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Title

Shape memory cellulose-based photonic reflectors

AuthorsEspinha, André ; Guidetti, Giuia; Serrano, María C. ; Frka-Petesic, Bruno; Gümrah Dumanli, Ahu; Hamad, Wadood Y.; Blanco Montes, Álvaro ; López, Cefe ; Vignolini, Silvia
KeywordsBiomimetic
Cholesteric
Cellulose nanocrystals
Polydiolcitrates
Shape memory
Issue Date23-Nov-2016
PublisherAmerican Chemical Society
CitationACS Applied Materials and Interfaces 8(46): 31935-31940 (2016)
AbstractBiopolymer-based composites enable to combine different functionalities using renewable materials and cost-effective routes. Here we fabricate novel thermoresponsive photonic films combining cellulose nanocrystals (CNCs) with a polydiolcitrate elastomer exhibiting shape memory properties, known as hydroxyl-dominant poly(dodecanediol-co-citrate) (PDDC-HD). Iridescent films of CNCs are first made by evaporation-induced self-assembly, then embedded in the PDDC-HD prepolymer, and finally cured to obtain a cross-linked composite with shape memory properties. The fabricated samples are characterized by polarized optical microscopy, scanning electron microscopy, and thermomechanical cycling. The obtained hybrid material combines both intense structural coloration and shape memory effect. The association of stiff cellulose nanocrystals and soft polydiolcitrate elastomer enhances the overall mechanical properties (increased modulus and reduced brittleness). This hybrid nanocomposite takes advantage of two promising materials and expands their possibilities to cover a wide range of potential applications as multiresponsive devices and sensors. As they perform from room to body temperatures, they could be also good candidates for biomedical applications.
Publisher version (URL)https://doi.org/10.1021/acsami.6b10611
URIhttp://hdl.handle.net/10261/185794
Identifiersdoi: 10.1021/acsami.6b10611
e-issn: 1944-8252
issn: 1944-8244
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