Figure 35.

(A) Series of photographs showing the shape-memory recovery process of the composite nanofibers containing PCL and multiwalled carbon nanotubes coated with Fe₃O₄ nanoparticles in a water bath at 46 °C and in an alternating magnetic field with a frequency of 20 kHz and a field strength of 6.8 kA/m. (B) Demonstration of the shape-memory effect of poly(D,L-lactide-co-trimethylene carbonate) nanofibers recovering from a temporary shape of straight strip to take the permanent spiral shape within about 6 s upon heating to 39 °C in a water bath. The inset gives an SEM image showing the morphology of the nanofibers. (C) Shape-memory behavior of a sleeve constructed from shape-memory nanofibers as revealed by photographs and SEM images of the sleeves before fixing, after fixing, and after recovery (ruled markings on the images: mm). (A) Reprinted with permission from ref 573. Copyright 2012 Elsevier. (B) Reprinted with permission from ref 577. Copyright 2014 American Chemical Society. (C) Reprinted with permission from ref 578. Copyright 2016 Elsevier.