title: Shape Memory Cellulose-Based Photonic Reflectors.
abstract: Biopolymer-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.
authors: Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Calle Sor Juana Inés de la Cruz , 3, Cantoblanco, 28049 Madrid, Spain.
authors: André
authors: A
authors: Espinha
authors: Department of Chemistry, University of Cambridge , Lensfield Road, Cambridge CB2 1EW, U.K.
authors: Giulia
authors: G
authors: Guidetti
authors: Servicio de Salud de Castilla La Mancha, Hospital Nacional de Parapléjicos , Finca La Peraleda s/n, 45071 Toledo, Spain.
authors: María C
authors: MC
authors: Serrano
authors: Department of Chemistry, University of Cambridge , Lensfield Road, Cambridge CB2 1EW, U.K.
authors: Bruno
authors: B
authors: Frka-Petesic
authors: Department of Chemistry, University of Cambridge , Lensfield Road, Cambridge CB2 1EW, U.K.
authors: Ahu Gümrah
authors: AG
authors: Dumanli
authors: FPInnovations, 2665 East Mall, Vancouver, BC, Canada V6T 1Z4.
authors: Wadood Y
authors: WY
authors: Hamad
authors: Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Calle Sor Juana Inés de la Cruz , 3, Cantoblanco, 28049 Madrid, Spain.
authors: Álvaro
authors: Á
authors: Blanco
authors: Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Calle Sor Juana Inés de la Cruz , 3, Cantoblanco, 28049 Madrid, Spain.
authors: Cefe
authors: C
authors: López
authors: Department of Chemistry, University of Cambridge , Lensfield Road, Cambridge CB2 1EW, U.K.
authors: Silvia
authors: S
authors: Vignolini
keywords: biomimetic; cellulose nanocrystals; cholesteric; polydiolcitrates; shape memory