Atomic force microscopy visualization of hard segment alignment in stretched polyurethane nanofibers prepared by electrospinning.Molecular-level orientation within nanofibers has been attracting attention as a tool for controlling and designing highly functional nanofibers.  In this study, we used atomic force microscopy to visualize the phase separation between soft and hard segments on a polyurethane (PU) nanofiber surface prepared by electrospinning. 
Atomic force microscopy