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A novel approach to fabricating a stable superhydrophobic PC using a phase separation method and selecting a solvent/non-solvent without requiring any surface chemical modification and high chemical stability was proposed in this paper. A systematic study of the dependence of surface morphology on the acetone/DMF solvent mixture treatment was conducted. Resulting surfaces demonstrated that the water CA of the superhydrophobic PC surface was 160±2°. FESEM showed that the surface structure comprised branches or petals outside the 'plant seabeds', which have microflowers that offer nanoscaled roughness on the surface with a hierarchical micro-/nano-binary formation. All samples were maintained at 10-40°C in ambient atmosphere for 5 h to 4 months to test the stability of the surface. The CAs were measured for each condition with very little change observed. In addition, the PC surface remained superhydrophobic without any contamination after water was sprayed on it.

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Piezoelectric nanogenerator based on a composite structure formed of Polyvinylidene Fluoride (PVDF) as the matrix and Barium Titanate BaTiO3 nanospherical after dissolving them in a solvent of Dimethyl Sulfoxide DMSO/Acetone in (1/3 v/v) then spanning it’s homogeneous solution on Aluminum foil. structural and morphology analyses that of fabricated nanofibers characterized by X-ray diffraction, Scanning Electron Microscope and the electrical output of piezoelectric membrane devices was measured by using oscilloscope. The electrical output of different samples were measured for the pure powder PVDF and for composite PVDF& BaTiO3. The highest PVDF composite piezoelectrically generated voltage for samples with BaTiO3 (20%PVDF & 25% BT) wt. %. where improved to 6 V in general the addition of BT Nc increases the piezoelectric response of electrospun PVDFnanofibers.