission electron microscope (TEM) confirmed dispersion of Cloisite 30B nanoparticles inside the nanofibers. Fourier transform infrared spectroscopy (FTIR) observed the crystalline structure of the nanofibers. The mechanical properties were measured using dynamic mechanical thermal analysis (DMTA). Finally, nanofibers were used as the unimorphous cantilever beam to evaluate the piezoelectric performance.
Findings: The synergistic effects of preferential alignment, reduced fiber diameter, and Cloisite 30B platelets caused the tailoring of the polar β crystalline phase in PVDF. The well-oriented PVDF/Cloisite 30B nanofibers exhibited a smooth morphology with an average diameter beneath 100 nm and a β-phase fraction of ~88%. The probable polymer chain-clay platelet interfacial interactions are responsible for a ~84% increase in the elastic modulus of the oriented PVDF nanofibers. Previously, the geometrical constraint (preferential orientation and fiber diameter reduction) had led to a 63% increase in the elastic modulus of pristine and random PVDF nanofibers. The electrospun nanofibers showed the maximum piezoelectric deflection of 11.2 μm in response to the electric field of 2 V/μm when used as a unimorphous cantilever beam, which is higher or comparable to the previously published data in literature. These results indicate that the produced PVDF/Cloisite 30B nanofibers are promising candidates for lightweight, flexible, and nano-dimensional piezoelectric actuators in next-generation multifunctional structures.
کلیدواژهها [English]
)