## 4 Applications
### Other Applications
These core-interlayer-shell NPs were efficiently dispersed within the PET matrix to form photonic crystals, where the reflection color of the photonic crystals/PET composite was dynamically adjustable during shape programming and recovery processes due to changes in lattice spacing with strain. Smart superhydrophobic SMP surfaces characterized by adjustable wettability have attracted considerable attention due to their wide range of applications. [PERSON] et al. developed a superhydrophobic SMP microconed surface on an AgNW film, which exhibited reversible transitions between pinned and roll-down states via in situ heating induced by voltage, highlighting the potential for adjustable wettability (Figure 30d) [121]. In another study, [PERSON] et al. prepared a light-induced shape recovery of deformed SMP micropillar hexagonal arrays with gold nanorods (AuNRs) [101]. The versatile microconed or micropillared SMP surface finds applications in droplet manipulation, reprogrammable fog harvesting, and more, owing to its robust and reversible morphology transitions. In a recent study, SMP composites were used as information carriers without additional electronic elements. [PERSON] et al. engineered electric- and light-driven information carriers utilizing a carbon nanotubes/ethylene-co-vinyl acetate (CNTs/EVA) SMPC, incorporating Morse code encoding and encryption for information transmission [319]. The study successfully established two modes of information transmission, leveraging the electricity and NIR light-responsive behaviors of the SMP-based composites for dynamic and versatile communication applications. In another study, [PERSON] et al. developed an epoxy-based SMPC embedding various Morse codes within a single specimen through imprint lithography, incorporating four functional components--Fe\({}_{3}\)O\({}_{4}\), CNTs, p-aminodiphenylimide, and neat epoxy polymer--into distinct regions of the epoxy substrate (Figure 30e) [320]. The multi-composite specimen, designed with language code patterns, executed a programmable recovery process, showcasing the capability of the material to follow a predefined recovery route of temporary patterns via a multistage curing and stimulus command procedure. Each Morse code, linked to a specific embossed area, triggered the activation of corresponding sections when subjected to UV light, electromagnetic, or radiofrequency fields, thus illustrating the precise control over the language code recovery process within the shape-memory cycle. [PERSON] et al. synthesized thermo-responsive anti-corrosive SMP NCs by integrating CNFs into a cross-linked polyurethane matrix composed of hydroxyl-terminated polybutadiene (HTPB) and polytetramethylene glycol (PTMG) [175]. These nanocomposites demonstrated superior shape-memory properties and anti-corrosion capabilities in seawater environments, attributed to the hydrogen bonding between adjacent polymer chains [321]. Addressing the significant impact of corrosion on metallic industrial applications, the researchers employed HTPB and PTMG to produce co-polymer-based nanocomposites. In these nanocomposites, hard-phase components chemically cross-linked to form a stable system, while soft-phase components created an elastomeric network enabling reversible shape transitions [322]. The optimal ratio of hard to soft segments, along with the inclusion of CNFs, is critical for achieving high-quality SMPU composites with improved dispersion [323].