Image Processing / Scanning Electron Microscopy / Nanocrystalline Material / Pore Size / Zinc / Polyethylene Glycol / Surface Area / X ray diffraction / Polyvinyl alcohol / Scanning Electron Microscope / Nanostructured Material / Sodium Hydroxide / Polyethylene Glycol / Surface Area / X ray diffraction / Polyvinyl alcohol / Scanning Electron Microscope / Nanostructured Material / Sodium Hydroxide